printver -- print version and date of python modules

printver.py

#!/usr/bin/env python
# encoding: utf-8
'''
printver -- print version and date of python modules

print module's __version__, __date__ and __updated__ variable

:author:     Liu Xue Yan
:mail:    tanbro@163.com
'''
from __future__ import print_function, absolute_import

import sys
import os

from argparse import ArgumentParser
from argparse import RawDescriptionHelpFormatter

from importlib import import_module

__all__ = []
__version__ = 0.1
__date__ = '2015-01-15'
__updated__ = '2015-01-15'

DEBUG = 0
TESTRUN = 0
PROFILE = 0

class CLIError(Exception):
    '''Generic exception to raise and log different fatal errors.'''
    def __init__(self, msg):
        super(CLIError).__init__(type(self))
        self.msg = "E: %s" % msg
    def __str__(self):
        return self.msg
    def __unicode__(self):
        return self.msg

def main(argv=None):  # IGNORE:C0111
    '''Command line options.'''

    if argv is None:
        argv = sys.argv
    else:
        sys.argv.extend(argv)

    program_name = os.path.basename(sys.argv[0])
    program_version = "v%s" % __version__
    program_build_date = str(__updated__)
    program_version_message = '%%(prog)s %s (%s)' % (program_version, program_build_date)
    program_license = '''printver -- print version and date of python modules

  Created by Liu Xue Yan on %s.

USAGE
''' % (str(__date__))

    try:
        # Setup argument parser
        parser = ArgumentParser(description=program_license, formatter_class=RawDescriptionHelpFormatter)
        parser.add_argument('-V', '--version', action='version', version=program_version_message)
        parser.add_argument('name', type=str, nargs='+',
                            help="Specifies what module to import in absolute or relative terms (e.g. either pkg.mod or ..mod). If the name is specified in relative terms, then the package argument must be set to the name of the package which is to act as the anchor for resolving the package name (e.g. import_module('..mod', 'pkg.subpkg') will import pkg.mod).")

        # Process arguments
        args = parser.parse_args()
    except KeyboardInterrupt:
        ### handle keyboard interrupt ###
        return 0
    except Exception as e:
        if DEBUG or TESTRUN:
            raise(e)
        indent = len(program_name) * " "
        sys.stderr.write(program_name + ": " + repr(e) + "\n")
        sys.stderr.write(indent + "  for help use --help")
        return 2
    #
    modnames = args.name
    for modname in modnames:
        modobj = import_module(modname)
        try:
            version_str = str(modobj.__version__)
        except AttributeError:
            version_str = None
        try:
            updated_str = str(modobj.__updated__)
        except AttributeError:
            updated_str = None
        try:
            date_str = str(modobj.__date__)
        except AttributeError:
            date_str = None
        print('Module<{}>\n  |-version: {}\n  |-date:    {}\n  `-updated: {}\n'.format(modobj.__name__, version_str, date_str, updated_str))

    #
    return 0


if __name__ == "__main__":
    if DEBUG:
        pass
    if TESTRUN:
        import doctest
        doctest.testmod()
    if PROFILE:
        import cProfile
        import pstats
        profile_filename = 'printver_profile.txt'
        cProfile.run('main()', profile_filename)
        statsfile = open("profile_stats.txt", "wb")
        p = pstats.Stats(profile_filename, stream=statsfile)
        stats = p.strip_dirs().sort_stats('cumulative')
        stats.print_stats()
        statsfile.close()
        sys.exit(0)
    sys.exit(main())