add programs.zsh module

default.nix

@@ -18,6 +18,7 @@ let
         ./modules/services/activate-system.nix
         ./modules/services/nix-daemon.nix
         ./modules/programs/tmux.nix
+        ./modules/programs/zsh.nix
       ];
   };
 

modules/examples/lnl.nix

@@ -37,11 +37,12 @@
     set -g status-fg white
   '';
 
+  programs.zsh.enable = true;
+  programs.zsh.shell = "${pkgs.lnl.zsh}/bin/zsh";
+
   environment.variables.EDITOR = "vim";
   environment.variables.HOMEBREW_CASK_OPTS = "--appdir=/Applications/cask";
 
-  environment.variables.SHELL = "${pkgs.lnl.zsh}/bin/zsh";
-
   environment.variables.GIT_SSL_CAINFO = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
   environment.variables.SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
 

modules/programs/zsh.nix

@@ -0,0 +1,37 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.zsh;
+
+in
+
+{
+  options = {
+
+    programs.zsh.enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to configure zsh as an interactive shell.
+      '';
+    };
+
+    programs.zsh.shell = mkOption {
+      type = types.path;
+      default = "${pkgs.zsh}/bin/zsh";
+      description = ''
+        Zsh shell to use.
+      '';
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+
+    environment.variables.SHELL = "${cfg.shell}";
+
+  };
+}