mistune结合pygments，自定义展现

#-*- coding: utf-8 -*-

import re
import mistune
from pygments import highlight
from pygments.lexers import get_lexer_by_name, get_all_lexers
from pygments.formatters import html

class ExtRenderer(mistune.Renderer):

    def block_code(self, code, lang):
        if not lang :
            return '\n<pre><code>%s</code></pre>\n' % \
                mistune.escape(code)
        try:
            lexer = get_lexer_by_name(lang, stripall=True)
        except:
            return '\n<pre><code>%s</code></pre>\n' % \
                mistune.escape(code)
        formatter = html.HtmlFormatter()
        return highlight(code, lexer, formatter)

    def link(self, link, title, text):
        u'''
        新窗口打开超链接
        '''
        if link.startswith('javascript:'):
            link = ''
        if not title:
            return '<a href="%s" target="_blank">%s</a>' % (link, text)
        title = escape(title, quote=True)
        return '<a href="%s" title="%s" target="_blank">%s</a>' % (link, title, text)

    def ext_center(self, text):
        u'''
        居中显示
        '''
        return '<p align="center">%s</p>' % text

class ExtInlineLexer(mistune.InlineLexer):
    def enable_ext_center(self):
        # add wiki_link rules
        self.rules.ext_center = re.compile(
            r'\[\['                   # [[
            r'([\s\S]+?)'             # text 
            r'\]\](?!\])'             # ]]
        )

        self.default_rules.insert(3, 'ext_center')

    def output_ext_center(self, m):
        text = m.group(1)
        text = self.output(text)
        return self.renderer.ext_center(text)

Flask过滤器

@app.template_filter('markdown')
def markdown(value):
    u'''
    markdown
    '''
    renderer = ExtRenderer()
    inline = ExtInlineLexer(renderer)
    inline.enable_ext_center()
    markdown = mistune.Markdown(renderer=renderer, inline=inline)
    return markdown(value)