Support PostProcess for all file types

Not just HTML.

Fixes #10269

hugolib/hugo_sites_build.go

@@ -18,7 +18,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"os"
 	"path/filepath"
 	"runtime/trace"
 	"strings"
@@ -439,23 +438,15 @@ func (h *HugoSites) postProcess() error {
 		return nil
 	}
 
-	_ = afero.Walk(h.BaseFs.PublishFs, "", func(path string, info os.FileInfo, err error) error {
-		if info == nil || info.IsDir() {
-			return nil
-		}
-
-		if !strings.HasSuffix(path, "html") {
-			return nil
-		}
-
+	for _, filename := range h.Deps.FilenameHasPostProcessPrefix {
+		filename := filename
 		g.Run(func() error {
-			return handleFile(path)
+			return handleFile(filename)
 		})
-
-		return nil
-	})
+	}
 
 	// Prepare for a new build.
+	h.Deps.FilenameHasPostProcessPrefix = nil
 	for _, s := range h.Sites {
 		s.ResourceSpec.PostProcessResources = make(map[string]postpub.PostPublishedResource)
 	}

hugolib/resource_chain_test.go

@@ -168,6 +168,11 @@ HELLO: {{ $hello.RelPermalink }}
 HELLO: {{ $hello.RelPermalink }}|Integrity: {{ $hello.Data.Integrity }}|MediaType: {{ $hello.MediaType.Type }}
 HELLO2: Name: {{ $hello.Name }}|Content: {{ $hello.Content }}|Title: {{ $hello.Title }}|ResourceType: {{ $hello.ResourceType }}
 
+// Issue #10269
+{{ $m := dict "relPermalink"  $hello.RelPermalink "integrity" $hello.Data.Integrity "mediaType" $hello.MediaType.Type }}
+{{ $json := jsonify (dict "indent" "  ") $m | resources.FromString "hello.json" -}}
+JSON: {{ $json.RelPermalink }}
+
 // Issue #8884
 <a href="hugo.rocks">foo</a>
 <a href="{{ $hello.RelPermalink }}" integrity="{{ $hello.Data.Integrity}}">Hello</a>
@@ -188,6 +193,11 @@ End.`)
 
 	b.AssertFileContent("public/page1/index.html", `HELLO: /hello.min.a2d1cb24f24b322a7dad520414c523e9.html`)
 	b.AssertFileContent("public/page2/index.html", `HELLO: /hello.min.a2d1cb24f24b322a7dad520414c523e9.html`)
+	b.AssertFileContent("public/hello.json", `
+integrity": "md5-otHLJPJLMip9rVIEFMUj6Q==
+mediaType": "text/html
+relPermalink": "/hello.min.a2d1cb24f24b322a7dad520414c523e9.html"
+`)
 }
 
 func BenchmarkResourceChainPostProcess(b *testing.B) {

hugolib/testhelpers_test.go

@@ -764,8 +764,12 @@ func (s *sitesBuilder) AssertImage(width, height int, filename string) {
 
 func (s *sitesBuilder) AssertNoDuplicateWrites() {
 	s.Helper()
-	d := s.Fs.PublishDir.(hugofs.DuplicatesReporter)
-	s.Assert(d.ReportDuplicates(), qt.Equals, "")
+	hugofs.WalkFilesystems(s.Fs.PublishDir, func(fs afero.Fs) bool {
+		if dfs, ok := fs.(hugofs.DuplicatesReporter); ok {
+			s.Assert(dfs.ReportDuplicates(), qt.Equals, "")
+		}
+		return false
+	})
 }
 
 func (s *sitesBuilder) FileContent(filename string) string {