Improve implementation of diff-file-tree

services/gitdiff/gitdiff.go

@@ -448,12 +448,20 @@ func getCommitFileLineCount(commit *git.Commit, filePath string) int {
 	return lineCount
 }
 
+type FileTreeNode struct {
+	IsFile   bool
+	Name     string
+	File     *DiffFile
+	Children []*FileTreeNode
+}
+
 // Diff represents a difference between two git trees.
 type Diff struct {
 	Start, End                   string
 	NumFiles                     int
 	TotalAddition, TotalDeletion int
 	Files                        []*DiffFile
+	FileTree                     []*FileTreeNode
 	IsIncomplete                 bool
 	NumViewedFiles               int // user-specific
 }
@@ -1212,6 +1220,8 @@ func GetDiff(ctx context.Context, gitRepo *git.Repository, opts *DiffOptions, fi
 		}
 	}
 
+	diff.FileTree = buildTree(diff.Files)
+
 	if opts.FileOnly {
 		return diff, nil
 	}
@@ -1384,3 +1394,65 @@ func GetWhitespaceFlag(whitespaceBehavior string) git.TrustedCmdArgs {
 	log.Warn("unknown whitespace behavior: %q, default to 'show-all'", whitespaceBehavior)
 	return nil
 }
+
+func buildTree(files []*DiffFile) []*FileTreeNode {
+	result := make(map[string]*FileTreeNode)
+	for _, file := range files {
+		splits := strings.Split(file.Name, "/")
+		currentNode := &FileTreeNode{Name: splits[0], IsFile: false}
+		if _, exists := result[splits[0]]; !exists {
+			result[splits[0]] = currentNode
+		} else {
+			currentNode = result[splits[0]]
+		}
+
+		parent := currentNode
+		for _, split := range splits[1:] {
+			found := false
+			for _, child := range parent.Children {
+				if child.Name == split {
+					parent = child
+					found = true
+					break
+				}
+			}
+			if !found {
+				newNode := &FileTreeNode{Name: split, IsFile: false}
+				parent.Children = append(parent.Children, newNode)
+				parent = newNode
+			}
+		}
+
+		lastNode := parent
+		lastNode.IsFile = true
+		lastNode.File = file
+	}
+
+	var roots []*FileTreeNode
+	for _, node := range result {
+		if len(node.Children) > 0 {
+			mergedNode := mergeSingleChildDirs(node)
+			roots = append(roots, mergedNode)
+		}
+	}
+	return roots
+}
+
+func mergeSingleChildDirs(node *FileTreeNode) *FileTreeNode {
+	if len(node.Children) == 1 && !node.Children[0].IsFile {
+		merged := &FileTreeNode{
+			Name:     fmt.Sprintf("%s/%s", node.Name, node.Children[0].Name),
+			Children: node.Children[0].Children,
+			IsFile:   node.Children[0].IsFile,
+			File:     node.Children[0].File,
+		}
+		if merged.File != nil {
+			merged.IsFile = true
+		}
+		return merged
+	}
+	for _, child := range node.Children {
+		mergeSingleChildDirs(child)
+	}
+	return node
+}

templates/repo/diff/box.tmpl

@@ -61,35 +61,29 @@
 			</div>
 		{{end}}
 		<script id="diff-data-script" type="module">
-			const diffDataFiles = [{{range $i, $file := .Diff.Files}}{Name:"{{$file.Name}}",NameHash:"{{$file.NameHash}}",Type:{{$file.Type}},IsBin:{{$file.IsBin}},Addition:{{$file.Addition}},Deletion:{{$file.Deletion}},IsViewed:{{$file.IsViewed}}},{{end}}];
 			const diffData = {
-				isIncomplete: {{.Diff.IsIncomplete}},
 				tooManyFilesMessage: "{{ctx.Locale.Tr "repo.diff.too_many_files"}}",
 				binaryFileMessage: "{{ctx.Locale.Tr "repo.diff.bin"}}",
-				showMoreMessage: "{{ctx.Locale.Tr "repo.diff.show_more"}}",
 				statisticsMessage: "{{ctx.Locale.Tr "repo.diff.stats_desc_file"}}",
-				linkLoadMore: "?skip-to={{.Diff.End}}&file-only=true",
 			};
 
