releaser: Bump versions for release of 0.155.1

[ci skip]

.circleci/config.yml

@@ -4,7 +4,7 @@ parameters:
 defaults: &defaults
   resource_class: large
   docker:
-      - image: bepsays/ci-hugoreleaser:1.22301.20401
+      - image: bepsays/ci-hugoreleaser:1.22500.20400
 environment: &buildenv
       GOMODCACHE: /root/project/gomodcache
 version: 2
@@ -58,7 +58,7 @@ jobs:
     environment:
         <<: [*buildenv]
     docker:
-    - image: bepsays/ci-hugoreleaser-linux-arm64:1.22301.20401
+    - image: bepsays/ci-hugoreleaser-linux-arm64:1.22500.20400
     steps:
       - *restore-cache
       - &attach-workspace

.gemini/config.yaml

@@ -0,0 +1,13 @@
+have_fun: false
+memory_config:
+  disabled: false
+code_review:
+  disable: false
+  comment_severity_threshold: HIGH
+  max_review_comments: -1
+  pull_request_opened:
+    help: true
+    summary: false
+    code_review: false
+    include_drafts: false
+ignore_patterns: []

.github/pull_request_template.md

@@ -0,0 +1,10 @@
+🛑 Before submitting this PR
+
+All PRs must be linked to an Issue in this repository, and that Issue must be approved by a project maintainer:
+
+- For a bug, approval means that the "needs triage" label is removed.
+- For a proposal, approval means that the "proposal" label is replaced by an "enhancement" label.
+
+PRs without a linked, approved Issue will be closed immediately.
+
+Please review the contribution guide (CONTRIBUTING.md) to understand commit message guidelines and AI assistance disclosures.

.github/workflows/aiwatchdog.yml

@@ -0,0 +1,22 @@
+name: AI Detection
+on:
+  # Use pull_request_target instead of pull_request (we need the secrets.OPENAI_API_KEY to be available for forks)
+  pull_request_target:
+    types: [opened, ready_for_review]
+permissions:
+  contents: read
+  pull-requests: write
+jobs:
+  detect-ai:
+    runs-on: ubuntu-latest
+    if: ${{ !github.event.pull_request.draft }}
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      - name: AI Watchdog
+        uses: bep/ai-watchdog@995475dd81767f8035dc2c943e9230918d06caca # temporary fork (probably)
+        with:
+          openai-api-key: ${{ secrets.OPENAI_API_KEY }}
+          pr-label: AI Suspect
+          fail-when-confident: false
+          # CSV list.
+          pr-user-logins-skip: dependabot[bot],bep,jmooring

.github/workflows/image.yml

@@ -16,20 +16,20 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@318604b99e75e41977312d83839a89be02ca4893 # v5.9.0
         with:
           images: ${{ env.REGISTRY_IMAGE }}
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@988b5a0280414f521da01fcc63a27aeeb4b104db # v3.6.1
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
       - name: Login to GHCR
         # Login is only needed when the image is pushed
-        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3.3.0
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -37,7 +37,7 @@ jobs:
 
       - name: Build and push
         id: build
-        uses: docker/build-push-action@16ebe778df0e7752d2cfcbd924afdbbd89c1a755 # v6.6.1
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
         with:
           context: .
           provenance: mode=max
@@ -46,3 +46,4 @@ jobs:
           platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          build-args: HUGO_BUILD_TAGS=extended,withdeploy

.github/workflows/stale.yml

@@ -24,7 +24,7 @@ jobs:
             This pull request has been automatically locked since there
             has not been any recent activity after it was closed.
             Please open a new issue for related bugs.
-      - uses: actions/stale@28ca1036281a5e5922ead5184a1bbf96e5fc984e # v9.0.0
+      - uses: actions/stale@5f858e3efba33a5ca4407a664cc011ad407f2008 # v10.1.0
         with:
           operations-per-run: 999
           days-before-issue-stale: 365
@@ -43,7 +43,7 @@ jobs:
           stale-pr-message: This PR has been automatically marked as stale because it has not had
             recent activity. The resources of the Hugo team are limited, and so we are asking for your help.
 
-            Please check https://github.com/gohugoio/hugo/blob/master/CONTRIBUTING.md#code-contribution and verify that this code contribution fits with the description. If yes, tell is in a comment.
+            Please check https://github.com/gohugoio/hugo/blob/master/CONTRIBUTING.md#code-contribution and verify that this code contribution fits with the description. If yes, tell us in a comment.
 
             This PR will automatically be closed in the near future if no further activity occurs. Thank you for all your contributions.
           stale-issue-label: 'Stale'

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.22.x, 1.23.x]
+        go-version: [1.24.x, 1.25.x]
         os: [ubuntu-latest, windows-latest] # macos disabled for now because of disk space issues.
     runs-on: ${{ matrix.os }}
     steps:
@@ -24,9 +24,7 @@ jobs:
         name: Free Disk Space (Ubuntu)
         uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be # v1.3.1
         with:
-          # this might remove tools that are actually needed,
-          # if set to "true" but frees about 6 GB
-          tool-cache: false
+          tool-cache: true
           android: true
           dotnet: true
           haskell: true
@@ -34,9 +32,9 @@ jobs:
           docker-images: true
           swap-storage: true
       - name: Checkout code
-        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
       - name: Install Go
-        uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
+        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
         with:
           go-version: ${{ matrix.go-version }}
           check-latest: true
@@ -45,18 +43,21 @@ jobs:
             **/go.sum
             **/go.mod
       - name: Install Ruby
-        uses: ruby/setup-ruby@a6e6f86333f0a2523ece813039b8b4be04560854 # v1.190.0
+        uses: ruby/setup-ruby@8aeb6ff8030dd539317f8e1769a044873b56ea71 # v1.268.0
         with:
-          ruby-version: "2.7"
-          bundler-cache: true #
+          ruby-version: "3.4.5"
+      - name: Install Ruby gems
+        run: |
+          gem install asciidoctor -v "2.0.26"
+          gem install asciidoctor-diagram -v "3.1.0"
+      - name: Install GoAT
+        run: go install github.com/blampe/goat/cmd/goat@177de93b192b8ffae608e5d9ec421cc99bf68402
       - name: Install Python
-        uses: actions/setup-python@39cd14951b08e74b54015e9e001cdefcf80e669f # v5.1.1
+        uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0
         with:
           python-version: "3.x"
       - name: Install Mage
         run: go install github.com/magefile/mage@v1.15.0
-      - name: Install asciidoctor
-        uses: reitzig/actions-asciidoctor@c642db5eedd1d729bb8c92034770d0b2f769eda6 # v2.0.2
       - name: Install docutils
         run: |
           pip install docutils
@@ -105,7 +106,10 @@ jobs:
         run: go install honnef.co/go/tools/cmd/staticcheck@latest
       - if: matrix.os == 'ubuntu-latest'
         name: Run staticcheck
-        run: staticcheck ./...
+        run: |
+          export STATICCHECK_CACHE="${{ runner.temp }}/staticcheck"
+          staticcheck ./...
+          rm -rf ${{ runner.temp }}/staticcheck
       - if: matrix.os != 'windows-latest'
         name: Check
         run: |
@@ -117,16 +121,14 @@ jobs:
         # See issue #11052. We limit the build to regular test (no -race flag) on Windows for now.
         name: Test
         run: |
-          mage -v test;
+          mage -v test
         env:
           HUGO_BUILD_TAGS: extended,withdeploy
-      - name: Build tags
-        run: |
-          go install -tags extended
       - if: matrix.os == 'ubuntu-latest'
         name: Build for dragonfly
         run: |
           go install
+          go clean -i -cache
         env:
           GOARCH: amd64
           GOOS: dragonfly

.gitignore

@@ -3,4 +3,5 @@
 imports.*
 dist/
 public/
-.DS_Store 
+.DS_Store 
+cache/filecache/_gen/

.prettierignore

@@ -0,0 +1 @@
+tpl/tplimpl/embedded/templates/**

AGENTS.md

@@ -0,0 +1,14 @@
+* Brevity is good.
+* Assume that the maintainers and readers of the code you write are Go experts:
+   * Don't use comments to explain the obvious.
+   * Use self-explanatory variable and function names.
+   * Use short variable names when the context is clear.
+* If you need to add temporary debug printing, use `hdebug.Printf`.[^1]
+* Never export symbols that's not needed outside of the package.
+* Avoid global state at (almost) all cost.
+* This is a project with a long history; assume that a similiar problem has been solved before, look hard for helper functions before creating new ones.
+* Use `./check.sh ./somepackage/...` when iterating.
+* Use `./check.sh` when you're done.
+
+
+[^1]: CI build fail if you forget to remove the debug printing.

CLAUDE.md

@@ -0,0 +1 @@
+@AGENTS.md

CONTRIBUTING.md

@@ -1,4 +1,4 @@
->**Note:** We would apprecitate if you hold on with any big refactorings (like renaming deprecated Go packages), mainly because of potential for extra merge work for future coming in in the near future.
+>**Note:** We would appreciate if you hold on with any big refactoring (like renaming deprecated Go packages), mainly because of potential for extra merge work for future coming in in the near future.
 
 # Contributing to Hugo
 
@@ -19,6 +19,7 @@ The Hugo community and maintainers are [very active](https://github.com/gohugoio
 * [Reporting Issues](#reporting-issues)
 * [Submitting Patches](#submitting-patches)
   * [Code Contribution Guidelines](#code-contribution-guidelines)
+  * [AI Assistance Notice](#ai-assistance-notice)
   * [Git Commit Message Guidelines](#git-commit-message-guidelines)
   * [Fetching the Sources From GitHub](#fetching-the-sources-from-github)
   * [Building Hugo with Your Changes](#building-hugo-with-your-changes)
@@ -54,7 +55,7 @@ If it is of some complexity, the contributor is expected to maintain and support
 
 Any non-trivial code change needs to update an open [issue](https://github.com/gohugoio/hugo/issues). A non-trivial code change without an issue reference with one of the labels `bug` or `enhancement` will not be merged.
 
-Note that we do not accept new features that require [CGO](https://github.com/golang/go/wiki/cgo).
+Note that we do not accept new features that require [CGO](https://go.dev/wiki/cgo).
 We have one exception to this rule which is LibSASS.
 
 **Bug fixes are, of course, always welcome.**
@@ -76,9 +77,19 @@ To make the contribution process as seamless as possible, we ask for the followi
     * Run `go fmt`.
     * Add documentation if you are adding new features or changing functionality.  The docs site lives in `/docs`.
     * Squash your commits into a single commit. `git rebase -i`. It’s okay to force update your pull request with `git push -f`.
-    * Ensure that `mage check` succeeds. [Travis CI](https://travis-ci.org/gohugoio/hugo) (Windows, Linux and macOS) will fail the build if `mage check` fails.
+    * Ensure that `./check.sh` succeeds. Note that some tests are skipped when running locally, some because they are slow. To run these locally,  do `CI_LOCAL=true ./check.sh ./somepackage/...`.
     * Follow the **Git Commit Message Guidelines** below.
 
+## AI Assistance Notice
+
+If a substantial part of your contribution is autogenerated with AI, **this must be disclosed in the pull request**, along with the extent to which AI assistance was used.
+
+An example disclosure:
+
+> This PR was written primarily by Claude Code.
+
+When using AI assistance, we expect contributors to understand the code that is produced and be able to answer critical questions about it.
+
 ### Git Commit Message Guidelines
 
 This [blog article](https://cbea.ms/git-commit/) is a good resource for learning how to write good commit messages,
@@ -93,6 +104,7 @@ Most title/subjects should have a lower-cased prefix with a colon and one whites
 * If this commit touches many packages without a common functional topic, prefix with `all:` (e.g. `all: Reformat Go code`)
 * If this is a documentation update, prefix with `docs:`.
 * If nothing of the above applies, just leave the prefix out.
+* Note that the above excludes nouns seen in other repositories, e.g. "chore:".
 
 Also, if your commit references one or more GitHub issues, always end your commit message body with *See #1234* or *Fixes #1234*.
 Replace *1234* with the GitHub issue ID. The last example will close the issue when the commit is merged into *master*.

Dockerfile

@@ -2,8 +2,8 @@
 # Twitter:      https://twitter.com/gohugoio
 # Website:      https://gohugo.io/
 
-ARG GO_VERSION="1.23.2"
-ARG ALPINE_VERSION="3.20"
+ARG GO_VERSION="1.25"
+ARG ALPINE_VERSION="3.22"
 ARG DART_SASS_VERSION="1.79.3"
 
 FROM --platform=$BUILDPLATFORM tonistiigi/xx:1.5.0 AS xx
@@ -19,7 +19,7 @@ RUN apk add clang lld
 COPY --from=xx / /
 
 ARG TARGETPLATFORM
-RUN xx-apk add musl-dev gcc g++ 
+RUN xx-apk add musl-dev gcc g++
 
 # Optionally set HUGO_BUILD_TAGS to "none" or "withdeploy" when building like so:
 # docker build --build-arg HUGO_BUILD_TAGS=withdeploy .
@@ -72,7 +72,7 @@ RUN mkdir -p /var/hugo/bin /cache && \
     adduser -Sg hugo -u 1000 -h /var/hugo hugo && \
     chown -R hugo: /var/hugo /cache && \
     # For the Hugo's Git integration to work.
-    runuser -u hugo -- git config --global --add safe.directory /project && \ 
+    runuser -u hugo -- git config --global --add safe.directory /project && \
     # See https://github.com/gohugoio/hugo/issues/9810
     runuser -u hugo -- git config --global core.quotepath false
 

README.md

@@ -34,6 +34,7 @@ A fast and flexible static site generator built with love by [bep], [spf13], and
 [![Go Report Card](https://goreportcard.com/badge/github.com/gohugoio/hugo)](https://goreportcard.com/report/github.com/gohugoio/hugo)
 
 [Website] | [Installation] | [Documentation] | [Support] | [Contributing] | <a rel="me" href="https://fosstodon.org/@gohugoio">Mastodon</a>
+
 ## Overview
 
 Hugo is a [static site generator] written in [Go], optimized for speed and designed for flexibility. With its advanced templating system and fast asset pipelines, Hugo renders a complete site in seconds, often less.
@@ -51,7 +52,7 @@ Use Hugo's embedded web server during development to instantly see changes to co
 
 Hugo's fast asset pipelines include:
 
-- Image processing &ndash; Convert, resize, crop, rotate, adjust colors, apply filters, overlay text and images, and extract EXIF data
+- Image processing &ndash; Convert, resize, crop, rotate, adjust colors, apply filters, overlay text and images, and extract metadata
 - JavaScript bundling &ndash; Transpile TypeScript and JSX to JavaScript, bundle, tree shake, minify, create source maps, and perform SRI hashing.
 - Sass processing &ndash; Transpile Sass to CSS, bundle, tree shake, minify, create source maps, perform SRI hashing, and integrate with PostCSS
 - Tailwind CSS processing &ndash; Compile Tailwind CSS utility classes into standard CSS, bundle, tree shake, optimize, minify, perform SRI hashing, and integrate with PostCSS
@@ -64,11 +65,24 @@ See the [features] section of the documentation for a comprehensive summary of H
 
 <p>&nbsp;</p>
 <p float="left">
-  <a href="https://www.linode.com/?utm_campaign=hugosponsor&utm_medium=banner&utm_source=hugogithub" target="_blank"><img src="https://raw.githubusercontent.com/gohugoio/gohugoioTheme/master/assets/images/sponsors/linode-logo_standard_light_medium.png" width="200" alt="Linode"></a>
-&nbsp;&nbsp;&nbsp;
-  <a href="https://www.jetbrains.com/go/?utm_source=OSS&utm_medium=referral&utm_campaign=hugo" target="_blank"><img src="https://raw.githubusercontent.com/gohugoio/gohugoioTheme/master/assets/images/sponsors/goland.svg" width="200" alt="The complete IDE crafted for professional Go developers."></a>
+  <a href="https://www.jetbrains.com/go/?utm_source=OSS&utm_medium=referral&utm_campaign=hugo" target="_blank"><img src="https://raw.githubusercontent.com/gohugoio/hugoDocs/master/assets/images/sponsors/goland.svg" width="200" alt="The complete IDE crafted for professional Go developers."></a>
+  &nbsp;&nbsp;&nbsp;
+    <a href="https://cloudcannon.com/hugo-cms/?utm_campaign=HugoSponsorship&utm_source=sponsor&utm_content=gohugo" target="_blank"><img src="https://raw.githubusercontent.com/gohugoio/hugoDocs/master/assets/images/sponsors/cloudcannon-cms-logo.svg" width="200" alt="CloudCannon"></a>
 </p>
 
+## Editions
+
+Hugo offers a standard edition with core features, plus extended and extended/deploy editions with more. Use the standard edition unless you need the features below.
+
+Feature|extended edition|extended/deploy edition
+:--|:-:|:-:
+[Transpile Sass to CSS] via embedded LibSass. Note that embedded LibSass was deprecated in v0.153.0 and will be removed in a future release. Use the [Dart Sass] transpiler instead, which is compatible with any edition.|:heavy_check_mark:|:heavy_check_mark:
+Deploy your site directly to a Google Cloud Storage bucket, an AWS S3 bucket, or an Azure Storage container. See&nbsp;[details].|:x:|:heavy_check_mark:
+
+[dart sass]: https://gohugo.io/functions/css/sass/#dart-sass
+[transpile sass to css]: https://gohugo.io/functions/css/sass/
+[details]: https://gohugo.io/hosting-and-deployment/hugo-deploy/
+
 ## Installation
 
 Install Hugo from a [prebuilt binary], package manager, or package repository. Please see the installation instructions for your operating system:
@@ -80,15 +94,11 @@ Install Hugo from a [prebuilt binary], package manager, or package repository. P
 
 ## Build from source
 
-Hugo is available in two editions: standard and extended. With the extended edition you can:
-
-- Encode to the WebP format when processing images. You can decode WebP images with either edition.
-- Transpile Sass to CSS using the embedded LibSass transpiler. The extended edition is not required to use the Dart Sass transpiler.
-
 Prerequisites to build Hugo from source:
 
-- Standard edition: Go 1.20 or later
-- Extended edition: Go 1.20 or later, and GCC
+- Standard edition: Go 1.24.0 or later
+- Extended edition: Go 1.24.0 or later, and GCC
+- Extended/deploy edition: Go 1.24.0 or later, and GCC
 
 Build the standard edition:
 
@@ -102,6 +112,12 @@ Build the extended edition:
 CGO_ENABLED=1 go install -tags extended github.com/gohugoio/hugo@latest
 ```
 
+Build the extended/deploy edition:
+
+```text
+CGO_ENABLED=1 go install -tags extended,withdeploy github.com/gohugoio/hugo@latest
+```
+
 ## Star History
 
 [![Star History Chart](https://api.star-history.com/svg?repos=gohugoio/hugo&type=Timeline)](https://star-history.com/#gohugoio/hugo&Timeline)
@@ -140,6 +156,16 @@ If there is sufficient interest, [create a proposal]. Do not submit a pull reque
 
 For a complete guide to contributing to Hugo, see the [Contribution Guide](CONTRIBUTING.md).
 
+## License
+
+For the Hugo source code, see [LICENSE](/LICENSE).
+
+We also bundle some libraries in binary/WASM form:
+
+* [libwebp](https://github.com/webmproject/libwebp), [BSD-3-Clause license](https://github.com/webmproject/libwebp?tab=BSD-3-Clause-1-ov-file#readme)
+* [Katex](https://github.com/KaTeX/KaTeX), [MIT license](https://github.com/KaTeX/KaTeX?tab=MIT-1-ov-file#readme)
+* [QuickJS](https://github.com/bellard/quickjs?tab=License-1-ov-file#readme), [License](https://github.com/bellard/quickjs?tab=License-1-ov-file#readme)
+
 ## Dependencies
 
 Hugo stands on the shoulders of great open source libraries. Run `hugo env --logLevel info` to display a list of dependencies.
@@ -149,50 +175,58 @@ Hugo stands on the shoulders of great open source libraries. Run `hugo env --log
 
 ```text
 github.com/BurntSushi/locker="v0.0.0-20171006230638-a6e239ea1c69"
-github.com/alecthomas/chroma/v2="v2.14.0"
-github.com/armon/go-radix="v1.0.1-0.20221118154546-54df44f2176c"
+github.com/JohannesKaufmann/dom="v0.2.0"
+github.com/JohannesKaufmann/html-to-markdown/v2="v2.5.0"
+github.com/alecthomas/chroma/v2="v2.21.1"
+github.com/aymerick/douceur="v0.2.0"
 github.com/bep/clocks="v0.5.0"
 github.com/bep/debounce="v1.2.0"
-github.com/bep/gitmap="v1.6.0"
+github.com/bep/gitmap="v1.9.0"
 github.com/bep/goat="v0.5.0"
-github.com/bep/godartsass/v2="v2.3.2"
+github.com/bep/godartsass/v2="v2.5.0"
 github.com/bep/golibsass="v1.2.0"
-github.com/bep/gowebp="v0.3.0"
-github.com/bep/imagemeta="v0.8.3"
-github.com/bep/lazycache="v0.7.0"
+github.com/bep/goportabletext="v0.1.0"
+github.com/bep/helpers="v0.6.0"
+github.com/bep/imagemeta="v0.12.0"
+github.com/bep/lazycache="v0.8.0"
 github.com/bep/logg="v0.4.0"
 github.com/bep/mclib="v1.20400.20402"
-github.com/bep/overlayfs="v0.9.2"
-github.com/bep/simplecobra="v0.4.0"
+github.com/bep/overlayfs="v0.10.0"
+github.com/bep/simplecobra="v0.6.1"
+github.com/bep/textandbinarywriter="v0.0.0-20251212174530-cd9f0732f60f"
 github.com/bep/tmc="v0.5.1"
+github.com/bits-and-blooms/bitset="v1.24.4"
 github.com/cespare/xxhash/v2="v2.3.0"
 github.com/clbanning/mxj/v2="v2.7.0"
-github.com/cli/safeexec="v1.0.1"
-github.com/cpuguy83/go-md2man/v2="v2.0.4"
+github.com/clipperhouse/displaywidth="v0.6.0"
+github.com/clipperhouse/stringish="v0.1.1"
+github.com/clipperhouse/uax29/v2="v2.3.0"
+github.com/cpuguy83/go-md2man/v2="v2.0.6"
 github.com/disintegration/gift="v1.2.1"
-github.com/dlclark/regexp2="v1.11.0"
-github.com/evanw/esbuild="v0.24.0"
+github.com/dlclark/regexp2="v1.11.5"
+github.com/evanw/esbuild="v0.27.2"
 github.com/fatih/color="v1.18.0"
 github.com/frankban/quicktest="v1.14.6"
-github.com/fsnotify/fsnotify="v1.8.0"
-github.com/getkin/kin-openapi="v0.123.0"
-github.com/ghodss/yaml="v1.0.0"
-github.com/go-openapi/jsonpointer="v0.20.2"
-github.com/go-openapi/swag="v0.22.8"
+github.com/fsnotify/fsnotify="v1.9.0"
+github.com/getkin/kin-openapi="v0.133.0"
+github.com/go-openapi/jsonpointer="v0.21.0"
+github.com/go-openapi/swag="v0.23.0"
 github.com/gobuffalo/flect="v1.0.3"
 github.com/gobwas/glob="v0.2.3"
-github.com/gohugoio/go-i18n/v2="v2.1.3-0.20230805085216-e63c13218d0e"
-github.com/gohugoio/hashstructure="v0.1.0"
-github.com/gohugoio/httpcache="v0.7.0"
-github.com/gohugoio/hugo-goldmark-extensions/extras="v0.2.0"
-github.com/gohugoio/hugo-goldmark-extensions/passthrough="v0.3.0"
+github.com/goccy/go-yaml="v1.19.1"
+github.com/gohugoio/go-i18n/v2="v2.1.3-0.20251018145728-cfcc22d823c6"
+github.com/gohugoio/go-radix="v1.2.0"
+github.com/gohugoio/hashstructure="v0.6.0"
+github.com/gohugoio/httpcache="v0.8.0"
+github.com/gohugoio/hugo-goldmark-extensions/extras="v0.5.0"
+github.com/gohugoio/hugo-goldmark-extensions/passthrough="v0.3.1"
 github.com/gohugoio/locales="v0.14.0"
 github.com/gohugoio/localescompressed="v1.0.1"
-github.com/google/go-cmp="v0.6.0"
+github.com/google/go-cmp="v0.7.0"
+github.com/gorilla/css="v1.0.1"
 github.com/gorilla/websocket="v1.5.3"
 github.com/hairyhenderson/go-codeowners="v0.7.0"
 github.com/hashicorp/golang-lru/v2="v2.0.7"
-github.com/invopop/yaml="v0.2.0"
 github.com/jdkato/prose="v1.2.1"
 github.com/josharian/intern="v1.0.0"
 github.com/kr/pretty="v0.3.1"
@@ -203,46 +237,51 @@ github.com/makeworld-the-better-one/dither/v2="v2.4.0"
 github.com/marekm4/color-extractor="v1.2.1"
 github.com/mattn/go-colorable="v0.1.13"
 github.com/mattn/go-isatty="v0.0.20"
-github.com/mattn/go-runewidth="v0.0.9"
+github.com/mattn/go-runewidth="v0.0.19"
+github.com/microcosm-cc/bluemonday="v1.0.27"
 github.com/mitchellh/mapstructure="v1.5.1-0.20231216201459-8508981c8b6c"
 github.com/mohae/deepcopy="v0.0.0-20170929034955-c48cc78d4826"
 github.com/muesli/smartcrop="v0.3.0"
-github.com/niklasfasching/go-org="v1.7.0"
-github.com/olekukonko/tablewriter="v0.0.5"
+github.com/niklasfasching/go-org="v1.9.1"
+github.com/oasdiff/yaml3="v0.0.0-20250309153720-d2182401db90"
+github.com/oasdiff/yaml="v0.0.0-20250309154309-f31be36b4037"
+github.com/olekukonko/cat="v0.0.0-20250911104152-50322a0618f6"
+github.com/olekukonko/errors="v1.1.0"
+github.com/olekukonko/ll="v0.1.3"
+github.com/olekukonko/tablewriter="v1.1.2"
 github.com/pbnjay/memory="v0.0.0-20210728143218-7b4eea64cf58"
-github.com/pelletier/go-toml/v2="v2.2.3"
+github.com/pelletier/go-toml/v2="v2.2.4"
 github.com/perimeterx/marshmallow="v1.1.5"
 github.com/pkg/browser="v0.0.0-20240102092130-5ac0b6a4141c"
 github.com/pkg/errors="v0.9.1"
-github.com/rogpeppe/go-internal="v1.13.1"
+github.com/rogpeppe/go-internal="v1.14.1"
 github.com/russross/blackfriday/v2="v2.1.0"
-github.com/sass/dart-sass/compiler="1.81.0"
-github.com/sass/dart-sass/implementation="1.81.0"
-github.com/sass/dart-sass/protocol="3.1.0"
-github.com/sass/libsass="3.6.6"
-github.com/spf13/afero="v1.11.0"
-github.com/spf13/cast="v1.7.1"
-github.com/spf13/cobra="v1.8.1"
+github.com/sass/dart-sass/compiler="1.97.1"
+github.com/sass/dart-sass/implementation="1.97.1"
+github.com/sass/dart-sass/protocol="3.2.0"
+github.com/spf13/afero="v1.15.0"
+github.com/spf13/cast="v1.10.0"
+github.com/spf13/cobra="v1.10.2"
 github.com/spf13/fsync="v0.10.1"
-github.com/spf13/pflag="v1.0.5"
-github.com/tdewolff/minify/v2="v2.20.37"
-github.com/tdewolff/parse/v2="v2.7.15"
-github.com/tetratelabs/wazero="v1.8.2"
-github.com/webmproject/libwebp="v1.3.2"
-github.com/yuin/goldmark-emoji="v1.0.4"
-github.com/yuin/goldmark="v1.7.8"
+github.com/spf13/pflag="v1.0.9"
+github.com/tdewolff/minify/v2="v2.24.8"
+github.com/tdewolff/parse/v2="v2.8.5"
+github.com/tetratelabs/wazero="v1.10.1"
+github.com/webmproject/libwebp="v1.6.0"
+github.com/woodsbury/decimal128="v1.3.0"
+github.com/yuin/goldmark-emoji="v1.0.6"
+github.com/yuin/goldmark="v1.7.13"
 go.uber.org/automaxprocs="v1.5.3"
-golang.org/x/crypto="v0.31.0"
-golang.org/x/exp="v0.0.0-20221031165847-c99f073a8326"
-golang.org/x/image="v0.22.0"
-golang.org/x/mod="v0.22.0"
-golang.org/x/net="v0.33.0"
-golang.org/x/sync="v0.10.0"
-golang.org/x/sys="v0.28.0"
-golang.org/x/text="v0.21.0"
-golang.org/x/tools="v0.28.0"
-google.golang.org/protobuf="v1.35.2"
-gopkg.in/yaml.v2="v2.4.0"
+go.yaml.in/yaml/v3="v3.0.4"
+golang.org/x/crypto="v0.46.0"
+golang.org/x/image="v0.34.0"
+golang.org/x/mod="v0.31.0"
+golang.org/x/net="v0.48.0"
+golang.org/x/sync="v0.19.0"
+golang.org/x/sys="v0.39.0"
+golang.org/x/text="v0.32.0"
+golang.org/x/tools="v0.40.0"
+google.golang.org/protobuf="v1.36.10"
 gopkg.in/yaml.v3="v3.0.1"
 rsc.io/qr="v0.2.0"
 software.sslmate.com/src/go-pkcs12="v0.2.0"

cache/dynacache/dynacache.go

@@ -69,7 +69,7 @@ func New(opts Options) *Cache {
 
 	infol := opts.Log.InfoCommand("dynacache")
 
-	evictedIdentities := collections.NewStack[KeyIdentity]()
+	evictedIdentities := collections.NewStackThreadSafe[KeyIdentity]()
 
 	onEvict := func(k, v any) {
 		if !opts.Watching {
@@ -129,7 +129,7 @@ type Cache struct {
 	partitions map[string]PartitionManager
 
 	onEvict           func(k, v any)
-	evictedIdentities *collections.Stack[KeyIdentity]
+	evictedIdentities *collections.StackThreadSafe[KeyIdentity]
 
 	opts  Options
 	infol logg.LevelLogger
@@ -176,11 +176,12 @@ func (c *Cache) ClearMatching(predicatePartition func(k string, p PartitionManag
 }
 
 // ClearOnRebuild prepares the cache for a new rebuild taking the given changeset into account.
-func (c *Cache) ClearOnRebuild(changeset ...identity.Identity) {
+// predicate is optional and will clear any entry for which it returns true.
+func (c *Cache) ClearOnRebuild(predicate func(k, v any) bool, changeset ...identity.Identity) {
 	g := rungroup.Run[PartitionManager](context.Background(), rungroup.Config[PartitionManager]{
 		NumWorkers: len(c.partitions),
 		Handle: func(ctx context.Context, partition PartitionManager) error {
-			partition.clearOnRebuild(changeset...)
+			partition.clearOnRebuild(predicate, changeset...)
 			return nil
 		},
 	})
@@ -339,7 +340,7 @@ func GetOrCreatePartition[K comparable, V any](c *Cache, name string, opts Optio
 		panic("invalid Weight, must be between 1 and 100")
 	}
 
-	if partitionNameRe.FindString(name) != name {
+	if !partitionNameRe.MatchString(name) {
 		panic(fmt.Sprintf("invalid partition name %q", name))
 	}
 
@@ -479,7 +480,12 @@ func (p *Partition[K, V]) clearMatching(predicate func(k, v any) bool) {
 	})
 }
 
-func (p *Partition[K, V]) clearOnRebuild(changeset ...identity.Identity) {
+func (p *Partition[K, V]) clearOnRebuild(predicate func(k, v any) bool, changeset ...identity.Identity) {
+	if predicate == nil {
+		predicate = func(k, v any) bool {
+			return false
+		}
+	}
 	opts := p.getOptions()
 	if opts.ClearWhen == ClearNever {
 		return
@@ -525,7 +531,7 @@ func (p *Partition[K, V]) clearOnRebuild(changeset ...identity.Identity) {
 	// Second pass needs to be done in a separate loop to catch any
 	// elements marked as stale in the other partitions.
 	p.c.DeleteFunc(func(key K, v V) bool {
-		if shouldDelete(key, v) {
+		if predicate(key, v) || shouldDelete(key, v) {
 			p.trace.Log(
 				logg.StringFunc(
 					func() string {
@@ -601,7 +607,7 @@ type PartitionManager interface {
 	adjustMaxSize(addend int) int
 	getMaxSize() int
 	getOptions() OptionsPartition
-	clearOnRebuild(changeset ...identity.Identity)
+	clearOnRebuild(predicate func(k, v any) bool, changeset ...identity.Identity)
 	clearMatching(predicate func(k, v any) bool)
 	clearStale()
 }

cache/dynacache/dynacache_test.go

@@ -147,13 +147,13 @@ func TestClear(t *testing.T) {
 
 	c.Assert(cache.Keys(predicateAll), qt.HasLen, 4)
 
-	cache.ClearOnRebuild()
+	cache.ClearOnRebuild(nil)
 
 	// Stale items are always cleared.
 	c.Assert(cache.Keys(predicateAll), qt.HasLen, 2)
 
 	cache = newTestCache(t)
-	cache.ClearOnRebuild(identity.StringIdentity("changed"))
+	cache.ClearOnRebuild(nil, identity.StringIdentity("changed"))
 
 	c.Assert(cache.Keys(nil), qt.HasLen, 1)
 
@@ -191,16 +191,16 @@ func TestPanicInCreate(t *testing.T) {
 		return err
 	}
 
-	for i := 0; i < 3; i++ {
-		for j := 0; j < 3; j++ {
+	for i := range 3 {
+		for range 3 {
 			c.Assert(willPanic(i), qt.PanicMatches, fmt.Sprintf("panic-%d", i))
 			c.Assert(willErr(i), qt.ErrorMatches, fmt.Sprintf("error-%d", i))
 		}
 	}
 
