make appendfile simpler so it does not break with revlogng on windows. it used to cache open files. this made revlogng break because it wants to rename files when splitting .i into .i/.d, but cannot rename or unlink open files on windows. new code is bit slower, but safe on linux and windows. proper fix for too many open/close of changelog/manifest belongs in different place. can get 10% speed improvement back.

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"""

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node.py - basic nodeid manipulation for mercurial

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Copyright 2005 Matt Mackall <mpm@selenic.com>

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This software may be used and distributed according to the terms

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of the GNU General Public License, incorporated herein by reference.

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"""

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import binascii

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nullid = "\0" * 20

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def hex(node):

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    return binascii.hexlify(node)

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def bin(node):

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    return binascii.unhexlify(node)

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def short(node):

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    return hex(node[:6])