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Thomas De Schampheleire
cli: initial introduction of 'kallithea-cli' command

This commit adds a command 'kallithea-cli' that intends to replace the
existing set of 'gearbox' commands that relate to setting up kallithea.
Gearbox would still be used for 'gearbox serve', but other commands like
'make-config', 'setup-db', etc. would be converted to 'kallithea-cli'
commands.

The python package 'Click' is used to generate the CLI. Using decorators,
this package makes it very easy to generate a CLI out of simple methods.
See: http://click.pocoo.org/7/

Using Gearbox for custom commands is possible, but documentation on this
topic is limited. As the added value of Gearbox for that use case is not
clear, we can well switch to something else if it seems better/easier.
.. _debugging:

===================
Debugging Kallithea
===================

If you encounter problems with Kallithea, here are some instructions
on how to debug them.

.. note:: First make sure you're using the latest version available.


Enable detailed debug
---------------------

Kallithea uses the standard Python ``logging`` module to log its output.
By default only loggers with ``INFO`` level are displayed. To enable full output
change ``level = DEBUG`` for all logging handlers in the currently used .ini file.
This change will allow you to see much more detailed output in the log file or
console. This generally helps a lot to track issues.


Enable interactive debug mode
-----------------------------

To enable interactive debug mode simply comment out ``set debug = false`` in
the .ini file. This will trigger an interactive debugger each time
there is an error in the browser, or send a http link if an error occurred in the backend. This
is a great tool for fast debugging as you get a handy Python console right
in the web view.

.. warning:: NEVER ENABLE THIS ON PRODUCTION! The interactive console
             can be a serious security threat to your system.