Fix material icon & diff highlight (#33844)

modules/fileicon/material.go

@@ -18,13 +18,9 @@ import (
 )
 
 type materialIconRulesData struct {
-	IconDefinitions map[string]*struct {
-		IconPath string `json:"iconPath"`
-	} `json:"iconDefinitions"`
 	FileNames      map[string]string `json:"fileNames"`
 	FolderNames    map[string]string `json:"folderNames"`
 	FileExtensions map[string]string `json:"fileExtensions"`
-	LanguageIDs    map[string]string `json:"languageIds"`
 }
 
 type MaterialIconProvider struct {
@@ -36,6 +32,7 @@ type MaterialIconProvider struct {
 var materialIconProvider MaterialIconProvider
 
 func DefaultMaterialIconProvider() *MaterialIconProvider {
+	materialIconProvider.once.Do(materialIconProvider.loadData)
 	return &materialIconProvider
 }
 
@@ -88,8 +85,6 @@ func (m *MaterialIconProvider) renderFileIconSVG(ctx reqctx.RequestContext, name
 }
 
 func (m *MaterialIconProvider) FileIcon(ctx reqctx.RequestContext, entry *git.TreeEntry) template.HTML {
-	m.once.Do(m.loadData)
-
 	if m.rules == nil {
 		return BasicThemeIcon(entry)
 	}
@@ -101,7 +96,7 @@ func (m *MaterialIconProvider) FileIcon(ctx reqctx.RequestContext, entry *git.Tr
 		return svg.RenderHTML("octicon-file-symlink-file") // TODO: find some better icons for them
 	}
 
-	name := m.findIconName(entry)
+	name := m.findIconNameByGit(entry)
 	if name == "folder" {
 		// the material icon pack's "folder" icon doesn't look good, so use our built-in one
 		return svg.RenderHTML("material-folder-generic")
@@ -112,34 +107,23 @@ func (m *MaterialIconProvider) FileIcon(ctx reqctx.RequestContext, entry *git.Tr
 	return svg.RenderHTML("octicon-file")
 }
 
-func (m *MaterialIconProvider) findIconName(entry *git.TreeEntry) string {
+func (m *MaterialIconProvider) FindIconName(name string, isDir bool) string {
-	if entry.IsSubModule() {
-		return "folder-git"
-	}
-
 	iconsData := m.rules
-	fileName := path.Base(entry.Name())
+	fileNameLower := strings.ToLower(path.Base(name))
-
+	if isDir {
-	if entry.IsDir() {
+		if s, ok := iconsData.FolderNames[fileNameLower]; ok {
-		if s, ok := iconsData.FolderNames[fileName]; ok {
-			return s
-		}
-		if s, ok := iconsData.FolderNames[strings.ToLower(fileName)]; ok {
 			return s
 		}
 		return "folder"
 	}
 
-	if s, ok := iconsData.FileNames[fileName]; ok {
+	if s, ok := iconsData.FileNames[fileNameLower]; ok {
-		return s
-	}
-	if s, ok := iconsData.FileNames[strings.ToLower(fileName)]; ok {
 		return s
 	}
 
-	for i := len(fileName) - 1; i >= 0; i-- {
+	for i := len(fileNameLower) - 1; i >= 0; i-- {
-		if fileName[i] == '.' {
+		if fileNameLower[i] == '.' {
-			ext := fileName[i+1:]
+			ext := fileNameLower[i+1:]
 			if s, ok := iconsData.FileExtensions[ext]; ok {
 				return s
 			}
@@ -148,3 +132,10 @@ func (m *MaterialIconProvider) findIconName(entry *git.TreeEntry) string {
 
 	return "file"
 }
+
+func (m *MaterialIconProvider) findIconNameByGit(entry *git.TreeEntry) string {
+	if entry.IsSubModule() {
+		return "folder-git"
+	}
+	return m.FindIconName(entry.Name(), entry.IsDir())
+}

modules/fileicon/material_test.go

@@ -0,0 +1,24 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package fileicon_test
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/fileicon"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m, &unittest.TestOptions{FixtureFiles: []string{}})
+}
+
+func TestFindIconName(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+	p := fileicon.DefaultMaterialIconProvider()
+	assert.Equal(t, "php", p.FindIconName("foo.php", false))
+	assert.Equal(t, "php", p.FindIconName("foo.PHP", false))
+}

modules/git/commit_info_nogogit.go

@@ -65,7 +65,7 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 			log.Debug("missing commit for %s", entry.Name())
 		}
 
