fork_demure_scripts/hdmi.sh

#!/bin/bash
## from https://wiki.archlinux.org/index.php/xrandr

XRANDR="xrandr"
CMD="${XRANDR}"
declare -A VOUTS
eval VOUTS=$(${XRANDR}|awk 'BEGIN {printf("(")} /^\S.*connected/{printf("[%s]=%s ", $1, $2)} END{printf(")")}')
declare -A POS
#XPOS=0
#YPOS=0
#POS="${XPOS}x${YPOS}"

POS=([X]=0 [Y]=0)

find_mode() {
    echo $(${XRANDR} |grep ${1} -A1|awk '{FS="[ x]"} /^\s/{printf("WIDTH=%s\nHEIGHT=%s", $4,$5)}')
}

xrandr_params_for() {
    if [ "${2}" == 'connected' ]; then
        eval $(find_mode ${1})  #sets ${WIDTH} and ${HEIGHT}
        MODE="${WIDTH}x${HEIGHT}"
        CMD="${CMD} --output ${1} --mode ${MODE} --pos ${POS[X]}x${POS[Y]}"
        POS[X]=$((${POS[X]}+${WIDTH}))
        return 0
      else
        CMD="${CMD} --output ${1} --off"
        return 1
    fi
}

for VOUT in ${!VOUTS[*]}
do
    xrandr_params_for ${VOUT} ${VOUTS[${VOUT}]}
done
set -x
${CMD}
set +x