From d3730b071365dd3dbfa0b8ec4433e1f18a93c969 Mon Sep 17 00:00:00 2001
From: Douwe Maan <douwe@gitlab.com>
Date: Wed, 9 Sep 2015 14:54:34 +0100
Subject: [PATCH] Fix highlighting of deleted lines in diffs.

---
 CHANGELOG                               |  1 +
 config/initializers/rouge_diff_lexer.rb | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 config/initializers/rouge_diff_lexer.rb

diff --git a/CHANGELOG b/CHANGELOG
index 247eb1e3643..ddb31fc430f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -40,6 +40,7 @@ v 8.0.0 (unreleased)
   - Add ability to get user information by ID of an SSH key via the API
   - Fix bug which IE cannot show image at markdown when the image is raw file	of gitlab  
   - Add support for Crowd
+  - Fix highlighting of deleted lines in diffs.
 
 v 7.14.1
   - Improve abuse reports management from admin area
diff --git a/config/initializers/rouge_diff_lexer.rb b/config/initializers/rouge_diff_lexer.rb
new file mode 100644
index 00000000000..fdb2d7b748e
--- /dev/null
+++ b/config/initializers/rouge_diff_lexer.rb
@@ -0,0 +1,24 @@
+# Here until https://github.com/jneen/rouge/pull/297 is merged into Rouge and the gem is updated in GitLab.
+module Rouge
+  module Lexers
+    class Diff
+      def self.analyze_text(text)
+        return 1   if text.start_with?('Index: ')
+        return 1   if text.start_with?('diff ')
+        return 0.9 if text.start_with?('--- ')
+      end
+
+      state :root do
+        rule(/^ .*\n/, Text)
+        rule(/^---\n/, Text)
+        rule(/^\+.*\n/, Generic::Inserted)
+        rule(/^-+.*\n/, Generic::Deleted)
+        rule(/^!.*\n/, Generic::Strong)
+        rule(/^@.*\n/, Generic::Subheading)
+        rule(/^([Ii]ndex|diff).*\n/, Generic::Heading)
+        rule(/^=.*\n/, Generic::Heading)
+        rule(/.*\n/, Text)
+      end
+    end
+  end
+end