mirror of https://github.com/zulip/zulip.git
68 lines
2.2 KiB
Python
68 lines
2.2 KiB
Python
import re
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import markdown
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from zephyr.lib.avatar import gravatar_hash
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from zephyr.lib.bugdown import codehilite
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class Gravatar(markdown.inlinepatterns.Pattern):
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def handleMatch(self, match):
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# NB: the first match of our regex is match.group(2) due to
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# markdown internal matches
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img = markdown.util.etree.Element('img')
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img.set('class', 'message_body_gravatar img-rounded')
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img.set('src', 'https://secure.gravatar.com/avatar/%s?d=identicon&s=30'
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% (gravatar_hash(match.group(2)),))
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return img
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class Bugdown(markdown.Extension):
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def extendMarkdown(self, md, md_globals):
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del md.inlinePatterns['image_link']
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del md.inlinePatterns['image_reference']
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del md.parser.blockprocessors['hashheader']
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del md.parser.blockprocessors['setextheader']
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md.inlinePatterns.add('gravatar', Gravatar(r'!gravatar\(([^)]*)\)'), '_begin')
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# We need to re-initialize the markdown engine every 30 messages
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# due to some sort of performance leak in the markdown library.
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MAX_MD_ENGINE_USES = 30
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_md_engine = None
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_use_count = 0
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# A link starts after whitespace, and cannot contain spaces,
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# end parentheses, or end brackets (which would confuse Markdown).
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# FIXME: Use one of the actual linkification extensions.
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_link_regex = re.compile(r'(\s|\A)(?P<url>https?://[^\s\])]+)')
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def _linkify(match):
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url = match.group('url')
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return ' [%s](%s) ' % (url, url)
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def convert(md):
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"""Convert Markdown to HTML, with Humbug-specific settings and hacks."""
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global _md_engine, _use_count
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if _md_engine is None:
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_md_engine = markdown.Markdown(
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safe_mode = 'escape',
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output_format = 'xhtml',
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extensions = ['fenced_code', 'nl2br',
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codehilite.makeExtension(configs=[('force_linenos', False)]),
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Bugdown()])
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md = _link_regex.sub(_linkify, md)
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try:
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html = _md_engine.convert(md)
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except:
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# FIXME: Do something more reasonable here!
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html = '<p>[Humbug note: Sorry, we could not understand the formatting of your message]</p>'
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_use_count += 1
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if _use_count >= MAX_MD_ENGINE_USES:
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_md_engine = None
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_use_count = 0
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return html
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