Copy citation file content, in APA and BibTex format, on repo home page

options/locale/locale_en-US.ini

@@ -1013,10 +1013,12 @@ unstar = Unstar
 star = Star
 fork = Fork
 download_archive = Download Repository
+more_actions = More Actions
 
 no_desc = No Description
 quick_guide = Quick Guide
 clone_this_repo = Clone this repository
+cite_this_repo = Cite this repository
 create_new_repo_command = Creating a new repository on the command line
 push_exist_repo = Pushing an existing repository from the command line
 empty_message = This repository does not contain any content.

package.json

@@ -7,6 +7,10 @@
     "node": ">= 14.0.0"
   },
   "dependencies": {
+    "@citation-js/core": "0.6.1",
+    "@citation-js/plugin-bibtex": "0.6.1",
+    "@citation-js/plugin-csl": "0.6.3",
+    "@citation-js/plugin-software-formats": "0.6.0",
     "@claviska/jquery-minicolors": "2.3.6",
     "@mcaptcha/vanilla-glue": "0.1.0-alpha-3",
     "@primer/octicons": "17.7.0",

routers/web/repo/view.go

@@ -730,6 +730,44 @@ func checkHomeCodeViewable(ctx *context.Context) {
 	ctx.NotFound("Home", fmt.Errorf(ctx.Tr("units.error.no_unit_allowed_repo")))
 }
 
+func checkCitationFile(ctx *context.Context, entry *git.TreeEntry) {
+	if entry.Name() != "" {
+		return
+	}
+	tree, err := ctx.Repo.Commit.SubTree(ctx.Repo.TreePath)
+	if err != nil {
+		ctx.NotFoundOrServerError("Repo.Commit.SubTree", git.IsErrNotExist, err)
+		return
+	}
+	allEntries, err := tree.ListEntries()
+	if err != nil {
+		ctx.ServerError("ListEntries", err)
+		return
+	}
+	for _, entry := range allEntries {
+		if entry.Name() == "CITATION.cff" || entry.Name() == "CITATION.bib" {
+			ctx.Data["CitiationExist"] = true
+			// Read Citation file contents
+			blob := entry.Blob()
+			dataRc, err := blob.DataAsync()
+			if err != nil {
+				ctx.ServerError("DataAsync", err)
+				return
+			}
+			defer dataRc.Close()
+			buf := make([]byte, 1024)
+			n, err := util.ReadAtMost(dataRc, buf)
+			if err != nil {
+				ctx.ServerError("ReadAtMost", err)
+				return
+			}
+			buf = buf[:n]
+			ctx.PageData["citationFileContent"] = string(buf)
+			break
+		}
+	}
+}
+
 // Home render repository home page
 func Home(ctx *context.Context) {
 	isFeed, _, showFeedType := feed.GetFeedType(ctx.Params(":reponame"), ctx.Req)
@@ -954,6 +992,13 @@ func renderCode(ctx *context.Context) {
 		return
 	}
 
+	if !ctx.Repo.Repository.IsEmpty {
+		checkCitationFile(ctx, entry)
+		if ctx.Written() {
+			return
+		}
+	}
+
 	renderLanguageStats(ctx)
 	if ctx.Written() {
 		return

templates/repo/cite/cite_buttons.tmpl

@@ -0,0 +1,11 @@
+<button class="ui basic citation button" id="citation-copy-apa" data-text="">
+APA
+</button>
+<button class="ui basic citation button" id="citation-copy-bibtex" data-text="">
+BibTeX
+</button>
+<!-- the value will be updated by initCitationFileCopyContent, the code below is used to avoid UI flicking  -->
+<input id="citation-copy-content" value="" size="1" readonly>
+<button class="ui basic icon button tooltip" id="citation-clipboard-btn" data-content="{{.locale.Tr "copy"}}" data-clipboard-text="" data-clipboard-target="#citation-copy-content">
+	{{svg "octicon-copy"}}
+</button>

