Fix multi --renderSegments merge behavior

Fixes #15024

hugolib/integrationtest_builder.go

@@ -559,7 +559,12 @@ func (s *IntegrationTestBuilder) AssertPublishDir(matches ...string) {
 func (s *IntegrationTestBuilder) AssertFs(fs afero.Fs, matches ...string) {
 	s.Helper()
 	var buff bytes.Buffer
-	s.Assert(s.printAndCheckFs(fs, "", &buff), qt.IsNil)
+	if err := s.printAndCheckFs(fs, "", &buff); err != nil {
+		// E.g. public not created, treat that as an empty dir.
+		if !errors.Is(err, os.ErrNotExist) {
+			s.Fatal(err)
+		}
+	}
 	printFsLines := strings.Split(buff.String(), "\n")
 	sort.Strings(printFsLines)
 	content := strings.TrimSpace((strings.Join(printFsLines, "\n")))
@@ -589,7 +594,7 @@ func (s *IntegrationTestBuilder) printAndCheckFs(fs afero.Fs, path string, w io.
 
 	return afero.Walk(fs, path, func(path string, info os.FileInfo, err error) error {
 		if err != nil {
-			return fmt.Errorf("error: path %q: %s", path, err)
+			return err
 		}
 		path = filepath.ToSlash(path)
 		if path == "" {

hugolib/segments/segments.go

@@ -44,17 +44,35 @@ type SegmentFilter interface {
 	ShouldExcludeFine(SegmentQuery) bool
 }
 
-type segmentFilter struct {
-	exclude predicate.PR[SegmentQuery]
+type segmentPredicate struct {
 	include predicate.PR[SegmentQuery]
+	exclude predicate.PR[SegmentQuery]
 }
 
+type segmentFilter struct {
+	segments []segmentPredicate
+}
+
+// ShouldExcludeCoarse skips a whole site or output format only if every
+// segment excludes it; a single segment that doesn't is enough to keep it.
 func (f segmentFilter) ShouldExcludeCoarse(q SegmentQuery) bool {
-	return f.exclude(q).OK()
+	for _, s := range f.segments {
+		if !s.exclude(q).OK() {
+			return false
+		}
+	}
+	return true
 }
 
+// ShouldExcludeFine renders the query if any segment includes it and does not
+// exclude it.
 func (f segmentFilter) ShouldExcludeFine(q SegmentQuery) bool {
-	return f.exclude(q).OK() || !f.include(q).OK()
+	for _, s := range f.segments {
+		if s.include(q).OK() && !s.exclude(q).OK() {
+			return false
+		}
+	}
+	return true
 }
 
 type segmentsBuilder struct {
@@ -204,23 +222,17 @@ func (s *segmentsBuilder) build() (SegmentFilter, error) {
 		if err != nil {
 			return nil, err
 		}
-		if sf.include == nil {
-			sf.include = include
-		} else {
-			sf.include = sf.include.Or(include)
+		if include == nil {
+			include = matchAll
 		}
-		if sf.exclude == nil {
-			sf.exclude = exclude
-		} else {
-			sf.exclude = sf.exclude.Or(exclude)
+		if exclude == nil {
+			exclude = matchNothing
 		}
+		sf.segments = append(sf.segments, segmentPredicate{include: include, exclude: exclude})
 	}
 
-	if sf.exclude == nil {
-		sf.exclude = matchNothing
-	}
-	if sf.include == nil {
-		sf.include = matchAll
+	if len(sf.segments) == 0 {
+		sf.segments = append(sf.segments, segmentPredicate{include: matchAll, exclude: matchNothing})
 	}
 
 	return sf, nil

hugolib/segments/segments_integration_test.go

@@ -14,6 +14,7 @@
 package segments_test
 
 import (
+	"strings"
 	"testing"
 
 	qt "github.com/frankban/quicktest"
@@ -76,6 +77,64 @@ tags: ["tag1", "tag2"]
 	b.AssertFileExists("public/no/index.xml", false)
 }
 
+// See issue 15024.
+func TestSegmentsMultiple(t *testing.T) {
+	filesTemplate := `
+-- hugo.toml --
+renderSegments = SEGMENTS
+disableKinds = ["home", "taxonomy", "term", "page"]
+[outputs]
+section = ['html', 'json']
+[segments]
+[segments.excludeallkinds]
+[[segments.excludeallkinds.excludes]]
+kind = "**"
+[segments.blog]
+[[segments.blog.includes]]
+path = "{/blog,/blog/**}"
+[[segments.blog.excludes]]
+output = 'json'
+[segments.news]
+[[segments.news.includes]]
+path = "{/news,/news/**}"
+-- layouts/all.html --
+{{ .Kind }}: {{ .Title }}|{{ .RelPermalink }}|
+-- layouts/all.json --
+{{ .Kind }}: {{ .Title }}|{{ .RelPermalink }}|
+-- content/blog/_index.md --
+-- content/blog/page1.md --
+---
+title: "Blog Page 1"
+tags: ["tag1", "tag2"]
+---
+-- content/news/_index.md --
+-- content/news/page1.md --
+---
+title: "News Page 1"
+tags: ["tag1", "tag2"]
+---
+`
+	files := strings.ReplaceAll(filesTemplate, "SEGMENTS", `["excludeallkinds", "blog", "news"]`)
+
+	b := hugolib.Test(t, files, hugolib.TestOptInfo())
+
+	b.AssertPublishDir(`
+blog/index.html
+! blog/index.json
+news/index.html
+news/index.json
+`)
+
+	files = strings.ReplaceAll(filesTemplate, "SEGMENTS", `["excludeallkinds"]`)
+
+	b = hugolib.Test(t, files, hugolib.TestOptInfo())
+
+	b.AssertPublishDir(`
+! json
+! html
+`)
+}
+
 // See issue 14939.
 func TestRenderSegmentsMergesHugoStatsJSON(t *testing.T) {
 	files := `