from django.template import Library
from django.conf import settings
from archweb_dev.lib import markdown
import re

register = Library()

class WikiProcessor:
	def run(self, lines):
		in_table = False
		for i in range(len(lines)):
			# Linebreaks
			lines[i] = re.sub("%%", "<br />", lines[i])
			# Internal Links
			lines[i] = re.sub("\(\(([A-z0-9 :/-]+)\)\)", "<a href=\"/wiki/\\1\">\\1</a>", lines[i])
			# Small Text
			lines[i] = re.sub("----([^----]+)----", "<span style=\"font-size:x-small\">\\1</span>", lines[i])
			lines[i] = re.sub("--([^--]+)--",       "<span style=\"font-size:small\">\\1</span>", lines[i])
			# TT text
			lines[i] = re.sub("\{\{([^}\}]+)\}\}",  "<tt>\\1</tt>", lines[i])
			# Tables
			m = re.match("(\|\|)", lines[i])
			if m:
				count = len(re.findall("(\|\|+)", lines[i]))
				first = True
				m2 = re.search("(\|\|+)", lines[i])
				while m2 and count:
					count -= 1
					colspan = len(m2.group(1)) / 2
					if first:
						repl = "<td colspan=\"%d\">" % (colspan)
						first = False
					elif count == 0:
						repl = "</td>"
					else:
						repl = "</td><td colspan=\"%d\">" % (colspan)
					lines[i] = re.sub("(\|\|+)", repl, lines[i], 1)
					# find the next chunk
					m2 = re.search("(\|\|+)", lines[i])
				lines[i] = "<tr>" + lines[i] + "</tr>"
				if not in_table:
					lines[i] = "<table>" + lines[i]
					in_table = True
			elif in_table:
				lines[i] = "</table>" + lines[i]
				in_table = False
		# close leftover table, if open
		if in_table:
			lines[len(lines)] = lines[len(lines)] + "</table>"
		return lines

@register.filter
def wikify(value):
	md = markdown.Markdown(value)
	md.preprocessors.insert(0, WikiProcessor())
	html = md.toString()
	return html