text: from importlib import import_module
  import inspect
  import os
  import re
  
  from django import template
  from django.template import RequestContext
  from django.conf import settings
  from django.contrib.admin.views.decorators import staff_member_required
  from django.db import models
  from django.shortcuts import render_to_response
  from django.core.exceptions import ImproperlyConfigured, ViewDoesNotExist
  from django.http import Http404
  from django.core import urlresolvers
  from django.contrib.admindocs import utils
  from django.contrib.sites.models import Site
  from django.utils._os import upath
  from django.utils import six
  from django.utils.translation import ugettext as _
  
  # Exclude methods starting with these strings from documentation
  MODEL_METHODS_EXCLUDE = ('_', 'add_', 'delete', 'save', 'set_')
  
  class GenericSite(object):
      domain = 'example.com'
      name = 'my site'
  
  @staff_member_required
  def doc_index(request):
      if not utils.docutils_is_available:
          return missing_docutils_page(request)
      return render_to_response('admin_doc/index.html', {
          'root_path': urlresolvers.reverse('admin:index'),
      }, context_instance=RequestContext(request))
  
  @staff_member_required
  def bookmarklets(request):
      admin_root = urlresolvers.reverse('admin:index')
      return render_to_response('admin_doc/bookmarklets.html', {
          'root_path': admin_root,
          'admin_url': "%s://%s%s" % (request.scheme, request.get_host(), admin_root),
      }, context_instance=RequestContext(request))
  
  @staff_member_required
  def template_tag_index(request):
      if not utils.docutils_is_available:
          return missing_docutils_page(request)
  
      load_all_installed_template_libraries()
  
      tags = []
      app_libs = list(six.iteritems(template.libraries))
      builtin_libs = [(None, lib) for lib in template.builtins]
      for module_name, library in builtin_libs + app_libs:
          for tag_name, tag_func in library.tags.items():
              title, body, metadata = utils.parse_docstring(tag_func.__doc__)
              if title:
                  title = utils.parse_rst(title, 'tag', _('tag:') + tag_name)
              if body:
                  body = utils.parse_rst(body, 'tag', _('tag:') + tag_name)
              for key in metadata:
                  metadata[key] = utils.parse_rst(metadata[key], 'tag', _('tag:') + tag_name)
              if library in template.builtins:
                  tag_library = ''
              else:
                  tag_library = module_name.split('.')[-1]
              tags.append({
                  'name': tag_name,
                  'title': title,
                  'body': body,
                  'meta': metadata,
                  'library': tag_library,
              })
      return render_to_response('admin_doc/template_tag_index.html', {
          'root_path': urlresolvers.reverse('admin:index'),
          'tags': tags
      }, context_instance=RequestContext(request))
  
  @staff_member_required
  def template_filter_index(request):
      if not utils.docutils_is_available:
          return missing_docutils_page(request)
  
      load_all_installed_template_libraries()
  
      filters = []
      app_libs = list(six.iteritems(template.libraries))
      builtin_libs = [(None, lib) for lib in template.builtins]
      for module_name, library in builtin_libs + app_libs:
          for filter_name, filter_func in library.filters.items():
              title, body, metadata = utils.parse_docstring(filter_func.__doc__)
              if title:
                  title = utils.parse_rst(title, 'filter', _('filter:') + filter_name)
              if body:
                  body = utils.parse_rst(body, 'filter', _('filter:') + filter_name)
              for key in metadata:
                  metadata[key] = utils.parse_rst(metadata[key], 'filter', _('filter:') + filter_name)
              if library in template.builtins:
                  tag_library = ''
              else:
                  tag_library = module_name.split('.')[-1]
              filters.append({
                  'name': filter_name,
                  'title': title,
                  'body': body,
                  'meta': metadata,
                  'library': tag_library,
              })
      return render_to_response('admin_doc/template_filter_index.html', {
          'root_path': urlresolvers.reverse('admin:index'),
          'filters': filters
      }, context_instance=RequestContext(request))
  
  @staff_member_required
  def view_index(request):
      if not utils.docutils_is_available:
          return missing_docutils_page(request)
  
      if settings.ADMIN_FOR:
          settings_modules = [import_module(m) for m in settings.ADMIN_FOR]
      else:
          settings_modules = [settings]
  
      views = []
      for settings_mod in settings_modules:
          urlconf = import_module(settings_mod.ROOT_URLCONF)
          view_functions = extract_views_from_urlpatterns(urlconf.urlpatterns)
          if Site._meta.installed:
              site_obj = Site.objects.get(pk=settings_mod.SITE_ID)
          else:
              site_obj = GenericSite()
          for (func, regex) in view_functions:
              views.append({
                  'full_name': '%s.%s' % (func.__module__, getattr(func, '__name__', func.__class__.__name__)),
                  'site_id': settings_mod.SITE_ID,
                  'site': site_obj,
                  'url': simplify_regex(regex),
              })
      return render_to_response('admin_doc/view_index.html', {
          'root_path': urlresolvers.reverse('admin:index'),
          'views': views
      }, context_instance=RequestContext(request))
  
