view mercurial/stack.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.

# stack.py - Mercurial functions for stack definition
#
#  Copyright Olivia Mackall <[e-mail]> and other
#
# 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


def getstack(repo, rev=None):
    """return a sorted smartrev of the stack containing either rev if it is
    not None or the current working directory parent.

    The stack will always contain all drafts changesets which are ancestors to
    the revision and are not merges.
    """
    if rev is None:
        rev = b'.'

    revspec = b'only(%s) and not public() and not ::merge()'
    revisions = repo.revs(revspec, rev)
    revisions.sort()
    return revisions