modules: system: packages: make it configurable

modules/system/packages.nix

@@ -1,23 +1,36 @@
 # Common packages
-{ config, pkgs, ... }:
-
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.my.system.packages;
+in
 {
-  # List packages installed in system profile. To search, run:
-  # $ nix search wget
-  environment.systemPackages = with pkgs; [
-    git
-    git-crypt
-    mosh
-    vim
-    wget
-  ];
+  options.my.system.packages = with lib; {
+    enable = my.mkDisableOption "packages configuration";
 
-  programs.vim.defaultEditor = true; # Modal editing is life
-  programs.zsh = {
-    enable = true; # Use integrations
-    # Disable global compinit when a user config exists
-    enableGlobalCompInit = !config.my.home.zsh.enable;
+    allowUnfree = my.mkDisableOption "allow unfree packages";
   };
 
-  nixpkgs.config.allowUnfree = true; # Because I don't care *that* much.
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      git
+      git-crypt
+      mosh
+      vim
+      wget
+    ];
+
+    programs = {
+      vim.defaultEditor = true; # Modal editing is life
+
+      zsh = {
+        enable = true; # Use integrations
+        # Disable global compinit when a user config exists
+        enableGlobalCompInit = !config.my.home.zsh.enable;
+      };
+    };
+
+    nixpkgs.config = {
+      allowUnfree = cfg.allowUnfree; # Because I don't care *that* much.
+    };
+  };
 }