Cmd2

* Bug Fixes
* Fixed ``help`` command not calling functions for help topics
* Fixed not being able to use quoted paths when redirecting with ``<`` and ``>``

* Enhancements
* Tab completion has been overhauled and now supports completion of strings with quotes and spaces.
* Tab completion will automatically add an opening quote if a string with a space is completed.
* Added ``delimiter_complete`` function for tab completing delimited strings
* Added more control over tab completion behavior including the following flags. The use of these flags is documented in cmd2.py
* ``allow_appended_space``
* ``allow_closing_quote``
* Due to the tab completion changes, non-Windows platforms now depend on [wcwidth](https://pypi.python.org/pypi/wcwidth).
* An alias name can now match a command name.
* An alias can now resolve to another alias.

* Attribute Changes (Breaks backward compatibility)
* ``exclude_from_help`` is now called ``hidden_commands`` since these commands are hidden from things other than help, including tab completion
* This list also no longer takes the function names of commands (``do_history``), but instead uses the command names themselves (``history``)
* ``excludeFromHistory`` is now called ``exclude_from_history``
* ``cmd_with_subs_completer()`` no longer takes an argument called ``base``. Adding tab completion to subcommands has been simplified to declaring it in the
subcommand parser's default settings. This easily allows arbitrary completers like path_complete to be used.
See [subcommands.py](https://github.com/python-cmd2/cmd2/blob/master/examples/subcommands.py) for an example of how to use
tab completion in subcommands. In addition, the docstring for ``cmd_with_subs_completer()`` offers more details.

* Bug Fixes
* Fixed a bug in tab completion of command names within sub-menus
* Fixed a bug when using persistent readline history in Python 2.7
* Fixed a bug where the ``AddSubmenu`` decorator didn't work with a default value for ``shared_attributes``
* Added a check to ``ppaged()`` to only use a pager when running in a real fully functional terminal
* Enhancements
* Added [quit_on_sigint](http://cmd2.readthedocs.io/en/latest/settingchanges.html#quit-on-sigint) attribute to enable canceling current line instead of quitting when Ctrl+C is typed
* Added possibility of having readline history preservation in a SubMenu
* Added [table_display.py](https://github.com/python-cmd2/cmd2/blob/master/examples/table_display.py) example to demonstrate how to display tabular data
* Added command aliasing with ``alias`` and ``unalias`` commands
* Added the ability to load an initialization script at startup
* See [alias_startup.py](https://github.com/python-cmd2/cmd2/blob/master/examples/alias_startup.py) for an example
* Added a default SIGINT handler which terminates any open pipe subprocesses and re-raises a KeyboardInterrupt
* For macOS, will load the ``gnureadline`` module if available and ``readline`` if not

* Bug Fixes
* Fixed a bug if a non-existent **do_*** method was added to the ``exclude_from_help`` list
* Fixed a bug in a unit test which would fail if your home directory was empty on a Linux system
* Fixed outdated help text for the **edit** command
* Fixed outdated [remove_unused.py](https://github.com/python-cmd2/cmd2/blob/master/examples/remove_unused.py)
* Enhancements
* Added support for sub-menus.
* See [submenus.py](https://github.com/python-cmd2/cmd2/blob/master/examples/submenus.py) for an example of how to use it
* Added option for persistent readline history
* See [persistent_history.py](https://github.com/python-cmd2/cmd2/blob/master/examples/persistent_history.py) for an example
* See the [Searchable command history](http://cmd2.readthedocs.io/en/latest/freefeatures.html#searchable-command-history) section of the documentation for more info
* Improved PyPI packaging by including unit tests and examples in the tarball
* Improved documentation to make it more obvious that **poutput()** should be used instead of **print()**
* ``exclude_from_help`` and ``excludeFromHistory`` are now instance instead of class attributes
* Added flag and index based tab completion helper functions
* See [tab_completion.py](https://github.com/python-cmd2/cmd2/blob/master/examples/tab_completion.py)
* Added support for displaying output which won't fit on the screen via a pager using ``ppaged()``
* See [paged_output.py](https://github.com/python-cmd2/cmd2/blob/master/examples/paged_output.py)
* Attributes Removed (**can cause breaking changes**)
* ``abbrev`` - Removed support for abbreviated commands
* Good tab completion makes this unnecessary and its presence could cause harmful unintended actions
* ``case_insensitive`` - Removed support for case-insensitive command parsing
* Its presence wasn't very helpful and could cause harmful unintended actions

