Add README to list of files in project page if activity feed setting in use

Closes #2044

app/helpers/projects_helper.rb

@@ -231,37 +231,20 @@ module ProjectsHelper
     end
   end
 
-  def changelog_path(project)
-    if project && changelog = project.repository.changelog
-      namespace_project_blob_path(
-        project.namespace,
-        project,
-        tree_join(project.default_branch,
-                  changelog.name)
-      )
+  def readme_path(project)
+    filename_path(project, :readme)
   end
+
+  def changelog_path(project)
+    filename_path(project, :changelog)
   end
 
   def license_path(project)
-    if project && license = project.repository.license
-      namespace_project_blob_path(
-        project.namespace,
-        project,
-        tree_join(project.default_branch,
-                  license.name)
-      )
-    end
+    filename_path(project, :license)
   end
 
   def version_path(project)
-    if project && version = project.repository.version
-      namespace_project_blob_path(
-        project.namespace,
-        project,
-        tree_join(project.default_branch,
-                  version.name)
-      )
-    end
+    filename_path(project, :version)
   end
 
   def hidden_pass_url(original_url)
@@ -331,4 +314,17 @@ module ProjectsHelper
       count
     end
   end
+
+  private
+
+  def filename_path(project, filename)
+    if project && blob = project.repository.send(filename)
+      namespace_project_blob_path(
+          project.namespace,
+          project,
+          tree_join(project.default_branch,
+                    blob.name)
+      )
+    end
+  end
 end

app/views/projects/show.html.haml

@@ -23,18 +23,21 @@
       = link_to namespace_project_tags_path(@project.namespace, @project) do
         = pluralize(number_with_delimiter(@repository.tag_names.count), 'tag')
 
+    - if !prefer_readme? && @repository.readme
+      %li
+        = link_to 'Readme', readme_path(@project)
+
     - if @repository.changelog
       %li
-        = link_to changelog_path(@project) do
-          Changelog
+        = link_to 'Changelog', changelog_path(@project)
+
     - if @repository.license
       %li
-        = link_to license_path(@project) do
-          License
+        = link_to 'License', license_path(@project)
+
     - if @repository.contribution_guide
       %li
-        = link_to contribution_guide_path(@project) do
-          Contribution guide
+        = link_to 'Contribution guide', contribution_guide_path(@project)
 
     - if current_user && can_push_branch?(@project, @project.default_branch)
       - unless @repository.changelog