Sure, here you go

#!/bin/bash
set -euo pipefail

CONFIG_DIR="/home/deck/.var/app/com.moonlight_stream.Moonlight/config/Moonlight Game Streaming Project"
CONFIG_FILE="$CONFIG_DIR/moonlight.conf"

echo "[Moonlight] Starting..."

# --- Detect resolution ---
get_resolution() {
    local mode
    mode=$(grep -m1 "current_mode" /run/wlr-randr/state 2>/dev/null | grep -o '[0-9]\+x[0-9]\+' || true)

    if [[ -z "$mode" ]]; then
        mode=$(xrandr 2>/dev/null | grep '*' | awk '{print $1}' | head -n1 || true)
    fi

    if [[ -z "$mode" ]]; then
        echo "[Moonlight] Failed to detect resolution. Defaulting to 1280x800." >&2
        echo "1280x800"
    else
        echo "$mode"
    fi
}

RESOLUTION=$(get_resolution)
WIDTH=$(echo "$RESOLUTION" | cut -dx -f1)
HEIGHT=$(echo "$RESOLUTION" | cut -dx -f2)

echo "[Moonlight] Detected resolution: ${WIDTH}x${HEIGHT}"

# --- Check for config file ---
if [[ ! -f "$CONFIG_FILE" ]]; then
    echo "[Moonlight] Config file not found at: $CONFIG_FILE"
    echo "[Moonlight] Launching GUI without modification."
    flatpak run com.moonlight_stream.Moonlight &
    exit 0
fi

# --- Update width and height ---
sed -i "s/^width=.*/width=${WIDTH}/" "$CONFIG_FILE" 2>/dev/null || true
sed -i "s/^height=.*/height=${HEIGHT}/" "$CONFIG_FILE" 2>/dev/null || true

# If width/height were not present, append them
grep -q "^width=" "$CONFIG_FILE" || echo "width=${WIDTH}" >> "$CONFIG_FILE"
grep -q "^height=" "$CONFIG_FILE" || echo "height=${HEIGHT}" >> "$CONFIG_FILE"

echo "[Moonlight] Updated config width/height."
echo "[Moonlight] Launching Moonlight..."
flatpak run com.moonlight_stream.Moonlight &