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Released 2014-06-06, codename "tap tap tap"
- Added support for opening stdin/stdout on Windows in binary mode
correctly.
- Added support for atomic writes to files by going through a
temporary file.
- Introduced :exc:`BadParameter` which can be used to easily perform
custom validation with the same error messages as in the type
system.
- Added :func:`progressbar`; a function to show progress bars.
- Added :func:`get_app_dir`; a function to calculate the home folder
for configs.
- Added transparent handling for ANSI codes into the :func:`echo`
function through ``colorama``.
- Added :func:`clear` function.
- Breaking change: parameter callbacks now get the parameter object
passed as second argument. There is legacy support for old callbacks
which will warn but still execute the script.
- Added :func:`style`, :func:`unstyle` and :func:`secho` for ANSI
styles.
- Added an :func:`edit` function that invokes the default editor.
- Added an :func:`launch` function that launches browsers and
applications.
- Nargs of -1 for arguments can now be forced to be a single item
through the required flag. It defaults to not required.
- Setting a default for arguments now implicitly makes it non
required.
- Changed "yN" / "Yn" to "y/N" and "Y/n" in confirmation prompts.
- Added basic support for bash completion.
- Added :func:`getchar` to fetch a single character from the terminal.
- Errors now go to stderr as intended.
- Fixed various issues with more exotic parameter formats like
DOS/Windows style arguments.
- Added :func:`pause` which works similar to the Windows ``pause`` cmd
built-in but becomes an automatic noop if the application is not run
through a terminal.
- Added a bit of extra information about missing choice parameters.
- Changed how the help function is implemented to allow global
overriding of the help option.
- Added support for token normalization to implement case insensitive
handling.
- Added support for providing defaults for context settings.