#! /usr/bin/env python
# ______________________________________________________________________
#
# Filename: cvs_latest_version
#
# Created: 20-JAN-2001,   Harry Melanson
#
# ______________________________________________________________________

"""Determine latest tag of a CVS package.

USAGE:

  cvs_latest_version [-hv] package

OPTIONS:

  -h, --help  --  Print help text and exit.

  -p=pxx-br   --  List latest version on specified production branch.

Assumes packages are tagged with the following style: vxx-xx-xx.
Ignores all other tags.

Uses the command: cvs history -Ta

"""

# ______________________________________________________________________

import sys, os
import glob
import string

# ______________________________________________________________________

__author__ = 'Harry Melanson, melanson@fnal.gov'
__version__ = '00.00.00'
__filename__ = 'memstats'
__doc__ = __doc__ % vars()

# ______________________________________________________________________


def process_command():
    """Process the command."""

    from scriptutil import getOptions
    optlist, args = getOptions('p:', [], __doc__)

    #  Process command line arguments
    
    if len(args) == 0:
	print "\nERROR: No CVS package specified."
        print "\nNAME: ", (os.path.basename(sys.argv[0]))
        print  __doc__
	sys.exit(-1)

    FLAG = 'A'                 #  Default flag - 'active tag'

    for opt in optlist:
	if opt.flag == '-p':
	    FLAG = opt.value   # Look for latest version on a production branch

    PACKAGE = args[0]
    command = 'cvs history -Ta | grep " ' + PACKAGE + ' "'

    #  Issue cvs history command and get latest active version
    
    result = None
    for line in os.popen(command, 'r').readlines():
	items = string.split(line)
	if len(items) != 7:
	    print "WARNING: Format of cvs history has changed."
	    print "         Returned following line:"
	    print "\n", string.join(items)
	    sys.exit()
	else:
	    version = items[6]
	    if (string.find(version, ':' + FLAG) != -1):    # Select latest version
		result = line

    #  Report results
    
    if (result != None):
	items = string.split(result)
	package = items[5]
	version = string.split(string.split(result, FLAG)[0],'[')[-1][:-1]
	developer = items[4]
	date = items[1]
	time = items[2]
	if (package == PACKAGE):
	    if FLAG == 'A':
		print "\nLatest tagged version of " + package + " on development branch: " + version + \
		      " (" + developer + ", " + date + ", " + time + ")\n"
		sys.exit()
	    else:
		print "\nLatest tagged version of " + package + " on " + FLAG + ": " + version + \
		      " (" + developer + ", " + date + ", " + time + ")\n"
		sys.exit()
	else:
	    print "WARNING: Different package encountered."
	    print "         Returned following line:"
	    print "\n", string.join(items)
	    sys.exit()
		
    else:
	print "WARNING: This package is either not in CVS or it has not yet been tagged."
    
# ______________________________________________________________________
#
#  Execute command


if __name__ == '__main__':
    process_command()
    sys.exit(0)