Mercurial > hg
view mercurial/txnutil.py @ 45358:452ece5654c5
hg-core: remove the `Operation` trait
There is no way to currently define a trait which can both return references
to `self` and to passed data, which is what we would need.
Generic Associated Types may fix this and allow us to have a unified interface.
See: rust #44265
Differential Revision: https://phab.mercurial-scm.org/D8862
author | Antoine Cezar <antoine.cezar@octobus.net> |
---|---|
date | Wed, 29 Jul 2020 10:08:09 +0200 |
parents | 687b865b95ad |
children | 89a2afe31e82 |
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# 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(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)