view mercurial/txnutil.py @ 44008:ac72e17457e5

fix: correct the clang-format example hgrc so that it actually works

There are three changes here:

*   Remove -i from `command`, it causes fix to eat your file and empty it out
*   Add `set:` to pattern, otherwise this is interpreted as just a glob
*   Switch `listfile:` to `include:`; `listfile:` is relative to the current
    working directory, while `include:` is relative to the repo root. This makes
    it so that you don't receive errors when running outside of the repo root
    about being unable to find the file.

Differential Revision: https://phab.mercurial-scm.org/D7618

# txnutil.py - transaction related utilities
#
#  Copyright FUJIWARA Katsunori <[e-mail]> 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(b'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(b'%s.pending' % filename, **kwargs), True)
        except IOError as inst:
            if inst.errno != errno.ENOENT:
                raise
    return (vfs(filename, **kwargs), False)