Development with the patoolib library
======================================

The patool funtionality can also be used in other Python programs.
To do this, install the patool program, import the library and
use one or more of the convenience functions.

import patoolib
if patoolib.extract("myarchive.zip", verbose=True) == 0:
    print "Success."
else:
    print "Error."

General rules for all convenience functions:

* All convenience function return zero when no error occurred, else
  an integer unequal zero.

* Error messages are printed on stderr, informative messages
  are printed on stdout.

* All file arguments are filenames. File objects are not accepted
  as input.

* Filenames can be relative or absolute.

The convenience functions are:

* ``def extract(archive, verbose=False, outdir=None)``
  
  This function extracts the given archive filename to the current
  working directory or if specified to the given directory name in outdir.
  If verbose operation is set to True, additional output of the archive
  program is shown.

* ``def list(archive, verbose=False)``
  
  This function lists the contents of the given archive filename
  on stdout.
  If verbose operation is set to True, additional output of the archive
  program is shown.

* ``def test(archive, verbose=False)``
  
  This function tests the given archive filename.
  If verbose operation is set to True, additional output of the archive
  program is shown.

* ``def create(archive, *filenames, **kwargs)``
  
  This function creates a new archive. The type of archive is determined
  by the archive filename extension. The archive must not already
  exist.
  The list of filenames to add to the archive must not be empty and the
  files must exist and be readable.
  If verbose operation is set to True, additional output of the archive
  program is shown.

* ``def diff(archive1, archive2, verbose=False)``
  
  This function lists differences in the content of the two archives.
  Both archives are extracted and the contents are compared
  recursively with the diff(1) program.
  If verbose operation is set to True, additional output of the archive
  program is shown.

* ``def repack(archive1, archive2, verbose=False)``
  
  This function extracts the contents of archive1 and packs them
  into archive2.
  Archive1 and archive2 must be different files.
  If verbose operation is set to True, additional output of the archive
  program is shown.