from django import template
from django.conf import settings
from django.template import Library, Node, TemplateSyntaxError

from settings import PROJECT_ROOT

import yaml
from os.path import join

register = Library()

@register.simple_tag
def navlist():
	'''Generates a navigation list from a yaml file with syntax: 

Heading1:
  - name: A link
    href: /alink
  - name: Another link
    href: /anotherlink
Heading2:
  - name: A link
    href: /alink
  - name: Another link
    href: /anotherlink
	'''
	
	out = [] 
	tree = yaml.load(open(join(PROJECT_ROOT, 'menu.yaml')).read())

	for section in tree.keys():
		out.append('''\
		<div class="heading" 
		     id="heading-%s">%s</div>
		<div class="section" id="section-%s">
		''' % (section.lower(), section.lower(), section, section.lower()))
			
		items = tree[section]
		for item in items:
			out.append('''\
			<div>
				<a class="navlink" href="%s">%s</a>
			</div>\
			''' % (item.get('href'), item.get('name')))

		out.append('</div>')

	return ''.join(out)