Merge branch '19742-permalink-blame-button-line-number-hash-links' into 'master'

Update permalink/blame buttons with line number fragment hash

Closes #19742

See merge request !9461

4 files changed, 51 insertions, 13 deletions

diff --git a/app/assets/javascripts/blob/blob_line_permalink_updater.js b/app/assets/javascripts/blob/blob_line_permalink_updater.js
new file mode 100644
index 00000000000..c8f68860fbd
--- /dev/null
+++ b/app/assets/javascripts/blob/blob_line_permalink_updater.js
@@ -0,0 +1,35 @@
+const lineNumberRe = /^L[0-9]+/;
+
+const updateLineNumbersOnBlobPermalinks = (linksToUpdate) => {
+  const hash = gl.utils.getLocationHash();
+  if (hash && lineNumberRe.test(hash)) {
+    const hashUrlString = `#${hash}`;
+
+    [].concat(Array.prototype.slice.call(linksToUpdate)).forEach((permalinkButton) => {
+      const baseHref = permalinkButton.getAttribute('data-original-href') || (() => {
+        const href = permalinkButton.getAttribute('href');
+        permalinkButton.setAttribute('data-original-href', href);
+        return href;
+      })();
+      permalinkButton.setAttribute('href', `${baseHref}${hashUrlString}`);
+    });
+  }
+};
+
+function BlobLinePermalinkUpdater(blobContentHolder, lineNumberSelector, elementsToUpdate) {
+  const updateBlameAndBlobPermalinkCb = () => {
+    // Wait for the hash to update from the LineHighlighter callback
+    setTimeout(() => {
+      updateLineNumbersOnBlobPermalinks(elementsToUpdate);
+    }, 0);
+  };
+
+  blobContentHolder.addEventListener('click', (e) => {
+    if (e.target.matches(lineNumberSelector)) {
+      updateBlameAndBlobPermalinkCb();
+    }
+  });
+  updateBlameAndBlobPermalinkCb();
+}
+
+export default BlobLinePermalinkUpdater;
diff --git a/app/assets/javascripts/dispatcher.js b/app/assets/javascripts/dispatcher.js
index 5739a28699f..f0967d4f470 100644
--- a/app/assets/javascripts/dispatcher.js
+++ b/app/assets/javascripts/dispatcher.js
@@ -40,6 +40,7 @@ import BindInOut from './behaviors/bind_in_out';
 import GroupsList from './groups_list';
 import ProjectsList from './projects_list';
 import MiniPipelineGraph from './mini_pipeline_graph_dropdown';
+import BlobLinePermalinkUpdater from './blob/blob_line_permalink_updater';
 
 const ShortcutsBlob = require('./shortcuts_blob');
 const UserCallout = require('./user_callout');
@@ -272,6 +273,13 @@ const UserCallout = require('./user_callout');
           break;
         case 'projects:blame:show':
           new LineHighlighter();
+
+          new BlobLinePermalinkUpdater(
+            document.querySelector('#blob-content-holder'),
+            '.diff-line-num[data-line-number]',
+            document.querySelectorAll('.js-data-file-blob-permalink-url, .js-blob-blame-link'),
+          );
+
           shortcut_handler = new ShortcutsNavigation();
           fileBlobPermalinkUrlElement = document.querySelector('.js-data-file-blob-permalink-url');
           fileBlobPermalinkUrl = fileBlobPermalinkUrlElement && fileBlobPermalinkUrlElement.getAttribute('href');
diff --git a/app/assets/javascripts/line_highlighter.js b/app/assets/javascripts/line_highlighter.js
index 966fcd8ec47..1821ca18053 100644
--- a/app/assets/javascripts/line_highlighter.js
+++ b/app/assets/javascripts/line_highlighter.js
@@ -67,17 +67,7 @@ require('vendor/jquery.scrollTo');
     }
 
     LineHighlighter.prototype.bindEvents = function() {
-      $('#blob-content-holder').on('mousedown', 'a[data-line-number]', this.clickHandler);
-      // While it may seem odd to bind to the mousedown event and then throw away
-      // the click event, there is a method to our madness.
-      //
-      // If not done this way, the line number anchor will sometimes keep its
-      // active state even when the event is cancelled, resulting in an ugly border
-      // around the link and/or a persisted underline text decoration.
-      $('#blob-content-holder').on('click', 'a[data-line-number]', function(event) {
-        event.preventDefault();
-        event.stopPropagation();
-      });
+      $('#blob-content-holder').on('click', 'a[data-line-number]', this.clickHandler);
     };
 
     LineHighlighter.prototype.clickHandler = function(event) {
diff --git a/app/assets/stylesheets/framework/highlight.scss b/app/assets/stylesheets/framework/highlight.scss
index 909a0f4afda..6d27d7568cf 100644
--- a/app/assets/stylesheets/framework/highlight.scss
+++ b/app/assets/stylesheets/framework/highlight.scss
@@ -57,8 +57,13 @@
         visibility: hidden;
       }
 
-      &:hover i {
-        visibility: visible;
+      &:hover,
+      &:focus {
+        outline: none;
+
+        & i {
+          visibility: visible;
+        }
       }
     }
   }