 			// for first time loading, the diffFileInfo is a plain object
 			// after the Vue component is mounted, the diffFileInfo is a reactive object
 			// keep in mind that this script block would be executed many times when loading more files, by "loadMoreFiles"
 			let diffFileInfo = window.config.pageData.diffFileInfo || {
-				files:[],
 				fileTreeIsVisible: false,
 				fileListIsVisible: false,
 				isLoadingNewData: false,
 				selectedItem: '',
 			};
 			diffFileInfo = Object.assign(diffFileInfo, diffData);
-			diffFileInfo.files.push(...diffDataFiles);
 			window.config.pageData.diffFileInfo = diffFileInfo;
 		</script>
 		<div id="diff-file-list"></div>
 	{{end}}
 	<div id="diff-container">
 		{{if $showFileTree}}
-			<div id="diff-file-tree" class="tw-hidden not-mobile"></div>
+			{{template "repo/diff/file_tree" dict "Files" .Diff.FileTree "IsIncomplete" .Diff.IsIncomplete "LoadMoreLink" "?skip-to={{.Diff.End}}&file-only=true"}}
 			<script>
 				if (diffTreeVisible) document.getElementById('diff-file-tree').classList.remove('tw-hidden');
 			</script>
@@ -228,7 +222,7 @@
 					<div class="diff-file-box diff-box file-content tw-mt-2" id="diff-incomplete">
 						<h4 class="ui top attached header tw-font-normal tw-flex tw-items-center tw-justify-between">
 							{{ctx.Locale.Tr "repo.diff.too_many_files"}}
-							<a class="ui basic tiny button" id="diff-show-more-files" data-href="?skip-to={{.Diff.End}}&file-only=true">{{ctx.Locale.Tr "repo.diff.show_more"}}</a>
+							<a class="ui basic tiny button diff-show-more-files" data-href="?skip-to={{.Diff.End}}&file-only=true">{{ctx.Locale.Tr "repo.diff.show_more"}}</a>
 						</h4>
 					</div>
 				{{end}}

templates/repo/diff/file_tree.tmpl

@@ -0,0 +1,12 @@
+<div id="diff-file-tree" class="file-tree tw-hidden not-mobile">
+	<div class="file-tree-items">
+		{{range .Files}}
+    	{{template "repo/diff/file_tree_item" .}}
+		{{end}}
+  </div>
+	{{if .IsIncomplete}}
+		<div class="tw-pt-1">
+			<a class="ui basic tiny button diff-show-more-files" data-href="{{ .LoadMoreLink }}">{{ctx.Locale.Tr "repo.diff.show_more"}}</a>
+		</div>
+	{{end}}
+</div>

templates/repo/diff/file_tree_item.tmpl

@@ -0,0 +1,32 @@
+{{if .IsFile}}
+	<a class="item-file {{if .File.IsViewed}} viewed {{end}}" title="{{ .Name }}" href="#diff-{{ .File.NameHash }}">
+		<!-- file -->
+		{{svg "octicon-file"}}
+		<span class="gt-ellipsis tw-flex-1">{{ .Name }}</span>
+		{{if eq .File.Type 1}}
+			{{svg "octicon-diff-added" 16 "text green"}}
+		{{else if eq .File.Type 2}}
+			{{svg "octicon-diff-modified" 16 "text yellow"}}
+		{{else if eq .File.Type 3}}
+			{{svg "octicon-diff-removed" 16 "text red"}}
+		{{else if eq .File.Type 4}}
+			{{svg "octicon-diff-renamed" 16 "text teal"}}
+		{{else if eq .File.Type 5}}
+			{{svg "octicon-diff-renamed" 16 "text green"}}
+		{{end}}
+	</a>
+{{else}}
+	<div class="item-directory" title="{{ .Name }}">
+    <!-- directory -->
+		{{svg "octicon-chevron-down"}}
+		{{svg "octicon-file-directory-open-fill" 16 "text primary"}}
+    <span class="gt-ellipsis">{{ .Name }}</span>
+  </div>
+{{end}}
+{{if and .Children (gt (len .Children) 0)}}
+	<div class="sub-items">
+		{{range .Children}}
+    	{{template "repo/diff/file_tree_item" .}}
+		{{end}}
+	</div>
+{{end}}

web_src/css/repo.css

@@ -2377,7 +2377,7 @@ tbody.commit-list {
   gap: 8px;
 }
 
-#diff-file-tree {
+.file-tree {
   flex: 0 0 20%;
   max-width: 380px;
   line-height: inherit;
@@ -2389,6 +2389,60 @@ tbody.commit-list {
   overflow-y: auto;
 }
 