* Bug Fixes
* Fixed unit tests on Python 3.7 due to changes in how re.escape() behaves in Python 3.7
* Fixed a bug where unknown commands were getting saved in the history
* Enhancements
* Three new decorators for **do_*** commands to make argument parsing easier
* **with_argument_list** decorator to change argument type from str to List[str]
* **do_*** commands get a single argument which is a list of strings, as pre-parsed by shlex.split()
* **with_arparser** decorator for strict argparse-based argument parsing of command arguments
* **do_*** commands get a single argument which is the output of argparse.parse_args()
* **with_argparser_and_unknown_args** decorator for argparse-based argument parsing, but allows unknown args
* **do_*** commands get two arguments, the output of argparse.parse_known_args()
* See the [Argument Processing](http://cmd2.readthedocs.io/en/latest/argument_processing.html) section of the documentation for more information on these decorators
* Alternatively, see the [argparse_example.py](https://github.com/python-cmd2/cmd2/blob/master/examples/argparse_example.py)
and [arg_print.py](https://github.com/python-cmd2/cmd2/blob/master/examples/arg_print.py) examples
* Added support for Argparse subcommands when using the **with_argument_parser** or **with_argparser_and_unknown_args** decorators
* See [subcommands.py](https://github.com/python-cmd2/cmd2/blob/master/examples/subcommands.py) for an example of how to use subcommands
* Tab completion of subcommand names is automatically supported
* The **__relative_load** command is now hidden from the help menu by default
* This command is not intended to be called from the command line, only from within scripts
* The **set** command now has an additional **-a/--all** option to also display read-only settings
* The **history** command can now run, edit, and save prior commands, in addition to displaying prior commands.
* The **history** command can now automatically generate a transcript file for regression testing
* This makes creating regression tests for your ``cmd2`` application trivial
* Commands Removed
* The **cmdenvironment** has been removed and its functionality incorporated into the **-a/--all** argument to **set**
* The **show** command has been removed. Its functionality has always existing within **set** and continues to do so
* The **save** command has been removed. The capability to save commands is now part of the **history** command.
* The **run** command has been removed. The capability to run prior commands is now part of the **history** command.
* Other changes
* The **edit** command no longer allows you to edit prior commands. The capability to edit prior commands is now part of the **history** command. The **edit** command still allows you to edit arbitrary files.
* the **autorun_on_edit** setting has been removed.
* For Python 3.4 and earlier, ``cmd2`` now has an additional dependency on the ``contextlib2`` module
* Deprecations
* The old **options** decorator for optparse-based argument parsing is now *deprecated*
* The old decorator is still present for now, but will be removed in a future release
* ``cmd2`` no longer includes **optparse.make_option**, so if your app needs it import directly from optparse

* Bug Fixes
* Fixed a couple broken examples
* Enhancements
* Improved documentation for modifying shortcuts (command aliases)
* Made ``pyreadline`` a dependency on Windows to ensure tab completion works
* Other changes
* Abandoned official support for Python 3.3. It should still work, just don't have an easy way to test it anymore.

* Bug Fixes
* Fixed ``poutput()`` so it can print an integer zero and other **falsy** things
* Fixed a bug which was causing autodoc to fail for building docs on Readthedocs
* Fixed bug due to ``pyperclip`` dependency radically changing its project structure in latest version
* Enhancements
* Improved documentation for user-settable environment parameters
* Improved documentation for overriding the default supported comment styles
* Added ``runcmds_plus_hooks()`` method to run multiple commands w/o a cmdloop