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brightness.sh
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brightness.sh
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#!/usr/bin/env bash
set -e
if ! command -v bc &> /dev/null
then
echo "bc command could not be found, it's needed to run this script."
exit
fi
get_display_info() {
xrandr --verbose | grep -m 1 -w "$1 connected" -A8 | grep "$2" | cut -f2- -d: | tr -d ' '
}
# cribbed from redshift, https://github.com/jonls/redshift/blob/master/README-colorramp
GAMMA_VALS=('1.0:0.7:0.4' # 3000K
'1.0:0.7:0.5' # 3500K
'1.0:0.8:0.6' # 4000K
'1.0:0.8:0.7' # 4500K
'1.0:0.9:0.8' # 5000K
'1.0:0.9:0.9' # 6000K
'1.0:1.0:1.0' # 6500K
'0.9:0.9:1.0' # 7000K
'0.8:0.9:1.0' # 8000K
'0.8:0.8:1.0' # 9000K
'0.7:0.8:1.0') # 10000K
get_gamma_index() {
for i in "${!GAMMA_VALS[@]}"; do
[[ "${GAMMA_VALS[$i]}" = "$1" ]] && echo "$i" && break
done
}
get_temp_for_gamma() {
idx=$(get_gamma_index "$1")
awk '{printf "%.1f", $1 / 10}' <<< "$idx"
}
get_gamma_for_temp() {
idx=$(awk '{printf "%d", $1 * 10}' <<< "$1")
echo "${GAMMA_VALS[$idx]}"
}
# gamma values returned by xrandr --verbose are somehow inverted
# https://gitlab.freedesktop.org/xorg/app/xrandr/issues/33
# this function corrects this bug by reverting the calculation
invert_gamma() {
inv_r=$(cut -d: -f1 <<< "$1")
inv_g=$(cut -d: -f2 <<< "$1")
inv_b=$(cut -d: -f3 <<< "$1")
r=$(awk '{printf "%.1f", 1/$1}' <<< "$inv_r" 2>/dev/null)
g=$(awk '{printf "%.1f", 1/$1}' <<< "$inv_g" 2>/dev/null)
b=$(awk '{printf "%.1f", 1/$1}' <<< "$inv_b" 2>/dev/null)
echo "$r:$g:$b"
}
get_gamma() {
invert_gamma "$(get_display_info "$1" 'Gamma: ')"
}
get_brightness() {
get_display_info "$1" 'Brightness: '
}
list_displays() {
echo 'displays:'
displist=''
connected=$(xrandr | grep -w connected | cut -f1 -d' ')
for display in $connected; do
brightness=$(get_brightness "$display")
gamma=$(get_gamma "$display")
temp=$(get_temp_for_gamma "$gamma")
displist+="$display brightness: $brightness gamma: $gamma temp: $temp"
displist+=$'\n'
done
echo "$displist" | column -t | sed 's/^/ /'
}
display_usage() {
script_name=$(basename "$0")
echo "Usage: $script_name op display [stepsize|value] [--temp]"
echo
echo 'arguments:'
echo ' op: '-' to decrease or '+' to increase brightness'
echo ' '=' to set brightness to a specific value'
echo ' display: name of a connected display to adjust'
echo ' stepsize: size of adjustment step (default 0.1)'
echo ' value: value to set (default 1.0 for brightness, 0.6 for color temperature)'
echo ' --temp: adjusts color temperature instead of brightness'
echo
list_displays
}
exec_op() {
if [ "$1" = '+' ]; then
NEWVAL=$(echo "$3 + $2" | bc)
elif [ "$1" = '-' ]; then
NEWVAL=$(echo "$3 - $2" | bc)
elif [ "$1" = '=' ]; then
NEWVAL=$2
fi
if [ "$(echo "$NEWVAL < 0.0" | bc)" -eq 1 ]; then
NEWVAL='0.0'
fi
if [ "$(echo "$NEWVAL > 1.0" | bc)" -eq 1 ]; then
NEWVAL='1.0'
fi
echo "$NEWVAL"
}
if [[ "$1" = '+' || "$1" = '-' || "$1" = '=' ]] && [[ -n "$2" ]]; then
OP=$1; DISP=$2; shift; shift
else
display_usage; exit 1
fi
if [[ "$1" =~ ^[0-9]+(.[0-9]+)?$ ]]; then
OPVAL=$1; shift
else
if [[ "$OP" = '=' ]]; then
if [[ "$1" = '--temp' ]]; then
OPVAL='0.6'
else
OPVAL='1.0'
fi
else
OPVAL='0.1'
fi
fi
CURRBRIGHT=$(get_brightness "$DISP")
if [[ ! "$CURRBRIGHT" =~ ^[0-9]+.[0-9]+$ ]]; then
echo "Error: Selected display $DISP has no brightness value!"
echo; list_displays; exit 1
fi
CURRGAMMA=$(get_gamma "$DISP")
if [[ ! "$CURRGAMMA" =~ ^[0-9].[0-9]:[0-9].[0-9]:[0-9].[0-9]$ ]]; then
echo "Error: Selected display $DISP has no gamma value!"
echo; list_displays; exit 1
fi
NEWBRIGHT="$CURRBRIGHT"
NEWGAMMA="$CURRGAMMA"
if [ "$1" = '--temp' ]; then
CURRTEMP=$(get_temp_for_gamma "$CURRGAMMA")
NEWTEMP=$(exec_op "$OP" "$OPVAL" "$CURRTEMP")
NEWGAMMA=$(get_gamma_for_temp "$NEWTEMP")
else
NEWBRIGHT=$(exec_op "$OP" "$OPVAL" "$CURRBRIGHT")
fi
xrandr --output "$DISP" --brightness "$NEWBRIGHT" --gamma "$NEWGAMMA"