NixTutorial/default.nix

{ pkgs, lib, config, ... }:
{
  options = {
    scripts.output = lib.mkOption {
      type = lib.types.package;
    };

    map = {
      zoom = lib.mkOption {
        type = lib.types.nullOr lib.types.int;
        default = 2;
      };
    };

    requestParams = lib.mkOption {
      type = lib.types.listOf lib.types.str;
    };
  };

  config = {
    scripts.output = pkgs.writeShellApplication {
      name = "map";

      runtimeInputs = with pkgs; [
        curl
        imagemagick
      ];

      text = ''
        convert <(${./map} ${lib.concatStringsSep " " config.requestParams}) sixel:-
      '';
    };

    requestParams = [
      "size=640x300"
      "scale=2"
      (lib.mkIf (config.map.zoom != null)
        "zoom=${toString config.map.zoom}")
    ];
  };
}