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1089
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1 """
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2 node.py - basic nodeid manipulation for mercurial
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3
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4 Copyright 2005 Matt Mackall <mpm@selenic.com>
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5
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6 This software may be used and distributed according to the terms
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7 of the GNU General Public License, incorporated herein by reference.
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8 """
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9
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10 import sha, binascii
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11
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12 nullid = "\0" * 20
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13
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14 def hex(node):
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15 return binascii.hexlify(node)
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16
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17 def bin(node):
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18 return binascii.unhexlify(node)
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19
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20 def short(node):
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21 return hex(node[:6])
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22
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23 def hash(text, p1, p2):
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24 """generate a hash from the given text and its parent hashes
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25
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26 This hash combines both the current file contents and its history
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27 in a manner that makes it easy to distinguish nodes with the same
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28 content in the revision graph.
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29 """
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30 l = [p1, p2]
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31 l.sort()
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32 s = sha.new(l[0])
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33 s.update(l[1])
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34 s.update(text)
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35 return s.digest()
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36
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