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|
#!/bin/bash
display_help() {
>&2 printf 'lights-out version #VERSION#\n'
>&2 printf '\n'
>&2 printf 'usage:\n'
>&2 printf ' lights-out get $input: display inverted pin state of $input\n'
>&2 printf ' lights-out help: display this help and exit\n'
>&2 printf ' lights-out init: init gpio\n'
>&2 printf ' lights-out name: print the name of the server\n'
>&2 printf ' lights-out push $output $time: simulate push on $output for $time seconds\n'
>&2 printf ' lights-out turn on: turn on machine if not yet running\n'
}
check_argument_count() {
local count="$1"
shift
if [ $# -ne "${count}" ]; then
>&2 printf 'wrong number of arguments: "%s" expects %s argument' "$1" "${count}"
if [ "${count}" -ne 1 ]; then
printf 's'
fi
printf ', but %s were given\n\n' "$#"
display_help
exit 1
fi
}
if [ $# -lt 1 ]; then
display_help
exit 1
fi
if [ ! -r '#ETCDIR#/lights-out.conf' ]; then
>&2 printf 'cannot read config file "#ETCDIR#/lights-out.conf"\n'
exit 1
fi
if ! command -v gpio >/dev/null 2>&1; then
>&2 printf 'cannot find command "gpio" - is it installed?\n'
exit
fi
unset inputs
unset outputs
declare -A inputs
declare -A outputs
. '#ETCDIR#/lights-out.conf'
if [ -z "${inputs['power']}" ]; then
>&2 printf 'invalid config "#ETCDIR#/lights-out.conf": no power input defined.\n'
exit 1
fi
if [ -z "${outputs['power']}" ]; then
>&2 printf 'invalid config "#ETCDIR#/lights-out.conf": no power output defined.\n'
exit 1
fi
if [ -z "${server}" ]; then
>&2 printf 'invalid config "#ETCDIR#/lights-out.conf": no server name defined.\n'
exit 1
fi
case "$1" in
'get')
check_argument_count 2 "$@"
if [ -z "${inputs["$2"]}" ]; then
>&2 printf 'unknown input "%s"\n\n' "$2"
display_help
exit 1
fi
value=$(
gpio read "${inputs["$2"]}"
) || exit $?
echo $((1-value))
;;
'help')
display_help
;;
'init')
check_argument_count 1 "$@"
for input in "${inputs[@]}"; do
gpio mode "${input}" in || exit $?
gpio mode "${input}" up || exit $?
done
for output in "${outputs[@]}"; do
gpio write "${output}" 0 || exit $?
gpio mode "${output}" out || exit $?
done
;;
'name')
printf '%s\n' "${server}"
;;
'push')
check_argument_count 3 "$@"
if [ -z "${outputs["$2"]}" ]; then
>&2 printf 'unknown output "%s"\n\n' "$2"
display_help
exit 1
fi
gpio write "${outputs["$2"]}" 1 || exit $?
sleep "$3"
gpio write "${outputs["$2"]}" 0 || exit $?
;;
'turn')
if [ $# -ne 3 ] \
|| [ "x$3" != 'xon' ]; then
>&2 printf 'unknown command "%s"\n\n' "$*"
display_help
exit 1
fi
value=$(
"$0" get power
) || exit $?
if [ "${value}" -eq 0 ]; then
"$0" push power 0.1 || exit $?
fi
;;
*)
>&2 printf 'unknown command "%s"\n\n' "$1"
display_help
exit 1
;;
esac
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