fish: try out argparse on port listener

This reverts commit f11ed4a3c81e6963704e8f8b2f086c4509d54255.

fish/functions/port_listener.fish

@@ -1,7 +1,16 @@
-function port_listener --argument-names port
-    if test -n "$port"
-        lsof -n -i :$port | rg LISTEN
-    else
-        lsof -n -i | rg LISTEN
+function port_listener
+    argparse 'h/help' 'p#port' 'S/sudo' -- $argv
+
+    if test -n "$_flag_help"
+        echo "Usage: port_listener [-h] [--help] [-p <port>] [--port=<port>] [-S] [--sudo]"
+        return 0
     end
+
+    set -q _flag_sudo; and set -l _pl_cmd_prefix "sudo "
+    set -q _flag_port; and set -l _pl_cmd_suffix " :$_flag_port"
+
+    set -l _port_listener_cmd (printf '%s%s%s | rg LISTEN' $_pl_cmd_prefix 'lsof -n -P -i' $_pl_cmd_suffix)
+
+    echo $_port_listener_cmd
+    eval $_port_listener_cmd
 end