create atom feed for commits

app/controllers/commits_controller.rb

@@ -24,6 +24,7 @@ class CommitsController < ApplicationController
     respond_to do |format|
       format.html # index.html.erb
       format.js
+      format.atom { render :layout => false }
     end
   end
 

app/views/commits/index.atom.builder

+xml.instruct!
+xml.feed "xmlns" => "http://www.w3.org/2005/Atom", "xmlns:media" => "http://search.yahoo.com/mrss/" do
+  xml.title   "Recent commits to #{@project.name}:#{@ref}"
+  xml.link    :href => project_commits_url(@project, :atom, :ref => @ref), :rel => "self", :type => "application/atom+xml"
+  xml.link    :href => project_commits_url(@project), :rel => "alternate", :type => "text/html"
+  xml.id      project_commits_url(@project)
+  xml.updated @commits.first.committed_date.strftime("%Y-%m-%dT%H:%M:%SZ") if @commits.any?
+
+  @commits.each do |commit|
+    xml.entry do
+      xml.id      project_commit_url(@project, :id => commit.id)
+      xml.link    :href => project_commit_url(@project, :id => commit.id)
+      xml.title   truncate(commit.safe_message, :length => 80)
+      xml.updated commit.committed_date.strftime("%Y-%m-%dT%H:%M:%SZ")
+      xml.media   :thumbnail, :width => "40", :height => "40", :url => gravatar_icon(commit.author_email)
+      xml.author do |author|
+        xml.name commit.author_name
+        xml.email commit.author_email
+      end
+      xml.summary commit.safe_message
+    end
+  end
+end

app/views/layouts/project.html.haml

@@ -5,6 +5,8 @@
       GitLab #{" - #{@project.name}" if @project && !@project.new_record?}
     = stylesheet_link_tag    "application"
     = javascript_include_tag "application"
+    - if current_page?(tree_project_path(@project)) || current_page?(project_commits_path(@project))
+      = auto_discovery_link_tag(:atom, project_commits_url(@project, :atom, :ref => @ref), :title => "Recent commits to #{@project.name}:#{@ref}")
     = csrf_meta_tags
     = javascript_tag do
       REQ_URI = "#{request.env["REQUEST_URI"]}";

spec/requests/commits_spec.rb

@@ -25,6 +25,15 @@ describe "Commits" do
       page.should have_content(commit.author)
       page.should have_content(commit.message)
     end
+
+    it "should render atom feed" do
+      visit project_commits_path(project, :atom)
+
+      page.response_headers['Content-Type'].should have_content("application/atom+xml")
+      page.body.should have_selector("title", :text => "Recent commits to #{project.name}")
+      page.body.should have_selector("author email", :text => commit.author_email)
+      page.body.should have_selector("entry summary", :text => commit.message)
+    end
   end
 
   describe "GET /commits/:id" do