templater: keep default resources per template engine (API)
This allows us to register a repo object as a resource in hgweb template,
without loosing '{repo}' symbol:
symbol('repo') -> mapping['repo'] (n/a) -> defaults['repo']
resource('repo') -> mapping['repo'] (n/a) -> resources['repo']
I'm thinking of redesigning the templatekw API to take (context, mapping)
in place of **(context._resources + mapping), but that will be a big change
and not implemented yet.
props['templ'] is ported to the resources dict as an example.
.. api::
mapping does not contain all template resources. use context.resource()
in template functions.
# txnutil.py - transaction related utilities
#
# Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
import errno
from . import (
encoding,
)
def mayhavepending(root):
'''return whether 'root' may have pending changes, which are
visible to this process.
'''
return root == encoding.environ.get('HG_PENDING')
def trypending(root, vfs, filename, **kwargs):
'''Open file to be read according to HG_PENDING environment variable
This opens '.pending' of specified 'filename' only when HG_PENDING
is equal to 'root'.
This returns '(fp, is_pending_opened)' tuple.
'''
if mayhavepending(root):
try:
return (vfs('%s.pending' % filename, **kwargs), True)
except IOError as inst:
if inst.errno != errno.ENOENT:
raise
return (vfs(filename, **kwargs), False)