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#!/bin/sh
set -eu
get_b()
{
local b=
b=$(brightnessctl --class=backlight get) || return 1
printf '%.0f\n' $(printf \
'scale = 4; (7 * sqrt((2 - %d) * (%d - 3102))) / 1550\n' \
${b} ${b} | bc)
return 0
}
set_b()
{
local b="${1}"
shift 1
brightnessctl --class=backlight set $(printf '%.0f\n' \
$(printf 'scale = 4; 2 + (1 - sqrt(1 - (%d / 7)^2)) * 1550\n' \
${b} | bc)) || return 1
return 0
}
usage()
{
printf 'Usage: %s {-|+}\n' "${0}"
return 0
}
main()
{
local dir=
local b=
if [ ${#} -ne 1 ]; then
usage 1>&2
return 1
fi
dir="${1}"
shift 1
case "${dir}" in
-|+);;
*)
usage 1>&2
return 1
;;
esac
b=$(get_b) || return 1
: $((b += 1))
: $((b ${dir}= 1))
[ ${b} -gt 8 ] && b=8
[ ${b} -lt 1 ] && b=1
: $((b -= 1))
set_b ${b} || return 1
return 0
}
main "${@}"
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