-		// If the entry if a submodule add a submodule file for this
+		// If the entry is a submodule add a submodule file for this
 		if entry.IsSubModule() {
 			subModuleURL := ""
 			var fullPath string
@@ -85,8 +85,8 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 	}
 
 	// Retrieve the commit for the treePath itself (see above). We basically
-	// get it for free during the tree traversal and it's used for listing
+	// get it for free during the tree traversal, and it's used for listing
-	// pages to display information about newest commit for a given path.
+	// pages to display information about the newest commit for a given path.
 	var treeCommit *Commit
 	var ok bool
 	if treePath == "" {

routers/web/repo/compare.go

@@ -900,7 +900,6 @@ func ExcerptBlob(ctx *context.Context) {
 	}
 	section := &gitdiff.DiffSection{
 		FileName: filePath,
-		Name:     filePath,
 	}
 	if direction == "up" && (idxLeft-lastLeft) > chunkSize {
 		idxLeft -= chunkSize

services/gitdiff/gitdiff.go

@@ -78,7 +78,7 @@ const (
 type DiffLine struct {
 	LeftIdx     int // line number, 1-based
 	RightIdx    int // line number, 1-based
-	Match       int // line number, 1-based
+	Match       int // the diff matched index. -1: no match. 0: plain and no need to match. >0: for add/del, "Lines" slice index of the other side
 	Type        DiffLineType
 	Content     string
 	Comments    issues_model.CommentList // related PR code comments
@@ -203,12 +203,20 @@ func getLineContent(content string, locale translation.Locale) DiffInline {
 type DiffSection struct {
 	file     *DiffFile
 	FileName string
-	Name     string
 	Lines    []*DiffLine
 }
 
+func (diffSection *DiffSection) GetLine(idx int) *DiffLine {
+	if idx <= 0 {
+		return nil
+	}
+	return diffSection.Lines[idx]
+}
+
 // GetLine gets a specific line by type (add or del) and file line number
-func (diffSection *DiffSection) GetLine(lineType DiffLineType, idx int) *DiffLine {
+// This algorithm is not quite right.
+// Actually now we have "Match" field, it is always right, so use it instead in new GetLine
+func (diffSection *DiffSection) getLineLegacy(lineType DiffLineType, idx int) *DiffLine { //nolint:unused
 	var (
 		difference    = 0
 		addCount      = 0
@@ -279,7 +287,7 @@ func (diffSection *DiffSection) getLineContentForRender(lineIdx int, diffLine *D
 	if setting.Git.DisableDiffHighlight {
 		return template.HTML(html.EscapeString(diffLine.Content[1:]))
 	}
-	h, _ = highlight.Code(diffSection.Name, fileLanguage, diffLine.Content[1:])
+	h, _ = highlight.Code(diffSection.FileName, fileLanguage, diffLine.Content[1:])
 	return h
 }
 
@@ -292,20 +300,31 @@ func (diffSection *DiffSection) getDiffLineForRender(diffLineType DiffLineType,
 		highlightedLeftLines, highlightedRightLines = diffSection.file.highlightedLeftLines, diffSection.file.highlightedRightLines
 	}
 
