Django snippets

#---- addons/template_loader.py ----
"""
Wrapper for loading templates from "template" directories in arbitrary modules.
"""

import os

from django.conf import settings
from django.template import TemplateDoesNotExist
from addons import get_module_dir

def get_template_sources(template_name, template_dirs=None):
    delimiter = ':'
    
    if not delimiter in template_name: return []
    
    # Find the delimiter in the name and split by it
    i = template_name.find(delimiter)
    app, template_path = template_name[:i], template_name[i+1:]
    
    # Get the directory for the app and make sure that is indeed a directory
    app_dir = get_module_dir(app)
    parts = (app_dir, 'templates', template_path)
    
    # Normalize the path
    template_path = '/'.join(parts)
    
    # Return it as a list for iteration
    return [os.path.normpath(template_path)]

def load_template_source(template_name, template_dirs=None):
    for filepath in get_template_sources(template_name, template_dirs):
        try:
            return (open(filepath).read().decode(settings.FILE_CHARSET), filepath)
        except IOError:
            pass
    raise TemplateDoesNotExist, template_name
load_template_source.is_usable = True


#---- addons/util.py ----
import inspect
from os import path

def import_module(module_name):
    module = __import__(module_name, globals(), locals(), [], -1)    
    components =  module_name.split('.')
    for component in components[1:]:
        module = getattr(module, component)

    return module

def get_module_path(module_name):
    module = import_module(module_name)
    return inspect.getsourcefile(module)

def get_module_dir(module_name):
    return path.dirname(get_module_path(module_name))