Allow tildes or backticks in the fenced_code extension to support the syntax used by github

4 files changed, 158 insertions, 2 deletions

diff --git a/markdown/extensions/fenced_code.py b/markdown/extensions/fenced_code.py
index e5b3350..87cdfc8 100644
--- a/markdown/extensions/fenced_code.py
+++ b/markdown/extensions/fenced_code.py
@@ -49,6 +49,8 @@ Language tags:
     <pre><code class="python"># Some python code
     </code></pre>
 
+Optionally backticks instead of tildes as per how github's code block markdown is identified.
+
 Copyright 2007-2008 [Waylan Limberg](http://achinghead.com/).
 
 Project website: <http://www.freewisdom.org/project/python-markdown/Fenced__Code__Blocks>
@@ -69,7 +71,7 @@ from markdown.extensions.codehilite import CodeHilite, CodeHiliteExtension
 
 # Global vars
 FENCED_BLOCK_RE = re.compile( \
-    r'(?P<fence>^~{3,})[ ]*(\{?\.(?P<lang>[a-zA-Z0-9_-]*)\}?)?[ ]*\n(?P<code>.*?)(?P=fence)[ ]*$',
+    r'(?P<fence>^(?:~{3,}|`{3,}))[ ]*(\{?\.(?P<lang>[a-zA-Z0-9_-]*)\}?)?[ ]*\n(?P<code>.*?)(?P=fence)[ ]*$',
     re.MULTILINE|re.DOTALL
     )
 CODE_WRAP = '<pre><code%s>%s</code></pre>'
diff --git a/tests/extensions/fenced_code_blocks.html b/tests/extensions/fenced_code_blocks.html
new file mode 100644
index 0000000..4a0a625
--- /dev/null
+++ b/tests/extensions/fenced_code_blocks.html
@@ -0,0 +1,70 @@
+Xo<pre><code>Fenced
+</code></pre>
+
+<p>Code block starting and ending with empty lines:</p>
+
+<pre><code><br /><br />Fenced
+
+
+</code></pre>
+
+<p>Indented code block containing fenced code block sample:</p>
+
+<pre><code>~~~
+Fenced
+~~~
+</code></pre>
+
+<p>Fenced code block with indented code block sample:</p>
+
+<pre><code>Some text
+
+    Indented code block sample code
+</code></pre>
+
+<p>Fenced code block with long markers:</p>
+
+<pre><code>Fenced
+</code></pre>
+
+<p>Fenced code block with fenced code block markers of different length in it:</p>
+
+<pre><code>In code block
+~~~
+Still in code block
+~~~~~
+Still in code block
+</code></pre>
+
+<p>Fenced code block with Markdown header and horizontal rule:</p>
+
+<pre><code>#test
+---
+</code></pre>
+
+<p>Fenced code block with link definitions, footnote definition and 
+abbreviation definitions:</p>
+
+<pre><code>[example]: http://example.com/
+
+[^1]: Footnote def
+
+*[HTML]: HyperText Markup Language
+</code></pre>
+
+<pre><code>[example]: http://backticks.com/
+
+[^1]: Footnote def
+
+*[HTML]: HyperText Markup Language
+</code></pre>
+
+<pre><code>testing tildes in backticks
+
+~~~
+</code></pre>
+
+<pre><code>testing tildes in backticks
+
+```
+</code></pre>
diff --git a/tests/extensions/fenced_code_blocks.txt b/tests/extensions/fenced_code_blocks.txt
new file mode 100644
index 0000000..be0f997
--- /dev/null
+++ b/tests/extensions/fenced_code_blocks.txt
@@ -0,0 +1,80 @@
+~~~
+Fenced
+~~~
+
+Code block starting and ending with empty lines:
+~~~
+
+
+Fenced
+
+
+~~~
+
+Indented code block containing fenced code block sample:
+
+	~~~
+	Fenced
+	~~~
+
+Fenced code block with indented code block sample:
+
+~~~
+Some text
+
+	Indented code block sample code
+~~~
+
+Fenced code block with long markers:
+
+~~~~~~~~~~~~~~~~~~
+Fenced
+~~~~~~~~~~~~~~~~~~
+
+Fenced code block with fenced code block markers of different length in it:
+
+~~~~
+In code block
+~~~
+Still in code block
+~~~~~
+Still in code block
+~~~~
+
+Fenced code block with Markdown header and horizontal rule:
+
+~~~
+#test
+---
+~~~
+
+Fenced code block with link definitions, footnote definition and 
+abbreviation definitions:
+
+~~~
+[example]: http://example.com/
+
+[^1]: Footnote def
+
+*[HTML]: HyperText Markup Language
+~~~
+
+```
+[example]: http://backticks.com/
+
+[^1]: Footnote def
+
+*[HTML]: HyperText Markup Language
+```
+
+`````
+testing tildes in backticks
+
+~~~
+`````
+
+~~~
+testing backticks in tildes
+
+```
+~~~
diff --git a/tests/extensions/test.cfg b/tests/extensions/test.cfg
index 671f2a5..c271b02 100644
--- a/tests/extensions/test.cfg
+++ b/tests/extensions/test.cfg
@@ -4,7 +4,7 @@ extensions=attr_list
 [codehilite]
 extensions=codehilite
 # This passes or not based on version of pygments.
-skip=1 
+skip=1
 
 [toc]
 extensions=toc
@@ -20,3 +20,7 @@ extensions=toc
 
 [wikilinks]
 extensions=wikilinks
+
+[fenced_code_blocks]
+extensions=fenced_code
+normalize=1