Alexander
104 lines
3.5 KiB
Nix
104 lines
3.5 KiB
Nix
{ config, lib, pkgs, options, ... }:
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with lib;
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let
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cfg = config.dov.dynamic-theme;
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schemes = "${pkgs.base16-schemes}/share/themes";
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# Single source of truth for builtin themes
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builtinThemes = {
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gruvbox = {
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dark = "${schemes}/gruvbox-dark-hard.yaml";
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light = "${schemes}/gruvbox-light-hard.yaml";
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};
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catppuccin = {
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dark = "${schemes}/catppuccin-mocha.yaml";
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light = "${schemes}/catppuccin-latte.yaml";
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};
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};
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# Generate all theme-variant combinations
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themeVariants = concatMapAttrs (name: theme: {
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"${name}-dark" = { scheme = theme.dark; polarity = "dark"; };
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"${name}-light" = { scheme = theme.light; polarity = "light"; };
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}) cfg.themes;
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# Base is gruvbox-dark, everything else is a specialisation
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baseVariant = "gruvbox-dark";
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specialisationVariants = filterAttrs (name: _: name != baseVariant) themeVariants;
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availableVariants = concatStringsSep " " (attrNames themeVariants);
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# Userspace theme switcher: activates a pre-built Home Manager
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# specialisation generation. No sudo, no OS rebuild — just runs the
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# specialisation's activation script in the base HM generation.
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#
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# The script logic lives in ./theme-switch.sh (plain shell, no Nix
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# escaping); we only inject the two config-derived values it needs.
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theme-switch = pkgs.writeShellScriptBin "theme-switch" ''
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baseVariant="${baseVariant}"
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availableVariants="${availableVariants}"
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${builtins.readFile ./theme-switch.sh}
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'';
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# Stylix is only declared on hosts that import its Home Manager module
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# (e.g. `fujin`). Servers (susano, izanagi, amaterasu, ...) don't, so
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# `stylix` isn't declared there. We probe option *declarations* (not
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# config values) to avoid an evaluation cycle.
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hasStylix = options ? stylix;
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in {
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options.dov.dynamic-theme = {
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enable = mkEnableOption "dynamic theme switching";
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themes = mkOption {
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type = types.attrsOf (types.submodule {
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options = {
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dark = mkOption {
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type = types.path;
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description = "Path to dark variant base16 scheme";
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};
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light = mkOption {
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type = types.path;
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description = "Path to light variant base16 scheme";
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};
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};
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});
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default = builtinThemes;
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description = "Available themes with dark and light variants";
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};
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};
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config = mkIf cfg.enable (
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{
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home.packages = [ theme-switch ];
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}
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# Only reference the `stylix` option where it is actually declared.
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# `mkIf false` is NOT enough: the module system still rejects a
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# definition (even a disabled one) for an option that does not exist,
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# which breaks every host that doesn't import stylix. `optionalAttrs`
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# removes the key structurally, so non-stylix hosts evaluate cleanly.
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// optionalAttrs hasStylix {
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stylix = {
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enable = true;
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autoEnable = true;
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# Base scheme/polarity; overridable per specialisation below.
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base16Scheme = mkDefault themeVariants.${baseVariant}.scheme;
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polarity = mkDefault themeVariants.${baseVariant}.polarity;
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};
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# Generate Home Manager specialisations for every non-base variant.
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# Each is pre-built into the nix store during the single rebuild and
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# activated userspace via `theme-switch` (no sudo, no OS rebuild).
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specialisation = mapAttrs (name: variant: {
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configuration = {
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stylix = {
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base16Scheme = mkForce variant.scheme;
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polarity = mkForce variant.polarity;
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};
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};
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}) specialisationVariants;
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}
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);
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}
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