Mercurial > hg
view mercurial/txnutil.py @ 52037:0ea323b7e3b1
rust-manifest: encode flags as `Option<NonZeroU8>`
This makes the compiler use the niche optimization for all flags: since 0 is
not a valid representation of any flags, we can use 0 as a replacement for
`None`, which reduces memory footprint and could yield a little performance
improvement over many iterations.
author | Raphaël Gomès <rgomes@octobus.net> |
---|---|
date | Mon, 30 Sep 2024 12:08:49 +0200 |
parents | f4733654f144 |
children |
line wrap: on
line source
# 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 annotations 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)