turn-off-monitors

#!/usr/bin/env bash
#########################################################################
# Turn Monitors Off via the Command Line (CLI)                          #
#                                                                       #
#   Does exactly what it says. It will turn off all of your monitors    #
#   until the mouse is moved or a key is pressed.                       #
#                                                                       #
# Part of HopeSeekr's BashScripts Collection                            #
# https://github.com/hopeseekr/BashScripts/                             #
#                                                                       #
# Copyright © 2020-2024 Theodore R. Smith <theodore@phpexperts.pro>     #
# GPG Fingerprint: 4BF8 2613 1C34 87AC D28F  2AD8 EB24 A91D D612 5690   #
#                                                                       #
# License: Creative Commons Attribution v4.0 International              #
#########################################################################

function turn-off-screen-in-wayland()
{
    echo "Turning off monitors..."
    if [[ $XDG_SESSION_DESKTOP == gnome* ]]; then
        _trigger-monitors-off-in-gnome-wayland

        local interaction_event=$(wait_until_mouse_or_keyboard_event)
        echo "Event Type: ${interaction_event}"

        echo "Turning monitors back on..."
        _trigger-monitors-on-in-gnome-wayland

    elif [[ $XDG_SESSION_DESKTOP == "plasma" || $XDG_SESSION_DESKTOP == "KDE" ]]; then
        _trigger-monitors-off-in-kde-wayland
    else
        echo "ERROR: Unsupported Wayland Desktop Environment: $XDG_SESSION_DESKTOP"
        exit 2
    fi
    }

function _trigger-monitors-off-in-gnome-wayland()
{
    busctl --user set-property org.gnome.Mutter.DisplayConfig /org/gnome/Mutter/DisplayConfig org.gnome.Mutter.DisplayConfig PowerSaveMode i 1
}

function _trigger-monitors-on-in-gnome-wayland()
{
    busctl --user set-property org.gnome.Mutter.DisplayConfig /org/gnome/Mutter/DisplayConfig org.gnome.Mutter.DisplayConfig PowerSaveMode i 0
}

function _trigger-monitors-off-in-kde-wayland()
{
    kscreen-doctor --dpms off
}

### BUILT FROM framework/wait_until_mouse_or_keyboard_event.sh
function wait_until_mouse_or_keyboard_event()
{
    # Ensure libinput-tools is installed
    if ! command -v libinput >/dev/null 2>&1; then
        echo "Error: libinput-tools is not installed. Please install it and try again."
        exit 1
    fi

    if ! command -v sudo >/dev/null 2>&1; then
        echo "Error: sudo is not installed. Please install it and try again."
        exit 1
    fi

    # Turn off the monitors.

    # Start monitoring input events
    echo "Monitoring input events. Press Ctrl+C to stop."
    sudo stdbuf -oL libinput debug-events | while read -r line; do
        case "$line" in
            *"KEYBOARD_KEY"*)
                echo "KEYBOARD_KEY"; return 0;
                ;;
            *"POINTER_BUTTON"*)
                echo "MOUSE_CLICK"; return 0;
                ;;
            *"POINTER_MOTION"*)
                echo "MOUSE_MOVED"; return 0;
                ;;
        esac
    done
}
### END framework/wait_until_mouse_or_keyboard_event.sh

if [ "$XDG_SESSION_TYPE" == "wayland" ]; then
    turn-off-screen-in-wayland
else
    sleep 0.5; xset dpms force off
fi