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view mercurial/node.py @ 20178:74aea4be8e78

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perf: add perfmoonwalk command to walk the changelog backwards This lets us test the effectiveness (or ineffectiveness) of the revlog chunk cache when walking revlogs backwards.
author Brodie Rao <brodie@sf.io>
date Sun, 17 Nov 2013 18:04:28 -0500
parents 25e572394f5c
children 1a5211f2f87f
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# node.py - basic nodeid manipulation for mercurial
#
# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import binascii

nullrev = -1
nullid = "\0" * 20

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

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