working wrapper

lib.nix

@@ -1,4 +1,46 @@
 { pkgs }:
+let
+  inherit (pkgs) lib;
+in
 {
-  mkWrapper = { }: { };
+  mkWrapper =
+    {
+      config,
+      name,
+      enableTui ? false,
+    }:
+    let
+      removeNullAndEmptyAttrs =
+        attrs:
+        let
+          f = lib.filterAttrsRecursive (key: value: value != null && value != { });
+        in
+        # filterAttrsRecursive doesn't delete the *resulting* empty attrs, so we must
+        # evaluate it again and to get rid of it.
+        lib.pipe attrs [
+          f
+          f
+        ];
+      toPCJson =
+        name: attrs:
+        pkgs.writeTextFile {
+          name = "process-compose-${name}.json";
+          text = builtins.toJSON attrs;
+        };
+      configFile = toPCJson name (
+        removeNullAndEmptyAttrs (
+          config
+          // {
+            is_tui_disabled = !enableTui;
+          }
+        )
+      );
+    in
+    pkgs.writeShellApplication {
+      inherit name;
+      text = ''
+        PC_CONFIG_FILES=${configFile} ${pkgs.process-compose}/bin/process-compose "$@"
+
+      '';
+    };
 }