Simplify and unify helpers for rendering markup

app/helpers/application_helper.rb

@@ -222,7 +222,9 @@ module ApplicationHelper
   end
 
   def render_markup(file_name, file_content)
-    if asciidoc?(file_name)
+    if gitlab_markdown?(file_name)
+      Haml::Helpers.preserve(markdown(file_content))
+    elsif asciidoc?(file_name)
       asciidoc(file_content)
     else
       GitHub::Markup.render(file_name, file_content).

app/helpers/tree_helper.rb

@@ -25,15 +25,7 @@ module TreeHelper
   end
 
   def render_readme(readme)
-    if gitlab_markdown?(readme.name)
-      preserve(markdown(readme.data))
-    elsif asciidoc?(readme.name)
-      asciidoc(readme.data)
-    elsif markup?(readme.name)
     render_markup(readme.name, readme.data)
-    else
-      simple_format(readme.data)
-    end
   end
 
   # Return an image icon depending on the file type and mode

app/views/projects/blob/_text.html.haml

-- if gitlab_markdown?(blob.name)
-  .file-content.wiki
-    = preserve do
-      = markdown(blob.data)
-- elsif markup?(blob.name)
+- if markup?(blob.name)
   .file-content.wiki
     = render_markup(blob.name, blob.data)
 - else

app/views/search/results/_snippet_blob.html.haml

@@ -13,16 +13,7 @@
       .file-title
         %i.fa.fa-file
         %strong= snippet_blob[:snippet_object].file_name
-      - if gitlab_markdown?(snippet_blob[:snippet_object].file_name)
-        .file-content.wiki
-          - snippet_blob[:snippet_chunks].each do |snippet|
-            - unless snippet[:data].empty?
-              = preserve do
-                = markdown(snippet[:data])
-            - else
-              .file-content.code
-                .nothing-here-block Empty file
-      - elsif markup?(snippet_blob[:snippet_object].file_name)
+      - if markup?(snippet_blob[:snippet_object].file_name)
         .file-content.wiki
           - snippet_blob[:snippet_chunks].each do |snippet|
             - unless snippet[:data].empty?

app/views/shared/snippets/_blob.html.haml

 - unless @snippet.content.empty?
-  - if gitlab_markdown?(@snippet.file_name)
-    .file-content.wiki
-      = preserve do
-        = markdown(@snippet.data)
-  - elsif markup?(@snippet.file_name)
+  - if markup?(@snippet.file_name)
     .file-content.wiki
       = render_markup(@snippet.file_name, @snippet.data)
   - else

lib/gitlab/markup_helper.rb

@@ -8,8 +8,10 @@ module Gitlab
     #
     # Returns boolean
     def markup?(filename)
+      gitlab_markdown?(filename) ||
+        asciidoc?(filename) ||
         filename.downcase.end_with?(*%w(.textile .rdoc .org .creole .wiki
-                                      .mediawiki .rst .adoc .ad .asciidoc))
+                                        .mediawiki .rst))
     end
 
     # Public: Determines if a given filename is compatible with
@@ -32,7 +34,7 @@ module Gitlab
     end
 
     def previewable?(filename)
-      gitlab_markdown?(filename) || markup?(filename)
+      markup?(filename)
     end
   end
 end

spec/helpers/application_helper_spec.rb

@@ -269,6 +269,13 @@ describe ApplicationHelper do
       expect(render_markup('foo.rst', content).encoding.name).to eq('UTF-8')
     end
 
+    it "should delegate to #markdown when file name corresponds to Markdown" do
+      expect(self).to receive(:gitlab_markdown?).with('foo.md').and_return(true)
+      expect(self).to receive(:markdown).and_return('NOEL')
+
+      expect(render_markup('foo.md', content)).to eq('NOEL')
+    end
+
     it "should delegate to #asciidoc when file name corresponds to AsciiDoc" do
       expect(self).to receive(:asciidoc?).with('foo.adoc').and_return(true)
       expect(self).to receive(:asciidoc).and_return('NOEL')

spec/lib/gitlab/markup_helper_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Gitlab::MarkupHelper do
   describe '#markup?' do
     %w(textile rdoc org creole wiki
-       mediawiki rst adoc ad asciidoc).each do |type|
+       mediawiki rst adoc ad asciidoc mdown md markdown).each do |type|
       it "returns true for #{type} files" do
         expect(Gitlab::MarkupHelper.markup?("README.#{type}")).to be_truthy
       end