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−# node.py - basic nodeid manipulation for mercurial
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−#
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−# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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−#
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−# This software may be used and distributed according to the terms of the
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−# GNU General Public License version 2 or any later version.
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−
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−from __future__ import absolute_import
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−
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−import binascii
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−
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−# This ugly style has a noticeable effect in manifest parsing
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−hex = binascii.hexlify
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−bin = binascii.unhexlify
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−
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−nullrev = -1
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−nullid = b"\0" * 20
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−nullhex = hex(nullid)
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−
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−# Phony node value to stand-in for new files in some uses of
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−# manifests.
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−newnodeid = '!' * 20
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−addednodeid = ('0' * 15) + 'added'
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−modifiednodeid = ('0' * 12) + 'modified'
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−
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−wdirnodes = set((newnodeid, addednodeid, modifiednodeid))
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−
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−# pseudo identifiers for working directory
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−# (they are experimental, so don't add too many dependencies on them)
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−wdirrev = 0x7fffffff
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−wdirid = b"\xff" * 20
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−
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−def short(node):
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−    return hex(node[:6])