From 246faa3d7a60ea2296a24d0c5de1a71a7a48854b Mon Sep 17 00:00:00 2001
From: Riyad Preukschas <riyad@informatik.uni-bremen.de>
Date: Thu, 22 Nov 2012 20:49:01 +0100
Subject: [PATCH] Add Commit#to_diff for raw diff

---
 app/models/commit.rb | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/app/models/commit.rb b/app/models/commit.rb
index 5efb20ce..200c915a 100644
--- a/app/models/commit.rb
+++ b/app/models/commit.rb
@@ -150,4 +150,19 @@ class Commit
   def parents_count
     parents && parents.count || 0
   end
+
+  # Shows the diff between the commit's parent and the commit.
+  #
+  # Cuts out the header and stats from #to_patch and returns only the diff.
+  def to_diff
+    # see Grit::Commit#show
+    patch = to_patch
+
+    # discard lines before the diff
+    lines = patch.split("\n")
+    while !lines.first.start_with?("diff --git") do
+      lines.shift
+    end
+    lines.join("\n")
+  end
 end