rotate-screen

#!/bin/bash
# Rotate the screen into portrait mode if it is in landscape and vice versa.
# See also:
# - https://gist.githubusercontent.com/mortie/e725d37a71779b18e8eaaf4f8a02bf5b/raw/2a58de65dd2c2022340b6432ca88ee483b1d25d8/auto-screen-rotate.sh
# - https://gist.github.com/mortie/297a966e22e788c80570fa37d4a15809
# - https://github.com/alesguzik/linux_detect_tablet_mode

MONITOR="${MONITOR:-eDP1}"
TOUCHSCREENS=(10 16) # ELAN238E:00 04F3:2894 & ELAN238E:00 04F3:2894 Pen
PATTERN='\s\(\w\+\s\)*[0-9]\+x[0-9]\++[0-9]\++[0-9]\sleft'

if xrandr -q | grep -q "^${MONITOR}${PATTERN}"; then
    xrandr --output "$MONITOR" --rotate normal
    for T in "${TOUCHSCREENS[@]}"; do
        xinput set-prop "$T" \
            --type=float "Coordinate Transformation Matrix" 0 0 0 0 0 0 0 0 0
    done
else
    xrandr --output "$MONITOR" --rotate left
    for T in "${TOUCHSCREENS[@]}"; do
        xinput set-prop "$T" \
            --type=float "Coordinate Transformation Matrix" 0 -1 1 1 0 0 0 0 1
    done
fi