switch audio with rofi and add extraLib

overlays/lib.nix

@@ -0,0 +1,16 @@
+_final: prev: {
+  extraLib = prev.lib // {
+
+    # Quickly package shell scripts with their dependencies
+    # From https://discourse.nixos.org/t/how-to-create-a-script-with-dependencies/7970/6
+    mkScript = { name, file, env ? [ ] }:
+      prev.pkgs.writeScriptBin name ''
+        for i in ${prev.lib.concatStringsSep " " env}; do
+          export PATH="$i/bin:$PATH"
+        done
+
+        exec ${prev.pkgs.bash}/bin/bash ${file} $@
+      '';
+  };
+
+}