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|
#!/bin/sh
set -eu
get_b()
{
# VCP 10 C 100 100
read -r vcp feat c val max <<-EOF
$(ddcutil -t getvcp 10)
EOF
printf '%s' ${val}
return 0
}
set_b()
{
local b=${1}
shift 1
ddcutil setvcp 10 ${b}
return 0
}
inc_b()
{
local d=${1}
shift 1
local b=
b=$(($(get_b) + ${d}))
if [ ${b} -gt 100 ]; then
b=100
elif [ ${b} -lt 0 ]; then
b=0
fi
set_b ${b}
}
tog_b()
{
local b=
b=$(get_b)
case ${b} in
[0-9] | [1-4][0-9])
set_b 100;;
[5-9][0-9] | 100)
set_b 0;;
esac
return 0
}
usage()
{
printf 'Usage: %s {<direction>|<value>}\n' "${0}"
printf '\n'
printf 'Where <direction> is any word beginning with (in any case):\n'
printf ' * "U" for up\n'
printf ' * "D" for down\n'
printf ' * "T" for toggle (between 0 and 100)\n'
printf 'And <value> is any integer between 0 and 100 inclusive\n'
return 0
}
main()
{
local dir=
if [ ${#} -ne 1 ]; then
usage 1>&2
return 1
fi
dir="${1}"
shift 1
case "${dir}" in
[Uu]*) inc_b 20;;
[Dd]*) inc_b -20;;
[Tt]*) tog_b;;
*[!0-9]* | '')
usage 1>&2
return 1
;;
*)
set_b ${dir}
esac
return 0
}
main "${@}"
|
