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Thomas De Schampheleire
cli: fix celery-run usage text

Make sure that the help text and error messages from Celery (e.g. from
'kallithea-cli celery-run -c my.ini -- --help' or '-- -xyz') contain a valid
'Usage:' string.

Without these changes, the usage string will use the arbitrary description from
2c3d30095d5e and a full path:
Usage: kallithea celery worker .../bin/kallithea-cli [options]

With the changes, it becomes:
Usage: kallithea-cli celery-run -c CONFIG_FILE -- [options]

Click will let optparse find 'kallithea-cli' from argv[0]. The command part
'celery-run -c CONFIG_FILE --' could perhaps be found with Click introspection,
but it is simpler and perhaps equally reliable to make it explicit.

Original change modified by Mads Kiilerich.
.. _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.