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import os
import pkg_resources
from zope.component import queryUtility
from zope.component import getSiteManager
from repoze.bfg.interfaces import ITemplateRenderer
from repoze.bfg.path import caller_package
from repoze.bfg.settings import get_settings
def renderer_from_cache(path, factory, level=3, **kw):
if os.path.isabs(path):
# 'path' is an absolute filename (not common and largely only
# for backwards compatibility)
if not os.path.exists(path):
raise ValueError('Missing template file: %s' % path)
renderer = queryUtility(ITemplateRenderer, name=path)
if renderer is None:
renderer = factory(path, **kw)
sm = getSiteManager()
sm.registerUtility(renderer, ITemplateRenderer, name=path)
else:
# 'path' is a relative filename
package = caller_package(level=level)
spec = (package.__name__, path)
utility_name = '%s:%s' % spec # utility name must be a string
renderer = queryUtility(ITemplateRenderer, name=utility_name)
if renderer is None:
# service unit tests here by trying the relative path
# string as the utility name directly
renderer = queryUtility(ITemplateRenderer, name=path)
if renderer is None:
if not pkg_resources.resource_exists(*spec):
raise ValueError('Missing template resource: %s' % utility_name)
abspath = pkg_resources.resource_filename(*spec)
renderer = factory(abspath, **kw)
settings = get_settings()
if (not settings) or (not settings.get('reload_resources')):
# cache the template
sm = getSiteManager()
sm.registerUtility(renderer, ITemplateRenderer,
name=utility_name)
return renderer
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