taskwarrior: add support

[trueNAHO]

This module themes the Taskwarrior (programs.taskwarrior.enable) Home Manager package.

However, I am unsure how to properly interpolate the Stylix colors into the current draft theme at modules/taskwarrior/template.theme.mustache. I am unsure whether {{base00-hex}} or {{base00-rgb-r}} are appropriate in this case: https://www.systutorials.com/docs/linux/man/5-task-color.

Once this PR merges, we could try to patch the theme upstream, and then remove it from this repo in a follow up PR.

Note that the current state properly applies the (non-Stylix) colors in my Home Manager setup.

[trueNAHO]

However, I am unsure how to properly interpolate the Stylix colors into the current draft theme at modules/taskwarrior/template.theme.mustache. I am unsure whether {{base00-hex}} or {{base00-rgb-r}} are appropriate in this case: https://www.systutorials.com/docs/linux/man/5-task-color.

Considering that GothenburgBitFactory/taskwarrior#2415 had no activity in the last three years, it seems like Taskwarrior does not support conventional RGB values.

Upon deep investigation, I realised that Taskwarrior represents the traditional RGB range of [0-255][0-255][0-255] with rgb[0-5][0-5][0-5]:

A value of 0 means none of this component color, and a value of 5 means the most intense component color.

(Source: https://www.systutorials.com/docs/linux/man/5-task-color)

Consequently, e73c494 adds local variables mapping the traditional RGB range (0--255) to Taskwarrior's RGB range (0--5).

However, now I am stuck because I don't know how to interpolate the new variables in the template:

https://github.com/trueNAHO/stylix/blob/e73c494cc1fc1b40f6f81021e1f9dfabc203cf23/modules/taskwarrior/hm.nix#L35-L37

[danth]

config.lib.stylix.colors comes from an external library which doesn't currently provide a way to add custom variables.

Your best option is to implement that functionality upstream, which would be helpful for some other features in Stylix too.

Alternatively we could call mustache directly with all of the values the template needs.

[trueNAHO]

Seems like config.lib.stylix.colors depends on base16.nix:

stylix/stylix/palette.nix

Lines 125 to 130 in a9e3ce0

	config = {
	# This attrset can be used like a function too, see
	# https://github.com/SenchoPens/base16.nix#mktheme
	lib.stylix.colors = (base16.mkSchemeAttrs cfg.base16Scheme).override override;
	lib.stylix.scheme = base16.mkSchemeAttrs cfg.base16Scheme;
	};

Maybe one of the following procedures allows specifying local variables:

https://github.com/SenchoPens/base16.nix/blob/b390e87cd404e65ab4d786666351f1292e89162a/README.md#-how-to