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#!/usr/bin/python
#----------------------------------------------------
# Version:    0.2.1
# Author:   Florian "Bluewind" Pritz <f-p@gmx.at>
#
# Licensed under WTFPL v2
# (see COPYING for full license text)
#
#----------------------------------------------------
# got bored and a.sh has some problems with spaces
#----------------------------------------------------

import sys
import os
from optparse import OptionParser
from subprocess import Popen, PIPE

def main():
  usage = "usage: %prog [options] <files>"
  p = OptionParser(usage)
  p.add_option("-f", "--file", dest="tarname", default=False,
      help="use <file>.tar.gz instead of $1.tar.gz", metavar="<file>")
  p.add_option("--force", action="store_true", dest="force", default=False,
      help="overwrite existing target files")
  p.add_option("-b", "--bzip2", action="store_true", dest="bz2", default=False,
      help="use bzip2 compression")
  p.add_option("-u", "--uncompressed", action="store_true", dest="uncompressed", default=False,
      help="don't use compression at all")
  p.add_option("-x", "--xz", action="store_true", dest="xz", default=False,
      help="use xz compression")

  (options, args) = p.parse_args()


  if len(sys.argv) == 1:
    p.print_help()
    sys.exit()

  if options.tarname:
    tarname = options.tarname
  else:
    tarname = args[0]+".tar"
  tarcmd = ['bsdtar', '-c']

  if options.bz2:
    tarname += ".bz2"
    tarcmd.extend(['-jf', tarname])
  elif options.uncompressed:
    tarcmd.extend(['-f', tarname])
  elif options.xz:
    tarname += ".xz"
    tarcmd.extend(['-Jf', tarname])
  else:
    tarname += ".gz"
    tarcmd.extend(['-zf', tarname])

  if not options.force:
    file_exists(tarname)
  Popen(merge([tarcmd, args]), stdout=PIPE).communicate()[0]

def merge(seq):
    merged = []
    for s in seq:
        for x in s:
            merged.append(x)
    return merged

def file_exists(filename):
    if os.path.exists(filename):
        sys.stderr.write('Target "'+filename+'" already exists. Use --force to overwrite.\n')
        sys.exit(1)

if __name__ == '__main__':
  main()