support for color theme plugins

[geier]

With this PR we support plugins that provide color themes.

A first example plugin implementing a gruvbox plugin can be found here: here https://github.com/geier/khal_gruvbox

[mb720]

Since this is closed now, is there another issue that people interested in color theme support can track?

[geier]

Not really, with #1312 color theme plugins should work.

Are you looking for something specific?

[mb720]

I'm really interested in configuring colors via a different config file than /usr/lib/python3.12/site-packages/khal/ui/colors.py since that gets overwritten on updates (I'm on Arch). I'm currently using khal version 0.11.3 and tried yesterday to get the new color theme plugin to work:

1. I copied __init__.py to ~/.local/share/khal/plugins, that's my XDG_DATA_HOME.
2. I changed ~/.config/khal/config to use it:

[view]
  theme = gruvbox

3. But I got this error:

critical: config error:
critical: in [view] theme: the value "gruvbox" is unacceptable.

Maybe I overlooked something or my version of khal on Arch doesn't support the plugins yet.

Thanks for your help and generally your work on khal!

[geier]

Sorry, I forgot to merge the importlib branch (I have done that now).

You will need to install that package, the README has a pointer. Open an issues here or at khal_gruvbox if you have any issues.