 	// Test the same keys again without the panic.
-	for i := 0; i < 3; i++ {
-		for j := 0; j < 3; j++ {
+	for i := range 3 {
+		for range 3 {
 			v, err := p1.GetOrCreate(fmt.Sprintf("panic-%d", i), func(key string) (testItem, error) {
 				return testItem{
 					name: key,

cache/filecache/filecache.go

@@ -16,6 +16,7 @@ package filecache
 import (
 	"bytes"
 	"errors"
+	"fmt"
 	"io"
 	"os"
 	"path/filepath"
@@ -54,7 +55,11 @@ type Cache struct {
 
 	nlocker *lockTracker
 
+	isResourceDir bool
+	baseDir       string
+
 	initOnce sync.Once
+	isInited bool
 	initErr  error
 }
 
@@ -109,9 +114,14 @@ func (l *lockedFile) Close() error {
 }
 
 func (c *Cache) init() error {
+	if c == nil {
+		panic("cache is nil")
+	}
 	c.initOnce.Do(func() {
+		c.isInited = true
 		// Create the base dir if it does not exist.
 		if err := c.Fs.MkdirAll("", 0o777); err != nil && !os.IsExist(err) {
+			err = fmt.Errorf("failled to create base cache directory: %s", err)
 			c.initErr = err
 		}
 	})
@@ -286,8 +296,32 @@ func (c *Cache) GetOrCreateBytes(id string, create func() ([]byte, error)) (Item
 	return info, b, nil
 }
 
+// SetBytes sets the file content with the given id in the cache.
+func (c *Cache) SetBytes(id string, data []byte) error {
+	if err := c.init(); err != nil {
+		return err
+	}
+	id = cleanID(id)
+
+	c.nlocker.Lock(id)
+	defer c.nlocker.Unlock(id)
+
+	if c.maxAge == 0 {
+		// No caching.
+		return nil
+	}
+
+	return c.writeReader(id, bytes.NewReader(data))
+}
+
 // GetBytes gets the file content with the given id from the cache, nil if none found.
-func (c *Cache) GetBytes(id string) (ItemInfo, []byte, error) {
+func (c *Cache) GetBytes(id string) ([]byte, error) {
+	_, b, err := c.GetItemBytes(id)
+	return b, err
+}
+
+// GetItemBytes gets the ItemInfo and file content with the given id from the cache, nil if none found.
+func (c *Cache) GetItemBytes(id string) (ItemInfo, []byte, error) {
 	if err := c.init(); err != nil {
 		return ItemInfo{}, nil, err
 	}
@@ -417,6 +451,17 @@ func (c *Cache) GetString(id string) string {
 // Caches is a named set of caches.
 type Caches map[string]*Cache
 
+func (f Caches) SetResourceFs(fs afero.Fs) {
+	for _, c := range f {
+		if c.isResourceDir {
+			if c.isInited {
+				panic("cannot set resource fs after init")
+			}
+			c.Fs = hugofs.NewBasePathFs(fs, c.baseDir)
+		}
+	}
+}
+
 // Get gets a named cache, nil if none found.
 func (f Caches) Get(name string) *Cache {
 	return f[strings.ToLower(name)]
@@ -424,24 +469,19 @@ func (f Caches) Get(name string) *Cache {
 
 // NewCaches creates a new set of file caches from the given
 // configuration.
-func NewCaches(p *helpers.PathSpec) (Caches, error) {
-	dcfg := p.Cfg.GetConfigSection("caches").(Configs)
-	fs := p.Fs.Source
+func NewCaches(dcfg Configs, sourceFs afero.Fs) (Caches, error) {
+	// dcfg := p.Cfg.GetConfigSection("caches").(Configs)
+	fs := sourceFs
 
 	m := make(Caches)
 	for k, v := range dcfg {
 		var cfs afero.Fs
-
 		if v.IsResourceDir {
-			cfs = p.BaseFs.ResourcesCache
+			cfs = nil // Set later. TODO(bep) this needs to be cleanded up.
 		} else {
 			cfs = fs
 		}
 
-		if cfs == nil {
-			panic("nil fs")
-		}
-
 		baseDir := v.DirCompiled
 
 		bfs := hugofs.NewBasePathFs(cfs, baseDir)
@@ -451,7 +491,11 @@ func NewCaches(p *helpers.PathSpec) (Caches, error) {
 			pruneAllRootDir = "pkg"
 		}
 
-		m[k] = NewCache(bfs, v.MaxAge, pruneAllRootDir)
+		c := NewCache(bfs, v.MaxAge, pruneAllRootDir)
+		c.isResourceDir = v.IsResourceDir
+		c.baseDir = baseDir
+
+		m[k] = c
 	}
 
 	return m, nil

cache/filecache/filecache_config.go

@@ -15,6 +15,7 @@
 package filecache
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"path"
@@ -22,7 +23,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/gohugoio/hugo/common/maps"
+	"github.com/gohugoio/hugo/common/hmaps"
 	"github.com/gohugoio/hugo/config"
 
 	"github.com/mitchellh/mapstructure"
@@ -40,27 +41,39 @@ var defaultCacheConfig = FileCacheConfig{
 }
 
 const (
-	CacheKeyGetJSON     = "getjson"
-	CacheKeyGetCSV      = "getcsv"
-	CacheKeyImages      = "images"
-	CacheKeyAssets      = "assets"
-	CacheKeyModules     = "modules"
-	CacheKeyGetResource = "getresource"
-	CacheKeyMisc        = "misc"
+	CacheKeyGetJSON       = "getjson"
+	CacheKeyGetCSV        = "getcsv"
+	CacheKeyImages        = "images"
+	CacheKeyAssets        = "assets"
+	CacheKeyModules       = "modules"
+	CacheKeyModuleQueries = "modulequeries"
+	CacheKeyGetResource   = "getresource"
+	CacheKeyMisc          = "misc"
 )
 
 type Configs map[string]FileCacheConfig
 
+// CacheDirModules returns the compiled path to the modules cache.
 // For internal use.
 func (c Configs) CacheDirModules() string {
 	return c[CacheKeyModules].DirCompiled
 }
 
+// CacheDirMisc returns the compiled path to the misc cache.
+// For internal use.
+func (c Configs) CacheDirMisc() string {
+	return c[CacheKeyMisc].DirCompiled
+}
+
 var defaultCacheConfigs = Configs{
 	CacheKeyModules: {
 		MaxAge: -1,
 		Dir:    ":cacheDir/modules",
 	},
+	CacheKeyModuleQueries: {
+		MaxAge: 24 * time.Hour,
+		Dir:    ":cacheDir/modules",
+	},
 	CacheKeyGetJSON: defaultCacheConfig,
 	CacheKeyGetCSV:  defaultCacheConfig,
 	CacheKeyImages: {
@@ -100,6 +113,23 @@ type FileCacheConfig struct {
 	IsResourceDir bool `json:"-"`
 }
 
+// MarshalJSON marshals FileCacheConfig to JSON with MaxAge as a human-readable string.
+func (c FileCacheConfig) MarshalJSON() ([]byte, error) {
+	var maxAge any
+	if c.MaxAge == -1 {
+		maxAge = -1
+	} else {
+		maxAge = strings.TrimSuffix(c.MaxAge.String(), "0m0s")
+	}
+	return json.Marshal(&struct {
+		MaxAge any    `json:"maxAge"`
+		Dir    string `json:"dir"`
+	}{
+		MaxAge: maxAge,
+		Dir:    c.Dir,
+	})
+}
+
 // GetJSONCache gets the file cache for getJSON.
 func (f Caches) GetJSONCache() *Cache {
 	return f[CacheKeyGetJSON]
@@ -120,6 +150,16 @@ func (f Caches) ModulesCache() *Cache {
 	return f[CacheKeyModules]
 }
 
+// ModuleQueriesCache gets the file cache for Hugo Module version queries.
+// Returns nil if not found.
+func (f Caches) ModuleQueriesCache() *Cache {
+	c, ok := f[CacheKeyModuleQueries]
+	if !ok {
+		panic("module queries cache not set")
+	}
+	return c
+}
+
 // AssetsCache gets the file cache for assets (processed resources, SCSS etc.).
 func (f Caches) AssetsCache() *Cache {
 	return f[CacheKeyAssets]
@@ -147,7 +187,7 @@ func DecodeConfig(fs afero.Fs, bcfg config.BaseConfig, m map[string]any) (Config
 	_, isOsFs := fs.(*afero.OsFs)
 
 	for k, v := range m {
-		if _, ok := v.(maps.Params); !ok {
+		if _, ok := v.(hmaps.Params); !ok {
 			continue
 		}
 		cc := defaultCacheConfig

cache/filecache/filecache_config_test.go

@@ -14,6 +14,7 @@
 package filecache_test
 
 import (
+	"encoding/json"
 	"path/filepath"
 	"runtime"
 	"testing"
@@ -59,7 +60,7 @@ dir = "/path/to/c4"
 	c.Assert(err, qt.IsNil)
 	fs := afero.NewMemMapFs()
 	decoded := testconfig.GetTestConfigs(fs, cfg).Base.Caches
-	c.Assert(len(decoded), qt.Equals, 7)
+	c.Assert(len(decoded), qt.Equals, 8)
 
 	c2 := decoded["getcsv"]
 	c.Assert(c2.MaxAge.String(), qt.Equals, "11h0m0s")
@@ -106,7 +107,7 @@ dir = "/path/to/c4"
 	c.Assert(err, qt.IsNil)
 	fs := afero.NewMemMapFs()
 	decoded := testconfig.GetTestConfigs(fs, cfg).Base.Caches
-	c.Assert(len(decoded), qt.Equals, 7)
+	c.Assert(len(decoded), qt.Equals, 8)
 
 	for _, v := range decoded {
 		c.Assert(v.MaxAge, qt.Equals, time.Duration(0))
@@ -129,7 +130,7 @@ func TestDecodeConfigDefault(t *testing.T) {
 
 	fs := afero.NewMemMapFs()
 	decoded := testconfig.GetTestConfigs(fs, cfg).Base.Caches
-	c.Assert(len(decoded), qt.Equals, 7)
+	c.Assert(len(decoded), qt.Equals, 8)
 
 	imgConfig := decoded[filecache.CacheKeyImages]
 	jsonConfig := decoded[filecache.CacheKeyGetJSON]
@@ -144,3 +145,29 @@ func TestDecodeConfigDefault(t *testing.T) {
 	c.Assert(imgConfig.IsResourceDir, qt.Equals, true)
 	c.Assert(jsonConfig.IsResourceDir, qt.Equals, false)
 }
+
+func TestFileCacheConfigMarshalJSON(t *testing.T) {
+	c := qt.New(t)
+
+	cfg := config.New()
+	cfg.Set("cacheDir", "/cache")
+	cfg.Set("workingDir", "/my/project")
+
+	fs := afero.NewMemMapFs()
+	decoded := testconfig.GetTestConfigs(fs, cfg).Base.Caches
+
+	moduleQueriesConfig := decoded[filecache.CacheKeyModuleQueries]
+	c.Assert(moduleQueriesConfig.MaxAge, qt.Equals, 24*time.Hour)
+
+	b, err := json.Marshal(moduleQueriesConfig)
+	c.Assert(err, qt.IsNil)
+
+	c.Assert(string(b), qt.Contains, `"maxAge":"24h"`)
+	c.Assert(string(b), qt.Not(qt.Contains), "86400000000000")
+	c.Assert(string(b), qt.Not(qt.Contains), "8.64e")
+
+	moduleQueriesConfig.MaxAge = -1
+	b, err = json.Marshal(moduleQueriesConfig)
+	c.Assert(err, qt.IsNil)
+	c.Assert(string(b), qt.Contains, `"maxAge":-1`)
+}

cache/filecache/filecache_integration_test.go

@@ -67,7 +67,7 @@ title: "Home"
 ---
 -- assets/a/pixel.png --
 iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYPhfDwAChwGA60e6kgAAAABJRU5ErkJggg==
--- layouts/index.html --
+-- layouts/home.html --
 {{ warnf "HOME!" }}
 {{ $img := resources.GetMatch "**.png" }}
 {{ $img = $img.Resize "3x3" }}

cache/filecache/filecache_pruner_test.go

@@ -55,11 +55,14 @@ dir = ":resourceDir/_gen"
 
 	for _, name := range []string{filecache.CacheKeyGetCSV, filecache.CacheKeyGetJSON, filecache.CacheKeyAssets, filecache.CacheKeyImages} {
 		msg := qt.Commentf("cache: %s", name)
-		p := newPathsSpec(t, afero.NewMemMapFs(), configStr)
-		caches, err := filecache.NewCaches(p)
+		fs := afero.NewMemMapFs()
+		p := newPathsSpec(t, fs, configStr)
+		fileCachConfig := p.Cfg.GetConfigSection("caches").(filecache.Configs)
+		caches, err := filecache.NewCaches(fileCachConfig, fs)
 		c.Assert(err, qt.IsNil)
+		caches.SetResourceFs(fs)
 		cache := caches[name]
-		for i := 0; i < 10; i++ {
+		for i := range 10 {
 			id := fmt.Sprintf("i%d", i)
 			cache.GetOrCreateBytes(id, func() ([]byte, error) {
 				return []byte("abc"), nil
@@ -74,7 +77,7 @@ dir = ":resourceDir/_gen"
 		c.Assert(err, qt.IsNil)
 		c.Assert(count, qt.Equals, 5, msg)
 
-		for i := 0; i < 10; i++ {
+		for i := range 10 {
 			id := fmt.Sprintf("i%d", i)
 			v := cache.GetString(id)
 			if i < 5 {
@@ -84,8 +87,9 @@ dir = ":resourceDir/_gen"
 			}
 		}
 
-		caches, err = filecache.NewCaches(p)
+		caches, err = filecache.NewCaches(fileCachConfig, fs)
 		c.Assert(err, qt.IsNil)
+		caches.SetResourceFs(fs)
 		cache = caches[name]
 		// Touch one and then prune.
 		cache.GetOrCreateBytes("i5", func() ([]byte, error) {
@@ -97,7 +101,7 @@ dir = ":resourceDir/_gen"
 		c.Assert(count, qt.Equals, 4)
 
 		// Now only the i5 should be left.
-		for i := 0; i < 10; i++ {
+		for i := range 10 {
 			id := fmt.Sprintf("i%d", i)
 			v := cache.GetString(id)
 			if i != 5 {

cache/filecache/filecache_test.go

@@ -18,6 +18,8 @@ import (
 	"fmt"
 	"io"
 	"strings"
+
+	"github.com/gohugoio/hugo/htesting"
 	"sync"
 	"testing"
 	"time"
@@ -78,9 +80,11 @@ dir = ":cacheDir/c"
 		configStr = strings.Replace(configStr, "\\", winPathSep, -1)
 
 		p := newPathsSpec(t, osfs, configStr)
+		fileCachConfig := p.Cfg.GetConfigSection("caches").(filecache.Configs)
 
-		caches, err := filecache.NewCaches(p)
+		caches, err := filecache.NewCaches(fileCachConfig, p.Fs.Source)
 		c.Assert(err, qt.IsNil)
+		caches.SetResourceFs(p.SourceFs)
 
 		cache := caches.Get("GetJSON")
 		c.Assert(cache, qt.Not(qt.IsNil))
@@ -105,7 +109,7 @@ dir = ":cacheDir/c"
 		}
 
 		for _, ca := range []*filecache.Cache{caches.ImageCache(), caches.AssetsCache(), caches.GetJSONCache(), caches.GetCSVCache()} {
-			for i := 0; i < 2; i++ {
+			for range 2 {
 				info, r, err := ca.GetOrCreate("a", rf("abc"))
 				c.Assert(err, qt.IsNil)
 				c.Assert(r, qt.Not(qt.IsNil))
@@ -149,7 +153,7 @@ dir = ":cacheDir/c"
 		r.Close()
 		c.Assert(string(b), qt.Equals, "Hugo is great!")
 
-		info, b, err = caches.ImageCache().GetBytes("mykey")
+		info, b, err = caches.ImageCache().GetItemBytes("mykey")
 		c.Assert(err, qt.IsNil)
 		c.Assert(info.Name, qt.Equals, "mykey")
 		c.Assert(string(b), qt.Equals, "Hugo is great!")
@@ -158,6 +162,7 @@ dir = ":cacheDir/c"
 }
 
 func TestFileCacheConcurrent(t *testing.T) {
+	htesting.SkipSlowTestUnlessCI(t)
 	t.Parallel()
 
 	c := qt.New(t)
@@ -179,9 +184,10 @@ dir = "/cache/c"
 `
 
 	p := newPathsSpec(t, afero.NewMemMapFs(), configStr)
-
-	caches, err := filecache.NewCaches(p)
+	fileCachConfig := p.Cfg.GetConfigSection("caches").(filecache.Configs)
+	caches, err := filecache.NewCaches(fileCachConfig, p.Fs.Source)
 	c.Assert(err, qt.IsNil)
+	caches.SetResourceFs(p.Fs.Source)
 
 	const cacheName = "getjson"
 
@@ -193,11 +199,11 @@ dir = "/cache/c"
 
 	var wg sync.WaitGroup
 
-	for i := 0; i < 50; i++ {
+	for i := range 50 {
 		wg.Add(1)
 		go func(i int) {
 			defer wg.Done()
-			for j := 0; j < 20; j++ {
+			for range 20 {
 				ca := caches.Get(cacheName)
 				c.Assert(ca, qt.Not(qt.IsNil))
 				filename, data := filenameData(i)
@@ -270,7 +276,7 @@ func newPathsSpec(t *testing.T, fs afero.Fs, configStr string) *helpers.PathSpec
 	cfg, err := config.FromConfigString(configStr, "toml")
 	c.Assert(err, qt.IsNil)
 	acfg := testconfig.GetTestConfig(fs, cfg)
-	p, err := helpers.NewPathSpec(hugofs.NewFrom(fs, acfg.BaseConfig()), acfg, nil)
+	p, err := helpers.NewPathSpec(hugofs.NewFrom(fs, acfg.BaseConfig()), acfg, nil, nil)
 	c.Assert(err, qt.IsNil)
 	return p
 }

cache/httpcache/httpcache.go

@@ -25,6 +25,8 @@ import (
 
 // DefaultConfig holds the default configuration for the HTTP cache.
 var DefaultConfig = Config{
+	RespectCacheControlNoStoreInRequest:  true,
+	RespectCacheControlNoStoreInResponse: false,
 	Cache: Cache{
 		For: GlobMatcher{
 			Excludes: []string{"**"},
@@ -42,7 +44,13 @@ var DefaultConfig = Config{
 
 // Config holds the configuration for the HTTP cache.
 type Config struct {
-	// Configures the HTTP cache behaviour (RFC 9111).
+	// When enabled and there's a Cache-Control: no-store directive in the request, response will never be stored in disk cache.
+	RespectCacheControlNoStoreInRequest bool
+
+	// When enabled and there's a Cache-Control: no-store directive in the response, response will never be stored in disk cache.
+	RespectCacheControlNoStoreInResponse bool
+
+	// Enables HTTP cache behavior (RFC 9111) for these resources.
 	// When this is not enabled for a resource, Hugo will go straight to the file cache.
 	Cache Cache
 
@@ -52,12 +60,14 @@ type Config struct {
 }
 
 type Cache struct {
-	// Enable HTTP cache behaviour (RFC 9111) for these rsources.
+	// Enable HTTP cache behavior (RFC 9111) for these resources.
 	For GlobMatcher
 }
 
 func (c *Config) Compile() (ConfigCompiled, error) {
-	var cc ConfigCompiled
+	cc := ConfigCompiled{
+		Base: *c,
+	}
 
 	p, err := c.Cache.For.CompilePredicate()
 	if err != nil {
@@ -122,7 +132,12 @@ type GlobMatcher struct {
 	Includes []string
 }
 
+func (gm GlobMatcher) IsZero() bool {
+	return len(gm.Includes) == 0 && len(gm.Excludes) == 0
+}
+
 type ConfigCompiled struct {
+	Base        Config
 	For         predicate.P[string]
 	PollConfigs []PollConfigCompiled
 }
@@ -155,16 +170,19 @@ func (p PollConfigCompiled) IsZero() bool {
 }
 
 func (gm *GlobMatcher) CompilePredicate() (func(string) bool, error) {
-	var p predicate.P[string]
+	if gm.IsZero() {
+		panic("no includes or excludes")
+	}
+	var b predicate.PR[string]
 	for _, include := range gm.Includes {
 		g, err := glob.Compile(include, '/')
 		if err != nil {
 			return nil, err
 		}
-		fn := func(s string) bool {
-			return g.Match(s)
+		fn := func(s string) predicate.Match {
+			return predicate.BoolMatch(g.Match(s))
 		}
-		p = p.Or(fn)
+		b = b.Or(fn)
 	}
 
 	for _, exclude := range gm.Excludes {
@@ -172,16 +190,16 @@ func (gm *GlobMatcher) CompilePredicate() (func(string) bool, error) {
 		if err != nil {
 			return nil, err
 		}
-		fn := func(s string) bool {
-			return !g.Match(s)
+		fn := func(s string) predicate.Match {
+			return predicate.BoolMatch(!g.Match(s))
 		}
-		p = p.And(fn)
+		b = b.And(fn)
 	}
 
-	return p, nil
+	return b.BoolFunc(), nil
 }
 
-func DecodeConfig(bcfg config.BaseConfig, m map[string]any) (Config, error) {
+func DecodeConfig(_ config.BaseConfig, m map[string]any) (Config, error) {
 	if len(m) == 0 {
 		return DefaultConfig, nil
 	}
@@ -203,5 +221,20 @@ func DecodeConfig(bcfg config.BaseConfig, m map[string]any) (Config, error) {
 		return c, err
 	}
 
+	if c.Cache.For.IsZero() {
+		c.Cache.For = DefaultConfig.Cache.For
+	}
+
+	for pci := range c.Polls {
+		if c.Polls[pci].For.IsZero() {
+			c.Polls[pci].For = DefaultConfig.Cache.For
+			c.Polls[pci].Disable = true
+		}
+	}
+
+	if len(c.Polls) == 0 {
+		c.Polls = DefaultConfig.Polls
+	}
+
 	return c, nil
 }

cache/httpcache/httpcache_integration_test.go

@@ -22,6 +22,8 @@ import (
 )
 
 func TestConfigCustom(t *testing.T) {
+	t.Parallel()
+
 	files := `
 -- hugo.toml --
 [httpcache]
@@ -51,6 +53,8 @@ includes = ["**gohugo.io**"]
 }
 
 func TestConfigDefault(t *testing.T) {
+	t.Parallel()
+
 	files := `
 -- hugo.toml --
 `
@@ -62,3 +66,30 @@ func TestConfigDefault(t *testing.T) {
 	b.Assert(compiled.For("https://gohugo.io/foo.jpg"), qt.IsFalse)
 	b.Assert(compiled.PollConfigFor("https://gohugo.io/foo.jpg").Config.Disable, qt.IsTrue)
 }
+
+func TestConfigPollsOnly(t *testing.T) {
+	t.Parallel()
+	files := `
+-- hugo.toml --
+[httpcache]
+[[httpcache.polls]]
+low = "5s"
+high = "32s"
+[httpcache.polls.for]
+includes = ["**gohugo.io**"]
+		
+	
+`
+
+	b := hugolib.Test(t, files)
+
+	compiled := b.H.Configs.Base.C.HTTPCache
+
+	b.Assert(compiled.For("https://gohugo.io/posts.json"), qt.IsFalse)
+	b.Assert(compiled.For("https://gohugo.io/foo.jpg"), qt.IsFalse)
+
+	pc := compiled.PollConfigFor("https://gohugo.io/foo.jpg")
+	b.Assert(pc.Config.Low, qt.Equals, 5*time.Second)
+	b.Assert(pc.Config.High, qt.Equals, 32*time.Second)
+	b.Assert(compiled.PollConfigFor("https://example.com/foo.jpg").IsZero(), qt.IsTrue)
+}

cache/httpcache/httpcache_test.go

@@ -17,6 +17,7 @@ import (
 	"testing"
 
 	qt "github.com/frankban/quicktest"
+	"github.com/gohugoio/hugo/config"
 )
 
 func TestGlobMatcher(t *testing.T) {
@@ -40,3 +41,33 @@ func TestGlobMatcher(t *testing.T) {
 	c.Assert(p("foo/bar/foo.css"), qt.IsFalse)
 	c.Assert(p("foo/bar/foo.xml"), qt.IsTrue)
 }
+
+func TestDefaultConfig(t *testing.T) {
+	c := qt.New(t)
+
+	_, err := DefaultConfig.Compile()
+	c.Assert(err, qt.IsNil)
+}
+
+func TestDecodeConfigInjectsDefaultAndCompiles(t *testing.T) {
+	c := qt.New(t)
+
+	cfg, err := DecodeConfig(config.BaseConfig{}, map[string]any{})
+	c.Assert(err, qt.IsNil)
+	c.Assert(cfg, qt.DeepEquals, DefaultConfig)
+
+	_, err = cfg.Compile()
+	c.Assert(err, qt.IsNil)
+
+	cfg, err = DecodeConfig(config.BaseConfig{}, map[string]any{
+		"cache": map[string]any{
+			"polls": []map[string]any{
+				{"disable": true},
+			},
+		},
+	})
+	c.Assert(err, qt.IsNil)
+
+	_, err = cfg.Compile()
+	c.Assert(err, qt.IsNil)
+}

check.sh

@@ -0,0 +1,82 @@
+#!/bin/bash
+
+set -e
+
+# Default to all packages if none specified
+PACKAGES="${1:-./...}"
+
+echo "==> Checking packages: $PACKAGES"
+
+# Timing arrays
+declare -a STEP_NAMES
+declare -a STEP_TIMES
+
+time_step() {
+    local name="$1"
+    shift
+    local start=$(date +%s.%N)
+    "$@"
+    local end=$(date +%s.%N)
+    local elapsed=$(echo "$end - $start" | bc)
+    STEP_NAMES+=("$name")
+    STEP_TIMES+=("$elapsed")
+}
+
+# Check gofmt
+run_gofmt() {
+    echo "==> Running gofmt..."
+    # Convert package pattern to path (e.g., ./hugolib/... -> ./hugolib)
+    local path="${PACKAGES%/...}"
+    GOFMT_OUTPUT=$(gofmt -l "$path" 2>&1) || true
+    if [ -n "$GOFMT_OUTPUT" ]; then
+        echo "gofmt found issues in:"
+        echo "$GOFMT_OUTPUT"
+        exit 1
+    fi
+    echo "    OK"
+}
+
+# Run staticcheck
+run_staticcheck() {
+    # Check if staticcheck is installed, install if not
+    if ! command -v staticcheck &> /dev/null; then
+        echo "==> Installing staticcheck..."
+        go install honnef.co/go/tools/cmd/staticcheck@latest
+    fi
+    echo "==> Running staticcheck..."
+    staticcheck $PACKAGES
+    echo "    OK"
+}
+
+# Run tests
+run_tests() {
+    echo "==> Running tests..."
+    local output
+    if ! output=$(go test $PACKAGES 2>&1); then
+        echo "$output"
+        exit 1
+    fi
+    echo "    OK"
+}
+
+# Run all steps with timing
+TOTAL_START=$(date +%s.%N)
+
+time_step "gofmt" run_gofmt
+time_step "staticcheck" run_staticcheck
+time_step "tests" run_tests
+
+TOTAL_END=$(date +%s.%N)
+TOTAL_ELAPSED=$(echo "$TOTAL_END - $TOTAL_START" | bc)
+
+# Print timing summary
+echo ""
+echo "==> All checks passed!"
+echo ""
+echo "Timing summary:"
+echo "---------------"
+for i in "${!STEP_NAMES[@]}"; do
+    printf "  %-15s %6.2fs\n" "${STEP_NAMES[$i]}" "${STEP_TIMES[$i]}"
+done
+echo "---------------"
+printf "  %-15s %6.2fs\n" "Total" "$TOTAL_ELAPSED"

codegen/methods.go

@@ -26,6 +26,7 @@ import (
 	"path/filepath"
 	"reflect"
 	"regexp"
+	"slices"
 	"sort"
 	"strings"
 	"sync"
@@ -102,7 +103,7 @@ func (c *Inspector) MethodsFromTypes(include []reflect.Type, exclude []reflect.T
 	}
 
 	for _, t := range include {
-		for i := 0; i < t.NumMethod(); i++ {
+		for i := range t.NumMethod() {
 
 			m := t.Method(i)
 			if excludes[m.Name] || seen[m.Name] {
@@ -122,7 +123,7 @@ func (c *Inspector) MethodsFromTypes(include []reflect.Type, exclude []reflect.T
 
 			method := Method{Owner: t, OwnerName: ownerName, Name: m.Name}
 
-			for i := 0; i < numIn; i++ {
+			for i := range numIn {
 				in := m.Type.In(i)
 
 				name, pkg := nameAndPackage(in)
@@ -137,7 +138,7 @@ func (c *Inspector) MethodsFromTypes(include []reflect.Type, exclude []reflect.T
 			numOut := m.Type.NumOut()
 
 			if numOut > 0 {
-				for i := 0; i < numOut; i++ {
+				for i := range numOut {
 					out := m.Type.Out(i)
 					name, pkg := nameAndPackage(out)
 
@@ -304,7 +305,7 @@ func (m Method) inOutStr() string {
 	}
 
 	args := make([]string, len(m.In))
-	for i := 0; i < len(args); i++ {
+	for i := range args {
 		args[i] = fmt.Sprintf("arg%d", i)
 	}
 	return "(" + strings.Join(args, ", ") + ")"
@@ -316,7 +317,7 @@ func (m Method) inStr() string {
 	}
 
 	args := make([]string, len(m.In))
-	for i := 0; i < len(args); i++ {
+	for i := range args {
 		args[i] = fmt.Sprintf("arg%d %s", i, m.In[i])
 	}
 	return "(" + strings.Join(args, ", ") + ")"
@@ -339,7 +340,7 @@ func (m Method) outStrNamed() string {
 	}
 
 	outs := make([]string, len(m.Out))
-	for i := 0; i < len(outs); i++ {
+	for i := range outs {
 		outs[i] = fmt.Sprintf("o%d %s", i, m.Out[i])
 	}
 
@@ -435,7 +436,7 @@ func (m Methods) ToMarshalJSON(receiver, pkgPath string, excludes ...string) (st
 		// Exclude self
 		for i, pkgImp := range pkgImports {
 			if pkgImp == pkgPath {
-				pkgImports = append(pkgImports[:i], pkgImports[i+1:]...)
+				pkgImports = slices.Delete(pkgImports, i, i+1)
 			}
 		}
 	}

commands/commandeer.go

@@ -101,8 +101,8 @@ type configKey struct {
 
 // This is the root command.
 type rootCommand struct {
-	Printf  func(format string, v ...interface{})
-	Println func(a ...interface{})
+	Printf  func(format string, v ...any)
+	Println func(a ...any)
 	StdOut  io.Writer
 	StdErr  io.Writer
 
@@ -401,9 +401,7 @@ func (r *rootCommand) Run(ctx context.Context, cd *simplecobra.Commandeer, args
 
 	watchGroups := helpers.ExtractAndGroupRootPaths(watchDirs)
 
-	for _, group := range watchGroups {
-		r.Printf("Watching for changes in %s\n", group)
-	}
+	r.Printf("Watching for changes in %s\n", strings.Join(watchGroups, ", "))
 	watcher, err := b.newWatcher(r.poll, watchDirs...)
 	if err != nil {
 		return err
@@ -431,12 +429,12 @@ func (r *rootCommand) PreRun(cd, runner *simplecobra.Commandeer) error {
 	// Used by mkcert (server).
 	log.SetOutput(r.StdOut)
 
-	r.Printf = func(format string, v ...interface{}) {
+	r.Printf = func(format string, v ...any) {
 		if !r.quiet {
 			fmt.Fprintf(r.StdOut, format, v...)
 		}
 	}
-	r.Println = func(a ...interface{}) {
+	r.Println = func(a ...any) {
 		if !r.quiet {
 			fmt.Fprintln(r.StdOut, a...)
 		}
@@ -448,7 +446,7 @@ func (r *rootCommand) PreRun(cd, runner *simplecobra.Commandeer) error {
 		return err
 	}
 	// Set up the global logger early to allow info deprecations during config load.
-	loggers.InitGlobalLogger(r.logger.Level(), false)
+	loggers.SetGlobalLogger(r.logger)
 
 	r.changesFromBuild = make(chan []identity.Identity, 10)
 

commands/config.go

@@ -23,8 +23,9 @@ import (
 	"time"
 
 	"github.com/bep/simplecobra"
-	"github.com/gohugoio/hugo/common/maps"
+	"github.com/gohugoio/hugo/common/hmaps"
 	"github.com/gohugoio/hugo/config/allconfig"
+	"github.com/gohugoio/hugo/hugolib/sitesmatrix"
 	"github.com/gohugoio/hugo/modules"
 	"github.com/gohugoio/hugo/parser"
 	"github.com/gohugoio/hugo/parser/metadecoders"
@@ -71,7 +72,7 @@ func (c *configCommand) Run(ctx context.Context, cd *simplecobra.Commandeer, arg
 			return fmt.Errorf("language %q not found", c.lang)
 		}
 	} else {
-		config = conf.configs.LanguageConfigSlice[0]
+		config = conf.configs.LanguageConfigMap[conf.configs.Base.DefaultContentLanguage]
 	}
 
 	var buf bytes.Buffer
@@ -90,11 +91,11 @@ func (c *configCommand) Run(ctx context.Context, cd *simplecobra.Commandeer, arg
 		os.Stdout.Write(buf.Bytes())
 	default:
 		// Decode the JSON to a map[string]interface{} and then unmarshal it again to the correct format.
-		var m map[string]interface{}
+		var m map[string]any
 		if err := json.Unmarshal(buf.Bytes(), &m); err != nil {
 			return err
 		}
-		maps.ConvertFloat64WithNoDecimalsToInt(m)
+		hmaps.ConvertFloat64WithNoDecimalsToInt(m)
 		switch format {
 		case "yaml":
 			return parser.InterfaceToConfig(m, metadecoders.YAML, os.Stdout)
@@ -128,9 +129,9 @@ func (c *configCommand) PreRun(cd, runner *simplecobra.Commandeer) error {
 }
 
 type configModMount struct {
-	Source string `json:"source"`
-	Target string `json:"target"`
-	Lang   string `json:"lang,omitempty"`
+	Source string            `json:"source"`
+	Target string            `json:"target"`
+	Sites  sitesmatrix.Sites `json:"sites,omitzero"`
 }
 
 type configModMounts struct {
@@ -146,7 +147,7 @@ func (m *configModMounts) MarshalJSON() ([]byte, error) {
 		mounts = append(mounts, configModMount{
 			Source: mount.Source,
 			Target: mount.Target,
-			Lang:   mount.Lang,
+			Sites:  mount.Sites,
 		})
 	}
 

commands/deploy.go

@@ -12,7 +12,6 @@
 // limitations under the License.
 
