#!/bin/bash

# Check if gnome-shell is running as `gdctl` is GNOME only
if ! pgrep -x "gnome-shell" > /dev/null; then
    echo "Error: gnome-shell is not running."
    return 1
fi

# Set scale explicitly to argument value.  
if [ $# -eq 1 ]; then
    # gdctl set -LM Meta-0 --primary --scale $1
    SCALE=$1
else
    # If no argument is given, toggle between 1.0 and 1.5 scales.
    if gdctl show | grep -q "Scale: 1.0"; then
        #gdctl set -LM Meta-0 --primary --scale 1.5
        SCALE=1.5
    else
        #gdctl set -LM Meta-0 --primary --scale 1
        SCALE=1
    fi
fi

# Apply and output.
gdctl set -LM Meta-0 --primary --scale $SCALE
printf "Setting display scale to: $SCALE\n"