From 5b5298bac05ac272d6aafee73990d6b098c35bce Mon Sep 17 00:00:00 2001
From: Go MAEDA <maeda@farend.jp>
Date: Sat, 4 May 2019 10:26:31 +0000
Subject: Merged r18122 from trunk to 4.0-stable (#29259).

git-svn-id: http://svn.redmine.org/redmine/branches/4.0-stable@18123 e93f8b46-1217-0410-a6f0-8f06a7374b81
---
 lib/redmine/syntax_highlighting.rb | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'lib/redmine/syntax_highlighting.rb')

diff --git a/lib/redmine/syntax_highlighting.rb b/lib/redmine/syntax_highlighting.rb
index 400f805ec..6232228ce 100644
--- a/lib/redmine/syntax_highlighting.rb
+++ b/lib/redmine/syntax_highlighting.rb
@@ -50,6 +50,14 @@ module Redmine
       rescue
         false
       end
+
+      def filename_supported?(filename)
+        if highlighter.respond_to? :filename_supported?
+          highlighter.filename_supported? filename
+        else
+          false
+        end
+      end
     end
 
     module Rouge
@@ -99,7 +107,11 @@ module Redmine
         def language_supported?(language)
           find_lexer(language.to_s.downcase) ? true : false
         end
-        
+
+        def filename_supported?(filename)
+          !::Rouge::Lexer.guesses(:filename => filename).empty?
+        end
+
         private
         # Alias names used by CodeRay and not supported by Rouge
         LANG_ALIASES = {
-- 
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