from django import template
from django.utils.safestring import mark_safe
import markdown
import bleach
from django.utils.html import escape
from markdown.extensions import Extension

class EscapeHtml(Extension):
    def extendMarkdown(self, md):
        md.preprocessors.deregister('html_block')
        md.inlinePatterns.deregister('html')

register = template.Library()

md = markdown.Markdown(extensions=["fenced_code", "nl2br", "smarty", "codehilite", EscapeHtml()])

@register.filter(needs_autoescape=True)
def markdown(value, autoescape=True):
    html = mark_safe(bleach.linkify(md.convert(value)))
    # html = value
    md.reset()
    return html

@register.filter(needs_autoescape=True)
def nl_br(value, autoescape=True):
    html = mark_safe(value.replace("\n", "<br>"))
    return html