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Custom Markdown extension in Python
import re
import markdown2
class CustomMarkdown(markdown2.Markdown):
"""
Custom markdown processor that we use for task list
"""
reTaskList = re.compile('''
(?P<prefix>[\r\n|\n|\r]*)
-\s\[(?P<done>[x|\s]?)\]\s*(?P<item>.*)
(?P<suffix>[\r\n|\n|\r]*)
''', re.IGNORECASE | re.MULTILINE | re.VERBOSE)
LIST_ITEM_TEMPLATE = '''
<li class="md-task-item %s">
<label class="md-task-label">
<input type="checkbox" %s>
%s
</label>
</li>
'''
def preprocess(self, text):
def replace(match):
item = match.groups()
html = ''
# The starting of the list if denoted by the first group having 2 or more newline chars
if len(item[0]) >= 2:
html += '\n<ul class="md-task-list">'
# Now, toggle the checked status
checked, klass = ('checked="checked"', 'completed') if item[1].lower() == 'x' else ('', 'pending')
html += CustomMarkdown.LIST_ITEM_TEMPLATE % (klass, checked, item[2])
# Similarly, check for ending
if len(item[3]) >= 2:
html += '</ul>\n'
return html
return CustomMarkdown.reTaskList.sub(replace, text)
def markdown(text, html4tags=False, tab_width=markdown2.DEFAULT_TAB_WIDTH,
safe_mode=None, extras=None, link_patterns=None,
use_file_vars=False):
return CustomMarkdown(html4tags=html4tags, tab_width=tab_width,
safe_mode=safe_mode, extras=extras,
link_patterns=link_patterns,
use_file_vars=use_file_vars).convert(text)
TEXT='''
Listify this!
- [ ] Some important task
- [x] A task that is already done
- [ ] Another thing for me to do
'''
print(markdown(TEXT))
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