From fdf78014dbb9f1c701e538a0ea29f9c536c91448 Mon Sep 17 00:00:00 2001
From: Hiroshi Shirosaki <h.shirosaki@gmail.com>
Date: Wed, 23 Dec 2015 18:35:33 +0900
Subject: [PATCH] Fix fenced code block highlight with c++

Add `+` to language characters.
---
 syntax/markdown.vim |  4 ++--
 test/syntax.vader   | 11 +++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index 92ff871..5ee9cc4 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -69,9 +69,9 @@ syn match  mkdLineBreak    /  \+$/
 syn region mkdBlockquote   start=/^\s*>/                   end=/$/ contains=mkdLineBreak,mkdLineContinue,@Spell
 syn region mkdCode         start=/\(\([^\\]\|^\)\\\)\@<!`/ end=/\(\([^\\]\|^\)\\\)\@<!`/
 syn region mkdCode         start=/\s*``[^`]*/              end=/[^`]*``\s*/
-syn region mkdCode         start=/^\s*```\s*[0-9A-Za-z_-]*\s*$/          end=/^\s*```\s*$/
+syn region mkdCode         start=/^\s*```\s*[0-9A-Za-z_+-]*\s*$/          end=/^\s*```\s*$/
 syn region mkdCode         start=/\s*\~\~[^\~]*/              end=/[^\~]*\~\~\s*/
-syn region mkdCode         start=/^\s*\~\~\~\s*[0-9A-Za-z_-]*\s*$/          end=/^\s*\~\~\~\s*$/
+syn region mkdCode         start=/^\s*\~\~\~\s*[0-9A-Za-z_+-]*\s*$/          end=/^\s*\~\~\~\s*$/
 syn region mkdCode         start="<pre[^>]*>"              end="</pre>"
 syn region mkdCode         start="<code[^>]*>"             end="</code>"
 syn region mkdFootnote     start="\[^"                     end="\]"
diff --git a/test/syntax.vader b/test/syntax.vader
index 0b2c860..8b9b21a 100644
--- a/test/syntax.vader
+++ b/test/syntax.vader
@@ -155,6 +155,17 @@ code
 Execute (code blocks can have a language specifier):
   AssertEqual SyntaxOf('c'), 'mkdCode'
 
+Given markdown;
+```c++
+code
+```
+
+text
+
+Execute (code blocks can be fenced with backticks and a language specifier):
+  AssertEqual SyntaxOf('code'), 'mkdCode'
+  AssertNotEqual SyntaxOf('text'), 'mkdCode'
+
 # Math
 
 Given markdown;
-- 
2.39.2