Merge branch 'plain-readme' into 'master'

Properly render plain readme

## Before

![Screenshot_2015-07-09_11.38.16](https://gitlab.com/gitlab-org/gitlab-ce/uploads/ba53ad380060eba368aed4ecc71ff4da/Screenshot_2015-07-09_11.38.16.png)

## After

![Screenshot_2015-07-09_11.37.38](https://gitlab.com/gitlab-org/gitlab-ce/uploads/b154c5464c3f89d3ed7a0e7157ee6c58/Screenshot_2015-07-09_11.37.38.png)

cc @rspeicher

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !945

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/gitlab/markup_helper.rb b/lib/gitlab/markup_helper.rb
index f99be969d3e..b1991e2e285 100644
--- a/lib/gitlab/markup_helper.rb
+++ b/lib/gitlab/markup_helper.rb
@@ -33,6 +33,16 @@ module Gitlab
       filename.downcase.end_with?(*%w(.adoc .ad .asciidoc))
     end
 
+    # Public: Determines if the given filename is plain text.
+    #
+    # filename - Filename string to check
+    #
+    # Returns boolean
+    def plain?(filename)
+      filename.downcase.end_with?('.txt') ||
+        filename.downcase == 'readme'
+    end
+
     def previewable?(filename)
       markup?(filename)
     end