#!/usr/bin/python
# -*- coding: utf-8; tab-width: 4; indent-tabs-mode: nil; -*-

from singleton import Singleton
from template import render
from functools import partial


class WSGITemplate( object ):
    __metaclass__ = Singleton

    def __init__( self, basedir=None ):
        import os
        self.__basedir = os.path.normpath( os.path.join( os.path.split(__file__)[0], basedir ) ) + '/'


    def template(self, filename=None ):
        def real_decorator( wsgi_application ):
            def wrapper( environ, start_response ):
                environ[ 'template' ] = partial( render, filename= self.__basedir + filename )
                environ[ 'basedir' ] = self.__basedir
                return wsgi_application( environ, start_response )
            return wrapper
        return real_decorator