From bb06e905efb1722502d71059c21add8cfde851aa Mon Sep 17 00:00:00 2001
From: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Date: Mon, 1 Apr 2013 16:03:11 +0300
Subject: [PATCH] added Gitlab::Git::Compare for git compare feature

---
 lib/gitlab/git/compare.rb | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 lib/gitlab/git/compare.rb

diff --git a/lib/gitlab/git/compare.rb b/lib/gitlab/git/compare.rb
new file mode 100644
index 00000000..1fa43062
--- /dev/null
+++ b/lib/gitlab/git/compare.rb
@@ -0,0 +1,37 @@
+module Gitlab
+  module Git
+    class Compare
+      attr_accessor :commits, :commit, :diffs, :same
+
+      def initialize(repository, from, to)
+        @commits, @diffs = [], []
+        @commit = nil
+        @same = false
+
+        return unless from && to
+
+        first = repository.commit(to.try(:strip))
+        last = repository.commit(from.try(:strip))
+
+        return unless first && last
+
+        if first.id == last.id
+          @same = true
+          return
+        end
+
+        @commit = Commit.new(first)
+
+        @commits = repository.commits_between(last.id, first.id)
+        @commits = @commits.map { |c| Commit.new(c) }
+
+        @diffs = if @commits.size > 100
+                   []
+                 else
+                   repository.repo.diff(last.id, first.id) rescue []
+                 end
+      end
+    end
+  end
+end
+