templates/repo/cite/cite_modal.tmpl

@@ -0,0 +1,22 @@
+<div class="ui tiny modal" id="cite-repo-modal">
+    <div class="header">
+        {{.locale.Tr "repo.cite_this_repo"}}
+    </div>
+    <div class="content">
+        <div class="ui stackable secondary menu mobile--margin-between-items mobile--no-negative-margins no-vertical-tabs">
+            <div class="fitted item">
+                <div class="ui action input" id="citation-panel">
+                    {{template "repo/cite/cite_buttons" .}}
+                    <a id="goto-citation-btn" class="ui basic jump icon button tooltip" href="{{$.RepoLink}}/src/{{$.BranchName}}/CITATION.cff" data-position="top right" data-content="{{.locale.Tr "repo.find_file.go_to_file"}}">
+                        {{svg "octicon-file-moved"}}
+                    </a>
+                </div>
+            </div>
+        </div>
+    </div>
+    <div class="actions">
+        <div class="ui black deny button">
+            {{.locale.Tr "cancel"}}
+        </div>
+    </div>
+</div>

templates/repo/home.tmpl

@@ -117,19 +117,23 @@
 				{{if eq $n 0}}
 					<div class="ui action tiny input" id="clone-panel">
 						{{template "repo/clone_buttons" .}}
-						<button id="download-btn" class="ui basic small compact jump dropdown icon button tooltip" data-content="{{.locale.Tr "repo.download_archive"}}" data-position="top right">
-							{{svg "octicon-download"}}
+						<button id="more-btn" class="ui basic small compact jump dropdown icon button tooltip" data-content="{{.locale.Tr "repo.more_actions"}}" data-position="top right">
+							{{svg "octicon-kebab-horizontal"}}
 							<div class="menu">
 								{{if not $.DisableDownloadSourceArchives}}
 									<a class="item archive-link" href="{{$.RepoLink}}/archive/{{PathEscapeSegments $.RefName}}.zip" rel="nofollow">{{svg "octicon-file-zip" 16 "mr-3"}}{{.locale.Tr "repo.download_zip"}}</a>
 									<a class="item archive-link" href="{{$.RepoLink}}/archive/{{PathEscapeSegments $.RefName}}.tar.gz" rel="nofollow">{{svg "octicon-file-zip" 16 "mr-3"}}{{.locale.Tr "repo.download_tar"}}</a>
 									<a class="item archive-link" href="{{$.RepoLink}}/archive/{{PathEscapeSegments $.RefName}}.bundle" rel="nofollow">{{svg "octicon-package" 16 "mr-3"}}{{.locale.Tr "repo.download_bundle"}}</a>
+									{{if .CitiationExist}}
+										<a class="item" id="cite-repo-button">{{svg "octicon-cross-reference" 16 "mr-3"}}{{.locale.Tr "repo.cite_this_repo"}}</a>
+									{{end}}
 								{{end}}
 								<a class="item js-clone-url-vsc" href="vscode://vscode.git/clone?url={{.CloneButtonOriginLink.HTTPS}}">{{svg "gitea-vscode" 16 "mr-3"}}{{.locale.Tr "repo.clone_in_vsc"}}</a>
 							</div>
 						</button>
 						{{template "repo/clone_script" .}}{{/* the script will update `.js-clone-url` and related elements */}}
 					</div>
+					{{template "repo/cite/cite_modal" .}}
 				{{end}}
 				{{if and (ne $n 0) (not .IsViewFile) (not .IsBlame)}}
 					<a class="ui button" href="{{.RepoLink}}/commits/{{.BranchNameSubURL}}/{{.TreePath | PathEscapeSegments}}">