  @staff_member_required
  def view_detail(request, view):
      if not utils.docutils_is_available:
          return missing_docutils_page(request)
  
      mod, func = urlresolvers.get_mod_func(view)
      try:
          view_func = getattr(import_module(mod), func)
      except (ImportError, AttributeError):
          raise Http404
      title, body, metadata = utils.parse_docstring(view_func.__doc__)
      if title:
          title = utils.parse_rst(title, 'view', _('view:') + view)
      if body:
          body = utils.parse_rst(body, 'view', _('view:') + view)
      for key in metadata:
          metadata[key] = utils.parse_rst(metadata[key], 'model', _('view:') + view)
      return render_to_response('admin_doc/view_detail.html', {
          'root_path': urlresolvers.reverse('admin:index'),
          'name': view,
          'summary': title,
          'body': body,
          'meta': metadata,
      }, context_instance=RequestContext(request))
  
  @staff_member_required
  def model_index(request):
      if not utils.docutils_is_available:
          return missing_docutils_page(request)
      m_list = [m._meta for m in models.get_models()]
      return render_to_response('admin_doc/model_index.html', {
          'root_path': urlresolvers.reverse('admin:index'),
          'models': m_list
      }, context_instance=RequestContext(request))
  
  @staff_member_required
  def model_detail(request, app_label, model_name):
      if not utils.docutils_is_available:
          return missing_docutils_page(request)
  
      # Get the model class.
      try:
          app_mod = models.get_app(app_label)
      except ImproperlyConfigured:
          raise Http404(_("App %r not found") % app_label)
      model = None
      for m in models.get_models(app_mod):
          if m._meta.model_name == model_name:
              model = m
              break
      if model is None:
          raise Http404(_("Model %(model_name)r not found in app %(app_label)r") % {'model_name': model_name, 'app_label': app_label})
  
      opts = model._meta
  
      # Gather fields/field descriptions.
      fields = []
      for field in opts.fields:
          # ForeignKey is a special case since the field will actually be a
          # descriptor that returns the other object
          if isinstance(field, models.ForeignKey):
              data_type = field.rel.to.__name__
              app_label = field.rel.to._meta.app_label
              verbose = utils.parse_rst(
                  (_("the related `%(app_label)s.%(data_type)s` object") % {
                      'app_label': app_label, 'data_type': data_type,
                  }),
                  'model',
                  _('model:') + data_type,
              )
          else:
              data_type = get_readable_field_data_type(field)
              verbose = field.verbose_name
          fields.append({
              'name': field.name,
              'data_type': data_type,
              'verbose': verbose,
              'help_text': field.help_text,
          })
  
      # Gather many-to-many fields.
      for field in opts.many_to_many:
          data_type = field.rel.to.__name__
          app_label = field.rel.to._meta.app_label
          verbose = _("related `%(app_label)s.%(object_name)s` objects") % {'app_label': app_label, 'object_name': data_type}
          fields.append({
              'name': "%s.all" % field.name,
              "data_type": 'List',
              'verbose': utils.parse_rst(_("all %s") % verbose, 'model', _('model:') + opts.model_name),
          })
          fields.append({
              'name': "%s.count" % field.name,
              'data_type': 'Integer',
              'verbose': utils.parse_rst(_("number of %s") % verbose, 'model', _('model:') + opts.model_name),
          })
  
      # Gather model methods.
      for func_name, func in model.__dict__.items():
          if (inspect.isfunction(func) and len(inspect.getargspec(func)[0]) == 1):
              try:
                  for exclude in MODEL_METHODS_EXCLUDE:
                      if func_name.startswith(exclude):
                          raise StopIteration
              except StopIteration:
                  continue
              verbose = func.__doc__
              if verbose:
                  verbose = utils.parse_rst(utils.trim_docstring(verbose), 'model', _('model:') + opts.model_name)
              fields.append({
                  'name': func_name,
                  'data_type': get_return_data_type(func_name),
                  'verbose': verbose,
              })
  