 //go:build withdeploy
-// +build withdeploy
 
 package commands
 

commands/deploy_off.go

@@ -12,7 +12,6 @@
 // limitations under the License.
 
 //go:build !withdeploy
-// +build !withdeploy
 
 // Copyright 2024 The Hugo Authors. All rights reserved.
 //

commands/gen.go

@@ -21,12 +21,14 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"slices"
 	"strings"
 
 	"github.com/alecthomas/chroma/v2"
 	"github.com/alecthomas/chroma/v2/formatters/html"
 	"github.com/alecthomas/chroma/v2/styles"
 	"github.com/bep/simplecobra"
+	"github.com/goccy/go-yaml"
 	"github.com/gohugoio/hugo/common/hugo"
 	"github.com/gohugoio/hugo/docshelper"
 	"github.com/gohugoio/hugo/helpers"
@@ -35,7 +37,6 @@ import (
 	"github.com/gohugoio/hugo/parser"
 	"github.com/spf13/cobra"
 	"github.com/spf13/cobra/doc"
-	"gopkg.in/yaml.v2"
 )
 
 func newGenCommand() *genCommand {
@@ -49,6 +50,8 @@ func newGenCommand() *genCommand {
 		highlightStyle         string
 		lineNumbersInlineStyle string
 		lineNumbersTableStyle  string
+		omitEmpty              bool
+		omitClassComments      bool
 	)
 
 	newChromaStyles := func() simplecobra.Commander {
@@ -60,6 +63,10 @@ func newGenCommand() *genCommand {
 See https://xyproto.github.io/splash/docs/all.html for a preview of the available styles`,
 
 			run: func(ctx context.Context, cd *simplecobra.Commandeer, r *rootCommand, args []string) error {
+				style = strings.ToLower(style)
+				if !slices.Contains(styles.Names(), style) {
+					return fmt.Errorf("invalid style: %s", style)
+				}
 				builder := styles.Get(style).Builder()
 				if highlightStyle != "" {
 					builder.Add(chroma.LineHighlight, highlightStyle)
@@ -74,7 +81,16 @@ See https://xyproto.github.io/splash/docs/all.html for a preview of the availabl
 				if err != nil {
 					return err
 				}
-				formatter := html.New(html.WithAllClasses(true))
+
+				if omitEmpty {
+					// See https://github.com/alecthomas/chroma/commit/5b2a4c5a26c503c79bc86ba3c4ae5b330028bd3d
+					hugo.Deprecate("--omitEmpty", "Flag is no longer needed, empty classes are now always omitted.", "v0.149.0")
+				}
+				options := []html.Option{
+					html.WithCSSComments(!omitClassComments),
+				}
+				formatter := html.New(options...)
+
 				w := os.Stdout
 				fmt.Fprintf(w, "/* Generated using: hugo %s */\n\n", strings.Join(os.Args[1:], " "))
 				formatter.WriteCSS(w, style)
@@ -90,6 +106,10 @@ See https://xyproto.github.io/splash/docs/all.html for a preview of the availabl
 				_ = cmd.RegisterFlagCompletionFunc("lineNumbersInlineStyle", cobra.NoFileCompletions)
 				cmd.PersistentFlags().StringVar(&lineNumbersTableStyle, "lineNumbersTableStyle", "", `foreground and background colors for table line numbers, e.g. --lineNumbersTableStyle "#fff000 bg:#000fff"`)
 				_ = cmd.RegisterFlagCompletionFunc("lineNumbersTableStyle", cobra.NoFileCompletions)
+				cmd.PersistentFlags().BoolVar(&omitEmpty, "omitEmpty", false, `omit empty CSS rules (deprecated, no longer needed)`)
+				_ = cmd.RegisterFlagCompletionFunc("omitEmpty", cobra.NoFileCompletions)
+				cmd.PersistentFlags().BoolVar(&omitClassComments, "omitClassComments", false, `omit CSS class comment prefixes in the generated CSS`)
+				_ = cmd.RegisterFlagCompletionFunc("omitClassComments", cobra.NoFileCompletions)
 			},
 		}
 	}
@@ -144,7 +164,7 @@ url: %s
 
 		return &simpleCommand{
 			name:  "doc",
-			short: "Generate Markdown documentation for the Hugo CLI.",
+			short: "Generate Markdown documentation for the Hugo CLI",
 			long: `Generate Markdown documentation for the Hugo CLI.
 			This command is, mostly, used to create up-to-date documentation
 	of Hugo's command-line interface for https://gohugo.io/.
@@ -169,13 +189,13 @@ url: %s
 				prepender := func(filename string) string {
 					name := filepath.Base(filename)
 					base := strings.TrimSuffix(name, path.Ext(name))
-					url := "/commands/" + strings.ToLower(base) + "/"
+					url := "/docs/reference/commands/" + strings.ToLower(base) + "/"
 					return fmt.Sprintf(gendocFrontmatterTemplate, strings.Replace(base, "_", " ", -1), base, url)
 				}
 
 				linkHandler := func(name string) string {
 					base := strings.TrimSuffix(name, path.Ext(name))
-					return "/commands/" + strings.ToLower(base) + "/"
+					return "/docs/reference/commands/" + strings.ToLower(base) + "/"
 				}
 				r.Println("Generating Hugo command-line documentation in", gendocdir, "...")
 				doc.GenMarkdownTreeCustom(cd.CobraCommand.Root(), gendocdir, prepender, linkHandler)
@@ -196,7 +216,7 @@ url: %s
 	newDocsHelper := func() simplecobra.Commander {
 		return &simpleCommand{
 			name:  "docshelper",
-			short: "Generate some data files for the Hugo docs.",
+			short: "Generate some data files for the Hugo docs",
 
 			run: func(ctx context.Context, cd *simplecobra.Commandeer, r *rootCommand, args []string) error {
 				r.Println("Generate docs data to", docsHelperTarget)
@@ -217,7 +237,7 @@ url: %s
 				}
 
 				// Decode the JSON to a map[string]interface{} and then unmarshal it again to the correct format.
-				var m map[string]interface{}
+				var m map[string]any
 				if err := json.Unmarshal(buf.Bytes(), &m); err != nil {
 					return err
 				}
@@ -229,7 +249,7 @@ url: %s
 					return err
 				}
 				defer f.Close()
-				yamlEnc := yaml.NewEncoder(f)
+				yamlEnc := yaml.NewEncoder(f, yaml.UseSingleQuote(true), yaml.AutoInt())
 				if err := yamlEnc.Encode(m); err != nil {
 					return err
 				}

commands/helpers.go

@@ -76,7 +76,7 @@ func flagsToCfgWithAdditionalConfigBase(cd *simplecobra.Commandeer, cfg config.P
 
 	// Flags with a different name in the config.
 	keyMap := map[string]string{
-		"minify":      "minifyOutput",
+		"minify":      "minify.minifyOutput",
 		"destination": "publishDir",
 		"editor":      "newContentEditor",
 	}

commands/hugobuilder.go

@@ -27,13 +27,15 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/bep/debounce"
 	"github.com/bep/simplecobra"
 	"github.com/fsnotify/fsnotify"
 	"github.com/gohugoio/hugo/common/herrors"
+	"github.com/gohugoio/hugo/common/hmaps"
+	"github.com/gohugoio/hugo/common/hstrings"
 	"github.com/gohugoio/hugo/common/htime"
 	"github.com/gohugoio/hugo/common/hugo"
 	"github.com/gohugoio/hugo/common/loggers"
-	"github.com/gohugoio/hugo/common/maps"
 	"github.com/gohugoio/hugo/common/paths"
 	"github.com/gohugoio/hugo/common/terminal"
 	"github.com/gohugoio/hugo/common/types"
@@ -142,7 +144,7 @@ func (c *hugoBuilder) getDirList() ([]string, error) {
 		return nil, err
 	}
 
-	return helpers.UniqueStringsSorted(h.PathSpec.BaseFs.WatchFilenames()), nil
+	return hstrings.UniqueStringsSorted(h.PathSpec.BaseFs.WatchFilenames()), nil
 }
 
 func (c *hugoBuilder) initCPUProfile() (func(), error) {
@@ -462,7 +464,15 @@ func (c *hugoBuilder) copyStaticTo(sourceFs *filesystems.SourceFilesystem) (uint
 		infol.Logf("removing all files from destination that don't exist in static dirs")
 
 		syncer.DeleteFilter = func(f fsync.FileInfo) bool {
-			return f.IsDir() && strings.HasPrefix(f.Name(), ".")
+			name := f.Name()
+
+			// Keep .gitignore and .gitattributes anywhere
+			if name == ".gitignore" || name == ".gitattributes" {
+				return true
+			}
+
+			// Keep Hugo's original dot-directory behavior
+			return f.IsDir() && strings.HasPrefix(name, ".")
 		}
 	}
 	start := time.Now()
@@ -515,6 +525,14 @@ func (c *hugoBuilder) doWithPublishDirs(f func(sourceFs *filesystems.SourceFiles
 	return langCount, nil
 }
 
+func (c *hugoBuilder) progressIntermediate() {
+	terminal.ReportProgress(c.r.StdOut, terminal.ProgressIntermediate, 0)
+}
+
+func (c *hugoBuilder) progressHidden() {
+	terminal.ReportProgress(c.r.StdOut, terminal.ProgressHidden, 0)
+}
+
 func (c *hugoBuilder) fullBuild(noBuildLock bool) error {
 	var (
 		g         errgroup.Group
@@ -663,7 +681,20 @@ func (c *hugoBuilder) handleEvents(watcher *watcher.Batcher,
 	var n int
 	for _, ev := range evs {
 		keep := true
-		if ev.Has(fsnotify.Create) || ev.Has(fsnotify.Write) {
+		// Write and rename operations are often followed by CHMOD.
+		// There may be valid use cases for rebuilding the site on CHMOD,
+		// but that will require more complex logic than this simple conditional.
+		// On OS X this seems to be related to Spotlight, see:
+		// https://github.com/go-fsnotify/fsnotify/issues/15
+		// A workaround is to put your site(s) on the Spotlight exception list,
+		// but that may be a little mysterious for most end users.
+		// So, for now, we skip reload on CHMOD.
+		// We do have to check for WRITE though. On slower laptops a Chmod
+		// could be aggregated with other important events, and we still want
+		// to rebuild on those
+		if ev.Op == fsnotify.Chmod {
+			keep = false
+		} else if ev.Has(fsnotify.Create) || ev.Has(fsnotify.Write) {
 			if _, err := os.Stat(ev.Name); err != nil {
 				keep = false
 			}
@@ -805,22 +836,7 @@ func (c *hugoBuilder) handleEvents(watcher *watcher.Batcher,
 			continue
 		}
 
-		// Write and rename operations are often followed by CHMOD.
-		// There may be valid use cases for rebuilding the site on CHMOD,
-		// but that will require more complex logic than this simple conditional.
-		// On OS X this seems to be related to Spotlight, see:
-		// https://github.com/go-fsnotify/fsnotify/issues/15
-		// A workaround is to put your site(s) on the Spotlight exception list,
-		// but that may be a little mysterious for most end users.
-		// So, for now, we skip reload on CHMOD.
-		// We do have to check for WRITE though. On slower laptops a Chmod
-		// could be aggregated with other important events, and we still want
-		// to rebuild on those
-		if ev.Op&(fsnotify.Chmod|fsnotify.Write|fsnotify.Create) == fsnotify.Chmod {
-			continue
-		}
-
-		walkAdder := func(path string, f hugofs.FileMetaInfo) error {
+		walkAdder := func(ctx context.Context, path string, f hugofs.FileMetaInfo) error {
 			if f.IsDir() {
 				c.r.logger.Println("adding created directory to watchlist", path)
 				if err := watcher.Add(path); err != nil {
@@ -964,7 +980,7 @@ func (c *hugoBuilder) handleEvents(watcher *watcher.Batcher,
 					lrl.Logf("no page to navigate to, force refresh")
 					livereload.ForceRefresh()
 				}
-			} else if len(otherChanges) > 0 {
+			} else if len(otherChanges) > 0 || len(cssChanges) > 0 {
 				if len(otherChanges) == 1 {
 					// Allow single changes to be refreshed without a full page reload.
 					pathToRefresh := h.PathSpec.RelURL(paths.ToSlashTrimLeading(otherChanges[0]), false)
@@ -974,6 +990,9 @@ func (c *hugoBuilder) handleEvents(watcher *watcher.Batcher,
 					lrl.Logf("force refresh")
 					livereload.ForceRefresh()
 				}
+			} else {
+				lrl.Logf("force refresh")
+				livereload.ForceRefresh()
 			}
 
 			if len(cssChanges) > 0 {
@@ -1026,6 +1045,17 @@ func (c *hugoBuilder) hugoTry() *hugolib.HugoSites {
 }
 
 func (c *hugoBuilder) loadConfig(cd *simplecobra.Commandeer, running bool) error {
+	if terminal.PrintANSIColors(os.Stdout) {
+		defer c.progressHidden()
+		// If the configuration takes a while to load, we want to show some progress.
+		// This is typically loading of external modules.
+		d := debounce.New(500 * time.Millisecond)
+		d(func() {
+			c.progressIntermediate()
+		})
+		defer d(func() {})
+	}
+
 	cfg := config.New()
 	cfg.Set("renderToMemory", c.r.renderToMemory)
 	watch := c.r.buildWatch || (c.s != nil && c.s.serverWatch)
@@ -1047,7 +1077,7 @@ func (c *hugoBuilder) loadConfig(cd *simplecobra.Commandeer, running bool) error
 	}
 	cfg.Set("environment", c.r.environment)
 
-	cfg.Set("internal", maps.Params{
+	cfg.Set("internal", hmaps.Params{
 		"running":        running,
 		"watch":          watch,
 		"verbose":        c.r.isVerbose(),

commands/import.go

@@ -29,9 +29,9 @@ import (
 	"unicode"
 
 	"github.com/bep/simplecobra"
+	"github.com/gohugoio/hugo/common/hmaps"
 	"github.com/gohugoio/hugo/common/htime"
 	"github.com/gohugoio/hugo/common/hugio"
-	"github.com/gohugoio/hugo/common/maps"
 	"github.com/gohugoio/hugo/helpers"
 	"github.com/gohugoio/hugo/hugofs"
 	"github.com/gohugoio/hugo/parser"
@@ -190,7 +190,7 @@ func (c *importCommand) createSiteFromJekyll(jekyllRoot, targetDir string, jekyl
 }
 
 func (c *importCommand) convertJekyllContent(m any, content string) (string, error) {
-	metadata, _ := maps.ToStringMapE(m)
+	metadata, _ := hmaps.ToStringMapE(m)
 
 	lines := strings.Split(content, "\n")
 	var resultLines []string
@@ -246,7 +246,7 @@ func (c *importCommand) convertJekyllContent(m any, content string) (string, err
 }
 
 func (c *importCommand) convertJekyllMetaData(m any, postName string, postDate time.Time, draft bool) (any, error) {
-	metadata, err := maps.ToStringMapE(m)
+	metadata, err := hmaps.ToStringMapE(m)
 	if err != nil {
 		return nil, err
 	}
@@ -427,7 +427,7 @@ func (c *importCommand) importFromJekyll(args []string) error {
 	c.r.Println("Importing...")
 
 	fileCount := 0
-	callback := func(path string, fi hugofs.FileMetaInfo) error {
+	callback := func(ctx context.Context, path string, fi hugofs.FileMetaInfo) error {
 		if fi.IsDir() {
 			return nil
 		}

commands/mod.go

@@ -44,16 +44,16 @@ func newModCommands() *modCommands {
 
 	npmCommand := &simpleCommand{
 		name:  "npm",
-		short: "Various npm helpers.",
+		short: "Various npm helpers",
 		long:  `Various npm (Node package manager) helpers.`,
 		commands: []simplecobra.Commander{
 			&simpleCommand{
 				name:  "pack",
-				short: "Experimental: Prepares and writes a composite package.json file for your project.",
+				short: "Experimental: Prepares and writes a composite package.json file for your project",
 				long: `Prepares and writes a composite package.json file for your project.
 
 On first run it creates a "package.hugo.json" in the project root if not already there. This file will be used as a template file
-with the base dependency set. 
+with the base dependency set.
 
 This set will be merged with all "package.hugo.json" files found in the dependency tree, picking the version closest to the project.
 
@@ -80,12 +80,12 @@ so this may/will change in future versions of Hugo.
 		commands: []simplecobra.Commander{
 			&simpleCommand{
 				name:  "init",
-				short: "Initialize this project as a Hugo Module.",
+				short: "Initialize this project as a Hugo Module",
 				long: `Initialize this project as a Hugo Module.
 	It will try to guess the module path, but you may help by passing it as an argument, e.g:
-	
+
 		hugo mod init github.com/gohugoio/testshortcodes
-	
+
 	Note that Hugo Modules supports multi-module projects, so you can initialize a Hugo Module
 	inside a subfolder on GitHub, as one example.
 	`,
@@ -111,7 +111,7 @@ so this may/will change in future versions of Hugo.
 			},
 			&simpleCommand{
 				name:  "verify",
-				short: "Verify dependencies.",
+				short: "Verify dependencies",
 				long:  `Verify checks that the dependencies of the current module, which are stored in a local downloaded source cache, have not been modified since being downloaded.`,
 				withc: func(cmd *cobra.Command, r *rootCommand) {
 					cmd.ValidArgsFunction = cobra.NoFileCompletions
@@ -129,7 +129,7 @@ so this may/will change in future versions of Hugo.
 			},
 			&simpleCommand{
 				name:  "graph",
-				short: "Print a module dependency graph.",
+				short: "Print a module dependency graph",
 				long: `Print a module dependency graph with information about module status (disabled, vendored).
 Note that for vendored modules, that is the version listed and not the one from go.mod.
 `,
@@ -149,7 +149,7 @@ Note that for vendored modules, that is the version listed and not the one from
 			},
 			&simpleCommand{
 				name:  "clean",
-				short: "Delete the Hugo Module cache for the current project.",
+				short: "Delete the Hugo Module cache for the current project",
 				long:  `Delete the Hugo Module cache for the current project.`,
 				withc: func(cmd *cobra.Command, r *rootCommand) {
 					cmd.ValidArgsFunction = cobra.NoFileCompletions
@@ -175,7 +175,7 @@ Note that for vendored modules, that is the version listed and not the one from
 			},
 			&simpleCommand{
 				name:  "tidy",
-				short: "Remove unused entries in go.mod and go.sum.",
+				short: "Remove unused entries in go.mod and go.sum",
 				withc: func(cmd *cobra.Command, r *rootCommand) {
 					cmd.ValidArgsFunction = cobra.NoFileCompletions
 					applyLocalFlagsBuildConfig(cmd, r)
@@ -190,7 +190,7 @@ Note that for vendored modules, that is the version listed and not the one from
 			},
 			&simpleCommand{
 				name:  "vendor",
-				short: "Vendor all module dependencies into the _vendor directory.",
+				short: "Vendor all module dependencies into the _vendor directory",
 				long: `Vendor all module dependencies into the _vendor directory.
 	If a module is vendored, that is where Hugo will look for it's dependencies.
 	`,
@@ -209,16 +209,16 @@ Note that for vendored modules, that is the version listed and not the one from
 
 			&simpleCommand{
 				name:  "get",
-				short: "Resolves dependencies in your current Hugo Project.",
+				short: "Resolves dependencies in your current Hugo project",
 				long: `
-Resolves dependencies in your current Hugo Project.
+Resolves dependencies in your current Hugo project.
 
 Some examples:
 
 Install the latest version possible for a given module:
 
     hugo mod get github.com/gohugoio/testshortcodes
-    
+
 Install a specific version:
 
     hugo mod get github.com/gohugoio/testshortcodes@v0.3.0

commands/new.go

@@ -53,7 +53,9 @@ Ensure you run this within the root directory of your site.`,
 					if len(args) < 1 {
 						return newUserError("path needs to be provided")
 					}
-					h, err := r.Hugo(flagsToCfg(cd, nil))
+					cfg := flagsToCfg(cd, nil)
+					cfg.Set("BuildFuture", true)
+					h, err := r.Hugo(cfg)
 					if err != nil {
 						return err
 					}
@@ -76,10 +78,8 @@ Ensure you run this within the root directory of your site.`,
 			&simpleCommand{
 				name:  "site",
 				use:   "site [path]",
-				short: "Create a new site (skeleton)",
-				long: `Create a new site in the provided directory.
-The new site will have the correct structure, but no content or theme yet.
-Use ` + "`hugo new [contentPath]`" + ` to create new content.`,
+				short: "Create a new site",
+				long:  `Create a new site at the specified path.`,
 				run: func(ctx context.Context, cd *simplecobra.Commandeer, r *rootCommand, args []string) error {
 					if len(args) < 1 {
 						return newUserError("path needs to be provided")
@@ -124,11 +124,9 @@ Use ` + "`hugo new [contentPath]`" + ` to create new content.`,
 			&simpleCommand{
 				name:  "theme",
 				use:   "theme [name]",
-				short: "Create a new theme (skeleton)",
-				long: `Create a new theme (skeleton) called [name] in ./themes.
-New theme is a skeleton. Please add content to the touched files. Add your
-name to the copyright line in the license and adjust the theme.toml file
-according to your needs.`,
+				short: "Create a new theme",
+				long: `Create a new theme with the specified name in the ./themes directory.
+This generates a functional theme including template examples and sample content.`,
 				run: func(ctx context.Context, cd *simplecobra.Commandeer, r *rootCommand, args []string) error {
 					if len(args) < 1 {
 						return newUserError("theme name needs to be provided")
@@ -144,7 +142,7 @@ according to your needs.`,
 					createpath := paths.AbsPathify(conf.configs.Base.WorkingDir, filepath.Join(conf.configs.Base.ThemesDir, args[0]))
 					r.Println("Creating new theme in", createpath)
 
-					err = skeletons.CreateTheme(createpath, sourceFs)
+					err = skeletons.CreateTheme(createpath, sourceFs, format)
 					if err != nil {
 						return err
 					}
@@ -152,7 +150,14 @@ according to your needs.`,
 					return nil
 				},
 				withc: func(cmd *cobra.Command, r *rootCommand) {
-					cmd.ValidArgsFunction = cobra.NoFileCompletions
+					cmd.ValidArgsFunction = func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+						if len(args) != 0 {
+							return []string{}, cobra.ShellCompDirectiveNoFileComp
+						}
+						return []string{}, cobra.ShellCompDirectiveNoFileComp | cobra.ShellCompDirectiveFilterDirs
+					}
+					cmd.Flags().StringVar(&format, "format", "toml", "preferred file format (toml, yaml or json)")
+					_ = cmd.RegisterFlagCompletionFunc("format", cobra.FixedCompletions([]string{"toml", "yaml", "json"}, cobra.ShellCompDirectiveNoFileComp))
 				},
 			},
 		},

commands/release.go

@@ -32,7 +32,7 @@ func newReleaseCommand() simplecobra.Commander {
 
 	return &simpleCommand{
 		name:  "release",
-		short: "Release a new version of Hugo.",
+		short: "Release a new version of Hugo",
 		run: func(ctx context.Context, cd *simplecobra.Commandeer, r *rootCommand, args []string) error {
 			rel, err := releaser.New(skipPush, try, step)
 			if err != nil {

commands/server.go

@@ -23,6 +23,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"maps"
 	"net"
 	"net/http"
 	_ "net/http/pprof"
@@ -48,6 +49,9 @@ import (
 	"github.com/fsnotify/fsnotify"
 	"github.com/gohugoio/hugo/common/herrors"
 	"github.com/gohugoio/hugo/common/hugo"
+	"github.com/gohugoio/hugo/common/paths"
+	"github.com/gohugoio/hugo/langs"
+	"github.com/gohugoio/hugo/tpl/tplimpl"
 
 	"github.com/gohugoio/hugo/common/types"
 	"github.com/gohugoio/hugo/common/urls"
@@ -57,7 +61,6 @@ import (
 	"github.com/gohugoio/hugo/hugolib"
 	"github.com/gohugoio/hugo/hugolib/filesystems"
 	"github.com/gohugoio/hugo/livereload"
-	"github.com/gohugoio/hugo/tpl"
 	"github.com/gohugoio/hugo/transform"
 	"github.com/gohugoio/hugo/transform/livereloadinject"
 	"github.com/spf13/afero"
@@ -84,6 +87,10 @@ const (
 	configChangeGoWork = "go work file"
 )
 
+const (
+	hugoHeaderRedirect = "X-Hugo-Redirect"
+)
+
 func newHugoBuilder(r *rootCommand, s *serverCommand, onConfigLoaded ...func(reloaded bool) error) *hugoBuilder {
 	var visitedURLs *types.EvictingQueue[string]
 	if s != nil && !s.disableFastRender {
@@ -115,7 +122,7 @@ func newServerCommand() *serverCommand {
 		commands: []simplecobra.Commander{
 			&simpleCommand{
 				name:  "trust",
-				short: "Install the local CA in the system trust store.",
+				short: "Install the local CA in the system trust store",
 				run: func(ctx context.Context, cd *simplecobra.Commandeer, r *rootCommand, args []string) error {
 					action := "-install"
 					if uninstall {
@@ -191,9 +198,7 @@ func (f *fileChangeDetector) PrepareNew() {
 	}
 
 	f.prev = make(map[string]uint64)
-	for k, v := range f.current {
-		f.prev[k] = v
-	}
+	maps.Copy(f.prev, f.current)
 	f.current = make(map[string]uint64)
 }
 
@@ -307,67 +312,71 @@ func (f *fileServer) createEndpoint(i int) (*http.ServeMux, net.Listener, string
 				w.Header().Set(header.Key, header.Value)
 			}
 
-			if redirect := serverConfig.MatchRedirect(requestURI); !redirect.IsZero() {
-				// fullName := filepath.Join(dir, filepath.FromSlash(path.Clean("/"+name)))
-				doRedirect := true
-				// This matches Netlify's behavior and is needed for SPA behavior.
-				// See https://docs.netlify.com/routing/redirects/rewrites-proxies/
-				if !redirect.Force {
-					path := filepath.Clean(strings.TrimPrefix(requestURI, baseURL.Path()))
-					if root != "" {
-						path = filepath.Join(root, path)
-					}
-					var fs afero.Fs
-					f.c.withConf(func(conf *commonConfig) {
-						fs = conf.fs.PublishDirServer
-					})
-
-					fi, err := fs.Stat(path)
-
-					if err == nil {
-						if fi.IsDir() {
-							// There will be overlapping directories, so we
-							// need to check for a file.
-							_, err = fs.Stat(filepath.Join(path, "index.html"))
-							doRedirect = err != nil
-						} else {
-							doRedirect = false
+			if canRedirect(requestURI, r) {
+				if redirect := serverConfig.MatchRedirect(requestURI, r.Header); !redirect.IsZero() {
+					doRedirect := true
+					// This matches Netlify's behavior and is needed for SPA behavior.
+					// See https://docs.netlify.com/routing/redirects/rewrites-proxies/
+					if !redirect.Force {
+						path := filepath.Clean(strings.TrimPrefix(requestURI, baseURL.Path()))
+						if root != "" {
+							path = filepath.Join(root, path)
 						}
-					}
-				}
+						var fs afero.Fs
+						f.c.withConf(func(conf *commonConfig) {
+							fs = conf.fs.PublishDirServer
+						})
+
+						fi, err := fs.Stat(path)
 
-				if doRedirect {
-					switch redirect.Status {
-					case 404:
-						w.WriteHeader(404)
-						file, err := fs.Open(strings.TrimPrefix(redirect.To, baseURL.Path()))
 						if err == nil {
-							defer file.Close()
-							io.Copy(w, file)
-						} else {
-							fmt.Fprintln(w, "<h1>Page Not Found</h1>")
+							if fi.IsDir() {
+								// There will be overlapping directories, so we
+								// need to check for a file.
+								_, err = fs.Stat(filepath.Join(path, "index.html"))
+								doRedirect = err != nil
+							} else {
+								doRedirect = false
+							}
 						}
-						return
-					case 200:
-						if r2 := f.rewriteRequest(r, strings.TrimPrefix(redirect.To, baseURL.Path())); r2 != nil {
-							requestURI = redirect.To
-							r = r2
-						}
-					default:
-						w.Header().Set("Content-Type", "")
-						http.Redirect(w, r, redirect.To, redirect.Status)
-						return
+					}
 
+					if doRedirect {
+						w.Header().Set(hugoHeaderRedirect, "true")
+						switch redirect.Status {
+						case 404:
+							w.WriteHeader(404)
+							file, err := fs.Open(strings.TrimPrefix(redirect.To, baseURL.Path()))
+							if err == nil {
+								defer file.Close()
+								io.Copy(w, file)
+							} else {
+								fmt.Fprintln(w, "<h1>Page Not Found</h1>")
+							}
+							return
+						case 200:
+							if r2 := f.rewriteRequest(r, strings.TrimPrefix(redirect.To, baseURL.Path())); r2 != nil {
+								requestURI = redirect.To
+								r = r2
+							}
+						default:
+							w.Header().Set("Content-Type", "")
+							http.Redirect(w, r, redirect.To, redirect.Status)
+							return
+
+						}
 					}
 				}
-
 			}
 
 			if f.c.fastRenderMode && f.c.errState.buildErr() == nil {
-				// Sec-Fetch-Mode should be sent by all recent browser versions, see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Mode#navigate
-				// Fall back to the file extension if not set.
-				// The main take here is that we don't want to have CSS/JS files etc. partake in this logic.
-				if r.Header.Get("Sec-Fetch-Mode") == "navigate" || strings.HasSuffix(requestURI, "/") || strings.HasSuffix(requestURI, "html") || strings.HasSuffix(requestURI, "htm") {
+				if isNavigation(requestURI, r) {
+					// See issue 14240.
+					// Hugo escapes the URL paths when generating them,
+					// that may not be the case when we receive it back from the browser.
+					// PathEscape will escape if it is not already escaped.
+					requestURI = paths.PathEscape(requestURI)
+
 					if !f.c.visitedURLs.Contains(requestURI) {
 						// If not already on stack, re-render that single page.
 						if err := f.c.partialReRender(requestURI); err != nil {
@@ -490,9 +499,7 @@ func (c *serverCommand) Run(ctx context.Context, cd *simplecobra.Commandeer, arg
 
 		watchGroups := helpers.ExtractAndGroupRootPaths(watchDirs)
 
