cutiepi-rotation-scripts/bin/autorotate

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#!/bin/bash
pidfile=/tmp/autorotate.pid
if ps -p $(cat "$pidfile" 2>/dev/null) >/dev/null; then
echo "An autorotate process is already running - if not please remove $pidfile" >&2
exit 1
fi
echo $$ > "$pidfile"
script_dir="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
source "$script_dir/cutiepi-screen-common"
# Turn off the HDMI interface. This actually shouldn't be required, but taking
# the second display into account would make the xinput coordinate transformation
# matrices more complex (TODO it can be tackled later if there's enough demand for
# screen rotation features while the tablet is attached to another screen)
xrandr --output HDMI-2 --off
# Default rotation: standard horizontal
screen_set_horizontal
monitor-sensor | while read line; do
echo "$line" | egrep '^\s*Accelerometer orientation changed: ' >/dev/null || continue
orientation=$(echo "$line" | awk '{print $4}')
case "$orientation" in
left-up) screen_set_horizontal;;
normal) screen_set_vertical;;
right-up) screen_set_horizontal_inverted;;
bottom-up) screen_set_vertical_inverted;;
esac
done