+	var lineHTML template.HTML
 	hcd := newHighlightCodeDiff()
-	var diff1, diff2, lineHTML template.HTML
+	if diffLineType == DiffLinePlain {
-	if leftLine != nil {
+		// left and right are the same, no need to do line-level diff
-		diff1 = diffSection.getLineContentForRender(leftLine.LeftIdx, leftLine, fileLanguage, highlightedLeftLines)
+		if leftLine != nil {
-		lineHTML = util.Iif(diffLineType == DiffLinePlain, diff1, "")
+			lineHTML = diffSection.getLineContentForRender(leftLine.LeftIdx, leftLine, fileLanguage, highlightedLeftLines)
-	}
+		} else if rightLine != nil {
-	if rightLine != nil {
+			lineHTML = diffSection.getLineContentForRender(rightLine.RightIdx, rightLine, fileLanguage, highlightedRightLines)
-		diff2 = diffSection.getLineContentForRender(rightLine.RightIdx, rightLine, fileLanguage, highlightedRightLines)
+		}
-		lineHTML = util.Iif(diffLineType == DiffLinePlain, diff2, "")
+	} else {
-	}
+		var diff1, diff2 template.HTML
-	if diffLineType != DiffLinePlain {
+		if leftLine != nil {
-		// it seems that Gitea doesn't need the line wrapper of Chroma, so do not add them back
+			diff1 = diffSection.getLineContentForRender(leftLine.LeftIdx, leftLine, fileLanguage, highlightedLeftLines)
-		// if the line wrappers are still needed in the future, it can be added back by "diffLineWithHighlightWrapper(hcd.lineWrapperTags. ...)"
+		}
-		lineHTML = hcd.diffLineWithHighlight(diffLineType, diff1, diff2)
+		if rightLine != nil {
+			diff2 = diffSection.getLineContentForRender(rightLine.RightIdx, rightLine, fileLanguage, highlightedRightLines)
+		}
+		if diff1 != "" && diff2 != "" {
+			// if only some parts of a line are changed, highlight these changed parts as "deleted/added".
+			lineHTML = hcd.diffLineWithHighlight(diffLineType, diff1, diff2)
+		} else {
+			// if left is empty or right is empty (a line is fully deleted or added), then we do not need to diff anymore.
+			// the tmpl code already adds background colors for these cases.
+			lineHTML = util.Iif(diffLineType == DiffLineDel, diff1, diff2)
+		}
 	}
 	return DiffInlineWithUnicodeEscape(lineHTML, locale)
 }
@@ -317,10 +336,10 @@ func (diffSection *DiffSection) GetComputedInlineDiffFor(diffLine *DiffLine, loc
 	case DiffLineSection:
 		return getLineContent(diffLine.Content[1:], locale)
 	case DiffLineAdd:
-		compareDiffLine := diffSection.GetLine(DiffLineDel, diffLine.RightIdx)
+		compareDiffLine := diffSection.GetLine(diffLine.Match)
 		return diffSection.getDiffLineForRender(DiffLineAdd, compareDiffLine, diffLine, locale)
 	case DiffLineDel:
-		compareDiffLine := diffSection.GetLine(DiffLineAdd, diffLine.LeftIdx)
+		compareDiffLine := diffSection.GetLine(diffLine.Match)
 		return diffSection.getDiffLineForRender(DiffLineDel, diffLine, compareDiffLine, locale)
 	default: // Plain
 		// TODO: there was an "if" check: `if diffLine.Content >strings.IndexByte(" +-", diffLine.Content[0]) > -1 { ... } else { ... }`
@@ -383,15 +402,22 @@ type DiffLimitedContent struct {
 
 // GetTailSectionAndLimitedContent creates a fake DiffLineSection if the last section is not the end of the file
 func (diffFile *DiffFile) GetTailSectionAndLimitedContent(leftCommit, rightCommit *git.Commit) (_ *DiffSection, diffLimitedContent DiffLimitedContent) {
-	if len(diffFile.Sections) == 0 || leftCommit == nil || diffFile.Type != DiffFileChange || diffFile.IsBin || diffFile.IsLFSFile {
+	var leftLineCount, rightLineCount int
+	diffLimitedContent = DiffLimitedContent{}
+	if diffFile.IsBin || diffFile.IsLFSFile {
+		return nil, diffLimitedContent
+	}
+	if (diffFile.Type == DiffFileDel || diffFile.Type == DiffFileChange) && leftCommit != nil {
+		leftLineCount, diffLimitedContent.LeftContent = getCommitFileLineCountAndLimitedContent(leftCommit, diffFile.OldName)
+	}
+	if (diffFile.Type == DiffFileAdd || diffFile.Type == DiffFileChange) && rightCommit != nil {
+		rightLineCount, diffLimitedContent.RightContent = getCommitFileLineCountAndLimitedContent(rightCommit, diffFile.OldName)
+	}
+	if len(diffFile.Sections) == 0 || diffFile.Type != DiffFileChange {
 		return nil, diffLimitedContent
 	}
-
 	lastSection := diffFile.Sections[len(diffFile.Sections)-1]
 	lastLine := lastSection.Lines[len(lastSection.Lines)-1]
-	leftLineCount, leftContent := getCommitFileLineCountAndLimitedContent(leftCommit, diffFile.Name)
-	rightLineCount, rightContent := getCommitFileLineCountAndLimitedContent(rightCommit, diffFile.Name)
-	diffLimitedContent = DiffLimitedContent{LeftContent: leftContent, RightContent: rightContent}
 	if leftLineCount <= lastLine.LeftIdx || rightLineCount <= lastLine.RightIdx {
 		return nil, diffLimitedContent
 	}

