EVOLUTION-MANAGER

Edit File: wikilinks.py

'''
WikiLinks Extension for Python-Markdown
======================================

Converts [[WikiLinks]] to relative links.  Requires Python-Markdown 2.0+

Basic usage:

>>> import markdown
 >>> text = "Some text with a [[WikiLink]]."
 >>> html = markdown.markdown(text, ['wikilinks'])
 >>> print html
 Some text with a <a class="wikilink" href="/WikiLink/">WikiLink</a>.

Whitespace behavior:

>>> print markdown.markdown('[[ foo bar_baz ]]', ['wikilinks'])
 <a class="wikilink" href="/foo_bar_baz/">foo bar_baz</a>
 >>> print markdown.markdown('foo [[ ]] bar', ['wikilinks'])
 foo bar

To define custom settings the simple way:

>>> print markdown.markdown(text, 
 ... ['wikilinks(base_url=/wiki/,end_url=.html,html_class=foo)']
 ... )
 Some text with a <a class="foo" href="/wiki/WikiLink.html">WikiLink</a>.
 
Custom settings the complex way:

>>> md = markdown.Markdown(
 ... extensions = ['wikilinks'], 
 ... extension_configs = {'wikilinks': [
 ... ('base_url', 'http://example.com/'), 
 ... ('end_url', '.html'),
 ... ('html_class', '') ]},
 ... safe_mode = True)
 >>> print md.convert(text)
 Some text with a <a href="http://example.com/WikiLink.html">WikiLink</a>.

Use MetaData with mdx_meta.py (Note the blank html_class in MetaData):

>>> text = """wiki_base_url: http://example.com/
 ... wiki_end_url: .html
 ... wiki_html_class:
 ...
 ... Some text with a [[WikiLink]]."""
 >>> md = markdown.Markdown(extensions=['meta', 'wikilinks'])
 >>> print md.convert(text)
 Some text with a <a href="http://example.com/WikiLink.html">WikiLink</a>.

MetaData should not carry over to next document:

>>> print md.convert("No [[MetaData]] here.")
 No <a class="wikilink" href="/MetaData/">MetaData</a> here.

Define a custom URL builder:

>>> def my_url_builder(label, base, end):
 ... return '/bar/'
 >>> md = markdown.Markdown(extensions=['wikilinks'], 
 ... extension_configs={'wikilinks' : [('build_url', my_url_builder)]})
 >>> print md.convert('[[foo]]')
 <a class="wikilink" href="/bar/">foo</a>

From the command line:

python markdown.py -x wikilinks(base_url=http://example.com/,end_url=.html,html_class=foo) src.txt

By [Waylan Limberg](http://achinghead.com/).

License: [BSD](http://www.opensource.org/licenses/bsd-license.php)

Dependencies:
* [Python 2.3+](http://python.org)
* [Markdown 2.0+](http://packages.python.org/Markdown/)
'''

from __future__ import absolute_import
from __future__ import unicode_literals
from . import Extension
from ..inlinepatterns import Pattern
from ..util import etree
import re

def build_url(label, base, end):
    """ Build a url from the label, a base, and an end. """
    clean_label = re.sub(r'([ ]+_)|(_[ ]+)|([ ]+)', '_', label)
    return '%s%s%s'% (base, clean_label, end)

class WikiLinkExtension(Extension):
 def __init__(self, configs):
 # set extension defaults
 self.config = {
 'base_url' : ['/', 'String to append to beginning or URL.'],
 'end_url' : ['/', 'String to append to end of URL.'],
 'html_class' : ['wikilink', 'CSS hook. Leave blank for none.'],
 'build_url' : [build_url, 'Callable formats URL from label.'],
 }
 configs = dict(configs) or {}
 # Override defaults with user settings
 for key, value in configs.items():
 self.setConfig(key, value)
 
 def extendMarkdown(self, md, md_globals):
 self.md = md
 
 # append to end of inline patterns
 WIKILINK_RE = r'\[\[([\w0-9_ -]+)\]\]'
 wikilinkPattern = WikiLinks(WIKILINK_RE, self.getConfigs())
 wikilinkPattern.md = md
 md.inlinePatterns.add('wikilink', wikilinkPattern, "<not_strong")

class WikiLinks(Pattern):
    def __init__(self, pattern, config):
        super(WikiLinks, self).__init__(pattern)
        self.config = config
  
    def handleMatch(self, m):
        if m.group(2).strip():
            base_url, end_url, html_class = self._getMeta()
            label = m.group(2).strip()
            url = self.config['build_url'](label, base_url, end_url)
            a = etree.Element('a')
            a.text = label 
            a.set('href', url)
            if html_class:
                a.set('class', html_class)
        else:
            a = ''
        return a

def _getMeta(self):
        """ Return meta data or config data. """
        base_url = self.config['base_url']
        end_url = self.config['end_url']
        html_class = self.config['html_class']
        if hasattr(self.md, 'Meta'):
            if 'wiki_base_url' in self.md.Meta:
                base_url = self.md.Meta['wiki_base_url'][0]
            if 'wiki_end_url' in self.md.Meta:
                end_url = self.md.Meta['wiki_end_url'][0]
            if 'wiki_html_class' in self.md.Meta:
                html_class = self.md.Meta['wiki_html_class'][0]
        return base_url, end_url, html_class

def makeExtension(configs=None) :
    return WikiLinkExtension(configs=configs)