1 files changed, 30 insertions, 4 deletions
diff --git a/app/assets/javascripts/copy_to_clipboard.js b/app/assets/javascripts/copy_to_clipboard.js
index 6dbec50b890..ab9a8e43dd1 100644
--- a/app/assets/javascripts/copy_to_clipboard.js
+++ b/app/assets/javascripts/copy_to_clipboard.js
@@ -38,9 +38,35 @@ showTooltip = function(target, title) {
 };
 
 $(function() {
-  var clipboard;
-
-  clipboard = new Clipboard('[data-clipboard-target], [data-clipboard-text]');
+  const clipboard = new Clipboard('[data-clipboard-target], [data-clipboard-text]');
   clipboard.on('success', genericSuccess);
-  return clipboard.on('error', genericError);
+  clipboard.on('error', genericError);
+
+  // This a workaround around ClipboardJS limitations to allow the context-specific copy/pasting of plain text or GFM.
+  // The Ruby `clipboard_button` helper sneaks a JSON hash with `text` and `gfm` keys into the `data-clipboard-text`
+  // attribute that ClipboardJS reads from.
+  // When ClipboardJS creates a new `textarea` (directly inside `body`, with a `readonly` attribute`), sets its value
+  // to the value of this data attribute, focusses on it, and finally programmatically issues the 'Copy' command,
+  // this code intercepts the copy command/event at the last minute to deconstruct this JSON hash and set the
+  // `text/plain` and `text/x-gfm` copy data types to the intended values.
+  $(document).on('copy', 'body > textarea[readonly]', function(e) {
+    const clipboardData = e.originalEvent.clipboardData;
+    if (!clipboardData) return;
+
+    const text = e.target.value;
+
+    let json;
+    try {
+      json = JSON.parse(text);
+    } catch (ex) {
+      return;
+    }
+
+    if (!json.text || !json.gfm) return;
+
+    e.preventDefault();
+
+    clipboardData.setData('text/plain', json.text);
+    clipboardData.setData('text/x-gfm', json.gfm);
+  });
 });