Fix zet script

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

modules/scripts/zet.nix

@@ -0,0 +1,37 @@
+{ inputs, withSystem, ... }:
+
+let
+  name = "zet";
+in
+{
+  perSystem =
+    { pkgs, ... }:
+    {
+      packages.${name} = pkgs.writeShellApplication {
+        inherit name;
+
+        bashOptions = [ "pipefail" ];
+
+        runtimeInputs = with pkgs; [
+          bashInteractive
+          coreutils
+          fzf
+          git
+        ];
+
+        text = builtins.readFile "${inputs.zet}/${name}";
+      };
+    };
+
+  flake.modules.homeManager.base =
+    { config, pkgs, ... }:
+    {
+      home.packages = [
+        (withSystem pkgs.system (psArgs: psArgs.config.packages.${name}))
+      ];
+
+      home.sessionVariables = {
+        ZET_DIR = "${config.xdg.userDirs.documents}/zet";
+      };
+    };
+}

modules/zet/default.nix

@@ -1,26 +0,0 @@
-{ inputs, ... }:
-
-{
-  flake.modules.homeManager.base =
-    { pkgs, ... }:
-    {
-      home.packages =
-        let
-          name = "zet";
-        in
-        [
-          (pkgs.writeShellApplication {
-            inherit name;
-
-            runtimeInputs = with pkgs; [
-              bashInteractive
-              coreutils
-              fzf
-              git
-            ];
-
-            text = builtins.readFile "${inputs.zet}/${name}";
-          })
-        ];
-    };
-}