view mercurial/node.py @ 28494:63653147e9bb

changelog: parse description last

Before, we first searched for the double newline as the first step in
the parse then moved to the front of the string and worked our way
to the back again. This made sense when we were splitting the raw
text on the double newline. But in our new newline scanning based
approach, this feels awkward.

This patch updates the parsing logic to parse the text linearly and
deal with the description field last.

Because we're avoiding an extra string scan, revsets appear to
demonstrate a very slight performance win. But the percentage
change is marginal, so the numbers aren't worth reporting.

# node.py - basic nodeid manipulation for mercurial
#
# Copyright 2005, 2006 Matt Mackall <[e-mail]>
#
# 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 binascii

# This ugly style has a noticeable effect in manifest parsing
hex = binascii.hexlify
bin = binascii.unhexlify

nullrev = -1
nullid = "\0" * 20
nullhex = hex(nullid)

# pseudo identifiers for working directory
# (they are experimental, so don't add too many dependencies on them)
wdirrev = 0x7fffffff
wdirid = "\xff" * 20

def short(node):
    return hex(node[:6])