+.file-tree .file-tree-items {
+  display: flex;
+  flex-direction: column;
+  gap: 1px;
+  margin-right: .5rem;
+}
+
+.file-tree .file-tree-items a, a:hover {
+  text-decoration: none;
+  color: var(--color-text);
+}
+
+.file-tree .file-tree-items .sub-items {
+  display: flex;
+  flex-direction: column;
+  gap: 1px;
+  margin-left: 13px;
+  border-left: 1px solid var(--color-secondary);
+}
+
+.file-tree .file-tree-items .sub-items .item-file {
+  padding-left: 18px;
+}
+
+.file-tree .file-tree-items .item-file.selected {
+  color: var(--color-text);
+  background: var(--color-active);
+  border-radius: 4px;
+}
+
+.file-tree .file-tree-items .item-file.viewed {
+  color: var(--color-text-light-3);
+}
+
+.file-tree .file-tree-items .item-directory {
+  user-select: none;
+}
+
+.file-tree .file-tree-items .item-file,
+.file-tree .file-tree-items .item-directory {
+  display: flex;
+  align-items: center;
+  gap: 0.25em;
+  padding: 6px;
+}
+
+.file-tree .file-tree-items .item-file:hover,
+.file-tree .file-tree-items .item-directory:hover {
+  color: var(--color-text);
+  background: var(--color-hover);
+  border-radius: 4px;
+  cursor: pointer;
+}
+
 .ui.message.unicode-escape-prompt {
   margin-bottom: 0;
   border-radius: 0;

web_src/js/features/repo-diff-filetree.ts

@@ -1,13 +1,58 @@
 import {createApp} from 'vue';
-import DiffFileTree from '../components/DiffFileTree.vue';
+import {toggleElem} from '../utils/dom.ts';
+import {diffTreeStore} from '../modules/stores.ts';
+import {setFileFolding} from './file-fold.ts';
 import DiffFileList from '../components/DiffFileList.vue';
 
+const LOCAL_STORAGE_KEY = 'diff_file_tree_visible';
+
+function hashChangeListener() {
+  for (const el of document.querySelectorAll<HTMLAnchorElement>('.file-tree-items .item-file')) {
+    el.classList.toggle('selected', el.hash === `${window.location.hash}`);
+  }
+  expandSelectedFile(window.location.hash);
+}
+
+function expandSelectedFile(selectedItem) {
+  // expand file if the selected file is folded
+  if (selectedItem) {
+    const box = document.querySelector(selectedItem);
+    const folded = box?.getAttribute('data-folded') === 'true';
+    if (folded) setFileFolding(box, box.querySelector('.fold-file'), false);
+  }
+}
+
+function updateState(visible) {
+  const btn = document.querySelector('.diff-toggle-file-tree-button');
+  const [toShow, toHide] = btn.querySelectorAll('.icon');
+  const tree = document.querySelector('#diff-file-tree');
+  const newTooltip = btn.getAttribute(visible ? 'data-hide-text' : 'data-show-text');
+  btn.setAttribute('data-tooltip-content', newTooltip);
+  toggleElem(tree, visible);
+  toggleElem(toShow, !visible);
+  toggleElem(toHide, visible);
+}
+
 export function initDiffFileTree() {
   const el = document.querySelector('#diff-file-tree');
   if (!el) return;
 
-  const fileTreeView = createApp(DiffFileTree);
-  fileTreeView.mount(el);
+  const store = diffTreeStore();
+  store.fileTreeIsVisible = localStorage.getItem(LOCAL_STORAGE_KEY) !== 'false';
+  document.querySelector('.diff-toggle-file-tree-button').addEventListener('click', () => {
+    store.fileTreeIsVisible = !store.fileTreeIsVisible;
+    localStorage.setItem(LOCAL_STORAGE_KEY, store.fileTreeIsVisible);
+    updateState(store.fileTreeIsVisible);
+  });
+
+  hashChangeListener();
+  window.addEventListener('hashchange', hashChangeListener);
+
+  for (const el of document.querySelectorAll<HTMLInputElement>('.file-tree-items .item-directory')) {
+    el.addEventListener('click', () => {
+      toggleElem(el.nextElementSibling);
+    });
+  }
 }
 
 export function initDiffFileList() {

web_src/js/features/repo-diff.ts

@@ -166,7 +166,7 @@ function onShowMoreFiles() {
 }
 
 export async function loadMoreFiles(url) {
-  const target = document.querySelector('a#diff-show-more-files');
+  const target = document.querySelector('a.diff-show-more-files');
   if (target?.classList.contains('disabled') || pageData.diffFileInfo.isLoadingNewData) {
     return;
   }
@@ -195,7 +195,7 @@ export async function loadMoreFiles(url) {
 }
 
 function initRepoDiffShowMore() {
-  $(document).on('click', 'a#diff-show-more-files', (e) => {
+  $(document).on('click', 'a.diff-show-more-files', (e) => {
     e.preventDefault();
 
     const linkLoadMore = e.target.getAttribute('data-href');