Extract Git::Patches#find_line from Git::Line

lib/pronto/git/line.rb

@@ -21,13 +21,8 @@ def commit_line
         @commit_line ||= begin
           patches = patch.repo.show_commit(commit_sha)
 
-          commit_patch = patches.find do |p|
-            patch.new_file_full_path == p.new_file_full_path
-          end
-
-          lines = commit_patch ? commit_patch.lines : []
-          result = lines.find { |l| blame[:orig_start_line_number] == l.new_lineno }
-
+          result = patches.find_line(patch.new_file_full_path,
+                                     blame[:orig_start_line_number])
           result || self # no commit_line means that it was just added
         end
       end

lib/pronto/git/patches.rb

@@ -13,6 +13,12 @@ def initialize(repo, commit, patches)
       def each(&block)
         @patches.each(&block)
       end
+
+      def find_line(path, line)
+        patch = find { |p| p.new_file_full_path == path }
+        lines = patch ? patch.lines : []
+        lines.find { |l| l.new_lineno == line }
+      end
     end
   end
 end

spec/pronto/git/patches_spec.rb

@@ -0,0 +1,22 @@
+require 'spec_helper'
+
+module Pronto
+  module Git
+    describe Patches do
+      describe '#find_line' do
+        subject { Patches.new(repo, commit, patches).find_line(path, line) }
+
+        let(:repo) { nil }
+        let(:commit) { nil }
+
+        let(:path) { '/test.rb' }
+        let(:line) { 1 }
+
+        context 'no patches' do
+          let(:patches) { [] }
+          it { should be_nil }
+        end
+      end
+    end
+  end
+end