Added ps2-disc-rename.

ps2-disc-rename

@@ -0,0 +1,23 @@
+#!/bin/bash
+# A simple tool to prepend PS2 disc image file names with their appropriate gameids.
+# This is just for OpenPS2Loader, and requires hdl-dump.
+
+for disc_name in "$@"; do
+    disc_path="$(realpath "$disc_name")"
+    disc_dir="$(dirname "$disc_path")"
+    disc_short="$(basename "$disc_path")"
+
+    hdldump_output="$(hdl-dump cdvd_info "$disc_path" | cut -d ' ' -f 1)"
+    gameid="${hdldump_output//\"/}"
+
+    if ! echo "$disc_path" | grep -q "$gameid"; then
+        new_disc_filename="${gameid}.${disc_short}"
+        new_disc_path="${disc_dir}/${new_disc_filename}"
+
+        echo "Previous path: ${disc_path}"
+        echo "New path: ${new_disc_path}"
+        mv "$disc_path" "$new_disc_path"
+    else
+        echo "${disc_short} is already named correctly."
+    fi
+done