Add "Copy" button to file view of raw text (go-gitea#21629)

If a raw text file is displayed, a copy button of the text is enabled.

* Closes go-gitea#12866

### Before

![image](https://user-images.githubusercontent.com/20454870/198898628-df1bcb0c-79d7-4ffb-95e4-441d77430827.png)

### After

![image](https://user-images.githubusercontent.com/20454870/199988152-ea1099ad-29e1-4765-a9ca-4c03c1737453.png)

#### Rendered files and binaries have their button disabled

![image](https://user-images.githubusercontent.com/20454870/199988408-73de6327-5e9e-462b-b2b6-8c3f5b878386.png)

![image](https://user-images.githubusercontent.com/20454870/199988563-844f8656-f48d-4929-880e-b6558c1c054a.png)

Signed-off-by: Yarden Shoham <hrsi88@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

options/locale/locale_en-US.ini

@@ -88,6 +88,7 @@ edit = Edit
 
 copy = Copy
 copy_url = Copy URL
+copy_content = Copy content
 copy_branch = Copy branch name
 copy_success = Copied!
 copy_error = Copy failed
@@ -1090,6 +1091,7 @@ editor.cannot_edit_non_text_files = Binary files cannot be edited in the web int
 editor.edit_this_file = Edit File
 editor.this_file_locked = File is locked
 editor.must_be_on_a_branch = You must be on a branch to make or propose changes to this file.
+editor.only_copy_raw = You may only copy raw text files.
 editor.fork_before_edit = You must fork this repository to make or propose changes to this file.
 editor.delete_this_file = Delete File
 editor.must_have_write_access = You must have write access to make or propose changes to this file.

templates/repo/view_file.tmpl

@@ -60,6 +60,11 @@
 					{{end}}
 				</div>
 				<a download href="{{$.RawFileLink}}"><span class="btn-octicon tooltip" data-content="{{.locale.Tr "repo.download_file"}}" data-position="bottom center">{{svg "octicon-download"}}</span></a>
+				{{if or .IsMarkup .IsRenderedHTML (not .IsTextSource)}}
+				<span class="btn-octicon tooltip disabled" id="copy-file-content" data-content="{{.locale.Tr "repo.editor.only_copy_raw"}}" aria-label="{{.locale.Tr "repo.editor.only_copy_raw"}}">{{svg "octicon-copy" 14}}</span>
+				{{else}}
+				<a class="btn-octicon tooltip" id="copy-file-content" data-content="{{.locale.Tr "copy_content"}}" aria-label="{{.locale.Tr "copy_content"}}">{{svg "octicon-copy" 14}}</a>
+				{{end}}
 				{{if .Repository.CanEnableEditor}}
 					{{if .CanEditFile}}
 						<a href="{{.RepoLink}}/_edit/{{PathEscapeSegments .BranchName}}/{{PathEscapeSegments .TreePath}}"><span class="btn-octicon tooltip" data-content="{{.EditFileTooltip}}" data-position="bottom center">{{svg "octicon-pencil"}}</span></a>

web_src/js/features/repo-code.js

@@ -1,9 +1,11 @@
 import $ from 'jquery';
 import {svg} from '../svg.js';
 import {invertFileFolding} from './file-fold.js';
-import {createTippy} from '../modules/tippy.js';
+import {createTippy, showTemporaryTooltip} from '../modules/tippy.js';
 import {copyToClipboard} from './clipboard.js';
 
+const {i18n} = window.config;
+
 function changeHash(hash) {
   if (window.history.pushState) {
     window.history.pushState(null, null, hash);
@@ -110,6 +112,18 @@ function showLineButton() {
   });
 }
 
+function initCopyFileContent() {
+  // get raw text for copy content button, at the moment, only one button (and one related file content) is supported.
+  const copyFileContent = document.querySelector('#copy-file-content');
+  if (!copyFileContent) return;
+
+  copyFileContent.addEventListener('click', async () => {
+    const text = Array.from(document.querySelectorAll('.file-view .lines-code')).map((el) => el.textContent).join('');
+    const success = await copyToClipboard(text);
+    showTemporaryTooltip(copyFileContent, success ? i18n.copy_success : i18n.copy_error);
+  });
+}
+
 export function initRepoCodeView() {
   if ($('.code-view .lines-num').length > 0) {
     $(document).on('click', '.lines-num span', function (e) {
@@ -185,4 +199,5 @@ export function initRepoCodeView() {
     if (!success) return;
     document.querySelector('.code-line-button')?._tippy?.hide();
   });
+  initCopyFileContent();
 }