Mercurial > hg
view mercurial/txnutil.py @ 49487:e8481625c582
rust: add Debug constraint to Matcher trait
This makes sure we can easily debug which Matcher we're looking at when using
trait objects, and is just generally useful. Effort to make the debugging
output nicer has been kept to a minimum, please feel free to improve.
author | Raphaël Gomès <rgomes@octobus.net> |
---|---|
date | Mon, 11 Jul 2022 11:59:13 +0200 |
parents | 2e726c934fcd |
children | f4733654f144 |
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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 . 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 FileNotFoundError: pass return (vfs(filename, **kwargs), False)