Add diff hunks to notification emails on MR

Added diff hunks to notification emails of messages on merge requests. This
provides code context to the note. Uses existing template for formatting
a diff for email (from repository push notifications).

2 files changed, 9 insertions, 1 deletions

diff --git a/app/views/notify/note_merge_request_email.html.haml b/app/views/notify/note_merge_request_email.html.haml
index ea7e3d199fd..de3f32e6415 100644
--- a/app/views/notify/note_merge_request_email.html.haml
+++ b/app/views/notify/note_merge_request_email.html.haml
@@ -1,7 +1,15 @@
+= content_for :head do
+  = stylesheet_link_tag 'mailers/highlighted_diff_email'
+
 - if @note.diff_note? && @note.diff_file
   %p.details
     New comment on diff for
     = link_to @note.diff_file.file_path, @target_url
     \:
 
+    .diff-content.code.js-syntax-highlight
+      %table
+        - Discussion.new([@note]).truncated_diff_lines.each do |line|
+          = render "projects/diffs/line", line: line, diff_file: @note.diff_file, plain: true
+
 = render 'note_message'
diff --git a/app/views/notify/repository_push_email.html.haml b/app/views/notify/repository_push_email.html.haml
index 307c5a11206..25883de257c 100644
--- a/app/views/notify/repository_push_email.html.haml
+++ b/app/views/notify/repository_push_email.html.haml
@@ -1,5 +1,5 @@
 = content_for :head do
-  = stylesheet_link_tag 'mailers/repository_push_email'
+  = stylesheet_link_tag 'mailers/highlighted_diff_email'
 
 %h3
   #{@message.author_name} #{@message.action_name} #{@message.ref_type} #{@message.ref_name}