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Settings
========
- current settings and what they do
- how a developer can add their own
- how to hide built in settings from a user
Built In Settings
-----------------
``cmd2`` has a number of built in settings, which a developer can set a default
value, and which users can modify to change the behavior of the application.
Timing
~~~~~~
Setting ``App.timing`` to ``True`` outputs timing data after every application
command is executed. |settable|
Echo
~~~~
If ``True``, each command the user issues will be repeated to the screen before
it is executed. This is particularly useful when running scripts.
Debug
~~~~~
Setting ``App.debug`` to ``True`` will produce detailed error stacks whenever
the application generates an error. |settable|
.. |settable| replace:: The user can ``set`` this parameter
during application execution.
(See :ref:`parameters`)
.. _parameters:
Other user-settable parameters
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A list of all user-settable parameters, with brief
comments, is viewable from within a running application
with::
(Cmd) set --long
allow_ansi: Terminal # Allow ANSI escape sequences in output (valid values: Terminal, Always, Never)
continuation_prompt: > # On 2nd+ line of input
debug: False # Show full error stack on error
echo: False # Echo command issued into output
editor: vim # Program used by ``edit``
feedback_to_output: False # include nonessentials in `|`, `>` results
locals_in_py: False # Allow access to your application in py via self
max_completion_items: 50 # Maximum number of CompletionItems to display during tab completion
prompt: (Cmd) # The prompt issued to solicit input
quiet: False # Don't print nonessential feedback
timing: False # Report execution times
Any of these user-settable parameters can be set while running your app with
the ``set`` command like so::
set allow_ansi Never
Create New Settings
-------------------
Your application can define user-settable parameters which your code can
reference. First create a class attribute with the default value. Then update
the ``settable`` dictionary with your setting name and a short description
before you initialize the superclass. Here's an example, from
``examples/environment.py``:
.. literalinclude:: ../../examples/environment.py
If you want to be notified when a setting changes (as we do above), then define
a method ``_onchange_{setting}()``. This method will be called after the user
changes a setting, and will receive both the old value and the new value.
.. code-block:: text
(Cmd) set --long | grep sunny
sunny: False # Is it sunny outside?
(Cmd) set --long | grep degrees
degrees_c: 22 # Temperature in Celsius
(Cmd) sunbathe
Too dim.
(Cmd) set degrees_c 41
degrees_c - was: 22
now: 41
(Cmd) set sunny
sunny: True
(Cmd) sunbathe
UV is bad for your skin.
(Cmd) set degrees_c 13
degrees_c - was: 41
now: 13
(Cmd) sunbathe
It's 13 C - are you a penguin?
|
