Initial commit of github-trailing-whitespace

gh-trailing-ws.user.js

@@ -0,0 +1,12 @@
+lines = document.getElementsByClassName('blob-code-inner')
+for(var i=0; i<lines.length; i++) {
+    var line = lines[i];
+    var lastChild = line.childNodes[line.childNodes.length-1];
+    if(lastChild.nodeType == lastChild.TEXT_NODE && /^\s+$/.test(lastChild.textContent)) {
+        var span = document.createElement('span');
+        span.className = 'x';
+        span.innerText = lastChild.textContent;
+        line.insertBefore(span, lastChild);
+        line.removeChild(lastChild);
+    }
+}

manifest.json

@@ -0,0 +1,10 @@
+{
+  "name": "GitHub Trailing Whitespace",
+  "description": "This extension highlights trailing whitespace on GitHub diffs",
+  "version": "1.0",
+  "manifest_version": 2,
+  "content_scripts": [{
+      "js": ["gh-trailing-ws.user.js"],
+      "matches": ["https://github.com/*"]
+   }]
+}