create atom feed for issues

app/controllers/issues_controller.rb

@@ -22,6 +22,7 @@ class IssuesController < ApplicationController
     respond_to do |format|
       format.html # index.html.erb
       format.js
+      format.atom { render :layout => false }
     end
   end
 

app/views/issues/index.atom.builder

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

app/views/layouts/project.html.haml

@@ -7,6 +7,8 @@
     = 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}")
+    - if request.path == project_issues_path(@project)
+      = auto_discovery_link_tag(:atom, project_issues_url(@project, :atom), :title => "#{@project.name} issues")
     = csrf_meta_tags
     = javascript_tag do
       REQ_URI = "#{request.env["REQUEST_URI"]}";

spec/requests/issues_spec.rb

@@ -27,6 +27,15 @@ describe "Issues" do
     it { should have_content(@issue.project.name) }
     it { should have_content(@issue.assignee.name) }
 
+    it "should render atom feed" do
+      visit project_issues_path(project, :atom)
+
+      page.response_headers['Content-Type'].should have_content("application/atom+xml")
+      page.body.should have_selector("title", :text => "#{project.name} issues")
+      page.body.should have_selector("author email", :text => @issue.author_email)
+      page.body.should have_selector("entry summary", :text => @issue.title)
+    end
+
     describe "Destroy" do
       before do
         # admin access to remove issue