-		for _, group := range watchGroups {
-			c.r.Printf("Watching for changes in %s\n", group)
-		}
+		c.r.Printf("Watching for changes in %s\n", strings.Join(watchGroups, ", "))
 		watcher, err := c.newWatcher(c.r.poll, watchDirs...)
 		if err != nil {
 			return err
@@ -757,7 +764,7 @@ func (c *serverCommand) createServerPorts(cd *simplecobra.Commandeer) error {
 			c.serverPorts = make([]serverPortListener, len(conf.configs.Languages))
 		}
 		currentServerPort := c.serverPort
-		for i := 0; i < len(c.serverPorts); i++ {
+		for i := range c.serverPorts {
 			l, err := net.Listen("tcp", net.JoinHostPort(c.serverInterface, strconv.Itoa(currentServerPort)))
 			if err == nil {
 				c.serverPorts[i] = serverPortListener{ln: l, p: currentServerPort}
@@ -878,7 +885,7 @@ func (c *serverCommand) serve() error {
 		if isMultihost {
 			for _, l := range conf.configs.ConfigLangs() {
 				baseURLs = append(baseURLs, l.BaseURL())
-				roots = append(roots, l.Language().Lang)
+				roots = append(roots, l.Language().(*langs.Language).Lang)
 			}
 		} else {
 			l := conf.configs.GetFirstLanguageConfig()
@@ -896,16 +903,16 @@ func (c *serverCommand) serve() error {
 	// To allow the en user to change the error template while the server is running, we use
 	// the freshest template we can provide.
 	var (
-		errTempl     tpl.Template
-		templHandler tpl.TemplateHandler
+		errTempl     *tplimpl.TemplInfo
+		templHandler *tplimpl.TemplateStore
 	)
-	getErrorTemplateAndHandler := func(h *hugolib.HugoSites) (tpl.Template, tpl.TemplateHandler) {
+	getErrorTemplateAndHandler := func(h *hugolib.HugoSites) (*tplimpl.TemplInfo, *tplimpl.TemplateStore) {
 		if h == nil {
 			return errTempl, templHandler
 		}
-		templHandler := h.Tmpl()
-		errTempl, found := templHandler.Lookup("_server/error.html")
-		if !found {
+		templHandler := h.GetTemplateStore()
+		errTempl := templHandler.LookupByPath("/_server/error.html")
+		if errTempl == nil {
 			panic("template server/error.html not found")
 		}
 		return errTempl, templHandler
@@ -1033,7 +1040,6 @@ func (c *serverCommand) serve() error {
 	defer cancel()
 	wg2, ctx := errgroup.WithContext(ctx)
 	for _, srv := range servers {
-		srv := srv
 		wg2.Go(func() error {
 			return srv.Shutdown(ctx)
 		})
@@ -1165,7 +1171,6 @@ func chmodFilter(dst, src os.FileInfo) bool {
 }
 
 func cleanErrorLog(content string) string {
-	content = strings.ReplaceAll(content, "\n", " ")
 	content = logReplacer.Replace(content)
 	content = logDuplicateTemplateExecuteRe.ReplaceAllString(content, "")
 	content = logDuplicateTemplateParseRe.ReplaceAllString(content, "")
@@ -1233,3 +1238,24 @@ func formatByteCount(b uint64) string {
 	return fmt.Sprintf("%.1f %cB",
 		float64(b)/float64(div), "kMGTPE"[exp])
 }
+
+func canRedirect(requestURIWithoutQuery string, r *http.Request) bool {
+	if r.Header.Get(hugoHeaderRedirect) != "" {
+		return false
+	}
+	return isNavigation(requestURIWithoutQuery, r)
+}
+
+// Sec-Fetch-Mode should be sent by all recent browser versions, see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Mode#navigate
+// Fall back to the file extension if not set.
+// The main take here is that we don't want to have CSS/JS files etc. partake in this logic.
+func isNavigation(requestURIWithoutQuery string, r *http.Request) bool {
+	return r.Header.Get("Sec-Fetch-Mode") == "navigate" || isPropablyHTMLRequest(requestURIWithoutQuery)
+}
+
+func isPropablyHTMLRequest(requestURIWithoutQuery string) bool {
+	if strings.HasSuffix(requestURIWithoutQuery, "/") || strings.HasSuffix(requestURIWithoutQuery, "html") || strings.HasSuffix(requestURIWithoutQuery, "htm") {
+		return true
+	}
+	return !strings.Contains(requestURIWithoutQuery, ".")
+}

common/collections/append.go

@@ -16,6 +16,8 @@ package collections
 import (
 	"fmt"
 	"reflect"
+
+	"github.com/gohugoio/hugo/common/hreflect"
 )
 
 // Append appends from to a slice to and returns the resulting slice.
@@ -25,7 +27,7 @@ func Append(to any, from ...any) (any, error) {
 	if len(from) == 0 {
 		return to, nil
 	}
-	tov, toIsNil := indirect(reflect.ValueOf(to))
+	tov, toIsNil := hreflect.Indirect(reflect.ValueOf(to))
 
 	toIsNil = toIsNil || to == nil
 	var tot reflect.Type
@@ -100,7 +102,7 @@ func Append(to any, from ...any) (any, error) {
 		fv := reflect.ValueOf(f)
 		if !fv.IsValid() || !fv.Type().AssignableTo(tot) {
 			// Fall back to a []interface{} slice.
-			tov, _ := indirect(reflect.ValueOf(to))
+			tov, _ := hreflect.Indirect(reflect.ValueOf(to))
 			return appendToInterfaceSlice(tov, from...)
 		}
 		tov = reflect.Append(tov, fv)
@@ -117,7 +119,7 @@ func appendToInterfaceSliceFromValues(slice1, slice2 reflect.Value) ([]any, erro
 			tos = append(tos, nil)
 			continue
 		}
-		for i := 0; i < slice.Len(); i++ {
+		for i := range slice.Len() {
 			tos = append(tos, slice.Index(i).Interface())
 		}
 	}
@@ -128,7 +130,7 @@ func appendToInterfaceSliceFromValues(slice1, slice2 reflect.Value) ([]any, erro
 func appendToInterfaceSlice(tov reflect.Value, from ...any) ([]any, error) {
 	var tos []any
 
-	for i := 0; i < tov.Len(); i++ {
+	for i := range tov.Len() {
 		tos = append(tos, tov.Index(i).Interface())
 	}
 
@@ -136,17 +138,3 @@ func appendToInterfaceSlice(tov reflect.Value, from ...any) ([]any, error) {
 
 	return tos, nil
 }
-
-// indirect is borrowed from the Go stdlib: 'text/template/exec.go'
-// TODO(bep) consolidate
-func indirect(v reflect.Value) (rv reflect.Value, isNil bool) {
-	for ; v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface; v = v.Elem() {
-		if v.IsNil() {
-			return v, true
-		}
-		if v.Kind() == reflect.Interface && v.NumMethod() > 0 {
-			break
-		}
-	}
-	return v, false
-}

common/collections/append_test.go

@@ -77,6 +77,7 @@ func TestAppend(t *testing.T) {
 		{[]string{"a", "b"}, []any{nil}, []any{"a", "b", nil}},
 		{[]string{"a", "b"}, []any{nil, "d", nil}, []any{"a", "b", nil, "d", nil}},
 		{[]any{"a", nil, "c"}, []any{"d", nil, "f"}, []any{"a", nil, "c", "d", nil, "f"}},
+		{[]string{"a", "b"}, []any{}, []string{"a", "b"}},
 	} {
 
 		result, err := Append(test.start, test.addend...)

common/collections/slice_test.go

@@ -136,3 +136,37 @@ func TestSortedStringSlice(t *testing.T) {
 	c.Assert(s.Count("z"), qt.Equals, 0)
 	c.Assert(s.Count("a"), qt.Equals, 1)
 }
+
+func TestStringSliceToInterfaceSlice(t *testing.T) {
+	t.Parallel()
+	c := qt.New(t)
+
+	tests := []struct {
+		name string
+		in   []string
+		want []any
+	}{
+		{
+			name: "empty slice",
+			in:   []string{},
+			want: []any{},
+		},
+		{
+			name: "single element",
+			in:   []string{"hello"},
+			want: []any{"hello"},
+		},
+		{
+			name: "multiple elements",
+			in:   []string{"a", "b", "c"},
+			want: []any{"a", "b", "c"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := StringSliceToInterfaceSlice(tt.in)
+			c.Assert(got, qt.DeepEquals, tt.want)
+		})
+	}
+}

common/collections/stack.go

@@ -13,26 +13,32 @@
 
 package collections
 
-import "sync"
+import (
+	"iter"
+	"slices"
+	"sync"
 
-// Stack is a simple LIFO stack that is safe for concurrent use.
-type Stack[T any] struct {
+	"github.com/gohugoio/hugo/common/hiter"
+)
+
+// StackThreadSafe is a simple LIFO stack that is safe for concurrent use.
+type StackThreadSafe[T any] struct {
 	items []T
 	zero  T
 	mu    sync.RWMutex
 }
 
-func NewStack[T any]() *Stack[T] {
-	return &Stack[T]{}
+func NewStackThreadSafe[T any]() *StackThreadSafe[T] {
+	return &StackThreadSafe[T]{}
 }
 
-func (s *Stack[T]) Push(item T) {
+func (s *StackThreadSafe[T]) Push(item T) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	s.items = append(s.items, item)
 }
 
-func (s *Stack[T]) Pop() (T, bool) {
+func (s *StackThreadSafe[T]) Pop() (T, bool) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	if len(s.items) == 0 {
@@ -43,7 +49,7 @@ func (s *Stack[T]) Pop() (T, bool) {
 	return item, true
 }
 
-func (s *Stack[T]) Peek() (T, bool) {
+func (s *StackThreadSafe[T]) Peek() (T, bool) {
 	s.mu.RLock()
 	defer s.mu.RUnlock()
 	if len(s.items) == 0 {
@@ -52,13 +58,18 @@ func (s *Stack[T]) Peek() (T, bool) {
 	return s.items[len(s.items)-1], true
 }
 
-func (s *Stack[T]) Len() int {
+func (s *StackThreadSafe[T]) Len() int {
 	s.mu.RLock()
 	defer s.mu.RUnlock()
 	return len(s.items)
 }
 
-func (s *Stack[T]) Drain() []T {
+// All returns all items in the stack, from bottom to top.
+func (s *StackThreadSafe[T]) All() iter.Seq2[int, T] {
+	return hiter.Lock2(slices.All(s.items), s.mu.RLock, s.mu.RUnlock)
+}
+
+func (s *StackThreadSafe[T]) Drain() []T {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	items := s.items
@@ -66,15 +77,59 @@ func (s *Stack[T]) Drain() []T {
 	return items
 }
 
-func (s *Stack[T]) DrainMatching(predicate func(T) bool) []T {
+func (s *StackThreadSafe[T]) DrainMatching(predicate func(T) bool) []T {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	var items []T
 	for i := len(s.items) - 1; i >= 0; i-- {
 		if predicate(s.items[i]) {
 			items = append(items, s.items[i])
-			s.items = append(s.items[:i], s.items[i+1:]...)
+			s.items = slices.Delete(s.items, i, i+1)
 		}
 	}
 	return items
 }
+
+// Stack is a simple LIFO stack that is not safe for concurrent use.
+type Stack[T any] struct {
+	items []T
+	zero  T
+}
+
+func NewStack[T any]() *Stack[T] {
+	return &Stack[T]{}
+}
+
+func (s *Stack[T]) Push(item T) {
+	s.items = append(s.items, item)
+}
+
+func (s *Stack[T]) Pop() (T, bool) {
+	if len(s.items) == 0 {
+		return s.zero, false
+	}
+	item := s.items[len(s.items)-1]
+	s.items = s.items[:len(s.items)-1]
+	return item, true
+}
+
+func (s *Stack[T]) Peek() (T, bool) {
+	if len(s.items) == 0 {
+		return s.zero, false
+	}
+	return s.items[len(s.items)-1], true
+}
+
+func (s *Stack[T]) Len() int {
+	return len(s.items)
+}
+
+func (s *Stack[T]) All() iter.Seq2[int, T] {
+	return slices.All(s.items)
+}
+
+func (s *Stack[T]) Drain() []T {
+	items := s.items
+	s.items = nil
+	return items
+}

common/collections/stack_test.go

@@ -0,0 +1,77 @@
+package collections
+
+import (
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestNewStack(t *testing.T) {
+	t.Parallel()
+	c := qt.New(t)
+
+	s := NewStackThreadSafe[int]()
+
+	c.Assert(s, qt.IsNotNil)
+}
+
+func TestStackBasic(t *testing.T) {
+	t.Parallel()
+	c := qt.New(t)
+
+	s := NewStackThreadSafe[int]()
+
+	c.Assert(s.Len(), qt.Equals, 0)
+
+	s.Push(1)
+	s.Push(2)
+	s.Push(3)
+
+	c.Assert(s.Len(), qt.Equals, 3)
+
+	top, ok := s.Peek()
+	c.Assert(ok, qt.Equals, true)
+	c.Assert(top, qt.Equals, 3)
+
+	popped, ok := s.Pop()
+	c.Assert(ok, qt.Equals, true)
+	c.Assert(popped, qt.Equals, 3)
+
+	c.Assert(s.Len(), qt.Equals, 2)
+
+	_, _ = s.Pop()
+	_, _ = s.Pop()
+	_, ok = s.Pop()
+
+	c.Assert(ok, qt.Equals, false)
+}
+
+func TestStackDrain(t *testing.T) {
+	t.Parallel()
+	c := qt.New(t)
+
+	s := NewStackThreadSafe[string]()
+	s.Push("a")
+	s.Push("b")
+
+	got := s.Drain()
+
+	c.Assert(got, qt.DeepEquals, []string{"a", "b"})
+	c.Assert(s.Len(), qt.Equals, 0)
+}
+
+func TestStackDrainMatching(t *testing.T) {
+	t.Parallel()
+	c := qt.New(t)
+
+	s := NewStackThreadSafe[int]()
+	s.Push(1)
+	s.Push(2)
+	s.Push(3)
+	s.Push(4)
+
+	got := s.DrainMatching(func(v int) bool { return v%2 == 0 })
+
+	c.Assert(got, qt.DeepEquals, []int{4, 2})
+	c.Assert(s.Drain(), qt.DeepEquals, []int{1, 3})
+}

common/constants/constants.go

@@ -23,6 +23,8 @@ const (
 	WarnFrontMatterParamsOverrides = "warning-frontmatter-params-overrides"
 	WarnRenderShortcodesInHTML     = "warning-rendershortcodes-in-html"
 	WarnGoldmarkRawHTML            = "warning-goldmark-raw-html"
+	WarnPartialSuperfluousPrefix   = "warning-partial-superfluous-prefix"
+	WarnHomePageIsLeafBundle       = "warning-home-page-is-leaf-bundle"
 )
 
 // Field/method names with special meaning.

common/hashing/hashing.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/cespare/xxhash/v2"
 	"github.com/gohugoio/hashstructure"
+	"github.com/gohugoio/hugo/common/hugio"
 	"github.com/gohugoio/hugo/identity"
 )
 
@@ -38,6 +39,34 @@ func XXHashFromReader(r io.Reader) (uint64, int64, error) {
 	return h.Sum64(), size, nil
 }
 
+type Hasher interface {
+	io.StringWriter
+	io.Writer
+	io.ReaderFrom
+	Sum64() uint64
+}
+
+type HashCloser interface {
+	Hasher
+	io.Closer
+}
+
+// XxHasher returns a Hasher that uses xxHash.
+// Remember to call Close when done.
+func XxHasher() HashCloser {
+	h := getXxHashReadFrom()
+	return struct {
+		Hasher
+		io.Closer
+	}{
+		Hasher: h,
+		Closer: hugio.CloserFunc(func() error {
+			putXxHashReadFrom(h)
+			return nil
+		}),
+	}
+}
+
 // XxHashFromReaderHexEncoded calculates the xxHash for the given reader
 // and returns the hash as a hex encoded string.
 func XxHashFromReaderHexEncoded(r io.Reader) (string, error) {
@@ -58,11 +87,13 @@ func XXHashFromString(s string) (uint64, error) {
 	return h.Sum64(), nil
 }
 
-// XxHashFromStringHexEncoded calculates the xxHash for the given string
+// XxHashFromStringHexEncoded calculates the xxHash for the given strings
 // and returns the hash as a hex encoded string.
-func XxHashFromStringHexEncoded(f string) string {
+func XxHashFromStringHexEncoded(s ...string) string {
 	h := xxhash.New()
-	h.WriteString(f)
+	for _, f := range s {
+		h.WriteString(f)
+	}
 	hash := h.Sum(nil)
 	return hex.EncodeToString(hash)
 }

common/hashing/hashing_test.go

@@ -37,12 +37,11 @@ func TestXxHashFromReaderPara(t *testing.T) {
 	c := qt.New(t)
 
 	var wg sync.WaitGroup
-	for i := 0; i < 10; i++ {
-		i := i
+	for i := range 10 {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			for j := 0; j < 100; j++ {
+			for j := range 100 {
 				s := strings.Repeat("Hello ", i+j+1*42)
 				r := strings.NewReader(s)
 				got, size, err := XXHashFromReader(r)
@@ -75,8 +74,8 @@ func TestXxHashFromStringHexEncoded(t *testing.T) {
 
 func BenchmarkXXHashFromReader(b *testing.B) {
 	r := strings.NewReader("Hello World")
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+
+	for b.Loop() {
 		XXHashFromReader(r)
 		r.Seek(0, 0)
 	}
@@ -84,16 +83,16 @@ func BenchmarkXXHashFromReader(b *testing.B) {
 
 func BenchmarkXXHashFromString(b *testing.B) {
 	s := "Hello World"
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+
+	for b.Loop() {
 		XXHashFromString(s)
 	}
 }
 
 func BenchmarkXXHashFromStringHexEncoded(b *testing.B) {
 	s := "The quick brown fox jumps over the lazy dog"
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+
+	for b.Loop() {
 		XxHashFromStringHexEncoded(s)
 	}
 }
@@ -136,7 +135,7 @@ func BenchmarkHashString(b *testing.B) {
 
 	for _, test := range tests {
 		b.Run(fmt.Sprintf("n%d", len(test)), func(b *testing.B) {
-			for i := 0; i < b.N; i++ {
+			for b.Loop() {
 				HashString(test)
 			}
 		})
@@ -144,14 +143,12 @@ func BenchmarkHashString(b *testing.B) {
 }
 
 func BenchmarkHashMap(b *testing.B) {
-	m := map[string]interface{}{}
-	for i := 0; i < 1000; i++ {
+	m := map[string]any{}
+	for i := range 1000 {
 		m[fmt.Sprintf("key%d", i)] = i
 	}
 
-	b.ResetTimer()
-
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		HashString(m)
 	}
 }

common/hcontext/context.go

@@ -1,46 +0,0 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package hcontext
-
-import "context"
-
-// ContextDispatcher is a generic interface for setting and getting values from a context.
-type ContextDispatcher[T any] interface {
-	Set(ctx context.Context, value T) context.Context
-	Get(ctx context.Context) T
-}
-
-// NewContextDispatcher creates a new ContextDispatcher with the given key.
-func NewContextDispatcher[T any, R comparable](key R) ContextDispatcher[T] {
-	return keyInContext[T, R]{
-		id: key,
-	}
-}
-
-type keyInContext[T any, R comparable] struct {
-	zero T
-	id   R
-}
-
-func (f keyInContext[T, R]) Get(ctx context.Context) T {
-	v := ctx.Value(f.id)
-	if v == nil {
-		return f.zero
-	}
-	return v.(T)
-}
-
-func (f keyInContext[T, R]) Set(ctx context.Context, value T) context.Context {
-	return context.WithValue(ctx, f.id, value)
-}

common/hdebug/debug.go

@@ -0,0 +1,61 @@
+// Copyright 2025 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hdebug
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/gohugoio/hugo/common/types"
+	"github.com/gohugoio/hugo/htesting"
+)
+
+// Printf is a debug print function that should be removed before committing code to the repository.
+func Printf(format string, args ...any) {
+	panicIfRealCI()
+	if len(args) == 1 && !strings.Contains(format, "%") {
+		format = format + ": %v"
+	}
+	if !strings.HasSuffix(format, "\n") {
+		format = format + "\n"
+	}
+	fmt.Printf(format, args...)
+}
+
+func AssertNotNil(a ...any) {
+	panicIfRealCI()
+	for _, v := range a {
+		if types.IsNil(v) {
+			panic("hdebug.AssertNotNil: value is nil")
+		}
+	}
+}
+
+func Panicf(format string, args ...any) {
+	panicIfRealCI()
+	// fmt.Println(stack())
+	if len(args) == 1 && !strings.Contains(format, "%") {
+		format = format + ": %v"
+	}
+	if !strings.HasSuffix(format, "\n") {
+		format = format + "\n"
+	}
+	panic(fmt.Sprintf(format, args...))
+}
+
+func panicIfRealCI() {
+	if htesting.IsRealCI() {
+		panic("This debug statement should be removed before committing code!")
+	}
+}

common/herrors/error_locator.go

@@ -152,10 +152,7 @@ func locateError(r io.Reader, le FileError, matches LineMatcherFn) *ErrorContext
 	}
 
 	if ectx.Position.LineNumber > 0 {
-		low := ectx.Position.LineNumber - 3
-		if low < 0 {
-			low = 0
-		}
+		low := max(ectx.Position.LineNumber-3, 0)
 
 		if ectx.Position.LineNumber > 2 {
 			ectx.LinesPos = 2
@@ -163,10 +160,7 @@ func locateError(r io.Reader, le FileError, matches LineMatcherFn) *ErrorContext
 			ectx.LinesPos = ectx.Position.LineNumber - 1
 		}
 
-		high := ectx.Position.LineNumber + 2
-		if high > len(lines) {
-			high = len(lines)
-		}
+		high := min(ectx.Position.LineNumber+2, len(lines))
 
 		ectx.Lines = lines[low:high]
 

common/herrors/errors.go

@@ -17,22 +17,13 @@ package herrors
 import (
 	"errors"
 	"fmt"
-	"io"
 	"os"
 	"regexp"
 	"runtime"
-	"runtime/debug"
 	"strings"
 	"time"
 )
 
-// PrintStackTrace prints the current stacktrace to w.
-func PrintStackTrace(w io.Writer) {
-	buf := make([]byte, 1<<16)
-	runtime.Stack(buf, true)
-	fmt.Fprintf(w, "%s", buf)
-}
-
 // ErrorSender is a, typically, non-blocking error handler.
 type ErrorSender interface {
 	SendError(err error)
@@ -45,7 +36,9 @@ type ErrorSender interface {
 func Recover(args ...any) {
 	if r := recover(); r != nil {
 		fmt.Println("ERR:", r)
-		args = append(args, "stacktrace from panic: \n"+string(debug.Stack()), "\n")
+		buf := make([]byte, 64<<10)
+		buf = buf[:runtime.Stack(buf, false)]
+		args = append(args, "stacktrace from panic: \n"+string(buf), "\n")
 		fmt.Println(args...)
 	}
 }

common/herrors/file_error.go

@@ -110,11 +110,11 @@ func (fe *fileError) UpdateContent(r io.Reader, linematcher LineMatcherFn) FileE
 
 	fe.errorContext = ectx
 
-	if ectx.Position.LineNumber > 0 {
+	if ectx.Position.LineNumber > 0 && ectx.Position.LineNumber > fe.position.LineNumber {
 		fe.position.LineNumber = ectx.Position.LineNumber
 	}
 
-	if ectx.Position.ColumnNumber > 0 {
+	if ectx.Position.ColumnNumber > 0 && ectx.Position.ColumnNumber > fe.position.ColumnNumber {
 		fe.position.ColumnNumber = ectx.Position.ColumnNumber
 	}
 
@@ -177,6 +177,7 @@ func NewFileErrorFromName(err error, name string) FileError {
 	// Filetype is used to determine the Chroma lexer to use.
 	fileType, pos := extractFileTypePos(err)
 	pos.Filename = name
+
 	if fileType == "" {
 		_, fileType = paths.FileAndExtNoDelimiter(filepath.Clean(name))
 	}
@@ -234,7 +235,9 @@ func NewFileErrorFromFile(err error, filename string, fs afero.Fs, linematcher L
 		return NewFileErrorFromName(err, realFilename)
 	}
 	defer f.Close()
-	return NewFileErrorFromName(err, realFilename).UpdateContent(f, linematcher)
+	fe := NewFileErrorFromName(err, realFilename)
+	fe = fe.UpdateContent(f, linematcher)
+	return fe
 }
 
 func openFile(filename string, fs afero.Fs) (afero.File, string, error) {
@@ -285,6 +288,50 @@ func Unwrap(err error) error {
 	return err
 }
 
+// UnwrapFileErrors returns all FileError contained in err.
+func UnwrapFileErrors(err error) []FileError {
+	if err == nil {
+		return nil
+	}
+	errs := Errors(err)
+	var fileErrors []FileError
+	for _, e := range errs {
+		if v, ok := e.(FileError); ok {
+			fileErrors = append(fileErrors, v)
+		}
+		fileErrors = append(fileErrors, UnwrapFileErrors(errors.Unwrap(e))...)
+	}
+	return fileErrors
+}
+
+// UnwrapFileErrorsWithErrorContext tries to unwrap all FileError in err that has an ErrorContext.
+func UnwrapFileErrorsWithErrorContext(err error) []FileError {
+	errs := UnwrapFileErrors(err)
+	var n int
+	for _, e := range errs {
+		if e.ErrorContext() != nil {
+			errs[n] = e
+			n++
+		}
+	}
+	return errs[:n]
+}
+
+// Errors returns the list of errors contained in err.
+func Errors(err error) []error {
+	if err == nil {
+		return nil
+	}
+
+	type unwrapper interface {
+		Unwrap() []error
+	}
+	if u, ok := err.(unwrapper); ok {
+		return u.Unwrap()
+	}
+	return []error{err}
+}
+
 func extractFileTypePos(err error) (string, text.Position) {
 	err = Unwrap(err)
 
@@ -321,13 +368,9 @@ func extractFileTypePos(err error) (string, text.Position) {
 	}
 
 	// Look in the error message for the line number.
-	for _, handle := range lineNumberExtractors {
-		lno, col := handle(err)
-		if lno > 0 {
-			pos.ColumnNumber = col
-			pos.LineNumber = lno
-			break
-		}
+	if lno, col := commonLineNumberExtractor(err); lno > 0 {
+		pos.ColumnNumber = col
+		pos.LineNumber = lno
 	}
 
 	if fileType == "" && pos.Filename != "" {
@@ -351,30 +394,6 @@ func UnwrapFileError(err error) FileError {
 	return nil
 }
 
-// UnwrapFileErrors tries to unwrap all FileError.
-func UnwrapFileErrors(err error) []FileError {
-	var errs []FileError
-	for err != nil {
-		if v, ok := err.(FileError); ok {
-			errs = append(errs, v)
-		}
-		err = errors.Unwrap(err)
-	}
-	return errs
-}
-
-// UnwrapFileErrorsWithErrorContext tries to unwrap all FileError in err that has an ErrorContext.
-func UnwrapFileErrorsWithErrorContext(err error) []FileError {
-	var errs []FileError
-	for err != nil {
-		if v, ok := err.(FileError); ok && v.ErrorContext() != nil {
-			errs = append(errs, v)
-		}
-		err = errors.Unwrap(err)
-	}
-	return errs
-}
-
 func extractOffsetAndType(e error) (int, string) {
 	switch v := e.(type) {
 	case *json.UnmarshalTypeError:

common/herrors/line_number_extractors.go

@@ -19,17 +19,27 @@ import (
 )
 
 var lineNumberExtractors = []lineNumberExtractor{
+	// YAML parse errors.
+	newLineNumberErrHandlerFromRegexp(`\[(\d+):(\d+)\]`),
+
 	// Template/shortcode parse errors
 	newLineNumberErrHandlerFromRegexp(`:(\d+):(\d*):`),
 	newLineNumberErrHandlerFromRegexp(`:(\d+):`),
 
-	// YAML parse errors
-	newLineNumberErrHandlerFromRegexp(`line (\d+):`),
-
 	// i18n bundle errors
 	newLineNumberErrHandlerFromRegexp(`\((\d+),\s(\d*)`),
 }
 
+func commonLineNumberExtractor(e error) (int, int) {
+	for _, handler := range lineNumberExtractors {
+		lno, col := handler(e)
+		if lno > 0 {
+			return lno, col
+		}
+	}
+	return 0, 0
+}
+
 type lineNumberExtractor func(e error) (int, int)
 
 func newLineNumberErrHandlerFromRegexp(expression string) lineNumberExtractor {

common/herrors/line_number_extractors_test.go

@@ -1,4 +1,4 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
+// Copyright 2025 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,27 +11,21 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package doctree
+package herrors
 
 import (
+	"errors"
 	"testing"
 
 	qt "github.com/frankban/quicktest"
 )
 
-func TestDimensionFlag(t *testing.T) {
+func TestCommonLineNumberExtractor(t *testing.T) {
+	t.Parallel()
+
 	c := qt.New(t)
 
-	var zero DimensionFlag
-	var d DimensionFlag
-	var o DimensionFlag = 1
-	var p DimensionFlag = 12
-
-	c.Assert(d.Has(o), qt.Equals, false)
-	d = d.Set(o)
-	c.Assert(d.Has(o), qt.Equals, true)
-	c.Assert(d.Has(d), qt.Equals, true)
-	c.Assert(func() { zero.Index() }, qt.PanicMatches, "dimension flag not set")
-	c.Assert(DimensionLanguage.Index(), qt.Equals, 0)
-	c.Assert(p.Index(), qt.Equals, 11)
+	lno, col := commonLineNumberExtractor(errors.New("[4:9] value is not allowed in this context"))
+	c.Assert(lno, qt.Equals, 4)
+	c.Assert(col, qt.Equals, 9)
 }

common/hexec/exec.go

@@ -27,9 +27,8 @@ import (
 	"sync"
 
 	"github.com/bep/logg"
-	"github.com/cli/safeexec"
+	"github.com/gohugoio/hugo/common/hmaps"
 	"github.com/gohugoio/hugo/common/loggers"
-	"github.com/gohugoio/hugo/common/maps"
 	"github.com/gohugoio/hugo/config"
 	"github.com/gohugoio/hugo/config/security"
 )
@@ -103,7 +102,7 @@ func New(cfg security.Config, workingDir string, log loggers.Logger) *Exec {
 		workingDir:        workingDir,
 		infol:             log.InfoCommand("exec"),
 		baseEnviron:       baseEnviron,
-		newNPXRunnerCache: maps.NewCache[string, func(arg ...any) (Runner, error)](),
+		newNPXRunnerCache: hmaps.NewCache[string, func(arg ...any) (Runner, error)](),
 	}
 }
 
@@ -113,18 +112,6 @@ func IsNotFound(err error) bool {
 	return errors.As(err, &notFoundErr)
 }
 
-// SafeCommand is a wrapper around os/exec Command which uses a LookPath
-// implementation that does not search in current directory before looking in PATH.
-// See https://github.com/cli/safeexec and the linked issues.
-func SafeCommand(name string, arg ...string) (*exec.Cmd, error) {
-	bin, err := safeexec.LookPath(name)
-	if err != nil {
-		return nil, err
-	}
-
-	return exec.Command(bin, arg...), nil
-}
-
 // Exec enforces a security policy for commands run via os/exec.
 type Exec struct {
 	sc         security.Config
@@ -134,7 +121,7 @@ type Exec struct {
 	// os.Environ filtered by the Exec.OsEnviron whitelist filter.
 	baseEnviron []string
 
-	newNPXRunnerCache *maps.Cache[string, func(arg ...any) (Runner, error)]
+	newNPXRunnerCache *hmaps.Cache[string, func(arg ...any) (Runner, error)]
 	npxInit           sync.Once
 	npxAvailable      bool
 }
@@ -197,7 +184,7 @@ func (e *Exec) Npx(name string, arg ...any) (Runner, error) {
 		tryFuncs := map[binaryLocation]tryFunc{
 			binaryLocationNodeModules: func() func(...any) (Runner, error) {
 				nodeBinFilename := filepath.Join(e.workingDir, nodeModulesBinPath, name)
-				_, err := safeexec.LookPath(nodeBinFilename)
+				_, err := exec.LookPath(nodeBinFilename)
 				if err != nil {
 					return nil
 				}
@@ -215,7 +202,7 @@ func (e *Exec) Npx(name string, arg ...any) (Runner, error) {
 				}
 			},
 			binaryLocationPath: func() func(...any) (Runner, error) {
-				if _, err := safeexec.LookPath(name); err != nil {
+				if _, err := exec.LookPath(name); err != nil {
 					return nil
 				}
 				return func(arg2 ...any) (Runner, error) {
@@ -346,7 +333,7 @@ func (c *commandeer) command(arg ...any) (*cmdWrapper, error) {
 		bin = c.fullyQualifiedName
 	} else {
 		var err error
-		bin, err = safeexec.LookPath(c.name)
+		bin, err = exec.LookPath(c.name)
 		if err != nil {
 			return nil, &NotFoundError{
 				name:   c.name,
@@ -384,7 +371,7 @@ func InPath(binaryName string) bool {
 	if strings.Contains(binaryName, "/") {
 		panic("binary name should not contain any slash")
 	}
-	_, err := safeexec.LookPath(binaryName)
+	_, err := exec.LookPath(binaryName)
 	return err == nil
 }
 
@@ -394,7 +381,7 @@ func LookPath(binaryName string) string {
 	if strings.Contains(binaryName, "/") {
 		panic("binary name should not contain any slash")
 	}
-	s, err := safeexec.LookPath(binaryName)
+	s, err := exec.LookPath(binaryName)
 	if err != nil {
 		return ""
 	}

common/himage/image.go

@@ -0,0 +1,67 @@
+// Copyright 2025 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package himage provides some high level image types and interfaces.
+package himage
+
+import "image"
+
+// AnimatedImage represents an animated image.
+// This is currently supported for GIF and WebP images.
+type AnimatedImage interface {
+	image.Image        // The first frame.
+	GetRaw() any       // *gif.GIF or *WEBP.
+	GetLoopCount() int // Number of times to loop the animation. 0 means infinite.
+	ImageFrames
+}
+
+// ImageFrames provides access to the frames of an animated image.
+type ImageFrames interface {
+	GetFrames() []image.Image
+
+	// Frame durations in milliseconds.
+	// Note that Gif frame durations are in 100ths of a second,
+	// so they need to be multiplied by 10 to get milliseconds and vice versa.
+	GetFrameDurations() []int
+
+	SetFrames(frames []image.Image)
+	SetWidthHeight(width, height int)
+}
+
+// ImageConfigProvider provides access to the image.Config of an image.
+type ImageConfigProvider interface {
+	GetImageConfig() image.Config
+}
+
+// FrameDurationsToGifDelays converts frame durations in milliseconds to
+// GIF delays in 100ths of a second.
+func FrameDurationsToGifDelays(frameDurations []int) []int {
+	delays := make([]int, len(frameDurations))
+	for i, fd := range frameDurations {
+		delays[i] = fd / 10
+		if delays[i] == 0 && fd > 0 {
+			delays[i] = 1
+		}
+	}
+	return delays
+}
+
+// GifDelaysToFrameDurations converts GIF delays in 100ths of a second to
+// frame durations in milliseconds.
+func GifDelaysToFrameDurations(delays []int) []int {
+	frameDurations := make([]int, len(delays))
+	for i, d := range delays {
+		frameDurations[i] = d * 10
+	}
+	return frameDurations
+}

common/hiter/iter.go

@@ -0,0 +1,66 @@
+package hiter
+
+// Common iterator functions.
+// Some of these are are based on this discsussion: https://github.com/golang/go/issues/61898
+
+import "iter"
+
+// Concat returns an iterator over the concatenation of the sequences.
+// Any nil sequences are ignored.
+func Concat[V any](seqs ...iter.Seq[V]) iter.Seq[V] {
+	return func(yield func(V) bool) {
+		for _, seq := range seqs {
+			if seq == nil {
+				continue
+			}
+			for e := range seq {
+				if !yield(e) {
+					return
+				}
+			}
+		}
+	}
+}
+
+// Concat2 returns an iterator over the concatenation of the sequences.
+// Any nil sequences are ignored.
+func Concat2[K, V any](seqs ...iter.Seq2[K, V]) iter.Seq2[K, V] {
+	return func(yield func(K, V) bool) {
+		for _, seq := range seqs {
+			if seq == nil {
+				continue
+			}
+			for k, v := range seq {
+				if !yield(k, v) {
+					return
+				}
+			}
+		}
+	}
+}
+
+// Lock returns an iterator that locks before iterating and unlocks after.
+func Lock[V any](seq iter.Seq[V], lock, unlock func()) iter.Seq[V] {
+	return func(yield func(V) bool) {
+		lock()
+		defer unlock()
+		for e := range seq {
+			if !yield(e) {
+				return
+			}
+		}
+	}
+}
+
+// Lock2 returns an iterator that locks before iterating and unlocks after.
+func Lock2[K, V any](seq iter.Seq2[K, V], lock, unlock func()) iter.Seq2[K, V] {
+	return func(yield func(K, V) bool) {
+		lock()
+		defer unlock()
+		for k, v := range seq {
+			if !yield(k, v) {
+				return
+			}
+		}
+	}
+}

common/hmaps/cache.go

@@ -1,4 +1,4 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
+// Copyright 2026 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package maps
+package hmaps
 
 import (
 	"sync"
@@ -20,13 +20,27 @@ import (
 // Cache is a simple thread safe cache backed by a map.
 type Cache[K comparable, T any] struct {
 	m                  map[K]T
+	opts               CacheOptions
 	hasBeenInitialized bool
 	sync.RWMutex
 }
 
