Make it easier to discover available output formats

[mfussenegger]

The available formats are listed in the docs but they're not easy to discover when using the CLI.

crash --help shows:

--format FORMAT the output FORMAT of the SQL response

crash --format shows:

crash: error: argument --format: expected one argument

crash --format invalid finally shows them:

crash: error: argument --format: invalid choice: 'invalid' (choose from 'tabular', 'json', 'csv', 'raw', 'mixed', 'dynamic', 'json_row')

Not sure how to best solve this. Maybe --help could include a hint, or --format without any other argument could list them

[amotl]

Hi Mathias,

thank you for your suggestion. An improvement to display the list of available output formats using crash --help has been implemented with GH-412. It has been included into crash 0.30.1, which is now available as a package from PyPI and as a standalone application.

With kind regards,
Andreas.