1 files changed, 13 insertions, 0 deletions

diff --git a/js/codemirror/mode/diff/diff.js b/js/codemirror/mode/diff/diff.js
new file mode 100644
index 00000000..725bb2c7
--- /dev/null
+++ b/js/codemirror/mode/diff/diff.js
@@ -0,0 +1,13 @@
+CodeMirror.defineMode("diff", function() {
+  return {
+    token: function(stream) {
+      var ch = stream.next();
+      stream.skipToEnd();
+      if (ch == "+") return "plus";
+      if (ch == "-") return "minus";
+      if (ch == "@") return "rangeinfo";
+    }
+  };
+});
+
+CodeMirror.defineMIME("text/x-diff", "diff");