-// NewCache creates a new Cache.
+// CacheOptions are the options for the Cache.
+type CacheOptions struct {
+	// If set, the cache will not grow beyond this size.
+	Size uint64
+}
+
+var defaultCacheOptions = CacheOptions{}
+
+// NewCache creates a new Cache with default options.
 func NewCache[K comparable, T any]() *Cache[K, T] {
-	return &Cache[K, T]{m: make(map[K]T)}
+	return &Cache[K, T]{m: make(map[K]T), opts: defaultCacheOptions}
+}
+
+// NewCacheWithOptions creates a new Cache with the given options.
+func NewCacheWithOptions[K comparable, T any](opts CacheOptions) *Cache[K, T] {
+	return &Cache[K, T]{m: make(map[K]T), opts: opts}
 }
 
 // Delete deletes the given key from the cache.
@@ -65,10 +79,19 @@ func (c *Cache[K, T]) GetOrCreate(key K, create func() (T, error)) (T, error) {
 	if err != nil {
 		return v, err
 	}
+	c.clearIfNeeded()
 	c.m[key] = v
 	return v, nil
 }
 
+// Contains returns whether the given key exists in the cache.
+func (c *Cache[K, T]) Contains(key K) bool {
+	c.RLock()
+	_, found := c.m[key]
+	c.RUnlock()
+	return found
+}
+
 // InitAndGet initializes the cache if not already done and returns the value for the given key.
 // The init state will be reset on Reset or Drain.
 func (c *Cache[K, T]) InitAndGet(key K, init func(get func(key K) (T, bool), set func(key K, value T)) error) (T, error) {
@@ -108,7 +131,26 @@ func (c *Cache[K, T]) Set(key K, value T) {
 	c.Unlock()
 }
 
+// SetIfAbsent sets the given key to the given value if the key does not already exist in the cache.
+func (c *Cache[K, T]) SetIfAbsent(key K, value T) {
+	c.RLock()
+	if _, found := c.get(key); !found {
+		c.RUnlock()
+		c.Set(key, value)
+	} else {
+		c.RUnlock()
+	}
+}
+
+func (c *Cache[K, T]) clearIfNeeded() {
+	if c.opts.Size > 0 && uint64(len(c.m)) >= c.opts.Size {
+		// clear the map
+		clear(c.m)
+	}
+}
+
 func (c *Cache[K, T]) set(key K, value T) {
+	c.clearIfNeeded()
 	c.m[key] = value
 }
 
@@ -141,7 +183,7 @@ func (c *Cache[K, T]) Len() int {
 
 func (c *Cache[K, T]) Reset() {
 	c.Lock()
-	c.m = make(map[K]T)
+	clear(c.m)
 	c.hasBeenInitialized = false
 	c.Unlock()
 }

common/hmaps/cache_test.go

@@ -0,0 +1,57 @@
+// Copyright 2026 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hmaps
+
+import (
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestCacheSize(t *testing.T) {
+	c := qt.New(t)
+
+	cache := NewCacheWithOptions[string, string](CacheOptions{Size: 10})
+
+	for i := range 30 {
+		cache.Set(string(rune('a'+i)), "value")
+	}
+
+	c.Assert(len(cache.m), qt.Equals, 10)
+
+	for i := 20; i < 50; i++ {
+		cache.GetOrCreate(string(rune('a'+i)), func() (string, error) {
+			return "value", nil
+		})
+	}
+
+	c.Assert(len(cache.m), qt.Equals, 10)
+
+	for i := 100; i < 200; i++ {
+		cache.SetIfAbsent(string(rune('a'+i)), "value")
+	}
+
+	c.Assert(len(cache.m), qt.Equals, 10)
+
+	cache.InitAndGet("foo", func(
+		get func(key string) (string, bool), set func(key string, value string),
+	) error {
+		for i := 50; i < 100; i++ {
+			set(string(rune('a'+i)), "value")
+		}
+		return nil
+	})
+
+	c.Assert(len(cache.m), qt.Equals, 10)
+}

common/hmaps/map.go

@@ -0,0 +1,129 @@
+// Copyright 2026 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hmaps
+
+import (
+	"iter"
+	"sync"
+)
+
+func NewMap[K comparable, T any]() *Map[K, T] {
+	return &Map[K, T]{
+		m: make(map[K]T),
+	}
+}
+
+// Map is a thread safe map backed by a Go map.
+type Map[K comparable, T any] struct {
+	m  map[K]T
+	mu sync.RWMutex
+}
+
+// Get gets the value for the given key.
+// It returns the zero value of T if the key is not found.
+func (m *Map[K, T]) Get(key K) T {
+	v, _ := m.Lookup(key)
+	return v
+}
+
+// Lookup looks up the given key in the map.
+// It returns the value and a boolean indicating whether the key was found.
+func (m *Map[K, T]) Lookup(key K) (T, bool) {
+	m.mu.RLock()
+	v, found := m.m[key]
+	m.mu.RUnlock()
+	return v, found
+}
+
+// GetOrCreate gets the value for the given key if it exists, or creates it if not.
+func (m *Map[K, T]) GetOrCreate(key K, create func() (T, error)) (T, error) {
+	v, found := m.Lookup(key)
+	if found {
+		return v, nil
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	v, found = m.m[key]
+	if found {
+		return v, nil
+	}
+	v, err := create()
+	if err != nil {
+		return v, err
+	}
+	m.m[key] = v
+	return v, nil
+}
+
+// Set sets the given key to the given value.
+func (m *Map[K, T]) Set(key K, value T) {
+	m.mu.Lock()
+	m.m[key] = value
+	m.mu.Unlock()
+}
+
+// Delete deletes the given key from the map.
+// It returns true if the key was found and deleted, false otherwise.
+func (m *Map[K, T]) Delete(key K) bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if _, found := m.m[key]; found {
+		delete(m.m, key)
+		return true
+	}
+	return false
+}
+
+// WithWriteLock executes the given function with a write lock on the map.
+func (m *Map[K, T]) WithWriteLock(f func(m map[K]T) error) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return f(m.m)
+}
+
+// SetIfAbsent sets the given key to the given value if the key does not already exist in the map.
+// It returns true if the value was set, false otherwise.
+func (m *Map[K, T]) SetIfAbsent(key K, value T) bool {
+	m.mu.RLock()
+	if _, found := m.m[key]; !found {
+		m.mu.RUnlock()
+		return m.doSetIfAbsent(key, value)
+	}
+	m.mu.RUnlock()
+	return false
+}
+
+func (m *Map[K, T]) doSetIfAbsent(key K, value T) bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if _, found := m.m[key]; !found {
+		m.m[key] = value
+		return true
+	}
+	return false
+}
+
+// All returns an iterator over all key/value pairs in the map.
+// A read lock is held during the iteration.
+func (m *Map[K, T]) All() iter.Seq2[K, T] {
+	return func(yield func(K, T) bool) {
+		m.mu.RLock()
+		defer m.mu.RUnlock()
+		for k, v := range m.m {
+			if !yield(k, v) {
+				return
+			}
+		}
+	}
+}

common/hmaps/map_test.go

@@ -0,0 +1,72 @@
+// Copyright 2026 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hmaps
+
+import (
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestMap(t *testing.T) {
+	c := qt.New(t)
+
+	m := NewMap[string, int]()
+
+	m.Set("b", 42)
+	v, found := m.Lookup("b")
+	c.Assert(found, qt.Equals, true)
+	c.Assert(v, qt.Equals, 42)
+	v = m.Get("b")
+	c.Assert(v, qt.Equals, 42)
+	v, found = m.Lookup("c")
+	c.Assert(found, qt.Equals, false)
+	c.Assert(v, qt.Equals, 0)
+	v = m.Get("c")
+	c.Assert(v, qt.Equals, 0)
+	v, err := m.GetOrCreate("d", func() (int, error) {
+		return 100, nil
+	})
+	c.Assert(err, qt.IsNil)
+	c.Assert(v, qt.Equals, 100)
+	v, found = m.Lookup("d")
+	c.Assert(found, qt.Equals, true)
+	c.Assert(v, qt.Equals, 100)
+
+	v, err = m.GetOrCreate("d", func() (int, error) {
+		return 200, nil
+	})
+	c.Assert(err, qt.IsNil)
+	c.Assert(v, qt.Equals, 100)
+
+	wasSet := m.SetIfAbsent("e", 300)
+	c.Assert(wasSet, qt.Equals, true)
+	v, found = m.Lookup("e")
+	c.Assert(found, qt.Equals, true)
+	c.Assert(v, qt.Equals, 300)
+
+	wasSet = m.SetIfAbsent("e", 400)
+	c.Assert(wasSet, qt.Equals, false)
+	v, found = m.Lookup("e")
+	c.Assert(found, qt.Equals, true)
+	c.Assert(v, qt.Equals, 300)
+
+	m.WithWriteLock(func(m map[string]int) error {
+		m["f"] = 500
+		return nil
+	})
+	v, found = m.Lookup("f")
+	c.Assert(found, qt.Equals, true)
+	c.Assert(v, qt.Equals, 500)
+}

common/hmaps/maps.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2026 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package maps
+package hmaps
 
 import (
 	"fmt"
@@ -98,6 +98,8 @@ func ToSliceStringMap(in any) ([]map[string]any, error) {
 		return v, nil
 	case Params:
 		return []map[string]any{v}, nil
+	case map[string]any:
+		return []map[string]any{v}, nil
 	case []any:
 		var s []map[string]any
 		for _, entry := range v {

common/hmaps/maps_test.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2026 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package maps
+package hmaps
 
 import (
 	"fmt"
@@ -73,10 +73,14 @@ func TestPrepareParams(t *testing.T) {
 	for i, test := range tests {
 		t.Run(fmt.Sprint(i), func(t *testing.T) {
 			// PrepareParams modifies input.
+			prepareClone := PrepareParamsClone(test.input)
 			PrepareParams(test.input)
 			if !reflect.DeepEqual(test.expected, test.input) {
 				t.Errorf("[%d] Expected\n%#v, got\n%#v\n", i, test.expected, test.input)
 			}
+			if !reflect.DeepEqual(test.expected, prepareClone) {
+				t.Errorf("[%d] Expected\n%#v, got\n%#v\n", i, test.expected, prepareClone)
+			}
 		})
 	}
 }

common/hmaps/ordered.go

@@ -1,4 +1,4 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
+// Copyright 2026 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,9 +11,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package maps
+package hmaps
 
 import (
+	"slices"
+
 	"github.com/gohugoio/hugo/common/hashing"
 )
 
@@ -56,6 +58,15 @@ func (m *Ordered[K, T]) Get(key K) (T, bool) {
 	return value, found
 }
 
+// Has returns whether the given key exists in the map.
+func (m *Ordered[K, T]) Has(key K) bool {
+	if m == nil {
+		return false
+	}
+	_, found := m.values[key]
+	return found
+}
+
 // Delete deletes the value for the given key.
 func (m *Ordered[K, T]) Delete(key K) {
 	if m == nil {
@@ -64,7 +75,7 @@ func (m *Ordered[K, T]) Delete(key K) {
 	delete(m.values, key)
 	for i, k := range m.keys {
 		if k == key {
-			m.keys = append(m.keys[:i], m.keys[i+1:]...)
+			m.keys = slices.Delete(m.keys, i, i+1)
 			break
 		}
 	}

common/hmaps/ordered_test.go

@@ -1,4 +1,4 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
+// Copyright 2026 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package maps
+package hmaps
 
 import (
 	"testing"

common/hmaps/orderedintset.go

@@ -0,0 +1,154 @@
+// Copyright 2026 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hmaps
+
+import (
+	"fmt"
+	"slices"
+
+	"github.com/bits-and-blooms/bitset"
+)
+
+type OrderedIntSet struct {
+	keys   []int
+	values *bitset.BitSet
+}
+
+// NewOrderedIntSet creates a new OrderedIntSet.
+// Note that this is backed by https://github.com/bits-and-blooms/bitset
+func NewOrderedIntSet(vals ...int) *OrderedIntSet {
+	m := &OrderedIntSet{
+		keys:   make([]int, 0, len(vals)),
+		values: bitset.New(uint(len(vals))),
+	}
+	for _, v := range vals {
+		m.Set(v)
+	}
+	return m
+}
+
+// Set sets the value for the given key.
+// Note that insertion order is not affected if a key is re-inserted into the set.
+func (m *OrderedIntSet) Set(key int) {
+	if m == nil {
+		panic("nil OrderedIntSet")
+	}
+	keyu := uint(key)
+	if m.values.Test(keyu) {
+		return
+	}
+	m.values.Set(keyu)
+	m.keys = append(m.keys, key)
+}
+
+// SetFrom sets the values from another OrderedIntSet.
+func (m *OrderedIntSet) SetFrom(other *OrderedIntSet) {
+	if m == nil || other == nil {
+		return
+	}
+	for _, key := range other.keys {
+		m.Set(key)
+	}
+}
+
+func (m *OrderedIntSet) Clone() *OrderedIntSet {
+	if m == nil {
+		return nil
+	}
+	newSet := &OrderedIntSet{
+		keys:   slices.Clone(m.keys),
+		values: m.values.Clone(),
+	}
+	return newSet
+}
+
+// Next returns the next key in the set possibly including the given key.
+// It returns -1 if the key is not found or if there are no keys greater than the given key.
+func (m *OrderedIntSet) Next(i int) int {
+	n, ok := m.values.NextSet(uint(i))
+	if !ok {
+		return -1
+	}
+	return int(n)
+}
+
+// The reason we don't use iter.Seq is https://github.com/golang/go/issues/69015
+// This is 70% faster than using iter.Seq2[int, int] for the keys.
+// It returns false if the iteration was stopped early.
+func (m *OrderedIntSet) ForEachKey(yield func(int) bool) bool {
+	if m == nil {
+		return true
+	}
+	for _, key := range m.keys {
+		if !yield(key) {
+			return false
+		}
+	}
+	return true
+}
+
+func (m *OrderedIntSet) Has(key int) bool {
+	if m == nil {
+		return false
+	}
+	return m.values.Test(uint(key))
+}
+
+func (m *OrderedIntSet) Len() int {
+	if m == nil {
+		return 0
+	}
+	return len(m.keys)
+}
+
+// KeysSorted returns the keys in sorted order.
+func (m *OrderedIntSet) KeysSorted() []int {
+	if m == nil {
+		return nil
+	}
+	keys := slices.Clone(m.keys)
+	slices.Sort(keys)
+	return m.keys
+}
+
+func (m *OrderedIntSet) String() string {
+	if m == nil {
+		return "[]"
+	}
+	return fmt.Sprintf("%v", m.keys)
+}
+
+func (m *OrderedIntSet) Values() *bitset.BitSet {
+	if m == nil {
+		return nil
+	}
+	return m.values
+}
+
+func (m *OrderedIntSet) IsSuperSet(other *OrderedIntSet) bool {
+	if m == nil || other == nil {
+		return false
+	}
+	return m.values.IsSuperSet(other.values)
+}
+
+// Words returns the bitset as array of 64-bit words, giving direct access to the internal representation.
+// It is not a copy, so changes to the returned slice will affect the bitset.
+// It is meant for advanced users.
+func (m *OrderedIntSet) Words() []uint64 {
+	if m == nil {
+		return nil
+	}
+	return m.values.Words()
+}

common/hmaps/orderedintset_test.go

@@ -0,0 +1,117 @@
+// Copyright 2026 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hmaps
+
+import (
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestOrderedIntSet(t *testing.T) {
+	c := qt.New(t)
+
+	m := NewOrderedIntSet(2, 1, 3, 7)
+
+	c.Assert(m.Len(), qt.Equals, 4)
+	c.Assert(m.Has(1), qt.Equals, true)
+	c.Assert(m.Has(4), qt.Equals, false)
+	c.Assert(m.String(), qt.Equals, "[2 1 3 7]")
+	m.Set(4)
+	c.Assert(m.Len(), qt.Equals, 5)
+	c.Assert(m.Has(4), qt.Equals, true)
+	c.Assert(m.Next(0), qt.Equals, 1)
+	c.Assert(m.Next(1), qt.Equals, 1)
+	c.Assert(m.Next(2), qt.Equals, 2)
+	c.Assert(m.Next(3), qt.Equals, 3)
+	c.Assert(m.Next(4), qt.Equals, 4)
+	c.Assert(m.Next(7), qt.Equals, 7)
+	c.Assert(m.Next(8), qt.Equals, -1)
+	c.Assert(m.String(), qt.Equals, "[2 1 3 7 4]")
+
+	var nilset *OrderedIntSet
+	c.Assert(nilset.Len(), qt.Equals, 0)
+	c.Assert(nilset.Has(1), qt.Equals, false)
+	c.Assert(nilset.String(), qt.Equals, "[]")
+
+	var collected []int
+	m.ForEachKey(func(key int) bool {
+		collected = append(collected, key)
+		return true
+	})
+	c.Assert(collected, qt.DeepEquals, []int{2, 1, 3, 7, 4})
+}
+
+func BenchmarkOrderedIntSet(b *testing.B) {
+	smallSet := NewOrderedIntSet()
+	for i := range 8 {
+		smallSet.Set(i)
+	}
+	mediumSet := NewOrderedIntSet()
+	for i := range 64 {
+		mediumSet.Set(i)
+	}
+	largeSet := NewOrderedIntSet()
+	for i := range 1024 {
+		largeSet.Set(i)
+	}
+
+	b.Run("New", func(b *testing.B) {
+		for b.Loop() {
+			NewOrderedIntSet(1, 2, 3, 4, 5, 6, 7, 8)
+		}
+	})
+
+	b.Run("Has small", func(b *testing.B) {
+		for i := 0; b.Loop(); i++ {
+			smallSet.Has(i % 32)
+		}
+	})
+
+	b.Run("Has medium", func(b *testing.B) {
+		for i := 0; b.Loop(); i++ {
+			mediumSet.Has(i % 32)
+		}
+	})
+
+	b.Run("Next", func(b *testing.B) {
+		for i := 0; b.Loop(); i++ {
+			mediumSet.Next(i % 32)
+		}
+	})
+
+	b.Run("ForEachKey small", func(b *testing.B) {
+		for b.Loop() {
+			smallSet.ForEachKey(func(key int) bool {
+				return true
+			})
+		}
+	})
+
+	b.Run("ForEachKey medium", func(b *testing.B) {
+		for b.Loop() {
+			mediumSet.ForEachKey(func(key int) bool {
+				return true
+			})
+		}
+	})
+
+	b.Run("ForEachKey large", func(b *testing.B) {
+		for b.Loop() {
+			largeSet.ForEachKey(func(key int) bool {
+				return true
+			})
+		}
+	})
+}

common/hmaps/params.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Hugo Authors. All rights reserved.
+// Copyright 2026 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,9 +11,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package maps
+package hmaps
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 
@@ -40,6 +41,14 @@ func (p Params) GetNested(indices ...string) any {
 // SetParams overwrites values in dst with values in src for common or new keys.
 // This is done recursively.
 func SetParams(dst, src Params) {
+	setParams(dst, src, 0)
+}
+
+func setParams(dst, src Params, depth int) {
+	const maxDepth = 1000
+	if depth > maxDepth {
+		panic(errors.New("max depth exceeded"))
+	}
 	for k, v := range src {
 		vv, found := dst[k]
 		if !found {
@@ -48,7 +57,7 @@ func SetParams(dst, src Params) {
 			switch vvv := vv.(type) {
 			case Params:
 				if pv, ok := v.(Params); ok {
-					SetParams(vvv, pv)
+					setParams(vvv, pv, depth+1)
 				} else {
 					dst[k] = v
 				}
@@ -101,7 +110,6 @@ func (p Params) merge(ps ParamsMergeStrategy, pp Params) {
 	noUpdate = noUpdate || (ps != "" && ps == ParamsMergeStrategyShallow)
 
 	for k, v := range pp {
-
 		if k == MergeStrategyKey {
 			continue
 		}
@@ -179,6 +187,56 @@ func getNested(m map[string]any, indices []string) (any, string, map[string]any)
 	}
 }
 
+// CreateNestedParamsFromSegements creates empty nested maps for the given keySegments in the target map.
+func CreateNestedParamsFromSegements(target Params, keySegments ...string) Params {
+	if len(keySegments) == 0 {
+		return target
+	}
+
+	m := target
+	for i, key := range keySegments {
+		v, found := m[key]
+		if !found {
+			nm := Params{}
+			m[key] = nm
+			m = nm
+			if i == len(keySegments)-1 {
+				return nm
+			}
+			continue
+		}
+		m = v.(Params)
+	}
+
+	return m
+}
+
+// CreateNestedParamsSepString creates empty nested maps for the given keyStr in the target map
+// It returns the last map created.
+func CreateNestedParamsSepString(keyStr, separator string, target Params) Params {
+	keySegments := strings.Split(keyStr, separator)
+	return CreateNestedParamsFromSegements(target, keySegments...)
+}
+
+// SetNestedParamIfNotSet sets the value for the given keyStr in the target map if it does not exist.
+// It assumes that all but the last key in keyStr is a Params map or should be one.
+func SetNestedParamIfNotSet(keyStr, separator string, value any, target Params) Params {
+	keySegments := strings.Split(keyStr, separator)
+	if len(keySegments) == 0 {
+		return target
+	}
+	base := keySegments[:len(keySegments)-1]
+	last := keySegments[len(keySegments)-1]
+
+	m := CreateNestedParamsFromSegements(target, base...)
+
+	if _, ok := m[last]; !ok {
+		m[last] = value
+	}
+
+	return target
+}
+
 // GetNestedParam gets the first match of the keyStr in the candidates given.
 // It will first try the exact match and then try to find it as a nested map value,
 // using the given separator, e.g. "mymap.name".
@@ -266,9 +324,17 @@ func CleanConfigStringMapString(m map[string]string) map[string]string {
 // CleanConfigStringMap is the same as CleanConfigStringMapString but for
 // map[string]any.
 func CleanConfigStringMap(m map[string]any) map[string]any {
+	return doCleanConfigStringMap(m, 0)
+}
+
+func doCleanConfigStringMap(m map[string]any, depth int) map[string]any {
 	if len(m) == 0 {
 		return m
 	}
+	const maxDepth = 1000
+	if depth > maxDepth {
+		panic(errors.New("max depth exceeded"))
+	}
 	if _, found := m[MergeStrategyKey]; !found {
 		return m
 	}
@@ -280,9 +346,9 @@ func CleanConfigStringMap(m map[string]any) map[string]any {
 		}
 		switch v2 := v.(type) {
 		case map[string]any:
-			m2[k] = CleanConfigStringMap(v2)
+			m2[k] = doCleanConfigStringMap(v2, depth+1)
 		case Params:
-			var p Params = CleanConfigStringMap(v2)
+			var p Params = doCleanConfigStringMap(v2, depth+1)
 			m2[k] = p
 		case map[string]string:
 			m2[k] = CleanConfigStringMapString(v2)
@@ -303,7 +369,7 @@ func toMergeStrategy(v any) ParamsMergeStrategy {
 }
 
 // PrepareParams
-// * makes all the keys in the given map lower cased and will do so
+// * makes all the keys in the given map lower cased and will do so recursively.
 // * This will modify the map given.
 // * Any nested map[interface{}]interface{}, map[string]interface{},map[string]string  will be converted to Params.
 // * Any _merge value will be converted to proper type and value.
@@ -343,3 +409,65 @@ func PrepareParams(m Params) {
 		}
 	}
 }
+
+// CloneParamsDeep does a deep clone of the given Params,
+// meaning that any nested Params will be cloned as well.
+func CloneParamsDeep(m Params) Params {
+	return cloneParamsDeep(m, 0)
+}
+
+func cloneParamsDeep(m Params, depth int) Params {
+	const maxDepth = 1000
+	if depth > maxDepth {
+		panic(errors.New("max depth exceeded"))
+	}
+	m2 := make(Params)
+	for k, v := range m {
+		switch vv := v.(type) {
+		case Params:
+			m2[k] = cloneParamsDeep(vv, depth+1)
+		default:
+			m2[k] = v
+		}
+	}
+	return m2
+}
+
+// PrepareParamsClone is like PrepareParams, but it does not modify the input.
+func PrepareParamsClone(m Params) Params {
+	m2 := make(Params)
+	for k, v := range m {
+		var retyped bool
+		lKey := strings.ToLower(k)
+		if lKey == MergeStrategyKey {
+			v = toMergeStrategy(v)
+			retyped = true
+		} else {
+			switch vv := v.(type) {
+			case map[any]any:
+				var p Params = cast.ToStringMap(v)
+				v = PrepareParamsClone(p)
+				retyped = true
+			case map[string]any:
+				var p Params = v.(map[string]any)
+				v = PrepareParamsClone(p)
+				retyped = true
+			case map[string]string:
+				p := make(Params)
+				for k, v := range vv {
+					p[k] = v
+				}
+				v = p
+				PrepareParams(p)
+				retyped = true
+			}
+		}
+
+		if retyped || k != lKey {
+			m2[lKey] = v
+		} else {
+			m2[k] = v
+		}
+	}
+	return m2
+}

common/hmaps/params_test.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Hugo Authors. All rights reserved.
+// Copyright 2026 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package maps
+package hmaps
 
 import (
 	"testing"
@@ -167,3 +167,35 @@ func TestParamsIsZero(t *testing.T) {
 	c.Assert(Params{"_merge": "foo", "foo": "bar"}.IsZero(), qt.IsFalse)
 	c.Assert(Params{"_merge": "foo"}.IsZero(), qt.IsTrue)
 }
+
+func TestSetNestedParamIfNotSet(t *testing.T) {
+	c := qt.New(t)
+
+	m := Params{}
+
+	SetNestedParamIfNotSet("a.b.c", ".", "value", m)
+	c.Assert(m, qt.DeepEquals, Params{
+		"a": Params{
+			"b": Params{
+				"c": "value",
+			},
+		},
+	})
+
+	m = Params{
+		"a": Params{
+			"b": Params{
+				"c": "existingValue",
+			},
+		},
+	}
+
+	SetNestedParamIfNotSet("a.b.c", ".", "value", m)
+	c.Assert(m, qt.DeepEquals, Params{
+		"a": Params{
+			"b": Params{
+				"c": "existingValue",
+			},
+		},
+	})
+}

common/hreflect/convert.go

@@ -0,0 +1,222 @@
+// Copyright 2025 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hreflect
+
+import (
+	"fmt"
+	"math"
+	"reflect"
+)
+
+var (
+	typeInt64   = reflect.TypeFor[int64]()
+	typeFloat64 = reflect.TypeFor[float64]()
+	typeString  = reflect.TypeFor[string]()
+)
+
+// ToInt64 converts v to int64 if possible, returning an error if not.
+func ToInt64E(v reflect.Value) (int64, error) {
+	if v, ok := ConvertIfPossible(v, typeInt64); ok {
+		return v.Int(), nil
+	}
+	return 0, errConvert(v, "int64")
+}
+
+// ToInt64 converts v to int64 if possible. It panics if the conversion is not possible.
+func ToInt64(v reflect.Value) int64 {
+	vv, err := ToInt64E(v)
+	if err != nil {
+		panic(err)
+	}
+	return vv
+}
+
+// ToFloat64E converts v to float64 if possible, returning an error if not.
+func ToFloat64E(v reflect.Value) (float64, error) {
+	if v, ok := ConvertIfPossible(v, typeFloat64); ok {
+		return v.Float(), nil
+	}
+	return 0, errConvert(v, "float64")
+}
+
+// ToFloat64 converts v to float64 if possible, panicking if not.
+func ToFloat64(v reflect.Value) float64 {
+	vv, err := ToFloat64E(v)
+	if err != nil {
+		panic(err)
+	}
+	return vv
+}
+
+// ToStringE converts v to string if possible, returning an error if not.
+func ToStringE(v reflect.Value) (string, error) {
+	vv, err := ToStringValueE(v)
+	if err != nil {
+		return "", err
+	}
+	return vv.String(), nil
+}
+
+func ToStringValueE(v reflect.Value) (reflect.Value, error) {
+	if v, ok := ConvertIfPossible(v, typeString); ok {
+		return v, nil
+	}
+	return reflect.Value{}, errConvert(v, "string")
+}
+
+// ToString converts v to string if possible, panicking if not.
+func ToString(v reflect.Value) string {
+	vv, err := ToStringE(v)
+	if err != nil {
+		panic(err)
+	}
+	return vv
+}
+
+func errConvert(v reflect.Value, s string) error {
+	return fmt.Errorf("unable to convert value of type %q to %q", v.Type().String(), s)
+}
+
+// ConvertIfPossible tries to convert val to typ if possible.
+// This is currently only implemented for int kinds,
+// added to handle the move to a new YAML library which produces uint64 for unsigned integers.
+// We can expand on this later if needed.
+// This conversion is lossless.
+// See Issue 14079.
+func ConvertIfPossible(val reflect.Value, typ reflect.Type) (reflect.Value, bool) {
+	switch val.Kind() {
+	case reflect.Ptr, reflect.Interface:
+		if val.IsNil() {
+			// Return typ's zero value.
+			return reflect.Zero(typ), true
+		}
+		val = val.Elem()
+	}
+
+	if val.Type().AssignableTo(typ) {
+		// No conversion needed.
+		return val, true
+	}
+
+	if IsInt(typ.Kind()) {
+		return convertToIntIfPossible(val, typ)
+	}
+	if IsFloat(typ.Kind()) {
+		return convertToFloatIfPossible(val, typ)
+	}
+	if IsUint(typ.Kind()) {
+		return convertToUintIfPossible(val, typ)
+	}
+	if IsString(typ.Kind()) && IsString(val.Kind()) {
+		return val.Convert(typ), true
+	}
+
+	return reflect.Value{}, false
+}
+
+func convertToUintIfPossible(val reflect.Value, typ reflect.Type) (reflect.Value, bool) {
+	if IsInt(val.Kind()) {
+		i := val.Int()
+		if i < 0 {
+			return reflect.Value{}, false
+		}
+		u := uint64(i)
+		if typ.OverflowUint(u) {
+			return reflect.Value{}, false
+		}
+		return reflect.ValueOf(u).Convert(typ), true
+	}
+	if IsUint(val.Kind()) {
+		if typ.OverflowUint(val.Uint()) {
+			return reflect.Value{}, false
+		}
+		return val.Convert(typ), true
+	}
+	if IsFloat(val.Kind()) {
+		f := val.Float()
+		if f < 0 || f > float64(math.MaxUint64) {
+			return reflect.Value{}, false
+		}
+		if f != math.Trunc(f) {
+			return reflect.Value{}, false
+		}
+		u := uint64(f)
+		if typ.OverflowUint(u) {
+			return reflect.Value{}, false
+		}
+		return reflect.ValueOf(u).Convert(typ), true
+	}
+	return reflect.Value{}, false
+}
+
+func convertToFloatIfPossible(val reflect.Value, typ reflect.Type) (reflect.Value, bool) {
+	if IsInt(val.Kind()) {
+		i := val.Int()
+		f := float64(i)
+		if typ.OverflowFloat(f) {
+			return reflect.Value{}, false
+		}
+		return reflect.ValueOf(f).Convert(typ), true
+	}
+	if IsUint(val.Kind()) {
+		u := val.Uint()
+		f := float64(u)
+		if typ.OverflowFloat(f) {
+			return reflect.Value{}, false
+		}
+		return reflect.ValueOf(f).Convert(typ), true
+	}
+	if IsFloat(val.Kind()) {
+		if typ.OverflowFloat(val.Float()) {
+			return reflect.Value{}, false
+		}
+		return val.Convert(typ), true
+	}
+
+	return reflect.Value{}, false
+}
+
+func convertToIntIfPossible(val reflect.Value, typ reflect.Type) (reflect.Value, bool) {
+	if IsInt(val.Kind()) {
+		if typ.OverflowInt(val.Int()) {
+			return reflect.Value{}, false
+		}
+		return val.Convert(typ), true
+	}
+	if IsUint(val.Kind()) {
+		if val.Uint() > uint64(math.MaxInt64) {
+			return reflect.Value{}, false
+		}
+		if typ.OverflowInt(int64(val.Uint())) {
+			return reflect.Value{}, false
+		}
+		return val.Convert(typ), true
+	}
+	if IsFloat(val.Kind()) {
+		f := val.Float()
+		if f < float64(math.MinInt64) || f > float64(math.MaxInt64) {
+			return reflect.Value{}, false
+		}
+		if f != math.Trunc(f) {
+			return reflect.Value{}, false
+		}
+		if typ.OverflowInt(int64(f)) {
+			return reflect.Value{}, false
+		}
+		return reflect.ValueOf(int64(f)).Convert(typ), true
+
+	}
+
+	return reflect.Value{}, false
+}

