Bash-style brace expansion for Python
=====================================

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Implements Brace Expansion as described in
`bash(1) <http://man7.org/linux/man-pages/man1/bash.1.html#EXPANSION>`__,
with the following limitations:

-  A pattern containing unbalanced braces will raise an
   ``UnbalancedBracesError`` exception. In bash, unbalanced braces will
   either be partly expanded or ignored.

-  A mixed-case character range like ``'{Z..a}'`` or ``'{a..Z}'`` will
   not include the characters :literal:`[]^_\`` between ``Z`` and ``a``.

``braceexpand`` is tested with Python 2.7, and 3.5+

Installation
------------

Install the ``braceexpand`` package from pypi:

::

   $ pip install braceexpand

Examples
--------

The ``braceexpand`` function returns an iterator over the expansions
generated from a pattern.

.. code:: python

   >>> from braceexpand import braceexpand

   # Integer range
   >>> list(braceexpand('item{1..3}'))
   ['item1', 'item2', 'item3']

   # Character range
   >>> list(braceexpand('{a..c}'))
   ['a', 'b', 'c']

   # Sequence
   >>> list(braceexpand('index.html{,.backup}'))
   ['index.html', 'index.html.backup']

   # Nested patterns
   >>> list(braceexpand('python{2.{5..7},3.{2,3}}'))
   ['python2.5', 'python2.6', 'python2.7', 'python3.2', 'python3.3']

   # Prefixing an integer with zero causes all numbers to be padded to
   # the same width.
   >>> list(braceexpand('{07..10}'))
   ['07', '08', '09', '10']

   # An optional increment can be specified for ranges.
   >>> list(braceexpand('{a..g..2}'))
   ['a', 'c', 'e', 'g']

   # Ranges can go in both directions.
   >>> list(braceexpand('{4..1}'))
   ['4', '3', '2', '1']

   # Numbers can be negative
   >>> list(braceexpand('{2..-1}'))
   ['2', '1', '0', '-1']

   # Unbalanced braces raise an exception.
   >>> list(braceexpand('{1{2,3}'))
   Traceback (most recent call last):
       ...
   UnbalancedBracesError: Unbalanced braces: '{1{2,3}'

   # By default, the backslash is the escape character.
   >>> list(braceexpand(r'{1\{2,3}'))
   ['1{2', '3']

   # Setting 'escape' to False disables backslash escaping.
   >>> list(braceexpand(r'\{1,2}', escape=False))
   ['\\1', '\\2']

License
-------

braceexpand is licensed unter the MIT License. See the included file
``LICENSE`` for details.

.. |build-status-img| image:: https://travis-ci.org/trendels/braceexpand.svg
   :target: https://travis-ci.org/trendels/braceexpand
