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# Copyright (C) 2005 by Intevation GmbH

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# Author(s):

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# Thomas Arendsen Hein <thomas@intevation.de>

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#

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# This program is free software under the GNU GPL (>=v2)

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# Read the file COPYING coming with the software for details.

     7

     8

"""

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Mercurial version

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"""

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import os

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import os.path

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import re

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import time

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import util

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unknown_version = 'unknown'

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remembered_version = False

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def get_version():

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    """Return version information if available."""

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    try:

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        from mercurial.__version__ import version

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    except ImportError:

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        version = unknown_version

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    return version

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def write_version(version):

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    """Overwrite version file."""

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    filename = os.path.join(os.path.dirname(__file__), '__version__.py')

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    f = open(filename, 'w')

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    f.write("# This file is auto-generated.\n")

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    f.write("version = %r\n" % version)

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    f.close()

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def remember_version(version=None):

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    """Store version information."""

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    global remembered_version

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    if not version and os.path.isdir(".hg"):

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        f = os.popen("hg identify 2> %s" % util.nulldev)  # use real hg installation

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        ident = f.read()[:-1]

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        if not f.close() and ident:

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            ids = ident.split(' ', 1)

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            version = ids.pop(0)

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            if version[-1] == '+':

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                version = version[:-1]

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                modified = True

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            else:

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                modified = False

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            if version.isalnum() and ids:

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                for tag in ids[0].split('/'):

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                    # is a tag is suitable as a version number?

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                    if re.match(r'^(\d+\.)+[\w.-]+$', tag):

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                        version = tag

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                        break

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            if modified:

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                version += time.strftime('+%Y%m%d')

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    if version:

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        remembered_version = True

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        write_version(version)

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    63

def forget_version():

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    """Remove version information."""

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    if remembered_version:

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        write_version(unknown_version)

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