      # Gather related objects
      for rel in opts.get_all_related_objects() + opts.get_all_related_many_to_many_objects():
          verbose = _("related `%(app_label)s.%(object_name)s` objects") % {'app_label': rel.opts.app_label, 'object_name': rel.opts.object_name}
          accessor = rel.get_accessor_name()
          fields.append({
              'name': "%s.all" % accessor,
              'data_type': 'List',
              'verbose': utils.parse_rst(_("all %s") % verbose, 'model', _('model:') + opts.model_name),
          })
          fields.append({
              'name': "%s.count" % accessor,
              'data_type': 'Integer',
              'verbose': utils.parse_rst(_("number of %s") % verbose, 'model', _('model:') + opts.model_name),
          })
      return render_to_response('admin_doc/model_detail.html', {
          'root_path': urlresolvers.reverse('admin:index'),
          'name': '%s.%s' % (opts.app_label, opts.object_name),
          # Translators: %s is an object type name
          'summary': _("Attributes on %s objects") % opts.object_name,
          'description': model.__doc__,
          'fields': fields,
      }, context_instance=RequestContext(request))
  
  @staff_member_required
  def template_detail(request, template):
      templates = []
      for site_settings_module in settings.ADMIN_FOR:
          settings_mod = import_module(site_settings_module)
          if Site._meta.installed:
              site_obj = Site.objects.get(pk=settings_mod.SITE_ID)
          else:
              site_obj = GenericSite()
          for dir in settings_mod.TEMPLATE_DIRS:
              template_file = os.path.join(dir, template)
              templates.append({
                  'file': template_file,
                  'exists': os.path.exists(template_file),
                  'contents': lambda: open(template_file).read() if os.path.exists(template_file) else '',
                  'site_id': settings_mod.SITE_ID,
                  'site': site_obj,
                  'order': list(settings_mod.TEMPLATE_DIRS).index(dir),
              })
      return render_to_response('admin_doc/template_detail.html', {
          'root_path': urlresolvers.reverse('admin:index'),
          'name': template,
          'templates': templates,
      }, context_instance=RequestContext(request))
  
  ####################
  # Helper functions #
  ####################
  
  def missing_docutils_page(request):
      """Display an error message for people without docutils"""
      return render_to_response('admin_doc/missing_docutils.html')
  
  def load_all_installed_template_libraries():
      # Load/register all template tag libraries from installed apps.
      for module_name in template.get_templatetags_modules():
          mod = import_module(module_name)
          try:
              libraries = [
                  os.path.splitext(p)[0]
                  for p in os.listdir(os.path.dirname(upath(mod.__file__)))
                  if p.endswith('.py') and p[0].isalpha()
              ]
          except OSError:
              libraries = []
          for library_name in libraries:
              try:
                  template.get_library(library_name)
              except template.InvalidTemplateLibrary:
                  pass
  
  def get_return_data_type(func_name):
      """Return a somewhat-helpful data type given a function name"""
      if func_name.startswith('get_'):
          if func_name.endswith('_list'):
              return 'List'
          elif func_name.endswith('_count'):
              return 'Integer'
      return ''
  
  def get_readable_field_data_type(field):
      """Returns the description for a given field type, if it exists,
      Fields' descriptions can contain format strings, which will be interpolated
      against the values of field.__dict__ before being output."""
  
      return field.description % field.__dict__
  
  def extract_views_from_urlpatterns(urlpatterns, base=''):
      """
      Return a list of views from a list of urlpatterns.
  
      Each object in the returned list is a two-tuple: (view_func, regex)
      """
      views = []
      for p in urlpatterns:
          if hasattr(p, 'url_patterns'):
              try:
                  patterns = p.url_patterns
              except ImportError:
                  continue
              views.extend(extract_views_from_urlpatterns(patterns, base + p.regex.pattern))
          elif hasattr(p, 'callback'):
              try:
                  views.append((p.callback, base + p.regex.pattern))
              except ViewDoesNotExist:
                  continue
          else:
              raise TypeError(_("%s does not appear to be a urlpattern object") % p)
      return views
  
  named_group_matcher = re.compile(r'\(\?P(<\w+>).+?\)')
  non_named_group_matcher = re.compile(r'\(.*?\)')
  
  def simplify_regex(pattern):
      """
      Clean up urlpattern regexes into something somewhat readable by Mere Humans:
      turns something like "^(?P<sport_slug>\w+)/athletes/(?P<athlete_slug>\w+)/$"
      into "<sport_slug>/athletes/<athlete_slug>/"
      """
      # handle named groups first
      pattern = named_group_matcher.sub(lambda m: m.group(1), pattern)
  
      # handle non-named groups
      pattern = non_named_group_matcher.sub("<var>", pattern)
  
      # clean up any outstanding regex-y characters.
      pattern = pattern.replace('^', '').replace('$', '').replace('?', '').replace('//', '/').replace('\\', '')
      if not pattern.startswith('/'):
          pattern = '/' + pattern
      return pattern
  