Update RefExtractor to handle atom feeds

app/controllers/tree_controller.rb

 # Controller for viewing a repository's file structure
 class TreeController < ApplicationController
-  # Thrown when given an invalid path
-  class InvalidPathError < StandardError; end
-
   include RefExtractor
   layout "project"

lib/ref_extractor.rb

 # Module providing an extract_ref method for controllers working with Git
 # tree-ish + path params
 module RefExtractor
-  # Thrown when given an invalid path
+  # Raised when given an invalid path
   class InvalidPathError < StandardError; end
   # Given a string containing both a Git ref - such as a branch or tag - and a
@@ -81,6 +81,12 @@ module RefExtractor
   # Automatically renders `not_found!` if a valid tree could not be resolved
   # (e.g., when a user inserts an invalid path or ref).
   def assign_ref_vars
+    # Handle formats embedded in the id
+    if params[:id].ends_with?('.atom')
+      params[:id].gsub!(/\.atom$/, '')
+      request.format = :atom
+    end
+
     @ref, @path = extract_ref(params[:id])
     @id = File.join(@ref, @path)

spec/routing/project_routing_spec.rb

@@ -293,11 +293,7 @@ end
 #    patch_project_commit GET    /:project_id/commits/:id/patch(.:format) commits#patch
 #         project_commits GET    /:project_id/commits(.:format)           commits#index
 #                         POST   /:project_id/commits(.:format)           commits#create
-#      new_project_commit GET    /:project_id/commits/new(.:format)       commits#new
-#     edit_project_commit GET    /:project_id/commits/:id/edit(.:format)  commits#edit
 #          project_commit GET    /:project_id/commits/:id(.:format)       commits#show
-#                         PUT    /:project_id/commits/:id(.:format)       commits#update
-#                         DELETE /:project_id/commits/:id(.:format)       commits#destroy
 describe CommitsController, "routing" do
   it "to #compare" do
     get("/gitlabhq/commits/compare").should route_to('commits#compare', project_id: 'gitlabhq')
@@ -307,6 +303,10 @@ describe CommitsController, "routing" do
     get("/gitlabhq/commits/1/patch").should route_to('commits#patch', project_id: 'gitlabhq', id: '1')
   end
+  it "does something with atom feeds" do
+    get("/gitlabhq/commits/master.atom").should route_to('commits#show', project_id: 'gitlabhq', id: 'master.atom')
+  end
+
   it_behaves_like "RESTful project resources" do
     let(:actions)    { [:index, :show] }
     let(:controller) { 'commits' }
@@ -425,6 +425,7 @@ end
 # /:project_id/commits/*path
 #   /gitlabhq/commits/master/app/contexts/base_context.rb
 #   /gitlabhq/commits/test/branch/name/app/contexts/base_context.rb
+#   /gitlabhq/commits/master.atom
 #
 # /:project_id/raw/*path
 #   /gitlabhq/raw/master/app/contexts/base_context.rb
@@ -436,13 +437,6 @@ end
 describe "pending routing" do
   before { pending }
-  describe "/:project_id/commit/:id" do
-    it "routes to a specific commit" do
-      get("/gitlabhq/commit/f4b1449").should route_to('commit#show', project_id: 'gitlabhq', id: 'f4b1449')
-      get("/gitlabhq/commit/f4b14494ef6abf3d144c28e4af0c20143383e062").should route_to('commit#show', project_id: 'gitlabhq', id: 'f4b14494ef6abf3d144c28e4af0c20143383e062')
-    end
-  end
-
   describe "/:project_id/raw/:id" do
     it "routes to a ref with a path" do
       get("/gitlabhq/raw/master/app/models/project.rb").should route_to('raw#show', project_id: 'gitlabhq', id: 'master/app/models/project.rb')