#!/usr/bin/env python
#
# by Erik Osheim
#
# This program unboxes various archive 

import os
import shutil
from subprocess import call
import sys
import tempfile

# list each kind of archive in terms of extension, and then program and
# arguments to use. Use None to indicate where the filename should be placed.
handlers = {
    '.zip':     ['unzip', None],
    '.tgz':     ['tar', 'xvzf', None],
    '.tbz':     ['tar', 'xvjf', None],
    '.tar.gz':  ['tar', 'xvzf', None],
    '.tar.bz2': ['tar', 'xvjf', None],
    #'.tar.xz':  ['tar', 'xvJz', None],
}

# program usage
def usage(err=None):
    retval = 0
    if err:
        retval = 1
        print 'error: %s' % err
    print 'usage: unbox ARCHIVE'
    sys.exit(retval)

if __name__ == "__main__":
    args = sys.argv[1:]
    if not args:
        usage()
    elif len(args) > 1:
        usage('too many arguments')
    path = args[0]
    if not os.path.exists(path):
        usage('path %r does not exist' % path)

    cmd = None
    for ext in handlers:
        if path.endswith(ext):
            cmd  = handlers[ext]
            base = path[:-len(ext)]
    if not cmd:
        usage("can't handle path %r" % path)

    d = tempfile.mkdtemp(prefix='unbox-')

    fd, path2 = tempfile.mkstemp(dir=d)
    os.write(fd, open(path, 'rb').read())
    os.close(fd)

    cwd = os.getcwd()
    print d
    os.chdir(d)

    base2 = os.path.basename(path2)

    # put the path into the command
    cmd = [x or base2 for x in cmd]

    retcode = call(cmd)
    if retcode != 0:
        print 'error: %s failed (%d)' % (cmd[0], retcode)
        sys.exit(1)

    os.unlink(path2)

    items = os.listdir(d)
    if len(items) == 1:
        shutil.move(d + '/' + items[0], cwd)
        shutil.rmtree(d)
    else:
        shutil.move(d, cwd + '/' + base)