web_src/js/features/citation.js

@@ -0,0 +1,60 @@
+import $ from 'jquery';
+
+const {pageData} = window.config;
+
+const initInputCitationValue = async ($citationCopyBibtex, $citationCopyApa) => {
+  const [{Cite, plugins}] = await Promise.all([
+    import(/* webpackChunkName: "citation-js-core" */'@citation-js/core'),
+    import(/* webpackChunkName: "citation-js-formats" */'@citation-js/plugin-software-formats'),
+    import(/* webpackChunkName: "citation-js-bibtex" */'@citation-js/plugin-bibtex'),
+    import(/* webpackChunkName: "citation-js-bibtex" */'@citation-js/plugin-csl'),
+  ]);
+  const {citationFileContent} = pageData;
+  const config = plugins.config.get('@bibtex');
+  config.constants.fieldTypes.doi = ['field', 'literal'];
+  config.constants.fieldTypes.version = ['field', 'literal'];
+  const citationFormatter = new Cite(citationFileContent);
+  const lang = document.documentElement.lang || 'en-US';
+  const apaOutput = citationFormatter.format('bibliography', {template: 'apa', lang});
+  const bibtexOutput = citationFormatter.format('bibtex', {lang});
+  $citationCopyBibtex.attr('data-text', bibtexOutput);
+  $citationCopyApa.attr('data-text', apaOutput);
+};
+
+export function initCitationFileCopyContent() {
+  const defaultCitationFormat = 'apa'; // apa or bibtex
+
+  if (!pageData.citationFileContent) return;
+
+  const $citationCopyApa = $('#citation-copy-apa');
+  const $citationCopyBibtex = $('#citation-copy-bibtex');
+  const $inputContent = $('#citation-copy-content');
+
+  if ((!$citationCopyApa.length && !$citationCopyBibtex.length) || !$inputContent.length) return;
+  const updateUi = () => {
+    const isBibtex = (localStorage.getItem('citation-copy-format') || defaultCitationFormat) === 'bibtex';
+    const copyContent = (isBibtex ? $citationCopyBibtex : $citationCopyApa).attr('data-text');
+
+    $inputContent.val(copyContent);
+    $citationCopyBibtex.toggleClass('primary', isBibtex);
+    $citationCopyApa.toggleClass('primary', !isBibtex);
+  };
+  initInputCitationValue($citationCopyApa, $citationCopyBibtex).then(updateUi);
+
+  $citationCopyApa.on('click', () => {
+    localStorage.setItem('citation-copy-format', 'apa');
+    updateUi();
+  });
+  $citationCopyBibtex.on('click', () => {
+    localStorage.setItem('citation-copy-format', 'bibtex');
+    updateUi();
+  });
+
+  $inputContent.on('click', () => {
+    $inputContent.select();
+  });
+
+  $('#cite-repo-button').on('click', () => {
+    $('#cite-repo-modal').modal('show');
+  });
+}

web_src/js/features/repo-legacy.js

@@ -21,6 +21,7 @@ import {
   initRepoCommonFilterSearchDropdown,
   initRepoCommonLanguageStats,
 } from './repo-common.js';
+import {initCitationFileCopyContent} from './citation.js';
 import {initCompLabelEdit} from './comp/LabelEdit.js';
 import {initRepoDiffConversationNav} from './repo-diff.js';
 import attachTribute from './tribute.js';
@@ -505,6 +506,7 @@ export function initRepository() {
   }
 
   initRepoCloneLink();
+  initCitationFileCopyContent();
   initRepoCommonLanguageStats();
   initRepoSettingBranches();
 

web_src/less/_repository.less

@@ -227,7 +227,7 @@
       border-right: none;
     }
 
-    #download-btn {
+    #more-btn {
       border-left: none;
     }
 
@@ -2468,6 +2468,56 @@
 
 // End of .repository
 
+#cite-repo-modal {
+  #citation-panel {
+    width: 500px;
+
+    @media @mediaSm {
+      width: 100%;
+    }
+
+    input {
+      border-radius: 0;
+      padding: 5px 10px;
+      width: 50%;
+      line-height: 1.4;
+    }
+
+    .citation.button {
+      font-size: 13px;
+      padding: 7.5px 5px;
+    }
+
+    #citation-copy-content {
+      border-radius: 0;
+      padding: 5px 10px;
+      font-size: 1.2em;
+      line-height: 1.4;
+    }
+
+    #citation-copy-apa,
+    #citation-copy-bibtex {
+      border-right: none;
+    }
+
+    #goto-citation-btn {
+      border-left: none;
+    }
+
+    >:first-child {
+      border-radius: var(--border-radius) 0 0 var(--border-radius) !important;
+    }
+
+    >:last-child {
+      border-radius: 0 var(--border-radius) var(--border-radius) 0 !important;
+    }
+
+    .icon.button {
+      padding: 0 10px;
+    }
+  }
+}
+
 &.user-cards {
   .list {
     padding: 0;