Use readme we support to render if there are multiple readmes

app/helpers/tree_helper.rb

@@ -21,6 +21,16 @@ module TreeHelper
     tree.html_safe
   end
+  def render_readme(readme)
+    if Gitlab::MarkdownHelper.gitlab_markdown?(readme.name)
+      preserve(markdown(readme.data))
+    elsif Gitlab::MarkdownHelper.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
   #
   # type - String type of the tree item; either 'folder' or 'file'
@@ -38,20 +48,6 @@ module TreeHelper
     "file_#{hexdigest(content.name)}"
   end
-  # Public: Determines if a given filename is compatible with GitHub::Markup.
-  #
-  # filename - Filename string to check
-  #
-  # Returns boolean
-  def markup?(filename)
-    filename.downcase.end_with?(*%w(.textile .rdoc .org .creole .wiki .mediawiki
-                                    .rst .adoc .asciidoc .asc))
-  end
-
-  def gitlab_markdown?(filename)
-    filename.downcase.end_with?(*%w(.mdown .md .markdown))
-  end
-
   # Simple shortcut to File.join
   def tree_join(*args)
     File.join(*args)
@@ -94,7 +90,8 @@ module TreeHelper
   end
   def editing_preview_title(filename)
-    if gitlab_markdown?(filename) || markup?(filename)
+    if Gitlab::MarkdownHelper.gitlab_markdown?(filename) ||
+       Gitlab::MarkdownHelper.markup?(filename)
       'Preview'
     else
       'Diff'

app/models/tree.rb

@@ -6,7 +6,24 @@ class Tree
     git_repo = repository.raw_repository
     @entries = Gitlab::Git::Tree.where(git_repo, sha, path)
-    if readme_tree = @entries.find(&:readme?)
+    available_readmes = @entries.select(&:readme?)
+
+    if available_readmes.count > 0
+      # If there is more than 1 readme in tree, find readme which is supported
+      # by markup renderer.
+      if available_readmes.length > 1
+        supported_readmes = available_readmes.select do |readme|
+          Gitlab::MarkdownHelper.gitlab_markdown?(readme.name) ||
+          Gitlab::MarkdownHelper.markup?(readme.name)
+        end
+
+        # Take the first supported readme, or the first available readme, if we
+        # don't support any of them
+        readme_tree = supported_readmes.first || available_readmes.first
+      else
+        readme_tree = available_readmes.first
+      end
+
       readme_path = path == '/' ? readme_tree.name : File.join(path, readme_tree.name)
       @readme = Gitlab::Git::Blob.find(git_repo, sha, readme_path)
     end

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

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

app/views/projects/edit_tree/preview.html.haml

 .diff-file
   .diff-content
-    - if gitlab_markdown?(@blob.name)
+    - if Gitlab::MarkdownHelper.gitlab_markdown?(@blob.name)
       .file-content.wiki
         = preserve do
           = markdown(@content)
-    - elsif markup?(@blob.name)
+    - elsif Gitlab::MarkdownHelper.markup?(@blob.name)
       .file-content.wiki
         = raw GitHub::Markup.render(@blob.name, @content)
     - else

app/views/projects/tree/_readme.html.haml

@@ -3,10 +3,4 @@
     %i.icon-file
     = readme.name
   .wiki
-    - if gitlab_markdown?(readme.name)
-      = preserve do
-        = markdown(readme.data)
-    - elsif markup?(readme.name)
-      = render_markup(readme.name, readme.data)
-    - else
-      = simple_format(readme.data)
+    = render_readme(readme)

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

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

lib/gitlab/markdown_helper.rb

+module Gitlab
+  module MarkdownHelper
+    module_function
+
+    # Public: Determines if a given filename is compatible with GitHub::Markup.
+    #
+    # filename - Filename string to check
+    #
+    # Returns boolean
+    def markup?(filename)
+      filename.downcase.end_with?(*%w(.textile .rdoc .org .creole .wiki
+                                      .mediawiki .rst .adoc .asciidoc .asc))
+    end
+
+    # Public: Determines if a given filename is compatible with
+    # GitLab-flavored Markdown.
+    #
+    # filename - Filename string to check
+    #
+    # Returns boolean
+    def gitlab_markdown?(filename)
+      filename.downcase.end_with?(*%w(.mdown .md .markdown))
+    end
+  end
+end

spec/helpers/tree_helper_spec.rb

-require 'spec_helper'
-
-describe TreeHelper do
-  describe '#markup?' do
-    %w(textile rdoc org creole wiki mediawiki
-       rst adoc asciidoc asc).each do |type|
-      it "returns true for #{type} files" do
-        markup?("README.#{type}").should be_true
-      end
-    end
-
-    it "returns false when given a non-markup filename" do
-      markup?('README.rb').should_not be_true
-    end
-  end
-end

spec/lib/gitlab/gitlab_markdown_helper_spec.rb

+require 'spec_helper'
+
+describe Gitlab::MarkdownHelper do
+  describe '#markup?' do
+    %w(textile rdoc org creole wiki
+       mediawiki rst adoc asciidoc asc).each do |type|
+      it "returns true for #{type} files" do
+        Gitlab::MarkdownHelper.markup?("README.#{type}").should be_true
+      end
+    end
+
+    it 'returns false when given a non-markup filename' do
+      Gitlab::MarkdownHelper.markup?('README.rb').should_not be_true
+    end
+  end
+
+  describe '#gitlab_markdown?' do
+    %w(mdown md markdown).each do |type|
+      it "returns true for #{type} files" do
+        Gitlab::MarkdownHelper.gitlab_markdown?("README.#{type}").should be_true
+      end
+    end
+
+    it 'returns false when given a non-markdown filename' do
+      Gitlab::MarkdownHelper.gitlab_markdown?('README.rb').should_not be_true
+    end
+  end
+end