common/hreflect/convert_test.go

@@ -0,0 +1,284 @@
+// Copyright 2025 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hreflect
+
+import (
+	"math"
+	"reflect"
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+	"github.com/gohugoio/hugo/htesting/hqt"
+)
+
+func TestToFuncs(t *testing.T) {
+	c := qt.New(t)
+
+	c.Assert(ToInt64(reflect.ValueOf(int(42))), qt.Equals, int64(42))
+	c.Assert(ToFloat64(reflect.ValueOf(float32(3.14))), hqt.IsSameFloat64, float64(3.14))
+	c.Assert(ToString(reflect.ValueOf("hello")), qt.Equals, "hello")
+}
+
+func TestConvertIfPossible(t *testing.T) {
+	c := qt.New(t)
+
+	for _, test := range []struct {
+		name     string
+		value    any
+		typ      any
+		expected any
+		ok       bool
+	}{
+		// From uint to int.
+		{
+			name:  "uint64(math.MaxUint64) to int16",
+			value: uint64(math.MaxUint64),
+			typ:   int16(0),
+			ok:    false, // overflow
+		},
+
+		{
+			name:  "uint64(math.MaxUint64) to int64",
+			value: uint64(math.MaxUint64),
+			typ:   int64(0),
+			ok:    false, // overflow
+		},
+		{
+			name:     "uint64(math.MaxInt16) to int16",
+			value:    uint64(math.MaxInt16),
+			typ:      int64(0),
+			ok:       true,
+			expected: int64(math.MaxInt16),
+		},
+		// From int to int.
+		{
+			name:  "int64(math.MaxInt64) to int16",
+			value: int64(math.MaxInt64),
+			typ:   int16(0),
+			ok:    false, // overflow
+		},
+		{
+			name:     "int64(math.MaxInt16) to int",
+			value:    int64(math.MaxInt16),
+			typ:      int(0),
+			ok:       true,
+			expected: int(math.MaxInt16),
+		},
+
+		{
+			name:     "int64(math.MaxInt16) to int",
+			value:    int64(math.MaxInt16),
+			typ:      int(0),
+			ok:       true,
+			expected: int(math.MaxInt16),
+		},
+		// From float64 to int.
+		{
+			name:  "float64(1.5) to int",
+			value: float64(1.5),
+			typ:   int(0),
+			ok:    false, // loss of precision
+		},
+		{
+			name:     "float64(1.0) to int",
+			value:    float64(1.0),
+			typ:      int(0),
+			ok:       true,
+			expected: int(1),
+		},
+		{
+			name:  "float64(math.MaxInt16+1) to int16",
+			value: float64(math.MaxInt16 + 1),
+			typ:   int16(0),
+			ok:    false, // overflow
+		},
+		{
+			name:  "float64(math.MaxFloat64) to int64",
+			value: float64(math.MaxFloat64),
+			typ:   int64(0),
+			ok:    false, // overflow
+		},
+		{
+			name:     "float64(32767) to int16",
+			value:    float64(32767),
+			typ:      int16(0),
+			ok:       true,
+			expected: int16(32767),
+		},
+		// From float32 to int.
+		{
+			name:  "float32(1.5) to int",
+			value: float32(1.5),
+			typ:   int(0),
+			ok:    false, // loss of precision
+		},
+		{
+			name:     "float32(1.0) to int",
+			value:    float32(1.0),
+			typ:      int(0),
+			ok:       true,
+			expected: int(1),
+		},
+		{
+			name:  "float32(math.MaxFloat32) to int16",
+			value: float32(math.MaxFloat32),
+			typ:   int16(0),
+			ok:    false, // overflow
+		},
+		{
+			name:  "float32(math.MaxFloat32) to int64",
+			value: float32(math.MaxFloat32),
+			typ:   int64(0),
+			ok:    false, // overflow
+		},
+		{
+			name:     "float32(math.MaxInt16) to int16",
+			value:    float32(math.MaxInt16),
+			typ:      int16(0),
+			ok:       true,
+			expected: int16(32767),
+		},
+		{
+			name:  "float32(math.MaxInt16+1) to int16",
+			value: float32(math.MaxInt16 + 1),
+			typ:   int16(0),
+			ok:    false, // overflow
+		},
+		// Int to float.
+		{
+			name:     "int16(32767) to float32",
+			value:    int16(32767),
+			typ:      float32(0),
+			ok:       true,
+			expected: float32(32767),
+		},
+		{
+			name:     "int64(32767) to float32",
+			value:    int64(32767),
+			typ:      float32(0),
+			ok:       true,
+			expected: float32(32767),
+		},
+		{
+			name:     "int64(math.MaxInt64) to float32",
+			value:    int64(math.MaxInt64),
+			typ:      float32(0),
+			ok:       true,
+			expected: float32(math.MaxInt64),
+		},
+		{
+			name:     "int64(math.MaxInt64) to float64",
+			value:    int64(math.MaxInt64),
+			typ:      float64(0),
+			ok:       true,
+			expected: float64(math.MaxInt64),
+		},
+		// Int to uint.
+		{
+			name:     "int16(32767) to uint16",
+			value:    int16(32767),
+			typ:      uint16(0),
+			ok:       true,
+			expected: uint16(32767),
+		},
+		{
+			name:  "int16(32767) to uint8",
+			value: int16(32767),
+			typ:   uint8(0),
+			ok:    false,
+		},
+		{
+			name:  "float64(3.14) to uint64",
+			value: float64(3.14),
+			typ:   uint64(0),
+			ok:    false,
+		},
+		{
+			name:     "float64(3.0) to uint64",
+			value:    float64(3.0),
+			typ:      uint64(0),
+			ok:       true,
+			expected: uint64(3),
+		},
+		// From uint to float.
+		{
+			name:     "uint64(math.MaxInt16) to float64",
+			value:    uint64(math.MaxInt16),
+			typ:      float64(0),
+			ok:       true,
+			expected: float64(math.MaxInt16),
+		},
+		// Float to float.
+		{
+			name:     "float64(3.14) to float32",
+			value:    float64(3.14),
+			typ:      float32(0),
+			ok:       true,
+			expected: float32(3.14),
+		},
+		{
+			name:     "float32(3.14) to float64",
+			value:    float32(3.14),
+			typ:      float64(0),
+			ok:       true,
+			expected: float64(3.14),
+		},
+		{
+			name:     "float64(3.14) to float64",
+			value:    float64(3.14),
+			typ:      float64(0),
+			ok:       true,
+			expected: float64(3.14),
+		},
+	} {
+
+		v, ok := ConvertIfPossible(reflect.ValueOf(test.value), reflect.TypeOf(test.typ))
+		c.Assert(ok, qt.Equals, test.ok, qt.Commentf("test case: %s", test.name))
+		if test.ok {
+			c.Assert(v.Interface(), hqt.IsSameNumber, test.expected, qt.Commentf("test case: %s", test.name))
+		}
+	}
+}
+
+func TestConvertIfPossibleMisc(t *testing.T) {
+	c := qt.New(t)
+	type s string
+
+	var (
+		i          = int32(42)
+		i64        = int64(i)
+		iv     any = i
+		ip         = &i
+		inil   any = (*int32)(nil)
+		shello     = s("hello")
+	)
+
+	convertOK := func(v any, typ any) any {
+		rv, ok := ConvertIfPossible(reflect.ValueOf(v), reflect.TypeOf(typ))
+		c.Assert(ok, qt.IsTrue)
+		return rv.Interface()
+	}
+
+	c.Assert(convertOK(shello, ""), qt.Equals, "hello")
+	c.Assert(convertOK(ip, int64(0)), qt.Equals, i64)
+	c.Assert(convertOK(iv, int64(0)), qt.Equals, i64)
+	c.Assert(convertOK(inil, int64(0)), qt.Equals, int64(0))
+}
+
+func BenchmarkToInt64(b *testing.B) {
+	v := reflect.ValueOf(int(42))
+	for b.Loop() {
+		ToInt64(v)
+	}
+}

common/hreflect/helpers.go

@@ -1,6 +1,4 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
-// Some functions in this file (see comments) is based on the Go source code,
-// copyright The Go Authors and  governed by a BSD-style license.
+// Copyright 2025 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -22,11 +20,16 @@ import (
 	"sync"
 	"time"
 
+	"github.com/gohugoio/hugo/common/hmaps"
 	"github.com/gohugoio/hugo/common/htime"
-	"github.com/gohugoio/hugo/common/maps"
 	"github.com/gohugoio/hugo/common/types"
 )
 
+// IsInterfaceOrPointer returns whether the given kind is an interface or a pointer.
+func IsInterfaceOrPointer(kind reflect.Kind) bool {
+	return kind == reflect.Interface || kind == reflect.Ptr
+}
+
 // TODO(bep) replace the private versions in /tpl with these.
 // IsNumber returns whether the given kind is a number.
 func IsNumber(kind reflect.Kind) bool {
@@ -63,6 +66,11 @@ func IsFloat(kind reflect.Kind) bool {
 	}
 }
 
+// IsString returns whether the given kind is a string.
+func IsString(kind reflect.Kind) bool {
+	return kind == reflect.String
+}
+
 // IsTruthful returns whether in represents a truthful value.
 // See IsTruthfulValue
 func IsTruthful(in any) bool {
@@ -74,8 +82,30 @@ func IsTruthful(in any) bool {
 	}
 }
 
+// IsMap reports whether v is a map.
+func IsMap(v any) bool {
+	return reflect.ValueOf(v).Kind() == reflect.Map
+}
+
+// IsSlice reports whether v is a slice.
+func IsSlice(v any) bool {
+	return reflect.ValueOf(v).Kind() == reflect.Slice
+}
+
 var zeroType = reflect.TypeOf((*types.Zeroer)(nil)).Elem()
 
+var isZeroCache sync.Map
+
+func implementsIsZero(tp reflect.Type) bool {
+	v, ok := isZeroCache.Load(tp)
+	if ok {
+		return v.(bool)
+	}
+	implements := tp.Implements(zeroType)
+	isZeroCache.Store(tp, implements)
+	return implements
+}
+
 // IsTruthfulValue returns whether the given value has a meaningful truth value.
 // This is based on template.IsTrue in Go's stdlib, but also considers
 // IsZero and any interface value will be unwrapped before it's considered
@@ -84,14 +114,18 @@ var zeroType = reflect.TypeOf((*types.Zeroer)(nil)).Elem()
 // Based on:
 // https://github.com/golang/go/blob/178a2c42254166cffed1b25fb1d3c7a5727cada6/src/text/template/exec.go#L306
 func IsTruthfulValue(val reflect.Value) (truth bool) {
-	val = indirectInterface(val)
+	val, isNil := Indirect(val)
 
 	if !val.IsValid() {
-		// Something like var x interface{}, never set. It's a form of nil.
+		// Something like: var x any, never set. It's a form of nil.
 		return
 	}
 
-	if val.Type().Implements(zeroType) {
+	if val.Kind() == reflect.Pointer && isNil {
+		return
+	}
+
+	if implementsIsZero(val.Type()) {
 		return !val.Interface().(types.Zeroer).IsZero()
 	}
 
@@ -124,15 +158,31 @@ type methodKey struct {
 	name string
 }
 
-type methods struct {
-	sync.RWMutex
-	cache map[methodKey]int
+var (
+	methodIndexCache sync.Map
+	methodCache      sync.Map
+)
+
+// GetMethodByNameForType returns the method with the given name for the given type,
+// or a zero Method if no such method exists.
+// It panics if tp is an interface type.
+// It caches the lookup.
+func GetMethodByNameForType(tp reflect.Type, name string) reflect.Method {
+	if tp.Kind() == reflect.Interface {
+		// Func field is nil for interface types.
+		panic("not supported for interface types")
+	}
+	k := methodKey{tp, name}
+	v, found := methodCache.Load(k)
+	if found {
+		return v.(reflect.Method)
+	}
+	m, _ := tp.MethodByName(name)
+	methodCache.Store(k, m)
+	return m
 }
 
-var methodCache = &methods{cache: make(map[methodKey]int)}
-
-// GetMethodByName is the same as reflect.Value.MethodByName, but it caches the
-// type lookup.
+// GetMethodByName is the same as reflect.Value.MethodByName, but it caches the lookup.
 func GetMethodByName(v reflect.Value, name string) reflect.Value {
 	index := GetMethodIndexByName(v.Type(), name)
 
@@ -147,22 +197,16 @@ func GetMethodByName(v reflect.Value, name string) reflect.Value {
 // -1 if no such method exists.
 func GetMethodIndexByName(tp reflect.Type, name string) int {
 	k := methodKey{tp, name}
-	methodCache.RLock()
-	index, found := methodCache.cache[k]
-	methodCache.RUnlock()
+	v, found := methodIndexCache.Load(k)
 	if found {
-		return index
+		return v.(int)
 	}
-
-	methodCache.Lock()
-	defer methodCache.Unlock()
-
 	m, ok := tp.MethodByName(name)
-	index = m.Index
+	index := m.Index
 	if !ok {
 		index = -1
 	}
-	methodCache.cache[k] = index
+	methodIndexCache.Store(k, index)
 
 	if !ok {
 		return -1
@@ -235,7 +279,7 @@ func ToSliceAny(v any) ([]any, bool) {
 		vvv := reflect.ValueOf(v)
 		if vvv.Kind() == reflect.Slice {
 			out := make([]any, vvv.Len())
-			for i := 0; i < vvv.Len(); i++ {
+			for i := range vvv.Len() {
 				out[i] = vvv.Index(i).Interface()
 			}
 			return out, true
@@ -244,6 +288,7 @@ func ToSliceAny(v any) ([]any, bool) {
 	return nil, false
 }
 
+// CallMethodByName calls the method with the given name on v.
 func CallMethodByName(cxt context.Context, name string, v reflect.Value) []reflect.Value {
 	fn := v.MethodByName(name)
 	var args []reflect.Value
@@ -261,20 +306,56 @@ func CallMethodByName(cxt context.Context, name string, v reflect.Value) []refle
 	return fn.Call(args)
 }
 
-// Based on: https://github.com/golang/go/blob/178a2c42254166cffed1b25fb1d3c7a5727cada6/src/text/template/exec.go#L931
-func indirectInterface(v reflect.Value) reflect.Value {
-	if v.Kind() != reflect.Interface {
-		return v
+// Indirect unwraps interfaces and pointers until it finds a non-interface/pointer value.
+// If a nil is encountered, the second return value is true.
+// If a pointer to a struct is encountered, it is not unwrapped.
+func Indirect(v reflect.Value) (vv reflect.Value, isNil bool) {
+	for ; IsInterfaceOrPointer(v.Kind()); v = v.Elem() {
+		if IsNil(v) {
+			return v, true
+		}
+		if v.Kind() != reflect.Interface {
+			// A pointer.
+			if v.NumMethod() > 0 {
+				break
+			}
+			if v.Elem().Kind() == reflect.Struct {
+				// Avoid unwrapping pointers to structs.
+				break
+			}
+		}
 	}
-	if v.IsNil() {
-		return reflect.Value{}
+	return v, false
+}
+
+// IndirectElem is like Indirect, but if the final value is a pointer, it unwraps it.
+func IndirectElem(v reflect.Value) (vv reflect.Value, isNil bool) {
+	vv, isNil = Indirect(v)
+	if isNil {
+		return vv, isNil
 	}
-	return v.Elem()
+	if vv.Kind() == reflect.Pointer {
+		vv = vv.Elem()
+	}
+	return vv, isNil
+}
+
+// IsNil reports whether v is nil.
+// Based on reflect.Value.IsNil, but also considers invalid values as nil.
+func IsNil(v reflect.Value) bool {
+	if !v.IsValid() {
+		return true
+	}
+	switch v.Kind() {
+	case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
+		return v.IsNil()
+	}
+	return false
 }
 
 var contextInterface = reflect.TypeOf((*context.Context)(nil)).Elem()
 
-var isContextCache = maps.NewCache[reflect.Type, bool]()
+var isContextCache = hmaps.NewCache[reflect.Type, bool]()
 
 type k string
 

common/hreflect/helpers_test.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Hugo Authors. All rights reserved.
+// Copyright 2025 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -20,15 +20,32 @@ import (
 	"time"
 
 	qt "github.com/frankban/quicktest"
+	"github.com/gohugoio/hugo/htesting/hqt"
 )
 
+type zeroStruct struct {
+	zero bool
+}
+
+func (z zeroStruct) IsZero() bool {
+	return z.zero
+}
+
 func TestIsTruthful(t *testing.T) {
 	c := qt.New(t)
 
+	var nilpointerZero *zeroStruct
+
 	c.Assert(IsTruthful(true), qt.Equals, true)
 	c.Assert(IsTruthful(false), qt.Equals, false)
 	c.Assert(IsTruthful(time.Now()), qt.Equals, true)
 	c.Assert(IsTruthful(time.Time{}), qt.Equals, false)
+	c.Assert(IsTruthful(&zeroStruct{zero: false}), qt.Equals, true)
+	c.Assert(IsTruthful(&zeroStruct{zero: true}), qt.Equals, false)
+	c.Assert(IsTruthful(zeroStruct{zero: false}), qt.Equals, true)
+	c.Assert(IsTruthful(zeroStruct{zero: true}), qt.Equals, false)
+	c.Assert(IsTruthful(nil), qt.Equals, false)
+	c.Assert(IsTruthful(nilpointerZero), qt.Equals, false)
 }
 
 func TestGetMethodByName(t *testing.T) {
@@ -63,18 +80,90 @@ func TestToSliceAny(t *testing.T) {
 	checkOK([]int{1, 2, 3}, []any{1, 2, 3})
 }
 
+type testIndirectStruct struct {
+	S string
+}
+
+func (t *testIndirectStruct) GetS() string {
+	return t.S
+}
+
+func (t testIndirectStruct) Foo() string {
+	return "bar"
+}
+
+type testIndirectStructNoMethods struct {
+	S string
+}
+
+func TestIsNil(t *testing.T) {
+	c := qt.New(t)
+
+	var (
+		nilPtr      *testIndirectStruct
+		nilIface    any = nil
+		nonNilIface any = &testIndirectStruct{S: "hello"}
+	)
+
+	c.Assert(IsNil(reflect.ValueOf(nilPtr)), qt.Equals, true)
+	c.Assert(IsNil(reflect.ValueOf(nilIface)), qt.Equals, true)
+	c.Assert(IsNil(reflect.ValueOf(nonNilIface)), qt.Equals, false)
+}
+
+func TestIndirectInterface(t *testing.T) {
+	c := qt.New(t)
+
+	var (
+		structWithMethods               = testIndirectStruct{S: "hello"}
+		structWithMethodsPointer        = &testIndirectStruct{S: "hello"}
+		structWithMethodsPointerAny any = structWithMethodsPointer
+		structPointerToPointer          = &structWithMethodsPointer
+		structNoMethodsPtr              = &testIndirectStructNoMethods{S: "no methods"}
+		structNoMethods                 = testIndirectStructNoMethods{S: "no methods"}
+		intValue                        = 32
+		intPtr                          = &intValue
+		nilPtr                      *testIndirectStruct
+		nilIface                    any = nil
+	)
+
+	ind := func(v any) any {
+		c.Helper()
+		vv, isNil := Indirect(reflect.ValueOf(v))
+		c.Assert(isNil, qt.IsFalse)
+		return vv.Interface()
+	}
+
+	c.Assert(ind(intValue), hqt.IsSameType, 32)
+	c.Assert(ind(intPtr), hqt.IsSameType, 32)
+	c.Assert(ind(structNoMethodsPtr), hqt.IsSameType, structNoMethodsPtr)
+	c.Assert(ind(structWithMethods), hqt.IsSameType, structWithMethods)
+	c.Assert(ind(structNoMethods), hqt.IsSameType, structNoMethods)
+	c.Assert(ind(structPointerToPointer), hqt.IsSameType, &testIndirectStruct{})
+	c.Assert(ind(structWithMethodsPointer), hqt.IsSameType, &testIndirectStruct{})
+	c.Assert(ind(structWithMethodsPointerAny), hqt.IsSameType, structWithMethodsPointer)
+
+	vv, isNil := Indirect(reflect.ValueOf(nilPtr))
+	c.Assert(isNil, qt.IsTrue)
+	c.Assert(vv, qt.Equals, reflect.ValueOf(nilPtr))
+
+	vv, isNil = Indirect(reflect.ValueOf(nilIface))
+	c.Assert(isNil, qt.IsFalse)
+	c.Assert(vv, qt.Equals, reflect.ValueOf(nilIface))
+}
+
 func BenchmarkIsContextType(b *testing.B) {
+	const size = 1000
 	type k string
 	b.Run("value", func(b *testing.B) {
 		ctx := context.Background()
-		ctxs := make([]reflect.Type, b.N)
-		for i := 0; i < b.N; i++ {
+		ctxs := make([]reflect.Type, size)
+		for i := range size {
 			ctxs[i] = reflect.TypeOf(context.WithValue(ctx, k("key"), i))
 		}
 
-		b.ResetTimer()
-		for i := 0; i < b.N; i++ {
-			if !IsContextType(ctxs[i]) {
+		for i := 0; b.Loop(); i++ {
+			idx := i % size
+			if !IsContextType(ctxs[idx]) {
 				b.Fatal("not context")
 			}
 		}
@@ -82,7 +171,7 @@ func BenchmarkIsContextType(b *testing.B) {
 
 	b.Run("background", func(b *testing.B) {
 		var ctxt reflect.Type = reflect.TypeOf(context.Background())
-		for i := 0; i < b.N; i++ {
+		for b.Loop() {
 			if !IsContextType(ctxt) {
 				b.Fatal("not context")
 			}
@@ -90,14 +179,25 @@ func BenchmarkIsContextType(b *testing.B) {
 	})
 }
 
-func BenchmarkIsTruthFul(b *testing.B) {
-	v := reflect.ValueOf("Hugo")
+func BenchmarkIsTruthFulValue(b *testing.B) {
+	var (
+		stringHugo  = reflect.ValueOf("Hugo")
+		stringEmpty = reflect.ValueOf("")
+		zero        = reflect.ValueOf(time.Time{})
+		timeNow     = reflect.ValueOf(time.Now())
+		boolTrue    = reflect.ValueOf(true)
+		boolFalse   = reflect.ValueOf(false)
+		nilPointer  = reflect.ValueOf((*zeroStruct)(nil))
+	)
 
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		if !IsTruthfulValue(v) {
-			b.Fatal("not truthful")
-		}
+	for b.Loop() {
+		IsTruthfulValue(stringHugo)
+		IsTruthfulValue(stringEmpty)
+		IsTruthfulValue(zero)
+		IsTruthfulValue(timeNow)
+		IsTruthfulValue(boolTrue)
+		IsTruthfulValue(boolFalse)
+		IsTruthfulValue(nilPointer)
 	}
 }
 
@@ -123,14 +223,38 @@ func (t *testStruct) Method5() string {
 	return "Hugo"
 }
 
+func BenchmarkGetMethodByNameForType(b *testing.B) {
+	tp := reflect.TypeFor[*testStruct]()
+	methods := []string{"Method1", "Method2", "Method3", "Method4", "Method5"}
+
+	for b.Loop() {
+		for _, method := range methods {
+			_ = GetMethodByNameForType(tp, method)
+		}
+	}
+}
+
 func BenchmarkGetMethodByName(b *testing.B) {
 	v := reflect.ValueOf(&testStruct{})
 	methods := []string{"Method1", "Method2", "Method3", "Method4", "Method5"}
 
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		for _, method := range methods {
 			_ = GetMethodByName(v, method)
 		}
 	}
 }
+
+func BenchmarkGetMethodByNamePara(b *testing.B) {
+	v := reflect.ValueOf(&testStruct{})
+	methods := []string{"Method1", "Method2", "Method3", "Method4", "Method5"}
+
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			for _, method := range methods {
+				_ = GetMethodByName(v, method)
+			}
+		}
+	})
+}

common/hstore/scratch.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Hugo Authors. All rights reserved.
+// Copyright 2025 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package maps
+package hstore
 
 import (
 	"reflect"

common/hstore/scratch_test.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2025 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package maps
+package hstore
 
 import (
 	"reflect"
@@ -140,7 +140,7 @@ func TestScratchInParallel(t *testing.T) {
 	for i := 1; i <= 10; i++ {
 		wg.Add(1)
 		go func(j int) {
-			for k := 0; k < 10; k++ {
+			for k := range 10 {
 				newVal := int64(k + j)
 
 				_, err := scratch.Add(key, newVal)
@@ -214,8 +214,8 @@ func TestScratchGetSortedMapValues(t *testing.T) {
 func BenchmarkScratchGet(b *testing.B) {
 	scratch := NewScratch()
 	scratch.Add("A", 1)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+
+	for b.Loop() {
 		scratch.Get("A")
 	}
 }

common/hstrings/strings.go

@@ -16,6 +16,8 @@ package hstrings
 import (
 	"fmt"
 	"regexp"
+	"slices"
+	"sort"
 	"strings"
 	"sync"
 
@@ -50,12 +52,7 @@ func (s StringEqualFold) Eq(s2 any) bool {
 
 // EqualAny returns whether a string is equal to any of the given strings.
 func EqualAny(a string, b ...string) bool {
-	for _, s := range b {
-		if a == s {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(b, a)
 }
 
 // regexpCache represents a cache of regexp objects protected by a mutex.
@@ -100,17 +97,22 @@ func GetOrCompileRegexp(pattern string) (re *regexp.Regexp, err error) {
 	return reCache.getOrCompileRegexp(pattern)
 }
 
-// InSlice checks if a string is an element of a slice of strings
-// and returns a boolean value.
-func InSlice(arr []string, el string) bool {
-	for _, v := range arr {
-		if v == el {
+// HasAnyPrefix checks if the string s has any of the prefixes given.
+func HasAnyPrefix(s string, prefixes ...string) bool {
+	for _, p := range prefixes {
+		if strings.HasPrefix(s, p) {
 			return true
 		}
 	}
 	return false
 }
 
+// InSlice checks if a string is an element of a slice of strings
+// and returns a boolean value.
+func InSlice(arr []string, el string) bool {
+	return slices.Contains(arr, el)
+}
+
 // InSlicEqualFold checks if a string is an element of a slice of strings
 // and returns a boolean value.
 // It uses strings.EqualFold to compare.
@@ -137,7 +139,61 @@ func ToString(v any) (string, bool) {
 	return "", false
 }
 
-type Tuple struct {
-	First  string
-	Second string
+// UniqueStrings returns a new slice with any duplicates removed.
+func UniqueStrings(s []string) []string {
+	unique := make([]string, 0, len(s))
+	for i, val := range s {
+		var seen bool
+		for j := range i {
+			if s[j] == val {
+				seen = true
+				break
+			}
+		}
+		if !seen {
+			unique = append(unique, val)
+		}
+	}
+	return unique
+}
+
+// UniqueStringsReuse returns a slice with any duplicates removed.
+// It will modify the input slice.
+func UniqueStringsReuse(s []string) []string {
+	result := s[:0]
+	for i, val := range s {
+		var seen bool
+
+		for j := range i {
+			if s[j] == val {
+				seen = true
+				break
+			}
+		}
+
+		if !seen {
+			result = append(result, val)
+		}
+	}
+	return result
+}
+
+// UniqueStringsSorted returns a sorted slice with any duplicates removed.
+// It will modify the input slice.
+func UniqueStringsSorted(s []string) []string {
+	if len(s) == 0 {
+		return nil
+	}
+	ss := sort.StringSlice(s)
+	ss.Sort()
+	i := 0
+	for j := 1; j < len(s); j++ {
+		if !ss.Less(i, j) {
+			continue
+		}
+		i++
+		s[i] = s[j]
+	}
+
+	return s[:i+1]
 }

common/hstrings/strings_test.go

@@ -1,4 +1,4 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
+// Copyright 2025 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -14,6 +14,7 @@
 package hstrings
 
 import (
+	"reflect"
 	"regexp"
 	"testing"
 
@@ -43,14 +44,91 @@ func TestGetOrCompileRegexp(t *testing.T) {
 	c.Assert(re.MatchString("123"), qt.Equals, true)
 }
 
+func TestUniqueStrings(t *testing.T) {
+	in := []string{"a", "b", "a", "b", "c", "", "a", "", "d"}
+	output := UniqueStrings(in)
+	expected := []string{"a", "b", "c", "", "d"}
+	if !reflect.DeepEqual(output, expected) {
+		t.Errorf("Expected %#v, got %#v\n", expected, output)
+	}
+}
+
+func TestUniqueStringsReuse(t *testing.T) {
+	in := []string{"a", "b", "a", "b", "c", "", "a", "", "d"}
+	output := UniqueStringsReuse(in)
+	expected := []string{"a", "b", "c", "", "d"}
+	if !reflect.DeepEqual(output, expected) {
+		t.Errorf("Expected %#v, got %#v\n", expected, output)
+	}
+}
+
+func TestUniqueStringsSorted(t *testing.T) {
+	c := qt.New(t)
+	in := []string{"a", "a", "b", "c", "b", "", "a", "", "d"}
+	output := UniqueStringsSorted(in)
+	expected := []string{"", "a", "b", "c", "d"}
+	c.Assert(output, qt.DeepEquals, expected)
+	c.Assert(UniqueStringsSorted(nil), qt.IsNil)
+}
+
+// Note that these cannot use b.Loop() because of golang/go#27217.
+func BenchmarkUniqueStrings(b *testing.B) {
+	input := []string{"a", "b", "d", "e", "d", "h", "a", "i"}
+
+	b.Run("Safe", func(b *testing.B) {
+		for b.Loop() {
+			result := UniqueStrings(input)
+			if len(result) != 6 {
+				b.Fatalf("invalid count: %d", len(result))
+			}
+		}
+	})
+
+	b.Run("Reuse slice", func(b *testing.B) {
+		inputs := make([][]string, b.N)
+		for i := 0; i < b.N; i++ {
+			inputc := make([]string, len(input))
+			copy(inputc, input)
+			inputs[i] = inputc
+		}
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			inputc := inputs[i]
+
+			result := UniqueStringsReuse(inputc)
+			if len(result) != 6 {
+				b.Fatalf("invalid count: %d", len(result))
+			}
+		}
+	})
+
+	b.Run("Reuse slice sorted", func(b *testing.B) {
+		inputs := make([][]string, b.N)
+		for i := 0; i < b.N; i++ {
+			inputc := make([]string, len(input))
+			copy(inputc, input)
+			inputs[i] = inputc
+		}
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			inputc := inputs[i]
+
+			result := UniqueStringsSorted(inputc)
+			if len(result) != 6 {
+				b.Fatalf("invalid count: %d", len(result))
+			}
+		}
+	})
+}
+
 func BenchmarkGetOrCompileRegexp(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		GetOrCompileRegexp(`\d+`)
 	}
 }
 
 func BenchmarkCompileRegexp(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		regexp.MustCompile(`\d+`)
 	}
 }

common/hsync/oncemore.go

@@ -0,0 +1,162 @@
+// Copyright 2025 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hsync
+
+import (
+	"context"
+	"sync"
+	"sync/atomic"
+)
+
+// OnceMore is similar to sync.Once.
+//
+// Additional features are:
+// * it can be reset, so the action can be repeated if needed
+// * it has methods to check if it's done or in progress
+type OnceMore struct {
+	_    doNotCopy
+	done atomic.Bool
+	mu   sync.Mutex
+}
+
+func (t *OnceMore) Do(f func()) {
+	if t.Done() {
+		return
+	}
+
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	// Double check
+	if t.Done() {
+		return
+	}
+
+	defer t.done.Store(true)
+	f()
+}
+
+func (t *OnceMore) Done() bool {
+	return t.done.Load()
+}
+
+func (t *OnceMore) Reset() {
+	t.mu.Lock()
+	t.done.Store(false)
+	t.mu.Unlock()
+}
+
+type ValueResetter[T any] struct {
+	reset func()
+	f     func(context.Context) T
+}
+
+func (v *ValueResetter[T]) Value(ctx context.Context) T {
+	return v.f(ctx)
+}
+
+func (v *ValueResetter[T]) Reset() {
+	v.reset()
+}
+
+// OnceMoreValue returns a function that invokes f only once and returns the value
+// returned by f. The returned function may be called concurrently.
+//
+// If f panics, the returned function will panic with the same value on every call.
+func OnceMoreValue[T any](f func(context.Context) T) ValueResetter[T] {
+	v := struct {
+		f      func(context.Context) T
+		once   OnceMore
+		ok     bool
+		p      any
+		result T
+	}{
+		f: f,
+	}
+	ff := func(ctx context.Context) T {
+		v.once.Do(func() {
+			v.ok = false
+			defer func() {
+				v.p = recover()
+				if !v.ok {
+					panic(v.p)
+				}
+			}()
+			v.result = v.f(ctx)
+			v.ok = true
+		})
+		if !v.ok {
+			panic(v.p)
+		}
+		return v.result
+	}
+
+	return ValueResetter[T]{
+		reset: v.once.Reset,
+		f:     ff,
+	}
+}
+
+type FuncResetter struct {
+	f     func(context.Context) error
+	reset func()
+}
+
+func (v *FuncResetter) Do(ctx context.Context) error {
+	return v.f(ctx)
+}
+
+func (v *FuncResetter) Reset() {
+	v.reset()
+}
+
+func OnceMoreFunc(f func(context.Context) error) FuncResetter {
+	v := struct {
+		f    func(context.Context) error
+		once OnceMore
+		ok   bool
+		err  error
+		p    any
+	}{
+		f: f,
+	}
+	ff := func(ctx context.Context) error {
+		v.once.Do(func() {
+			v.ok = false
+			defer func() {
+				v.p = recover()
+				if !v.ok {
+					panic(v.p)
+				}
+			}()
+			v.err = v.f(ctx)
+			v.ok = true
+		})
+		if !v.ok {
+			panic(v.p)
+		}
+		return v.err
+	}
+
+	return FuncResetter{
+		f:     ff,
+		reset: v.once.Reset,
+	}
+}
+
+type doNotCopy struct{}
+
+// Lock is a no-op used by -copylocks checker from `go vet`.
+func (*doNotCopy) Lock()   {}
+func (*doNotCopy) Unlock() {}

common/hsync/oncemore_test.go

@@ -0,0 +1,80 @@
+// Copyright 2025 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hsync
+
+import (
+	"context"
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestOnceMoreValue(t *testing.T) {
+	c := qt.New(t)
+
+	var counter int
+	f := func(context.Context) int {
+		counter++
+		return counter
+	}
+
+	omf := OnceMoreValue(f)
+	for range 10 {
+		c.Assert(omf.Value(context.Background()), qt.Equals, 1)
+	}
+	omf.Reset()
+	for range 10 {
+		c.Assert(omf.Value(context.Background()), qt.Equals, 2)
+	}
+}
+
+func TestOnceMoreFunc(t *testing.T) {
+	c := qt.New(t)
+
+	var counter int
+	f := func(context.Context) error {
+		counter++
+		return nil
+	}
+
+	omf := OnceMoreFunc(f)
+	for range 10 {
+		c.Assert(omf.Do(context.Background()), qt.IsNil)
+		c.Assert(counter, qt.Equals, 1)
+	}
+	omf.Reset()
+	for range 10 {
+		c.Assert(omf.Do(context.Background()), qt.IsNil)
+		c.Assert(counter, qt.Equals, 2)
+	}
+}
+
+func BenchmarkOnceMoreValue(b *testing.B) {
+	var counter int
+	f := func(context.Context) int {
+		counter++
+		return counter
+	}
+
+	for b.Loop() {
+		omf := OnceMoreValue(f)
+		for range 10 {
+			omf.Value(context.Background())
+		}
+		omf.Reset()
+		for range 10 {
+			omf.Value(context.Background())
+		}
+	}
+}

common/htime/htime_integration_test.go

@@ -24,9 +24,9 @@ func TestApplyWithContext(t *testing.T) {
 	t.Parallel()
 
 	files := `
--- config.toml --
+-- hugo.toml --
 defaultContentLanguage = 'it'
--- layouts/index.html --
+-- layouts/home.html --
 {{ $dates := slice
   "2022-01-03"
   "2022-02-01"

common/htime/time_test.go

@@ -112,7 +112,7 @@ func BenchmarkTimeFormatter(b *testing.B) {
 	june06, _ := time.Parse("2006-Jan-02", "2018-Jun-06")
 
 	b.Run("Native", func(b *testing.B) {
-		for i := 0; i < b.N; i++ {
+		for b.Loop() {
 			got := june06.Format("Monday Jan 2 2006")
 			if got != "Wednesday Jun 6 2018" {
 				b.Fatalf("invalid format, got %q", got)
@@ -123,7 +123,7 @@ func BenchmarkTimeFormatter(b *testing.B) {
 	b.Run("Localized", func(b *testing.B) {
 		f := NewTimeFormatter(translators.GetTranslator("nn"))
 		b.ResetTimer()
-		for i := 0; i < b.N; i++ {
+		for b.Loop() {
 			got := f.Format(june06, "Monday Jan 2 2006")
 			if got != "onsdag juni 6 2018" {
 				b.Fatalf("invalid format, got %q", got)
@@ -134,7 +134,7 @@ func BenchmarkTimeFormatter(b *testing.B) {
 	b.Run("Localized Custom", func(b *testing.B) {
 		f := NewTimeFormatter(translators.GetTranslator("nn"))
 		b.ResetTimer()
-		for i := 0; i < b.N; i++ {
+		for b.Loop() {
 			got := f.Format(june06, ":date_medium")
 			if got != "6. juni 2018" {
 				b.Fatalf("invalid format, got %q", got)

common/hugio/hasBytesWriter_test.go

@@ -46,7 +46,7 @@ func TestHasBytesWriter(t *testing.T) {
 		return strings.Repeat("ab cfo", r.Intn(33))
 	}
 
