updaterevision.py

#
#	Copyright 2014 Teemu Piippo
#	All rights reserved.
#
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#	   this software without specific prior written permission.
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#	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
#	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
#	TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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#	PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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import sys
import subprocess
from datetime import datetime

if len (sys.argv) != 2:
    print 'usage: %s <output>' % sys.argv[0]
    quit (1)

oldrev = ''

try:
    with open (sys.argv[1]) as fp:
        oldrev = fp.readline().replace ('\n', '').replace ('// ', '')
except IOError:
    pass

data = subprocess.check_output (['hg', 'log', '-r.', '--template',
    '{node|short} {branch} {date|hgdate}']).replace ('\n', '').split (' ')

rev = data[0]
branch = data[1]
timestamp = int (data[2])
date = datetime.utcfromtimestamp (timestamp)
datestring = date.strftime ('%y%m%d-%H%M') if date.year >= 2000 else '000000-0000'

if len(rev) > 7:
    rev = rev[0:7]

if subprocess.check_output (['hg', 'id', '-n']).replace ('\n', '')[-1] == '+':
    rev += '+'

if rev == oldrev:
    print "%s is up to date at %s" % (sys.argv[1], rev)
    quit (0)

with open (sys.argv[1], 'w') as fp:
    fp.write ('// %s\n' % rev)
    fp.write ('#define HG_NODE "%s"\n' % rev)
    fp.write ('#define HG_BRANCH "%s"\n' % branch)
    fp.write ('#define HG_DATE_VERSION "%s"\n' % datestring)
    fp.write ('#define HG_DATE_STRING "%s"\n' % date.strftime ('%d %b %Y'))
    fp.write ('#define HG_DATE_TIME %d\n' % int (timestamp))
    print '%s updated to %s' % (sys.argv[1], rev)