Introduce rofi lib func for simple chooser-action menu

lib/rofi.nix

@@ -11,11 +11,64 @@
   # }
   mkSimpleMenu = let
     # Makes a string like ''"Poweroff" "Reload Hyprland"''
-    unpack-options = attrs: "\"${lib.concatStringsSep "\" \"" builtins.attrNames attrs}\"";
-  in
-    prompt: attrs: ''
-      #! ${pkgs.fish}/bin/fish
+    unpack-options = attrs: "\"${lib.concatStringsSep "\" \"" (builtins.attrNames attrs)}\"";
 
-      set OPTIONS ${unpack-options attrs}
-    '';
+    mkCase = option: action: "else if test \"${option}\" = $OPTION\n    set ACTION \"${action}\"";
+
+    cases = attrs:
+      lib.pipe attrs [
+        (builtins.mapAttrs mkCase)
+        builtins.attrValues
+        (builtins.concatStringsSep "\n")
+      ];
+  in
+    prompt: attrs:
+      pkgs.writeScriptBin "rofi-menu-${prompt}" ''
+        #! ${pkgs.fish}/bin/fish
+
+        # OPTIONS contains all possible values Rofi will display
+        set OPTIONS ${unpack-options attrs}
+
+        # We choose a single OPTION using Rofi
+        set OPTION (echo -e (string join "\n" $OPTIONS) | rofi -dmenu -p " ${prompt} " -i)
+
+        # Check if the chosen OPTION is a valid choice from OPTIONS
+        if not contains $OPTION $OPTIONS
+            exit
+        end
+
+        # Set a command to execute based on the chosen OPTION
+        if false
+            exit # Easier to generate with this
+        ${cases attrs}
+        else
+            exit
+        end
+
+        # Execute the command
+        eval $ACTION
+      '';
+
+  # Receives attrs like:
+  # {
+  #   optionA = "exa -1 -D ~/Notes/TU";
+  #   optionB = "exa -1 -D ~/Notes/TU/$OPTIONA/Lecture | grep \".pdf\"";
+  #   commandB = "xdg-open ~/Notes/TU/$OPTIONA/Lecture/$OPTIONB";
+  # }
+  #
+  # Keys:
+  # - optionA, optionB   # Command that generates Rofi options:
+  #                        exa -1 -D ~/Notes/TU
+  #                        cat /etc/rofi-vpns
+  # - commandA, commandB # Action to execute after sth. was chosen (mutually excl. with command)
+  # - actionsA, actionsB # Configure actions by lookup (mutually excl. with command):
+  #                        actionsB = {"status" = "systemctl status..."}
+  # - colorA, colorB     # Configure highlighting conditions:
+  #                        colorA = {"red" = "systemctl ... | grep ..."};
+  #
+  # Use $OPTIONA and $OPTIONB to use the options chosen by option<A/B>-command and rofi
+  # Use $EVALA and $EVALB to use the outputs generated by command<A/B>
+  mkMenu = let
+  in
+    prompt: attrs: "";
 }