Footnote ids contain dashes when outputing HTML5.

Previously they contained colons - and they still do for HTML4 and XHTML.
Fixes #180.

Author: Waylan Limberg

docs/release-2.3.txt

@@ -23,6 +23,12 @@ The whitelesited schemes are: 'http', 'https', 'ftp', 'ftps', 'mailto',
 'news'. Schemeless urls are also permitted, but are checked in other ways - 
 as they have been for some time.
 
+* The ids assigned to footnotes now contain a dash (`-`) rather than a colon
+(`:`) when `output_format` it set to "html5" or "xhtml5". If you are making
+reference to those ids in your JavaScript or CSS and using the HTML5 output,
+you will need to update your code accordingly. No changes are necessary if
+you are outputing XHTML (the default) or HTML4.
+
 What's New in Python-Markdown 2.3
 ---------------------------------
 

markdown/__init__.py

@@ -132,9 +132,9 @@ def __init__(self, *args, **kwargs):
 
         self.references = {}
         self.htmlStash = util.HtmlStash()
+        self.set_output_format(kwargs.get('output_format', 'xhtml1'))
         self.registerExtensions(extensions=kwargs.get('extensions', []),
                                 configs=kwargs.get('extension_configs', {}))
-        self.set_output_format(kwargs.get('output_format', 'xhtml1'))
         self.reset()
 
     def build_parser(self):

markdown/extensions/footnotes.py

@@ -62,6 +62,9 @@ def extendMarkdown(self, md, md_globals):
         md.registerExtension(self)
         self.parser = md.parser
         self.md = md
+        self.sep = ':'
+        if self.md.output_format in ['html5', 'xhtml5']:
+            self.sep = '-'
         # Insert a preprocessor before ReferencePreprocessor
         md.preprocessors.add("footnote", FootnotePreprocessor(self),
                              "<reference")
@@ -106,16 +109,16 @@ def setFootnote(self, id, text):
     def makeFootnoteId(self, id):
         """ Return footnote link id. """
         if self.getConfig("UNIQUE_IDS"):
-            return 'fn:%d-%s' % (self.unique_prefix, id)
+            return 'fn%s%d-%s' % (self.sep, self.unique_prefix, id)
         else:
-            return 'fn:%s' % id
+            return 'fn%s%s' % (self.sep, id)
 
     def makeFootnoteRefId(self, id):
         """ Return footnote back-link id. """
         if self.getConfig("UNIQUE_IDS"):
-            return 'fnref:%d-%s' % (self.unique_prefix, id)
+            return 'fnref%s%d-%s' % (self.sep, self.unique_prefix, id)
         else:
-            return 'fnref:%s' % id
+            return 'fnref%s%s' % (self.sep, id)
 
     def makeFootnotesDiv(self, root):
         """ Return div of footnotes as et Element. """
@@ -171,7 +174,6 @@ def run(self, lines):
         """
         newlines = []
         i = 0
-        #import pdb; pdb.set_trace() #for i, line in enumerate(lines):
         while True:
             m = DEF_RE.match(lines[i])
             if m: