"""Implementation of compile_html based on markdown."""

import codecs
import os
import re

from markdown import markdown

from nikola.plugin_categories import PageCompiler


class CompileMarkdown(PageCompiler):
    """Compile reSt into HTML."""

    name = "markdown"

    def compile_html(self, source, dest):
        try:
            os.makedirs(os.path.dirname(dest))
        except:
            pass
        with codecs.open(dest, "w+", "utf8") as out_file:
            with codecs.open(source, "r", "utf8") as in_file:
                data = in_file.read()
            output = markdown(data, ['fenced_code', 'codehilite'])
            # remove the H1 because there is "title" h1.
            output = re.sub(r'<h1>.*</h1>', '', output)
            # python-markdown's highlighter uses the class 'codehilite' to wrap
            # code, # instead of the standard 'code'. None of the standard
            # pygments stylesheets use this class, so swap it to be 'code'
            output = re.sub(r'(<div[^>]+class="[^"]*)codehilite([^>]+)',
                            r'\1code\2', output)
            out_file.write(output)