Merge pull request #2067 from riyad/diff-and-patch-for-commits-and-merge-requests

Diff and patch for commits and merge requests

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

app/models/merge_request.rb

@@ -202,20 +202,22 @@ class MergeRequest < ActiveRecord::Base
     false
   end
 
-  def to_raw
-    FileUtils.mkdir_p(Rails.root.join("tmp", "patches"))
-    patch_path = Rails.root.join("tmp", "patches", "merge_request_#{self.id}.patch")
-
-    from = commits.last.id
-    to = source_branch
-
-    project.repo.git.run('', "format-patch" , " > #{patch_path.to_s}", {}, ["#{from}..#{to}", "--stdout"])
-
-    patch_path
-  end
-
   def mr_and_commit_notes
     commit_ids = commits.map(&:id)
     Note.where("(noteable_type = 'MergeRequest' AND noteable_id = :mr_id) OR (noteable_type = 'Commit' AND noteable_id IN (:commit_ids))", mr_id: id, commit_ids: commit_ids)
   end
+
+  # Returns the raw diff for this merge request
+  #
+  # see "git diff"
+  def to_diff
+    project.repo.git.native(:diff, {timeout: 30, raise: true}, "#{target_branch}...#{source_branch}")
+  end
+
+  # Returns the commit as a series of email patches.
+  #
+  # see "git format-patch"
+  def to_patch
+    project.repo.git.format_patch({timeout: 30, raise: true, stdout: true}, "#{target_branch}..#{source_branch}")
+  end
 end