-	for i := 0; i < 22; i++ {
+	for range 22 {
 		h, w := neww()
 		fmt.Fprint(w, rndStr()+"abc __foobar"+rndStr())
 		c.Assert(h.Patterns[0].Match, qt.Equals, true)

common/hugio/readers.go

@@ -32,6 +32,37 @@ type ReadSeekCloser interface {
 	io.Closer
 }
 
+// Sizer provides the size of, typically, a io.Reader.
+// As implemented by e.g. os.File and io.SectionReader.
+type Sizer interface {
+	Size() int64
+}
+
+type SizeReader interface {
+	io.Reader
+	Sizer
+}
+
+// ToSizeReader converts the given io.Reader to a SizeReader.
+// Note that if r is not a SizeReader, the entire content will be read into memory
+func ToSizeReader(r io.Reader) (SizeReader, error) {
+	if sr, ok := r.(SizeReader); ok {
+		return sr, nil
+	}
+	b, err := io.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+	return bytes.NewReader(b), nil
+}
+
+// CloserFunc is an adapter to allow the use of ordinary functions as io.Closers.
+type CloserFunc func() error
+
+func (f CloserFunc) Close() error {
+	return f()
+}
+
 // ReadSeekCloserProvider provides a ReadSeekCloser.
 type ReadSeekCloserProvider interface {
 	ReadSeekCloser() (ReadSeekCloser, error)

common/hugo/hugo.go

@@ -28,12 +28,14 @@ import (
 	"github.com/bep/logg"
 
 	"github.com/bep/godartsass/v2"
-	"github.com/gohugoio/hugo/common/hcontext"
+
 	"github.com/gohugoio/hugo/common/hexec"
+	"github.com/gohugoio/hugo/common/hstore"
 	"github.com/gohugoio/hugo/common/loggers"
-	"github.com/gohugoio/hugo/common/maps"
+	"github.com/gohugoio/hugo/common/version"
 	"github.com/gohugoio/hugo/hugofs/files"
 
+	"github.com/bep/helpers/contexthelpers"
 	"github.com/spf13/afero"
 
 	iofs "io/fs"
@@ -54,7 +56,7 @@ var (
 	vendorInfo string
 )
 
-var _ maps.StoreProvider = (*HugoInfo)(nil)
+var _ hstore.StoreProvider = (*HugoInfo)(nil)
 
 // HugoInfo contains information about the current Hugo environment
 type HugoInfo struct {
@@ -73,14 +75,14 @@ type HugoInfo struct {
 	conf ConfigProvider
 	deps []*Dependency
 
-	store *maps.Scratch
+	store *hstore.Scratch
 
 	// Context gives access to some of the context scoped variables.
 	Context Context
 }
 
 // Version returns the current version as a comparable version string.
-func (i HugoInfo) Version() VersionString {
+func (i HugoInfo) Version() version.VersionString {
 	return CurrentVersion.Version()
 }
 
@@ -119,7 +121,7 @@ func (i HugoInfo) Deps() []*Dependency {
 	return i.deps
 }
 
-func (i HugoInfo) Store() *maps.Scratch {
+func (i HugoInfo) Store() *hstore.Scratch {
 	return i.store
 }
 
@@ -139,9 +141,13 @@ func (i HugoInfo) IsMultilingual() bool {
 	return i.conf.IsMultilingual()
 }
 
-type contextKey string
+type contextKey uint8
 
-var markupScope = hcontext.NewContextDispatcher[string](contextKey("markupScope"))
+const (
+	contextKeyMarkupScope contextKey = iota
+)
+
+var markupScope = contexthelpers.NewContextDispatcher[string](contextKeyMarkupScope)
 
 type Context struct{}
 
@@ -192,7 +198,7 @@ func NewInfo(conf ConfigProvider, deps []*Dependency) HugoInfo {
 		Environment: conf.Environment(),
 		conf:        conf,
 		deps:        deps,
-		store:       maps.NewScratch(),
+		store:       hstore.NewScratch(),
 		GoVersion:   goVersion,
 	}
 }
@@ -304,13 +310,12 @@ func GetDependencyList() []string {
 
 // GetDependencyListNonGo returns a list of non-Go dependencies.
 func GetDependencyListNonGo() []string {
-	var deps []string
+	deps := []string{formatDep("github.com/webmproject/libwebp", "v1.6.0")} // via WASM. TODO(bep) get versions from the plugin setup.
 
 	if IsExtended {
 		deps = append(
 			deps,
 			formatDep("github.com/sass/libsass", "3.6.6"),
-			formatDep("github.com/webmproject/libwebp", "v1.3.2"),
 		)
 	}
 
@@ -411,36 +416,96 @@ func IsDartSassGeV2() bool {
 // 2. Their theme to work for at least the last few Hugo versions.
 func Deprecate(item, alternative string, version string) {
 	level := deprecationLogLevelFromVersion(version)
-	DeprecateLevel(item, alternative, version, level)
+	deprecateLevel(item, alternative, version, level)
+}
+
+// See Deprecate for details.
+func DeprecateWithLogger(item, alternative string, version string, log logg.Logger) {
+	level := deprecationLogLevelFromVersion(version)
+	deprecateLevelWithLogger(item, alternative, version, level, log)
+}
+
+// DeprecateLevelMin informs about a deprecation starting at the given version, but with a minimum log level.
+func DeprecateLevelMin(item, alternative string, version string, minLevel logg.Level) {
+	level := max(deprecationLogLevelFromVersion(version), minLevel)
+	deprecateLevel(item, alternative, version, level)
+}
+
+// deprecateLevel informs about a deprecation logging at the given level.
+func deprecateLevel(item, alternative, version string, level logg.Level) {
+	deprecateLevelWithLogger(item, alternative, version, level, loggers.Log().Logger())
 }
 
 // DeprecateLevel informs about a deprecation logging at the given level.
-func DeprecateLevel(item, alternative, version string, level logg.Level) {
+func deprecateLevelWithLogger(item, alternative, version string, level logg.Level, log logg.Logger) {
 	var msg string
 	if level == logg.LevelError {
-		msg = fmt.Sprintf("%s was deprecated in Hugo %s and will be removed in Hugo %s. %s", item, version, CurrentVersion.Next().ReleaseVersion(), alternative)
+		msg = fmt.Sprintf("%s was deprecated in Hugo %s and subsequently removed. %s", item, version, alternative)
 	} else {
 		msg = fmt.Sprintf("%s was deprecated in Hugo %s and will be removed in a future release. %s", item, version, alternative)
 	}
 
-	loggers.Log().Logger().WithLevel(level).WithField(loggers.FieldNameCmd, "deprecated").Logf("%s", msg)
+	log.WithLevel(level).WithField(loggers.FieldNameCmd, "deprecated").Logf("%s", msg)
 }
 
 // We usually do about one minor version a month.
 // We want people to run at least the current and previous version without any warnings.
 // We want people who don't update Hugo that often to see the warnings and errors before we remove the feature.
 func deprecationLogLevelFromVersion(ver string) logg.Level {
-	from := MustParseVersion(ver)
+	from := version.MustParseVersion(ver)
 	to := CurrentVersion
 	minorDiff := to.Minor - from.Minor
 	switch {
-	case minorDiff >= 12:
-		// Start failing the build after about a year.
+	case minorDiff >= 15:
+		// Start failing the build after about 15 months.
 		return logg.LevelError
-	case minorDiff >= 6:
-		// Start printing warnings after about six months.
+	case minorDiff >= 3:
+		// Start printing warnings after about 3 months.
 		return logg.LevelWarn
 	default:
 		return logg.LevelInfo
 	}
 }
+
+// BuildVersionString creates a version string. This is what you see when
+// running "hugo version".
+func BuildVersionString() string {
+	// program := "Hugo Static Site Generator"
+	program := "hugo"
+
+	version := "v" + CurrentVersion.String()
+
+	bi := getBuildInfo()
+	if bi == nil {
+		return version
+	}
+	if bi.Revision != "" {
+		version += "-" + bi.Revision
+	}
+	if IsExtended {
+		version += "+extended"
+	}
+	if IsWithdeploy {
+		version += "+withdeploy"
+	}
+
+	osArch := bi.GoOS + "/" + bi.GoArch
+
+	date := bi.RevisionTime
+	if date == "" {
+		// Accept vendor-specified build date if .git/ is unavailable.
+		date = buildDate
+	}
+	if date == "" {
+		date = "unknown"
+	}
+
+	versionString := fmt.Sprintf("%s %s %s BuildDate=%s",
+		program, version, osArch, date)
+
+	if vendorInfo != "" {
+		versionString += " VendorInfo=" + vendorInfo
+	}
+
+	return versionString
+}

common/hugo/hugo_integration_test.go

@@ -35,7 +35,7 @@ baseURL = 'https://en.example.org/'
 ---
 title: home
 ---
--- layouts/index.html --
+-- layouts/home.html --
 multilingual={{ hugo.IsMultilingual }}
 multihost={{ hugo.IsMultihost }}
   `

common/hugo/hugo_test.go

@@ -20,6 +20,7 @@ import (
 
 	"github.com/bep/logg"
 	qt "github.com/frankban/quicktest"
+	"github.com/gohugoio/hugo/common/version"
 )
 
 func TestHugoInfo(t *testing.T) {
@@ -29,7 +30,7 @@ func TestHugoInfo(t *testing.T) {
 	hugoInfo := NewInfo(conf, nil)
 
 	c.Assert(hugoInfo.Version(), qt.Equals, CurrentVersion.Version())
-	c.Assert(fmt.Sprintf("%T", VersionString("")), qt.Equals, fmt.Sprintf("%T", hugoInfo.Version()))
+	c.Assert(fmt.Sprintf("%T", version.VersionString("")), qt.Equals, fmt.Sprintf("%T", hugoInfo.Version()))
 	c.Assert(hugoInfo.WorkingDir(), qt.Equals, "/mywork")
 
 	bi := getBuildInfo()
@@ -57,11 +58,11 @@ func TestDeprecationLogLevelFromVersion(t *testing.T) {
 	c.Assert(deprecationLogLevelFromVersion("0.55.0"), qt.Equals, logg.LevelError)
 	ver := CurrentVersion
 	c.Assert(deprecationLogLevelFromVersion(ver.String()), qt.Equals, logg.LevelInfo)
-	ver.Minor -= 1
-	c.Assert(deprecationLogLevelFromVersion(ver.String()), qt.Equals, logg.LevelInfo)
-	ver.Minor -= 6
+	ver.Minor -= 3
 	c.Assert(deprecationLogLevelFromVersion(ver.String()), qt.Equals, logg.LevelWarn)
-	ver.Minor -= 6
+	ver.Minor -= 4
+	c.Assert(deprecationLogLevelFromVersion(ver.String()), qt.Equals, logg.LevelWarn)
+	ver.Minor -= 13
 	c.Assert(deprecationLogLevelFromVersion(ver.String()), qt.Equals, logg.LevelError)
 
 	// Added just to find the threshold for where we can remove deprecated items.

common/hugo/vars_extended.go

@@ -12,7 +12,6 @@
 // limitations under the License.
 
 //go:build extended
-// +build extended
 
 package hugo
 

common/hugo/vars_regular.go

@@ -12,7 +12,6 @@
 // limitations under the License.
 
 //go:build !extended
-// +build !extended
 
 package hugo
 

common/hugo/vars_withdeploy.go

@@ -12,7 +12,6 @@
 // limitations under the License.
 
 //go:build withdeploy
-// +build withdeploy
 
 package hugo
 

common/hugo/vars_withdeploy_off.go

@@ -12,7 +12,6 @@
 // limitations under the License.
 
 //go:build !withdeploy
-// +build !withdeploy
 
 package hugo
 

common/hugo/version_current.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2025 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -13,11 +13,13 @@
 
 package hugo
 
+import "github.com/gohugoio/hugo/common/version"
+
 // CurrentVersion represents the current build version.
 // This should be the only one.
-var CurrentVersion = Version{
+var CurrentVersion = version.Version{
 	Major:      0,
-	Minor:      143,
-	PatchLevel: 0,
-	Suffix:     "-DEV",
+	Minor:      155,
+	PatchLevel: 1,
+	Suffix:     "",
 }

common/loggers/logger_test.go

@@ -37,7 +37,7 @@ func TestLogDistinct(t *testing.T) {
 
 	l := loggers.New(opts)
 
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		l.Errorln("error 1")
 		l.Errorln("error 2")
 		l.Warnln("warn 1")
@@ -137,7 +137,7 @@ func TestReset(t *testing.T) {
 
 	l := loggers.New(opts)
 
-	for i := 0; i < 3; i++ {
+	for range 3 {
 		l.Errorln("error 1")
 		l.Errorln("error 2")
 		l.Errorln("error 1")

common/loggers/loggerglobal.go

@@ -21,7 +21,15 @@ import (
 	"github.com/bep/logg"
 )
 
-func InitGlobalLogger(level logg.Level, panicOnWarnings bool) {
+// SetGlobalLogger sets the global logger.
+// This is used in a few places in Hugo, e.g. deprecated functions.
+func SetGlobalLogger(logger Logger) {
+	logMu.Lock()
+	defer logMu.Unlock()
+	log = logger
+}
+
+func initGlobalLogger(level logg.Level, panicOnWarnings bool) {
 	logMu.Lock()
 	defer logMu.Unlock()
 	var logHookLast func(e *logg.Entry) error
@@ -50,5 +58,5 @@ func Log() Logger {
 var log Logger
 
 func init() {
-	InitGlobalLogger(logg.LevelWarn, false)
+	initGlobalLogger(logg.LevelWarn, false)
 }

common/para/para_test.go

@@ -42,7 +42,7 @@ func TestPara(t *testing.T) {
 	c.Run("Order", func(c *qt.C) {
 		n := 500
 		ints := make([]int, n)
-		for i := 0; i < n; i++ {
+		for i := range n {
 			ints[i] = i
 		}
 
@@ -51,8 +51,7 @@ func TestPara(t *testing.T) {
 
 		var result []int
 		var mu sync.Mutex
-		for i := 0; i < n; i++ {
-			i := i
+		for i := range n {
 			r.Run(func() error {
 				mu.Lock()
 				defer mu.Unlock()
@@ -78,7 +77,7 @@ func TestPara(t *testing.T) {
 
 		var counter int64
 
-		for i := 0; i < n; i++ {
+		for range n {
 			r.Run(func() error {
 				atomic.AddInt64(&counter, 1)
 				time.Sleep(1 * time.Millisecond)

common/paths/path.go

@@ -115,8 +115,8 @@ func ReplaceExtension(path string, newExt string) string {
 
 func makePathRelative(inPath string, possibleDirectories ...string) (string, error) {
 	for _, currentPath := range possibleDirectories {
-		if strings.HasPrefix(inPath, currentPath) {
-			return strings.TrimPrefix(inPath, currentPath), nil
+		if after, ok := strings.CutPrefix(inPath, currentPath); ok {
+			return after, nil
 		}
 	}
 	return inPath, errors.New("can't extract relative path, unknown prefix")

common/paths/path_test.go

@@ -225,7 +225,7 @@ func BenchmarkSanitize(b *testing.B) {
 
 	// This should not allocate any memory.
 	b.Run("All allowed", func(b *testing.B) {
-		for i := 0; i < b.N; i++ {
+		for b.Loop() {
 			got := Sanitize(allAlowedPath)
 			if got != allAlowedPath {
 				b.Fatal(got)
@@ -235,7 +235,7 @@ func BenchmarkSanitize(b *testing.B) {
 
 	// This will allocate some memory.
 	b.Run("Spaces", func(b *testing.B) {
-		for i := 0; i < b.N; i++ {
+		for b.Loop() {
 			got := Sanitize(spacePath)
 			if got != "foo-bar" {
 				b.Fatal(got)
@@ -311,3 +311,61 @@ func TestIsSameFilePath(t *testing.T) {
 		c.Assert(IsSameFilePath(filepath.FromSlash(this.a), filepath.FromSlash(this.b)), qt.Equals, this.expected, qt.Commentf("a: %s b: %s", this.a, this.b))
 	}
 }
+
+func BenchmarkAddLeadingSlash(b *testing.B) {
+	const (
+		noLeadingSlash   = "a/b/c"
+		withLeadingSlash = "/a/b/c"
+	)
+
+	// This should not allocate any memory.
+	b.Run("With leading slash", func(b *testing.B) {
+		for b.Loop() {
+			got := AddLeadingSlash(withLeadingSlash)
+			if got != withLeadingSlash {
+				b.Fatal(got)
+			}
+		}
+	})
+
+	// This will allocate some memory.
+	b.Run("Without leading slash", func(b *testing.B) {
+		for b.Loop() {
+			got := AddLeadingSlash(noLeadingSlash)
+			if got != "/a/b/c" {
+				b.Fatal(got)
+			}
+		}
+	})
+
+	b.Run("Blank string", func(b *testing.B) {
+		for b.Loop() {
+			got := AddLeadingSlash("")
+			if got != "/" {
+				b.Fatal(got)
+			}
+		}
+	})
+}
+
+func TestPathEscape(t *testing.T) {
+	c := qt.New(t)
+
+	for _, this := range []struct {
+		input    string
+		expected string
+	}{
+		{"/tags/欢迎", "/tags/%E6%AC%A2%E8%BF%8E"},
+		{"/path with spaces", "/path%20with%20spaces"},
+		{"/simple-path", "/simple-path"},
+		{"/path/with/slash", "/path/with/slash"},
+		{"/path/with special&chars", "/path/with%20special&chars"},
+	} {
+		in := this.input
+		for range 2 {
+			result := PathEscape(in)
+			c.Assert(result, qt.Equals, this.expected, qt.Commentf("input: %q", this.input))
+			in = result // test idempotency
+		}
+	}
+}

common/paths/pathparser.go

@@ -14,18 +14,27 @@
 package paths
 
 import (
+	"fmt"
 	"path"
 	"path/filepath"
 	"runtime"
 	"strings"
 	"sync"
 
+	"github.com/gohugoio/hugo/common/hmaps"
 	"github.com/gohugoio/hugo/common/types"
 	"github.com/gohugoio/hugo/hugofs/files"
+	"github.com/gohugoio/hugo/hugolib/sitesmatrix"
 	"github.com/gohugoio/hugo/identity"
+	"github.com/gohugoio/hugo/resources/kinds"
 )
 
-// PathParser parses a path into a Path.
+const (
+	identifierBaseof         = "baseof"
+	identifierCurstomWrapper = "_"
+)
+
+// PathParser parses and manages paths.
 type PathParser struct {
 	// Maps the language code to its index in the languages/sites slice.
 	LanguageIndex map[string]int
@@ -33,8 +42,25 @@ type PathParser struct {
 	// Reports whether the given language is disabled.
 	IsLangDisabled func(string) bool
 
+	// IsOutputFormat reports whether the given name is a valid output format.
+	// The second argument is optional.
+	IsOutputFormat func(name, ext string) bool
+
 	// Reports whether the given ext is a content file.
 	IsContentExt func(string) bool
+
+	// The configured sites matrix.
+	ConfiguredDimensions *sitesmatrix.ConfiguredDimensions
+
+	// Below gets created on demand.
+	initOnce         sync.Once
+	sitesMatrixCache *hmaps.Cache[string, sitesmatrix.VectorStore] // Maps language index to sites matrix vector store.
+}
+
+func (pp *PathParser) init() {
+	pp.initOnce.Do(func() {
+		pp.sitesMatrixCache = hmaps.NewCache[string, sitesmatrix.VectorStore]()
+	})
 }
 
 // NormalizePathString returns a normalized path string using the very basic Hugo rules.
@@ -48,6 +74,32 @@ func NormalizePathStringBasic(s string) string {
 	return s
 }
 
+func (pp *PathParser) SitesMatrixFromPath(p *Path) sitesmatrix.VectorStore {
+	pp.init()
+	lang := p.Lang()
+	v, _ := pp.sitesMatrixCache.GetOrCreate(lang, func() (sitesmatrix.VectorStore, error) {
+		builder := sitesmatrix.NewIntSetsBuilder(pp.ConfiguredDimensions)
+		if lang != "" {
+			if idx, ok := pp.LanguageIndex[lang]; ok {
+				builder.WithLanguageIndices(idx)
+			}
+		}
+
+		switch p.Component() {
+		case files.ComponentFolderContent:
+			builder.WithDefaultsIfNotSet()
+		case files.ComponentFolderLayouts:
+			builder.WithAllIfNotSet()
+		case files.ComponentFolderStatic:
+			builder.WithDefaultsAndAllLanguagesIfNotSet()
+		}
+
+		return builder.Build(), nil
+	})
+
+	return v
+}
+
 // ParseIdentity parses component c with path s into a StringIdentity.
 func (pp *PathParser) ParseIdentity(c, s string) identity.StringIdentity {
 	p := pp.parsePooled(c, s)
@@ -83,13 +135,10 @@ func (pp *PathParser) Parse(c, s string) *Path {
 }
 
 func (pp *PathParser) newPath(component string) *Path {
-	return &Path{
-		component:             component,
-		posContainerLow:       -1,
-		posContainerHigh:      -1,
-		posSectionHigh:        -1,
-		posIdentifierLanguage: -1,
-	}
+	p := &Path{}
+	p.reset()
+	p.component = component
+	return p
 }
 
 func (pp *PathParser) parse(component, s string) (*Path, error) {
@@ -114,10 +163,114 @@ func (pp *PathParser) parse(component, s string) (*Path, error) {
 	return p, nil
 }
 
-func (pp *PathParser) doParse(component, s string, p *Path) (*Path, error) {
-	hasLang := pp.LanguageIndex != nil
-	hasLang = hasLang && (component == files.ComponentFolderContent || component == files.ComponentFolderLayouts)
+func (pp *PathParser) parseIdentifier(component, s string, p *Path, i, lastDot, numDots int, isLast bool) {
+	if p.posContainerHigh != -1 {
+		return
+	}
+	mayHaveLang := numDots > 1 && p.posIdentifierLanguage == -1 && pp.LanguageIndex != nil
+	mayHaveLang = mayHaveLang && (component == files.ComponentFolderContent || component == files.ComponentFolderLayouts)
+	mayHaveOutputFormat := component == files.ComponentFolderLayouts
+	mayHaveKind := p.posIdentifierKind == -1 && mayHaveOutputFormat
+	var mayHaveLayout bool
+	if p.pathType == TypeShortcode {
+		mayHaveLayout = !isLast && component == files.ComponentFolderLayouts
+	} else {
+		mayHaveLayout = component == files.ComponentFolderLayouts
+	}
 
+	var found bool
+	var high int
+	if len(p.identifiersKnown) > 0 {
+		high = lastDot
+	} else {
+		high = len(p.s)
+	}
+	id := types.LowHigh[string]{Low: i + 1, High: high}
+	sid := p.s[id.Low:id.High]
+
+	if strings.HasPrefix(sid, identifierCurstomWrapper) && strings.HasSuffix(sid, identifierCurstomWrapper) {
+		p.identifiersKnown = append(p.identifiersKnown, id)
+		p.posIdentifierCustom = len(p.identifiersKnown) - 1
+		found = true
+	}
+
+	if len(p.identifiersKnown) == 0 {
+		// The first is always the extension.
+		p.identifiersKnown = append(p.identifiersKnown, id)
+		found = true
+
+		// May also be the output format.
+		if mayHaveOutputFormat && pp.IsOutputFormat(sid, "") {
+			p.posIdentifierOutputFormat = 0
+		}
+	} else {
+		var langFound bool
+
+		if mayHaveLang {
+			var disabled bool
+			_, langFound = pp.LanguageIndex[sid]
+
+			if !langFound {
+				disabled = pp.IsLangDisabled != nil && pp.IsLangDisabled(sid)
+				if disabled {
+					p.disabled = true
+					langFound = true
+				}
+			}
+			found = langFound
+			if langFound {
+				p.identifiersKnown = append(p.identifiersKnown, id)
+				p.posIdentifierLanguage = len(p.identifiersKnown) - 1
+			}
+
+		}
+
+		if !found && mayHaveOutputFormat {
+			// At this point we may already have resolved an output format,
+			// but we need to keep looking for a more specific one, e.g. amp before html.
+			// Use both name and extension to prevent
+			// false positives on the form css.html.
+			if pp.IsOutputFormat(sid, p.Ext()) {
+				found = true
+				p.identifiersKnown = append(p.identifiersKnown, id)
+				p.posIdentifierOutputFormat = len(p.identifiersKnown) - 1
+			}
+		}
+
+		if !found && mayHaveKind {
+			if kinds.GetKindMain(sid) != "" {
+				found = true
+				p.identifiersKnown = append(p.identifiersKnown, id)
+				p.posIdentifierKind = len(p.identifiersKnown) - 1
+			}
+		}
+
+		if !found && sid == identifierBaseof {
+			found = true
+			p.identifiersKnown = append(p.identifiersKnown, id)
+			p.posIdentifierBaseof = len(p.identifiersKnown) - 1
+		}
+
+		if !found && mayHaveLayout {
+			if p.posIdentifierLayout != -1 {
+				// Move it to identifiersUnknown.
+				p.identifiersUnknown = append(p.identifiersUnknown, p.identifiersKnown[p.posIdentifierLayout])
+				p.identifiersKnown[p.posIdentifierLayout] = id
+			} else {
+				p.identifiersKnown = append(p.identifiersKnown, id)
+				p.posIdentifierLayout = len(p.identifiersKnown) - 1
+			}
+			found = true
+		}
+
+		if !found {
+			p.identifiersUnknown = append(p.identifiersUnknown, id)
+		}
+
+	}
+}
+
+func (pp *PathParser) doParse(component, s string, p *Path) (*Path, error) {
 	if runtime.GOOS == "windows" {
 		s = path.Clean(filepath.ToSlash(s))
 		if s == "." {
@@ -140,46 +293,26 @@ func (pp *PathParser) doParse(component, s string, p *Path) (*Path, error) {
 
 	p.s = s
 	slashCount := 0
+	lastDot := 0
+	lastSlashIdx := strings.LastIndex(s, "/")
+	numDots := strings.Count(s[lastSlashIdx+1:], ".")
+	if strings.Contains(s, "/_shortcodes/") {
+		p.pathType = TypeShortcode
+	}
 
 	for i := len(s) - 1; i >= 0; i-- {
 		c := s[i]
 
 		switch c {
 		case '.':
-			if p.posContainerHigh == -1 {
-				var high int
-				if len(p.identifiers) > 0 {
-					high = p.identifiers[len(p.identifiers)-1].Low - 1
-				} else {
-					high = len(p.s)
-				}
-				id := types.LowHigh[string]{Low: i + 1, High: high}
-				if len(p.identifiers) == 0 {
-					p.identifiers = append(p.identifiers, id)
-				} else if len(p.identifiers) == 1 {
-					// Check for a valid language.
-					s := p.s[id.Low:id.High]
-
-					if hasLang {
-						var disabled bool
-						_, langFound := pp.LanguageIndex[s]
-						if !langFound {
-							disabled = pp.IsLangDisabled != nil && pp.IsLangDisabled(s)
-							if disabled {
-								p.disabled = true
-								langFound = true
-							}
-						}
-						if langFound {
-							p.posIdentifierLanguage = 1
-							p.identifiers = append(p.identifiers, id)
-						}
-					}
-				}
-			}
+			pp.parseIdentifier(component, s, p, i, lastDot, numDots, false)
+			lastDot = i
 		case '/':
 			slashCount++
 			if p.posContainerHigh == -1 {
+				if lastDot > 0 {
+					pp.parseIdentifier(component, s, p, i, lastDot, numDots, true)
+				}
 				p.posContainerHigh = i + 1
 			} else if p.posContainerLow == -1 {
 				p.posContainerLow = i + 1
@@ -190,26 +323,52 @@ func (pp *PathParser) doParse(component, s string, p *Path) (*Path, error) {
 		}
 	}
 
-	if len(p.identifiers) > 0 {
+	if len(p.identifiersKnown) > 0 {
 		isContentComponent := p.component == files.ComponentFolderContent || p.component == files.ComponentFolderArchetypes
 		isContent := isContentComponent && pp.IsContentExt(p.Ext())
-		id := p.identifiers[len(p.identifiers)-1]
-		b := p.s[p.posContainerHigh : id.Low-1]
-		if isContent {
-			switch b {
-			case "index":
-				p.bundleType = PathTypeLeaf
-			case "_index":
-				p.bundleType = PathTypeBranch
-			default:
-				p.bundleType = PathTypeContentSingle
-			}
+		id := p.identifiersKnown[len(p.identifiersKnown)-1]
 
-			if slashCount == 2 && p.IsLeafBundle() {
-				p.posSectionHigh = 0
+		if id.Low > p.posContainerHigh {
+			b := p.s[p.posContainerHigh : id.Low-1]
+			if isContent {
+				switch b {
+				case "index":
+					p.pathType = TypeLeaf
+				case "_index":
+					p.pathType = TypeBranch
+				default:
+					p.pathType = TypeContentSingle
+				}
+
+				if slashCount == 2 && p.IsLeafBundle() {
+					p.posSectionHigh = 0
+				}
+			} else if b == files.NameContentData && files.IsContentDataExt(p.Ext()) {
+				p.pathType = TypeContentData
 			}
-		} else if b == files.NameContentData && files.IsContentDataExt(p.Ext()) {
-			p.bundleType = PathTypeContentData
+		}
+	}
+
+	if p.pathType < TypeMarkup && component == files.ComponentFolderLayouts {
+		if p.posIdentifierBaseof != -1 {
+			p.pathType = TypeBaseof
+		} else {
+			pth := p.Path()
+			if strings.Contains(pth, "/_shortcodes/") {
+				p.pathType = TypeShortcode
+			} else if strings.Contains(pth, "/_markup/") {
+				p.pathType = TypeMarkup
+			} else if strings.HasPrefix(pth, "/_partials/") {
+				p.pathType = TypePartial
+			}
+		}
+	}
+
+	if p.pathType == TypeShortcode && p.posIdentifierLayout != -1 {
+		id := p.identifiersKnown[p.posIdentifierLayout]
+		if id.Low == p.posContainerHigh {
+			// First identifier is shortcode name.
+			p.posIdentifierLayout = -1
 		}
 	}
 
@@ -218,35 +377,44 @@ func (pp *PathParser) doParse(component, s string, p *Path) (*Path, error) {
 
 func ModifyPathBundleTypeResource(p *Path) {
 	if p.IsContent() {
-		p.bundleType = PathTypeContentResource
+		p.pathType = TypeContentResource
 	} else {
-		p.bundleType = PathTypeFile
+		p.pathType = TypeFile
 	}
 }
 
-type PathType int
+//go:generate stringer -type Type
+
+type Type int
 
 const (
-	// A generic resource, e.g. a JSON file.
-	PathTypeFile PathType = iota
+
+	// A generic file, e.g. a JSON file.
+	TypeFile Type = iota
 
 	// All below are content files.
 	// A resource of a content type with front matter.
-	PathTypeContentResource
+	TypeContentResource
 
 	// E.g. /blog/my-post.md
-	PathTypeContentSingle
+	TypeContentSingle
 
 	// All below are bundled content files.
 
