Adding modules

Development setup

Currently the easiest way to test Stylix is to use the new code in your actual configuration.

You might find it useful to change the flake reference in your configuration from github:danth/stylix to git+file:/home/user/path/to/stylix so that you don't need to push your changes to GitHub during testing.

Then, remember to run nix flake lock --update-input stylix to refresh the flake each time you make an edit.

Nix only reads files which are tracked by Git, so you also need to git add «file» after creating a new file.

Module naming

Modules should be named like modules/«name»/«platform».nix. For example, modules/avizo/hm.nix is a Home Manager module which themes Avizo.

The following platforms are supported:

• NixOS (nixos)
• Home Manager (hm)
• Nix-Darwin (darwin)

Correctly named modules will be imported automatically.

Other files needed by the module can also be stored within the modules/«name» folder, using any name which is not on the list above.

Module template

All modules should have an enable option created using mkEnableTarget. This is similar to mkEnableOption from the standard library, however it integrates with stylix.enable and stylix.autoEnable and generates more specific documentation.

A general format for modules is shown below.

{ config, lib, ... }:

{
  options.stylix.targets.«name».enable =
    config.lib.stylix.mkEnableTarget "«human readable name»" true;

  config = lib.mkIf (config.stylix.enable && config.stylix.targets.«name».enable) {
    programs.«name».backgroundColor = config.lib.stylix.colors.base00;
  };
}

The human readable name will be inserted into the following sentence:

Whether to enable theming for «human readable name».

If your module will touch options outside of programs.«name» or services.«name», it should include an additional condition in mkIf to prevent any effects when the target is not installed.

The boolean value after mkEnableTarget should be changed to false if one of the following applies:

• The module requires further manual setup to work correctly.
• There is no reliable way to detect whether the target is installed, and enabling it unconditionally would cause problems.

How to apply colors

Refer to the style guide to see how colors are named, and where to use each one.

The colors are exported under config.lib.stylix.colors, which originates from mkSchemeAttrs.

You can use the values directly:

{
  environment.variables.MY_APPLICATION_COLOR = config.lib.stylix.colors.base05;
}

Or you can create a Mustache template and use it as a function. This returns a derivation which builds the template.

{
  environment.variables.MY_APPLICATION_CONFIG_FILE =
    let configFile = config.lib.stylix.colors {
      template = ./config.toml.mustache;
      extension = ".toml";
    };
    in "${configFile}";
}

Setting options through an existing NixOS or Home Manager module is preferable to generating whole files, since users will have the option of overriding things individually.

Also note that reading generated files with builtins.readFile can be very slow and should be avoided.

How to apply other things

For everything else, like fonts and wallpapers, you can just take option values directly from config. See the reference pages for a list of options.