{ inputs, lib, ... }:
{
  flake.homeModules.shell = { config, ... }:
  {
    options.shell.program = lib.mkOption {
      type = lib.types.enum [ "bash" "zsh" ];
      default = "zsh";
      description = "Which interactive shell configuration to enable.";
    };

    imports = with inputs.self.homeModules; [ bash zsh ];

    config = {
      programs.bash.enable = lib.mkForce (config.shell.program == "bash");
      programs.zsh.enable  = lib.mkForce (config.shell.program == "zsh");
      home.shell.enableShellIntegration = true;
    };
  };
}