 	// Leaf bundles, e.g. /blog/my-post/index.md
-	PathTypeLeaf
+	TypeLeaf
 
 	// Branch bundles, e.g. /blog/_index.md
-	PathTypeBranch
+	TypeBranch
 
 	// Content data file, _content.gotmpl.
-	PathTypeContentData
+	TypeContentData
+
+	// Layout types.
+	TypeMarkup
+	TypeShortcode
+	TypePartial
+	TypeBaseof
 )
 
 type Path struct {
@@ -257,13 +425,19 @@ type Path struct {
 	posContainerHigh int
 	posSectionHigh   int
 
-	component  string
-	bundleType PathType
+	component string
+	pathType  Type
 
-	identifiers []types.LowHigh[string]
+	identifiersKnown   []types.LowHigh[string]
+	identifiersUnknown []types.LowHigh[string]
 
-	posIdentifierLanguage int
-	disabled              bool
+	posIdentifierLanguage     int
+	posIdentifierOutputFormat int
+	posIdentifierKind         int
+	posIdentifierLayout       int
+	posIdentifierBaseof       int
+	posIdentifierCustom       int
+	disabled                  bool
 
 	trimLeadingSlash bool
 
@@ -293,9 +467,14 @@ func (p *Path) reset() {
 	p.posContainerHigh = -1
 	p.posSectionHigh = -1
 	p.component = ""
-	p.bundleType = 0
-	p.identifiers = p.identifiers[:0]
+	p.pathType = 0
+	p.identifiersKnown = p.identifiersKnown[:0]
 	p.posIdentifierLanguage = -1
+	p.posIdentifierOutputFormat = -1
+	p.posIdentifierKind = -1
+	p.posIdentifierLayout = -1
+	p.posIdentifierBaseof = -1
+	p.posIdentifierCustom = -1
 	p.disabled = false
 	p.trimLeadingSlash = false
 	p.unnormalized = nil
@@ -316,6 +495,9 @@ func (p *Path) norm(s string) string {
 
 // IdentifierBase satisfies identity.Identity.
 func (p *Path) IdentifierBase() string {
+	if p.Component() == files.ComponentFolderLayouts {
+		return p.Path()
+	}
 	return p.Base()
 }
 
@@ -332,6 +514,13 @@ func (p *Path) Container() string {
 	return p.norm(p.s[p.posContainerLow : p.posContainerHigh-1])
 }
 
+func (p *Path) String() string {
+	if p == nil {
+		return "<nil>"
+	}
+	return p.Path()
+}
+
 // ContainerDir returns the container directory for this path.
 // For content bundles this will be the parent directory.
 func (p *Path) ContainerDir() string {
@@ -352,13 +541,13 @@ func (p *Path) Section() string {
 // IsContent returns true if the path is a content file (e.g. mypost.md).
 // Note that this will also return true for content files in a bundle.
 func (p *Path) IsContent() bool {
-	return p.BundleType() >= PathTypeContentResource
+	return p.Type() >= TypeContentResource && p.Type() <= TypeContentData
 }
 
 // isContentPage returns true if the path is a content file (e.g. mypost.md),
 // but nof if inside a leaf bundle.
 func (p *Path) isContentPage() bool {
-	return p.BundleType() >= PathTypeContentSingle
+	return p.Type() >= TypeContentSingle && p.Type() <= TypeContentData
 }
 
 // Name returns the last element of path.
@@ -372,7 +561,7 @@ func (p *Path) Name() string {
 // Name returns the last element of path without any extension.
 func (p *Path) NameNoExt() string {
 	if i := p.identifierIndex(0); i != -1 {
-		return p.s[p.posContainerHigh : p.identifiers[i].Low-1]
+		return p.s[p.posContainerHigh : p.identifiersKnown[i].Low-1]
 	}
 	return p.s[p.posContainerHigh:]
 }
@@ -384,7 +573,7 @@ func (p *Path) NameNoLang() string {
 		return p.Name()
 	}
 
-	return p.s[p.posContainerHigh:p.identifiers[i].Low-1] + p.s[p.identifiers[i].High:]
+	return p.s[p.posContainerHigh:p.identifiersKnown[i].Low-1] + p.s[p.identifiersKnown[i].High:]
 }
 
 // BaseNameNoIdentifier returns the logical base name for a resource without any identifier (e.g. no extension).
@@ -398,10 +587,26 @@ func (p *Path) BaseNameNoIdentifier() string {
 
 // NameNoIdentifier returns the last element of path without any identifier (e.g. no extension).
 func (p *Path) NameNoIdentifier() string {
-	if len(p.identifiers) > 0 {
-		return p.s[p.posContainerHigh : p.identifiers[len(p.identifiers)-1].Low-1]
+	lowHigh := p.nameLowHigh()
+	return p.s[lowHigh.Low:lowHigh.High]
+}
+
+func (p *Path) nameLowHigh() types.LowHigh[string] {
+	if len(p.identifiersKnown) > 0 {
+		lastID := p.identifiersKnown[len(p.identifiersKnown)-1]
+		if p.posContainerHigh == lastID.Low {
+			// The last identifier is the name.
+			return lastID
+		}
+		return types.LowHigh[string]{
+			Low:  p.posContainerHigh,
+			High: p.identifiersKnown[len(p.identifiersKnown)-1].Low - 1,
+		}
+	}
+	return types.LowHigh[string]{
+		Low:  p.posContainerHigh,
+		High: len(p.s),
 	}
-	return p.s[p.posContainerHigh:]
 }
 
 // Dir returns all but the last element of path, typically the path's directory.
@@ -421,6 +626,11 @@ func (p *Path) Path() (d string) {
 	return p.norm(p.s)
 }
 
+// PathNoLeadingSlash returns the full path without the leading slash.
+func (p *Path) PathNoLeadingSlash() string {
+	return p.Path()[1:]
+}
+
 // Unnormalized returns the Path with the original case preserved.
 func (p *Path) Unnormalized() *Path {
 	return p.unnormalized
@@ -428,6 +638,9 @@ func (p *Path) Unnormalized() *Path {
 
 // PathNoLang returns the Path but with any language identifier removed.
 func (p *Path) PathNoLang() string {
+	if p.identifierIndex(p.posIdentifierLanguage) == -1 {
+		return p.Path()
+	}
 	return p.base(true, false)
 }
 
@@ -436,6 +649,28 @@ func (p *Path) PathNoIdentifier() string {
 	return p.base(false, false)
 }
 
+// PathBeforeLangAndOutputFormatAndExt returns the path up to the first identifier that is not a language or output format.
+func (p *Path) PathBeforeLangAndOutputFormatAndExt() string {
+	if len(p.identifiersKnown) == 0 {
+		return p.norm(p.s)
+	}
+	i := p.identifierIndex(0)
+
+	if j := p.posIdentifierOutputFormat; i == -1 || (j != -1 && j < i) {
+		i = j
+	}
+	if j := p.posIdentifierLanguage; i == -1 || (j != -1 && j < i) {
+		i = j
+	}
+
+	if i == -1 {
+		return p.norm(p.s)
+	}
+
+	id := p.identifiersKnown[i]
+	return p.norm(p.s[:id.Low-1])
+}
+
 // PathRel returns the path relative to the given owner.
 func (p *Path) PathRel(owner *Path) string {
 	ob := owner.Base()
@@ -459,7 +694,27 @@ func (p *Path) BaseRel(owner *Path) string {
 //
 // For other files (Resources), any extension is kept.
 func (p *Path) Base() string {
-	return p.base(!p.isContentPage(), p.IsBundle())
+	s := p.base(!p.isContentPage(), p.IsBundle())
+	if s == "/" && p.isContentPage() {
+		// The content home page is represented as "".
+		s = ""
+	}
+	return s
+}
+
+// Used in template lookups.
+// For pages with Type set, we treat that as the section.
+func (p *Path) BaseReTyped(typ string) (d string) {
+	base := p.Base()
+	if typ == "" || p.Section() == typ {
+		return base
+	}
+	d = "/" + typ
+	if p.posSectionHigh != -1 {
+		d += base[p.posSectionHigh:]
+	}
+	d = p.norm(d)
+	return
 }
 
 // BaseNoLeadingSlash returns the base path without the leading slash.
@@ -468,20 +723,21 @@ func (p *Path) BaseNoLeadingSlash() string {
 }
 
 func (p *Path) base(preserveExt, isBundle bool) string {
-	if len(p.identifiers) == 0 {
+	if len(p.identifiersKnown) == 0 {
 		return p.norm(p.s)
 	}
 
-	if preserveExt && len(p.identifiers) == 1 {
+	if preserveExt && len(p.identifiersKnown) == 1 {
 		// Preserve extension.
 		return p.norm(p.s)
 	}
 
-	id := p.identifiers[len(p.identifiers)-1]
-	high := id.Low - 1
+	var high int
 
 	if isBundle {
 		high = p.posContainerHigh - 1
+	} else {
+		high = p.nameLowHigh().High
 	}
 
 	if high == 0 {
@@ -493,7 +749,7 @@ func (p *Path) base(preserveExt, isBundle bool) string {
 	}
 
 	// For txt files etc. we want to preserve the extension.
-	id = p.identifiers[0]
+	id := p.identifiersKnown[0]
 
 	return p.norm(p.s[:high] + p.s[id.Low-1:id.High])
 }
@@ -502,8 +758,24 @@ func (p *Path) Ext() string {
 	return p.identifierAsString(0)
 }
 
+func (p *Path) OutputFormat() string {
+	return p.identifierAsString(p.posIdentifierOutputFormat)
+}
+
+func (p *Path) Kind() string {
+	return p.identifierAsString(p.posIdentifierKind)
+}
+
+func (p *Path) Layout() string {
+	return p.identifierAsString(p.posIdentifierLayout)
+}
+
 func (p *Path) Lang() string {
-	return p.identifierAsString(1)
+	return p.identifierAsString(p.posIdentifierLanguage)
+}
+
+func (p *Path) Custom() string {
+	return strings.TrimSuffix(strings.TrimPrefix(p.identifierAsString(p.posIdentifierCustom), identifierCurstomWrapper), identifierCurstomWrapper)
 }
 
 func (p *Path) Identifier(i int) string {
@@ -515,35 +787,43 @@ func (p *Path) Disabled() bool {
 }
 
 func (p *Path) Identifiers() []string {
-	ids := make([]string, len(p.identifiers))
-	for i, id := range p.identifiers {
+	ids := make([]string, len(p.identifiersKnown))
+	for i, id := range p.identifiersKnown {
 		ids[i] = p.s[id.Low:id.High]
 	}
 	return ids
 }
 
-func (p *Path) BundleType() PathType {
-	return p.bundleType
+func (p *Path) IdentifiersUnknown() []string {
+	ids := make([]string, len(p.identifiersUnknown))
+	for i, id := range p.identifiersUnknown {
+		ids[i] = p.s[id.Low:id.High]
+	}
+	return ids
+}
+
+func (p *Path) Type() Type {
+	return p.pathType
 }
 
 func (p *Path) IsBundle() bool {
-	return p.bundleType >= PathTypeLeaf
+	return p.pathType >= TypeLeaf && p.pathType <= TypeContentData
 }
 
 func (p *Path) IsBranchBundle() bool {
-	return p.bundleType == PathTypeBranch
+	return p.pathType == TypeBranch
 }
 
 func (p *Path) IsLeafBundle() bool {
-	return p.bundleType == PathTypeLeaf
+	return p.pathType == TypeLeaf
 }
 
 func (p *Path) IsContentData() bool {
-	return p.bundleType == PathTypeContentData
+	return p.pathType == TypeContentData
 }
 
-func (p Path) ForBundleType(t PathType) *Path {
-	p.bundleType = t
+func (p Path) ForType(t Type) *Path {
+	p.pathType = t
 	return &p
 }
 
@@ -553,12 +833,12 @@ func (p *Path) identifierAsString(i int) string {
 		return ""
 	}
 
-	id := p.identifiers[i]
+	id := p.identifiersKnown[i]
 	return p.s[id.Low:id.High]
 }
 
 func (p *Path) identifierIndex(i int) int {
-	if i < 0 || i >= len(p.identifiers) {
+	if i < 0 || i >= len(p.identifiersKnown) {
 		return -1
 	}
 	return i
@@ -576,3 +856,12 @@ func HasExt(p string) bool {
 	}
 	return false
 }
+
+// ValidateIdentifier returns true if the given string is a valid identifier according
+// to Hugo's basic path normalization rules.
+func ValidateIdentifier(s string) error {
+	if s == NormalizePathStringBasic(s) {
+		return nil
+	}
+	return fmt.Errorf("must be all lower case and no spaces")
+}

common/paths/pathparser_test.go

@@ -18,18 +18,33 @@ import (
 	"testing"
 
 	"github.com/gohugoio/hugo/hugofs/files"
+	"github.com/gohugoio/hugo/hugolib/sitesmatrix"
+	"github.com/gohugoio/hugo/resources/kinds"
 
 	qt "github.com/frankban/quicktest"
 )
 
-var testParser = &PathParser{
-	LanguageIndex: map[string]int{
-		"no": 0,
-		"en": 1,
-	},
-	IsContentExt: func(ext string) bool {
-		return ext == "md"
-	},
+func newTestParser() *PathParser {
+	dims := sitesmatrix.NewTestingDimensions([]string{"en", "no", "fr"}, []string{"v1", "v2", "v3"}, []string{"admin", "editor", "viewer", "guest"})
+
+	return &PathParser{
+		LanguageIndex: map[string]int{
+			"no": 0,
+			"en": 1,
+			"fr": 2,
+		},
+		IsContentExt: func(ext string) bool {
+			return ext == "md"
+		},
+		IsOutputFormat: func(name, ext string) bool {
+			switch name {
+			case "html", "amp", "csv", "rss":
+				return true
+			}
+			return false
+		},
+		ConfiguredDimensions: dims,
+	}
 }
 
 func TestParse(t *testing.T) {
@@ -105,17 +120,19 @@ func TestParse(t *testing.T) {
 			"Basic Markdown file",
 			"/a/b/c.md",
 			func(c *qt.C, p *Path) {
+				c.Assert(p.Ext(), qt.Equals, "md")
+				c.Assert(p.Type(), qt.Equals, TypeContentSingle)
 				c.Assert(p.IsContent(), qt.IsTrue)
 				c.Assert(p.IsLeafBundle(), qt.IsFalse)
 				c.Assert(p.Name(), qt.Equals, "c.md")
 				c.Assert(p.Base(), qt.Equals, "/a/b/c")
+				c.Assert(p.BaseReTyped("foo"), qt.Equals, "/foo/b/c")
 				c.Assert(p.Section(), qt.Equals, "a")
 				c.Assert(p.BaseNameNoIdentifier(), qt.Equals, "c")
 				c.Assert(p.Path(), qt.Equals, "/a/b/c.md")
 				c.Assert(p.Dir(), qt.Equals, "/a/b")
 				c.Assert(p.Container(), qt.Equals, "b")
 				c.Assert(p.ContainerDir(), qt.Equals, "/a/b")
-				c.Assert(p.Ext(), qt.Equals, "md")
 			},
 		},
 		{
@@ -130,7 +147,7 @@ func TestParse(t *testing.T) {
 
 				// Reclassify it as a content resource.
 				ModifyPathBundleTypeResource(p)
-				c.Assert(p.BundleType(), qt.Equals, PathTypeContentResource)
+				c.Assert(p.Type(), qt.Equals, TypeContentResource)
 				c.Assert(p.IsContent(), qt.IsTrue)
 				c.Assert(p.Name(), qt.Equals, "b.md")
 				c.Assert(p.Base(), qt.Equals, "/a/b.md")
@@ -163,8 +180,10 @@ func TestParse(t *testing.T) {
 				c.Assert(p.NameNoIdentifier(), qt.Equals, "b.a.b")
 				c.Assert(p.NameNoLang(), qt.Equals, "b.a.b.txt")
 				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"txt", "no"})
+				c.Assert(p.IdentifiersUnknown(), qt.DeepEquals, []string{"b", "a", "b"})
 				c.Assert(p.Base(), qt.Equals, "/a/b.a.b.txt")
 				c.Assert(p.BaseNoLeadingSlash(), qt.Equals, "a/b.a.b.txt")
+				c.Assert(p.Path(), qt.Equals, "/a/b.a.b.no.txt")
 				c.Assert(p.PathNoLang(), qt.Equals, "/a/b.a.b.txt")
 				c.Assert(p.Ext(), qt.Equals, "txt")
 				c.Assert(p.PathNoIdentifier(), qt.Equals, "/a/b.a.b")
@@ -174,7 +193,11 @@ func TestParse(t *testing.T) {
 			"Home branch cundle",
 			"/_index.md",
 			func(c *qt.C, p *Path) {
-				c.Assert(p.Base(), qt.Equals, "/")
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"md"})
+				c.Assert(p.IsBranchBundle(), qt.IsTrue)
+				c.Assert(p.IsBundle(), qt.IsTrue)
+				c.Assert(p.Base(), qt.Equals, "")
+				c.Assert(p.BaseReTyped("foo"), qt.Equals, "/foo")
 				c.Assert(p.Path(), qt.Equals, "/_index.md")
 				c.Assert(p.Container(), qt.Equals, "")
 				c.Assert(p.ContainerDir(), qt.Equals, "/")
@@ -185,12 +208,14 @@ func TestParse(t *testing.T) {
 			"/a/index.md",
 			func(c *qt.C, p *Path) {
 				c.Assert(p.Base(), qt.Equals, "/a")
+				c.Assert(p.BaseReTyped("foo"), qt.Equals, "/foo/a")
 				c.Assert(p.BaseNameNoIdentifier(), qt.Equals, "a")
 				c.Assert(p.Container(), qt.Equals, "a")
 				c.Assert(p.Container(), qt.Equals, "a")
 				c.Assert(p.ContainerDir(), qt.Equals, "")
 				c.Assert(p.Dir(), qt.Equals, "/a")
 				c.Assert(p.Ext(), qt.Equals, "md")
+				c.Assert(p.IdentifiersUnknown(), qt.DeepEquals, []string{"index"})
 				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"md"})
 				c.Assert(p.IsBranchBundle(), qt.IsFalse)
 				c.Assert(p.IsBundle(), qt.IsTrue)
@@ -208,6 +233,7 @@ func TestParse(t *testing.T) {
 			func(c *qt.C, p *Path) {
 				c.Assert(p.Base(), qt.Equals, "/a/b")
 				c.Assert(p.BaseNameNoIdentifier(), qt.Equals, "b")
+				c.Assert(p.BaseReTyped("foo"), qt.Equals, "/foo/b")
 				c.Assert(p.Container(), qt.Equals, "b")
 				c.Assert(p.ContainerDir(), qt.Equals, "/a")
 				c.Assert(p.Dir(), qt.Equals, "/a/b")
@@ -220,6 +246,7 @@ func TestParse(t *testing.T) {
 				c.Assert(p.NameNoExt(), qt.Equals, "index.no")
 				c.Assert(p.NameNoIdentifier(), qt.Equals, "index")
 				c.Assert(p.NameNoLang(), qt.Equals, "index.md")
+				c.Assert(p.Path(), qt.Equals, "/a/b/index.no.md")
 				c.Assert(p.PathNoLang(), qt.Equals, "/a/b/index.md")
 				c.Assert(p.Section(), qt.Equals, "a")
 			},
@@ -245,7 +272,7 @@ func TestParse(t *testing.T) {
 			"Index root no slash",
 			"_index.md",
 			func(c *qt.C, p *Path) {
-				c.Assert(p.Base(), qt.Equals, "/")
+				c.Assert(p.Base(), qt.Equals, "")
 				c.Assert(p.Ext(), qt.Equals, "md")
 				c.Assert(p.Name(), qt.Equals, "_index.md")
 			},
@@ -254,7 +281,7 @@ func TestParse(t *testing.T) {
 			"Index root",
 			"/_index.md",
 			func(c *qt.C, p *Path) {
-				c.Assert(p.Base(), qt.Equals, "/")
+				c.Assert(p.Base(), qt.Equals, "")
 				c.Assert(p.Ext(), qt.Equals, "md")
 				c.Assert(p.Name(), qt.Equals, "_index.md")
 			},
@@ -352,10 +379,249 @@ func TestParse(t *testing.T) {
 				c.Assert(p.IsContentData(), qt.IsFalse)
 			},
 		},
+		{
+			"Custom identifier",
+			"/a/b/p1._myid_.no.md",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Base(), qt.Equals, "/a/b/p1")
+				c.Assert(p.Lang(), qt.Equals, "no")
+				c.Assert(p.Ext(), qt.Equals, "md")
+				c.Assert(p.Custom(), qt.Equals, "myid")
+			},
+		},
 	}
+	parser := newTestParser()
 	for _, test := range tests {
 		c.Run(test.name, func(c *qt.C) {
-			test.assert(c, testParser.Parse(files.ComponentFolderContent, test.path))
+			if test.name != "Caret up identifier" {
+				//	return
+			}
+			test.assert(c, parser.Parse(files.ComponentFolderContent, test.path))
+		})
+	}
+}
+
+func TestParseLayouts(t *testing.T) {
+	c := qt.New(t)
+
+	tests := []struct {
+		name   string
+		path   string
+		assert func(c *qt.C, p *Path)
+	}{
+		{
+			"Basic",
+			"/list.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Base(), qt.Equals, "/list.html")
+				c.Assert(p.OutputFormat(), qt.Equals, "html")
+			},
+		},
+		{
+			"Lang",
+			"/list.no.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "no", "list"})
+				c.Assert(p.IdentifiersUnknown(), qt.DeepEquals, []string{})
+				c.Assert(p.Base(), qt.Equals, "/list.html")
+				c.Assert(p.Lang(), qt.Equals, "no")
+			},
+		},
+		{
+			"Kind",
+			"/section.no.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Kind(), qt.Equals, kinds.KindSection)
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "no", "section"})
+				c.Assert(p.IdentifiersUnknown(), qt.DeepEquals, []string{})
+				c.Assert(p.Base(), qt.Equals, "/section.html")
+				c.Assert(p.Lang(), qt.Equals, "no")
+			},
+		},
+		{
+			"Layout",
+			"/list.section.no.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Layout(), qt.Equals, "list")
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "no", "section", "list"})
+				c.Assert(p.IdentifiersUnknown(), qt.DeepEquals, []string{})
+				c.Assert(p.Base(), qt.Equals, "/list.html")
+				c.Assert(p.Lang(), qt.Equals, "no")
+			},
+		},
+		{
+			"Layout multiple",
+			"/mylayout.list.section.no.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Layout(), qt.Equals, "mylayout")
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "no", "section", "mylayout"})
+				c.Assert(p.IdentifiersUnknown(), qt.DeepEquals, []string{"list"})
+				c.Assert(p.Base(), qt.Equals, "/mylayout.html")
+				c.Assert(p.Lang(), qt.Equals, "no")
+			},
+		},
+		{
+			"Layout shortcode",
+			"/_shortcodes/myshort.list.no.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Layout(), qt.Equals, "list")
+			},
+		},
+		{
+			"Layout baseof",
+			"/baseof.list.no.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Layout(), qt.Equals, "list")
+			},
+		},
+		{
+			"Lang and output format",
+			"/list.no.amp.not.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "list", "amp", "no"})
+				c.Assert(p.IdentifiersUnknown(), qt.DeepEquals, []string{"not"})
+				c.Assert(p.OutputFormat(), qt.Equals, "amp")
+				c.Assert(p.Ext(), qt.Equals, "html")
+				c.Assert(p.Lang(), qt.Equals, "no")
+				c.Assert(p.Base(), qt.Equals, "/list.html")
+			},
+		},
+		{
+			"Term",
+			"/term.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Base(), qt.Equals, "/term.html")
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "term"})
+				c.Assert(p.PathNoIdentifier(), qt.Equals, "/term")
+				c.Assert(p.PathBeforeLangAndOutputFormatAndExt(), qt.Equals, "/term")
+				c.Assert(p.Lang(), qt.Equals, "")
+				c.Assert(p.Kind(), qt.Equals, "term")
+				c.Assert(p.OutputFormat(), qt.Equals, "html")
+			},
+		},
+		{
+			"Shortcode with layout",
+			"/_shortcodes/myshortcode.list.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Base(), qt.Equals, "/_shortcodes/myshortcode.html")
+				c.Assert(p.Type(), qt.Equals, TypeShortcode)
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "list"})
+				c.Assert(p.Layout(), qt.Equals, "list")
+				c.Assert(p.PathNoIdentifier(), qt.Equals, "/_shortcodes/myshortcode")
+				c.Assert(p.PathBeforeLangAndOutputFormatAndExt(), qt.Equals, "/_shortcodes/myshortcode.list")
+				c.Assert(p.Lang(), qt.Equals, "")
+				c.Assert(p.Kind(), qt.Equals, "")
+				c.Assert(p.OutputFormat(), qt.Equals, "html")
+			},
+		},
+		{
+			"Sub dir",
+			"/pages/home.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "home"})
+				c.Assert(p.Lang(), qt.Equals, "")
+				c.Assert(p.Kind(), qt.Equals, "home")
+				c.Assert(p.OutputFormat(), qt.Equals, "html")
+				c.Assert(p.Dir(), qt.Equals, "/pages")
+			},
+		},
+		{
+			"Baseof",
+			"/pages/baseof.list.section.fr.amp.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "amp", "fr", "section", "list", "baseof"})
+				c.Assert(p.IdentifiersUnknown(), qt.DeepEquals, []string{})
+				c.Assert(p.Kind(), qt.Equals, kinds.KindSection)
+				c.Assert(p.Lang(), qt.Equals, "fr")
+				c.Assert(p.OutputFormat(), qt.Equals, "amp")
+				c.Assert(p.Dir(), qt.Equals, "/pages")
+				c.Assert(p.NameNoIdentifier(), qt.Equals, "baseof")
+				c.Assert(p.Type(), qt.Equals, TypeBaseof)
+				c.Assert(p.IdentifierBase(), qt.Equals, "/pages/baseof.list.section.fr.amp.html")
+			},
+		},
+		{
+			"Markup",
+			"/_markup/render-link.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Type(), qt.Equals, TypeMarkup)
+			},
+		},
+		{
+			"Markup nested",
+			"/foo/_markup/render-link.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Type(), qt.Equals, TypeMarkup)
+			},
+		},
+		{
+			"Shortcode",
+			"/_shortcodes/myshortcode.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Type(), qt.Equals, TypeShortcode)
+			},
+		},
+		{
+			"Shortcode nested",
+			"/foo/_shortcodes/myshortcode.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Type(), qt.Equals, TypeShortcode)
+			},
+		},
+		{
+			"Shortcode nested sub",
+			"/foo/_shortcodes/foo/myshortcode.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Type(), qt.Equals, TypeShortcode)
+			},
+		},
+		{
+			"Partials",
+			"/_partials/foo.bar",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Type(), qt.Equals, TypePartial)
+			},
+		},
+		{
+			"Shortcode lang in root",
+			"/_shortcodes/no.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Type(), qt.Equals, TypeShortcode)
+				c.Assert(p.Lang(), qt.Equals, "")
+				c.Assert(p.NameNoIdentifier(), qt.Equals, "no")
+			},
+		},
+		{
+			"Shortcode lang layout",
+			"/_shortcodes/myshortcode.no.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Type(), qt.Equals, TypeShortcode)
+				c.Assert(p.Lang(), qt.Equals, "no")
+				c.Assert(p.Layout(), qt.Equals, "")
+				c.Assert(p.NameNoIdentifier(), qt.Equals, "myshortcode")
+			},
+		},
+		{
+			"Not lang",
+			"/foo/index.xy.html",
+			func(c *qt.C, p *Path) {
+				c.Assert(p.Lang(), qt.Equals, "")
+				c.Assert(p.Layout(), qt.Equals, "index")
+				c.Assert(p.NameNoLang(), qt.Equals, "index.xy.html")
+				c.Assert(p.PathNoLang(), qt.Equals, "/foo/index.xy.html")
+				c.Assert(p.Identifiers(), qt.DeepEquals, []string{"html", "index"})
+				c.Assert(p.IdentifiersUnknown(), qt.DeepEquals, []string{"xy"})
+			},
+		},
+	}
+
+	parser := newTestParser()
+	for _, test := range tests {
+		c.Run(test.name, func(c *qt.C) {
+			if test.name != "Not lang" {
+				return
+			}
+			test.assert(c, parser.Parse(files.ComponentFolderLayouts, test.path))
 		})
 	}
 }
@@ -370,7 +636,27 @@ func TestHasExt(t *testing.T) {
 }
 
 func BenchmarkParseIdentity(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		testParser.ParseIdentity(files.ComponentFolderAssets, "/a/b.css")
+	parser := newTestParser()
+	for b.Loop() {
+		parser.ParseIdentity(files.ComponentFolderAssets, "/a/b.css")
+	}
+}
+
+func TestSitesMatrixFromPath(t *testing.T) {
+	c := qt.New(t)
+
+	parser := newTestParser()
+	p := parser.Parse(files.ComponentFolderContent, "/a/b/c.fr.md")
+	v := parser.SitesMatrixFromPath(p)
+	c.Assert(v.HasLanguage(2), qt.IsTrue)
+	c.Assert(v.LenVectors(), qt.Equals, 1)
+	c.Assert(v.VectorSample(), qt.Equals, sitesmatrix.Vector{2, 0, 0})
+}
+
+func BenchmarkSitesMatrixFromPath(b *testing.B) {
+	parser := newTestParser()
+	p := parser.Parse(files.ComponentFolderContent, "/a/b/c.fr.md")
+	for b.Loop() {
+		parser.SitesMatrixFromPath(p)
 	}
 }

common/paths/paths_integration_test.go

@@ -35,9 +35,9 @@ weight = 2
 removePathAccents = true
 -- content/διακριτικός.md --
 -- content/διακριτικός.fr.md --
--- layouts/_default/single.html --
+-- layouts/single.html --
 {{ .Language.Lang }}|Single.
--- layouts/_default/list.html --
+-- layouts/list.html --
 List
 `
 	b := hugolib.Test(t, files)
@@ -64,9 +64,9 @@ disablePathToLower = true
 -- content/MySection/MyPage.fr.md --
 -- content/MySection/MyBundle/index.md --
 -- content/MySection/MyBundle/index.fr.md --
--- layouts/_default/single.html --
+-- layouts/single.html --
 {{ .Language.Lang }}|Single.
--- layouts/_default/list.html --
+-- layouts/list.html --
 {{ .Language.Lang }}|List.
 `
 	b := hugolib.Test(t, files)
@@ -78,3 +78,26 @@ disablePathToLower = true
 	b.AssertFileContent("public/en/mysection/mybundle/index.html", "en|Single")
 	b.AssertFileContent("public/fr/MySection/MyBundle/index.html", "fr|Single")
 }
+
+func TestIssue13596(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ['home','rss','section','sitemap','taxonomy','term']
+-- content/p1/index.md --
+---
+title: p1
+---
+-- content/p1/a.1.txt --
+-- content/p1/a.2.txt --
+-- layouts/all.html --
+{{ range .Resources.Match "*" }}{{ .Name }}|{{ end }}
+`
+
+	b := hugolib.Test(t, files)
+
+	b.AssertFileContent("public/p1/index.html", "a.1.txt|a.2.txt|")
+	b.AssertFileExists("public/p1/a.1.txt", true)
+	b.AssertFileExists("public/p1/a.2.txt", true) // fails
+}

common/paths/pathtype_string.go

@@ -1,27 +0,0 @@
-// Code generated by "stringer -type=PathType"; DO NOT EDIT.
-
-package paths
-
-import "strconv"
-
-func _() {
-	// An "invalid array index" compiler error signifies that the constant values have changed.
-	// Re-run the stringer command to generate them again.
-	var x [1]struct{}
-	_ = x[PathTypeFile-0]
-	_ = x[PathTypeContentResource-1]
-	_ = x[PathTypeContentSingle-2]
-	_ = x[PathTypeLeaf-3]
-	_ = x[PathTypeBranch-4]
-}
-
-const _PathType_name = "PathTypeFilePathTypeContentResourcePathTypeContentSinglePathTypeLeafPathTypeBranch"
-
-var _PathType_index = [...]uint8{0, 12, 35, 56, 68, 82}
-
-func (i PathType) String() string {
-	if i < 0 || i >= PathType(len(_PathType_index)-1) {
-		return "PathType(" + strconv.FormatInt(int64(i), 10) + ")"
-	}
-	return _PathType_name[_PathType_index[i]:_PathType_index[i+1]]
-}