#!/bin/bash
# -----------------------------------------------------------------------------#
# Display Scale Toggling Script for GNOME RDP Session. Writen to work with the #
# Custom Command Toggles GNOME extension. Note: use the following command to   #
# get the current scale as the check check command of the exteion:             #
#   $ gdctl show | grep Scale:\.*                                              #
# -----------------------------------------------------------------------------#

# Only for GNOME shell.
if ! pgrep -x "gnome-shell" > /dev/null; then
    echo "Error: gnome-shell is not running."
    exit 1
fi

# Only for remote session.
if ! gdctl show | grep -q "Meta-0"; then
    echo "Error: could not find monitor Meta-0, seems not a remote session."
    exit 2
fi

# Explicit scale.  
if [ $# -eq 1 ]; then
    SCALE=$1
else
    # Toggle if not specified.
    if gdctl show | grep -q "Scale: 1.0"; then
        SCALE=1.5
    else
        SCALE=1
    fi
fi

# Apply
gdctl set -LM Meta-0 --primary --scale $SCALE

# Print output for the check-command.
printf "Setting display scale to: $SCALE\n"