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#!/bin/sh
set -eu
DEFAULT_POLL_TIME=5
debug=0
err()
{
local fmt="${1}"
shift 1
printf "Error: ${fmt}\n" "${@}" 1>&2
return 0
}
dbg()
{
local fmt="${1}"
shift 1
case "${debug}" in '1')
printf "DEBUG: ${fmt}\n" "${@}" 1>&2
esac
return 0
}
enable_devices()
{
local device=
dbg 'Enabling devices:'
for device in "${@}"; do
dbg ' %s' "${device}"
xinput --enable "${device}" || :
done
}
disable_devices()
{
local device=
dbg 'Disabling devices:'
for device in "${@}"; do
dbg ' %s' "${device}"
xinput --disable "${device}" || :
done
}
poll()
{
local poll_time=${1}
shift 1
local displays=
local prev_state=
local displays_on=
local displays_off=
local display=
local status=
local dpms=
local state=
displays="$(printf '%s ' \
/sys/devices/pci????:??/????:??:??.?/drm/card*/card*-*/ \
/sys/devices/pci????:??/????:??:??.?/????:??:??.?/drm/card*/card*-*/)"
prev_state=''
while :; do
displays_on=0
displays_off=0
for display in ${displays}; do
[ -f "${display}/status" ] || continue
read status 0<"${display}/status"
case "${status}" in 'disconnected')
continue
esac
read dpms 0<"${display}/dpms"
case "${dpms}" in
'On') displays_on=1;;
'Off') displays_off=1;;
esac
done
state='enable_devices'
case ${displays_on} in 0)
case ${displays_off} in 1)
state='disable_devices'
esac
esac
case "${state}" in
"${prev_state}");;
*)
"${state}" "${@}"
prev_state="${state}"
;;
esac
sleep ${poll_time}
done
}
usage()
{
printf 'Usage: %s [<options>] <device> [<device> ...]\n' "${0}"
printf '\n'
printf 'Options:\n'
printf ' -p <secs> Poll at least every <secs> seconds\n'
printf ' -d Enable debugging output\n'
}
main()
{
local move_win=
local opt=
local dir=
local dx=
local dy=
local cur_dt=
local new_dt=
poll_time=${DEFAULT_POLL_TIME}
while getopts 'p:d' opt "${@}"; do
case "${opt}" in
'p')
case "${OPTARG}" in *[!0-9]* | '')
usage 1>&2
return 1
esac
poll_time="${OPTARG}"
;;
'd') debug=1;;
'?')
usage 1>&2
return 1
;;
esac
done
shift $((${OPTIND} - 1))
if [ ${#} -lt 1 ]; then
usage 1>&2
return 1
fi
poll ${poll_time} "${@}"
return 0
}
main "${@}"
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