# ext/autohandler.py
# Copyright 2006-2025 the Mako authors and contributors <see AUTHORS file>
#
# This module is part of Mako and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""adds autohandler functionality to Mako templates.
requires that the TemplateLookup class is used with templates.
usage::
<%!
from mako.ext.autohandler import autohandler
%>
<%inherit file="${autohandler(template, context)}"/>
or with custom autohandler filename::
<%!
from mako.ext.autohandler import autohandler
%>
<%inherit file="${autohandler(template, context, name='somefilename')}"/>
"""
import os
import posixpath
import re
def autohandler(template, context, name="autohandler"):
lookup = context.lookup
_template_uri = template.module._template_uri
if not lookup.filesystem_checks:
try:
return lookup._uri_cache[(autohandler, _template_uri, name)]
except KeyError:
pass
tokens = re.findall(r"([^/]+)", posixpath.dirname(_template_uri)) + [name]
while len(tokens):
path = "/" + "/".join(tokens)
if path != _template_uri and _file_exists(lookup, path):
if not lookup.filesystem_checks:
return lookup._uri_cache.setdefault(
(autohandler, _template_uri, name), path
)
else:
return path
if len(tokens) == 1:
break
tokens[-2:] = [name]
if not lookup.filesystem_checks:
return lookup._uri_cache.setdefault(
(autohandler, _template_uri, name), None
)
else:
return None
def _file_exists(lookup, path):
psub = re.sub(r"^/", "", path)
for d in lookup.directories:
if os.path.exists(d + "/" + psub):
return True
else:
return False
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