updaterevision.py

#
#	Copyright 2014 Teemu Piippo
#	All rights reserved.
#
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#	are met:
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#	   notice, this list of conditions and the following disclaimer.
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#	   this software without specific prior written permission.
#
#	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#	TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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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

delim='@'*10
rev, branch, timestampstr, tags = subprocess.check_output (['hg', 'log', '-r.', '--template',
	delim.join (['{node|short}', '{branch}', '{date|hgdate}', '{tags}'])]).replace ('\n', '').split (delim)

timestamp = int (timestampstr.split(' ')[0])
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))

	if tags and tags != 'tip':
		fp.write ('#define HG_TAG "%s"\n' % tags.split(' ')[0])

	print '%s updated to %s' % (sys.argv[1], rev)