dotfiles.nix/home/extras/kitty/auto-theme.nix

{ config, pkgs, lib, ... }:
let
  cfg = config.programs.kitty;
  # helper scripts for changing kitty colors
  term-background = pkgs.writeShellScriptBin "term-background" ''
    # Accepts the name of a theme file in color-pkg
    # If shell is running in a Kitty window set the colors.
    if [ -n "$KITTY_WINDOW_ID" ]; then
      kitty @ --to $KITTY_LISTEN_ON set-colors --all --configured \
        ${cfg.colors.colors-path}/"$1".conf &
    fi
  '';
  term-light = pkgs.writeShellScriptBin "term-light" ''
    ${term-background}/bin/term-background ${cfg.colors.light-name}
  '';
  term-dark = pkgs.writeShellScriptBin "term-dark" ''
    ${term-background}/bin/term-background ${cfg.colors.dark-name}
  '';
in {
  options.programs.kitty = {
    colors = {
      enable = lib.mkOption {
        type = lib.types.bool;
        default = false;
        description = ''
          When enabled, commands <command>term-dark</command> and <command>term-light</command>
          will toggle between your dark and a light colors.

          There is also <command>term-background</command> which accepts one argument, the name
          of the theme.

          (Note that the Kitty setting <literal>allow_remote_control = true</literal> is set to
          enable this functionality.)
        '';
      };

      colors-path = lib.mkOption {
        type = lib.types.path;
        default = "${pkgs.terminal-colors}/kitty";
        description = "Path from which to load kitty colors.";
      };

      color-pkg-path = lib.mkOption {
        type = lib.types.optional lib.types.path;
        default = null;
        description = ''
          Path to kitty colors within <literal>color-pkgs</literal>.
        '';
      };

      light-name = lib.mkOption {
        type = lib.types.str;
        default = "light";
        description = "The name to use for the light colorscheme.";
      };

      dark-name = lib.mkOption {
        type = lib.types.str;
        default = "dark";
        description = "The name to use for the dark colorscheme.";
      };
    };

  };

  config = lib.mkIf (cfg.enable && cfg.colors.enable) {
    home.packages = [ term-light term-dark term-background ];

    programs.kitty.settings = {
      allow_remote_control = "yes";
      listen_on = "unix:/tmp/mykitty";
    };

    xdg.configFile."kitty/macos-launch-services-cmdline".text =
      lib.mkIf pkgs.stdenv.isDarwin "--listen-on unix:/tmp/mykitty";
  };
}