#!/bin/bash

### Configuration
SLEEP=5                                         # poll lid state every SLEEP seconds
UNROTATE="yes"                                  # restore normal orientation when lid is open
ROTATE="/usr/local/bin/rotate-screen"           # rotate-screen command
LID="/proc/acpi/button/lid/LID"                 # lid status path
SPOOL_FILE="/var/spool/rotate-screen/rotation"  # 'rotate-screen' command spool file
###



while true; do
    # get current rotation state from run file if it exists
    DISPLAY="$(cat $SPOOL_FILE | cut -d' ' -f2)"
    XAUTH="$(cat $SPOOL_FILE | cut -d' ' -f3)"
    ROTATION="$(XAUTHORITY=$XAUTH DISPLAY=$DISPLAY xrandr --query --verbose | grep ' connected' | cut -d' ' -f5)"
    LID_STATE="$(cat $LID/state | awk '{print $2}')"
    HIBERNATING="$(ps aux | grep '[h]ibernate')"

    if [ x"$LID_STATE" = x"closed" -a x"$ROTATION" = x"normal" -a x"$HIBERNATING" = x ]; then
        "$ROTATE"
	echo rotate
    elif [ x"$LID_STATE" = x"open" -a ! x"$ROTATION" = x"normal" ]; then
	[ "$UNROTATE" = "yes" ] && "$ROTATE" normal && 	echo restore
    fi

    sleep $SLEEP
done