services/gitdiff/highlightdiff.go

@@ -99,7 +99,7 @@ func (hcd *highlightCodeDiff) diffLineWithHighlightWrapper(lineWrapperTags []str
 
 	dmp := defaultDiffMatchPatch()
 	diffs := dmp.DiffMain(convertedCodeA, convertedCodeB, true)
-	diffs = dmp.DiffCleanupEfficiency(diffs)
+	diffs = dmp.DiffCleanupSemantic(diffs)
 
 	buf := bytes.NewBuffer(nil)
 

services/gitdiff/highlightdiff_test.go

@@ -23,6 +23,16 @@ func TestDiffWithHighlight(t *testing.T) {
 		assert.Equal(t, `x <span class="k"><span class="added-code">bar</span></span> y`, string(outAdd))
 	})
 
+	t.Run("CleanUp", func(t *testing.T) {
+		hcd := newHighlightCodeDiff()
+		codeA := template.HTML(`<span class="cm>this is a comment</span>`)
+		codeB := template.HTML(`<span class="cm>this is updated comment</span>`)
+		outDel := hcd.diffLineWithHighlight(DiffLineDel, codeA, codeB)
+		assert.Equal(t, `<span class="cm>this is <span class="removed-code">a</span> comment</span>`, string(outDel))
+		outAdd := hcd.diffLineWithHighlight(DiffLineAdd, codeA, codeB)
+		assert.Equal(t, `<span class="cm>this is <span class="added-code">updated</span> comment</span>`, string(outAdd))
+	})
+
 	t.Run("OpenCloseTags", func(t *testing.T) {
 		hcd := newHighlightCodeDiff()
 		hcd.placeholderTokenMap['O'], hcd.placeholderTokenMap['C'] = "<span>", "</span>"

services/repository/files/diff_test.go

@@ -47,7 +47,6 @@ func TestGetDiffPreview(t *testing.T) {
 				Sections: []*gitdiff.DiffSection{
 					{
 						FileName: "README.md",
-						Name:     "",
 						Lines: []*gitdiff.DiffLine{
 							{
 								LeftIdx:  0,

tools/generate-svg.js

@@ -63,8 +63,18 @@ async function processMaterialFileIcons() {
   }
   fs.writeFileSync(fileURLToPath(new URL(`../options/fileicon/material-icon-svgs.json`, import.meta.url)), JSON.stringify(svgSymbols, null, 2));
 
-  const iconRules = await readFile(fileURLToPath(new URL(`../node_modules/material-icon-theme/dist/material-icons.json`, import.meta.url)));
+  const iconRulesJson = await readFile(fileURLToPath(new URL(`../node_modules/material-icon-theme/dist/material-icons.json`, import.meta.url)));
-  const iconRulesPretty = JSON.stringify(JSON.parse(iconRules), null, 2);
+  const iconRules = JSON.parse(iconRulesJson);
+  // The rules are from VSCode material-icon-theme, we need to adjust them to our needs
+  // 1. We only use lowercase filenames to match (it should be good enough for most cases and more efficient)
+  // 2. We do not have a "Language ID" system: https://code.visualstudio.com/docs/languages/identifiers#_known-language-identifiers
+  //    * So we just treat the "Language ID" as file extension, it is not always true, but it is good enough for most cases.
+  delete iconRules.iconDefinitions;
+  for (const [k, v] of Object.entries(iconRules.fileNames)) iconRules.fileNames[k.toLowerCase()] = v;
+  for (const [k, v] of Object.entries(iconRules.folderNames)) iconRules.folderNames[k.toLowerCase()] = v;
+  for (const [k, v] of Object.entries(iconRules.fileExtensions)) iconRules.fileExtensions[k.toLowerCase()] = v;
+  for (const [k, v] of Object.entries(iconRules.languageIds)) iconRules.fileExtensions[k.toLowerCase()] = v;
+  const iconRulesPretty = JSON.stringify(iconRules, null, 2);
   fs.writeFileSync(fileURLToPath(new URL(`../options/fileicon/material-icon-rules.json`, import.meta.url)), iconRulesPretty);
 }