# Wrapper for loading templates from the filesystem.

from django.conf import settings
from django.template import TemplateDoesNotExist
import os

def get_template_sources(template_name, template_dirs=None):
    if not template_dirs:
        template_dirs = settings.TEMPLATE_DIRS
    for template_dir in template_dirs:
        yield os.path.join(template_dir, template_name)

def load_template_source(template_name, template_dirs=None):
    tried = []
    for filepath in get_template_sources(template_name, template_dirs):
        try:
            return (open(filepath).read(), filepath)
        except IOError:
            tried.append(filepath)
    if template_dirs:
        error_msg = "Tried %s" % tried
    else:
        error_msg = "Your TEMPLATE_DIRS setting is empty. Change it to point to at least one template directory."
    raise TemplateDoesNotExist, error_msg
load_template_source.is_usable = True
