blob: 7aa08017142142408ec575e58450b79e50aa8241 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
#!/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
set_b $((${b} ${dir} 1)) || return 1
return 0
}
main "${@}"
|
