Click

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Released 2015-11-24, codename "pow pow"

- Optimized the progressbar rendering to not render when it did not
actually change.
- Explicitly disallow ``nargs=-1`` with a set default.
- The context is now closed before it's popped from the stack.
- Added support for short aliases for the false flag on toggles.
- Click will now attempt to aid you with debugging locale errors
better by listing with the help of the OS what locales are
available.
- Click used to return byte strings on Python 2 in some unit-testing
situations. This has been fixed to correctly return unicode strings
now.
- For Windows users on Python 2, Click will now handle Unicode more
correctly handle Unicode coming in from the system. This also has
the disappointing side effect that filenames will now be always
unicode by default in the ``Path`` type which means that this can
introduce small bugs for code not aware of this.
- Added a ``type`` parameter to ``Path`` to force a specific string
type on the value.
- For users running Python on Windows the ``echo`` and ``prompt``
functions now work with full unicode functionality in the Python
windows console by emulating an output stream. This also applies to
getting the virtual output and input streams via
``click.get_text_stream(...)``.
- Unittests now always force a certain virtual terminal width.
- Added support for allowing dashes to indicate standard streams to
the ``Path`` type.
- Multi commands in chain mode no longer propagate arguments left over
from parsing to the callbacks. It's also now disallowed through an
exception when optional arguments are attached to multi commands if
chain mode is enabled.
- Relaxed restriction that disallowed chained commands to have other
chained commands as child commands.
- Arguments with positive nargs can now have defaults implemented.
Previously this configuration would often result in slightly
unexpected values be returned.

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Released 2015-08-17

- Fix a bug in ``pass_obj`` that would accidentally pass the context
too.

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Released 2015-08-16, codename "tok tok"

- Removed various deprecated functionality.
- Atomic files now only accept the ``w`` mode.
- Change the usage part of help output for very long commands to wrap
their arguments onto the next line, indented by 4 spaces.
- Fix a bug where return code and error messages were incorrect when
using ``CliRunner``.
- Added ``get_current_context``.
- Added a ``meta`` dictionary to the context which is shared across
the linked list of contexts to allow click utilities to place state
there.
- Introduced ``Context.scope``.
- The ``echo`` function is now threadsafe: It calls the ``write``
method of the underlying object only once.
- ``prompt(hide_input=True)`` now prints a newline on ``^C``.
- Click will now warn if users are using ``unicode_literals``.
- Click will now ignore the ``PAGER`` environment variable if it is
empty or contains only whitespace.
- The ``click-contrib`` GitHub organization was created.

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Released 2015-07-14

- Fix a bug where error messages would include a trailing ``None``
string.
- Fix a bug where Click would crash on docstrings with trailing
newlines.
- Support streams with encoding set to ``None`` on Python 3 by barfing
with a better error.
- Handle ^C in less-pager properly.
- Handle return value of ``None`` from ``sys.getfilesystemencoding``
- Fix crash when writing to unicode files with ``click.echo``.
- Fix type inference with multiple options.

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Released 2015-03-31, codename "zoom zoom"

- Added ``color`` parameters to lots of interfaces that directly or
indirectly call into echoing. This previously was always
autodetection (with the exception of the ``echo_via_pager``
function). Now you can forcefully enable or disable it, overriding
the auto detection of Click.
- Added an ``UNPROCESSED`` type which does not perform any type
changes which simplifies text handling on 2.x / 3.x in some special
advanced usecases.
- Added ``NoSuchOption`` and ``BadOptionUsage`` exceptions for more
generic handling of errors.
- Added support for handling of unprocessed options which can be
useful in situations where arguments are forwarded to underlying
tools.
- Added ``max_content_width`` parameter to the context which can be
used to change the maximum width of help output. By default Click
will not format content for more than 80 characters width.
- Added support for writing prompts to stderr.
- Fix a bug when showing the default for multiple arguments.
- Added support for custom subclasses to ``option`` and ``argument``.
- Fix bug in ``clear()`` on Windows when colorama is installed.
- Reject ``nargs=-1`` for options properly. Options cannot be
variadic.
- Fixed an issue with bash completion not working properly for
commands with non ASCII characters or dashes.
- Added a way to manually update the progressbar.
- Changed the formatting of missing arguments. Previously the internal
argument name was shown in error messages, now the metavar is shown
if passed. In case an automated metavar is selected, it's stripped
of extra formatting first.

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Released 2014-09-08

- Fixed an issue with error reporting on Python 3 for invalid
forwarding of commands.