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72 lines
3 KiB
Bash
72 lines
3 KiB
Bash
#!/bin/bash
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# this is a script to set my external monitor's brightness
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# to high (70% is my personal preference) or low (40% is my personal preference)
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# automatically according to day/night.
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# it uses ddcutil to access the monitor's settings and sunwait to know
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# if it's day or night. It expects a file in the following format in
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# the .config directory (the values should be according to location)
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## ~/.config/brightness-by-daylight.conf
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## Setup for brightness-by-daylight.sh
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# latitude="0.000000N"
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# longitude="0.000000E"
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# scriptdir=<location-of-this-script>
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# high=70
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# low=40
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# just run this script one manually to set it up to run perpetually (hopefully) using 'at'
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# (some distros don't come with 'at' preinstalled, so you might need to install 'at' and enable the 'atd' service.)
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# it might also be a good idea to add '<location-of-this-script> scheduler' to your DE's autostart list, or to '.profile' so that it launches on system login
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# (sometimes I forget to turn on the monitor when I start my PC, so this is better than having a crontab)
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# avoid running two concurrent processes
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[ "${BRTNESSLOCKER}" != "running" ] && exec env BRTNESSLOCKER="running" flock -en "/tmp/brightness-by-daylight.lock" "$0" "$@" || :
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# set location of the config file
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[ -z "$XDG_CONFIG_HOME" ] && confdir="$HOME/.config" || confdir="$XDG_CONFIG_HOME"
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# read from the config file
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if [ -f $confdir/brightness-by-daylight.conf ]; then
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source $confdir/brightness-by-daylight.conf
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else
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echo "No config file found!"
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echo "It should be located at [config-dir]/brightness-by-daylight.conf"
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exit
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fi
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# get sun status
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sun_status=$(sunwait poll $latitude $longitude)
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# check if we want to access the scheduler. If yes, create a schedule using `at`
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if [ "$1" == "scheduler" ]; then
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# get the timings for twilight events and current time
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sunrise_time=$(sunwait report 35.221050N 97.445938W | grep "Daylight:" | awk '{print $4}')
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sunset_time=$(sunwait report 35.221050N 97.445938W | grep "Daylight:" | awk '{print $6}')
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now_time=$(date "+%H:%M")
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# try to figure out if it's twilight right now, then need to adjust sun_status
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[ $sunrise_time == $now_time ] && sun_status="DAY"
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[ $sunset_time == $now_time ] && sun_status="NIGHT"
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# figure out the time of the next twilight
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[ $sun_status == "DAY" ] && time_next=$sunset_time || time_next=$sunrise_time
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# query all `at` tasks
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task_list=$(atq | grep $time_next | awk '{print $1}')
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# loop through all `at` entries to see if a task already exists
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flag=true
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for item in $task_list; do
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[ "$(at -c $item | sed 'x;$!d')" == "$scriptdir/brightness-by-daylight.sh scheduler" ] && flag=false
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done
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# create the schedule
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$flag && at -m $time_next <<<"$scriptdir/brightness-by-daylight.sh scheduler"
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fi
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# do the brightness adjustment using ddcutil
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[ $sun_status == "DAY" ] && target=$high || target=$low
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ddcutil setvcp 10 $target
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echo "Monitor brightness set to $target%, since it's $(echo $sun_status | tr '[:upper:]' '[:lower:]') time"
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