from app import app
from markupsafe import Markup
from markdown import markdown
from markdown.extensions.codehilite import CodeHiliteExtension
from markdown.extensions.footnotes import FootnoteExtension
from markdown.extensions.toc import TocExtension

from app.utils.markdown_extensions.pclinks import PCLinkExtension


@app.template_filter('md')
def md(text):
    """
    Converts markdown to html5
    """

    options = 0
    extensions = [
        # 'admonition',
        'fenced_code',
        'nl2br',
        'sane_lists',
        'tables',
        CodeHiliteExtension(linenums=True, use_pygments=True),
        FootnoteExtension(UNIQUE_IDS=True),
        TocExtension(baselevel=2),
        PCLinkExtension(),
    ]

    def escape(text):
        text = text.replace("&", "&")
        text = text.replace("<", "&lt;")
        text = text.replace(">", "&gt;")
        return text

    # Escape html chars because markdown does not
    safe = escape(text)
    out = markdown(safe, options=options, extensions=extensions)

    return Markup(out)