Conditional Modules

Make a module that does something based on configuration options.

Create a simple option that can be configured by setting customoption1=true.

Bonus Have a nested conditional statement that happens if option 2 is set inside of option 1.

 {config, pkgs, lib, ...}:

let
  option1 = config.customoptions.option1 ;
  option2 = config.customoptions.option2 ;
in
   with lib;
{

  options = {
    customoptions = {
      option1 = {
        enable = mkOption {
         default = false;
         type = with types; bool;
         description = ''
           Option 1 description
         '';
        };
      };

      option2 = {
        enable = mkOption {
        default = false;
        type = with types; bool;
        description = ''
          Option 2 description
        '';
        };
      };
    };
  };

   config = mkIf option1.enable {
     environment.etc."sample".text =
      if config.customoptions.option2.enable
      then "option2 enabled"
      else "option1 enabled";
   };
}