40 lines
1.2 KiB
Bash
Executable File
40 lines
1.2 KiB
Bash
Executable File
#!/bin/sh
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# A small script manually writing into the /sys/class/backlight/* files
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# If multiple go through all and apply changes/printout status
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# if no first argument is given prints out current status
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# else: apply changes (+/- -> relative, only number: -> absolute)
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# numbers in percentages
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for backlight in "/sys/class/backlight/"*; do
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max_brightness=$(cat $backlight/max_brightness)
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current_brightness_abs=$(cat $backlight/brightness)
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current_brightness_rel="$(echo "$current_brightness_abs * 100 / $max_brightness" | bc -l | xargs printf '%.0f')"
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# For statusbar
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if [ -z $1 ]; then
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echo "☀️$current_brightness_rel%"
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# continue as relative changes can result in differing brightness for multiple backlights
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continue
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fi
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max(){
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echo $(( $1 > $2 ? $1 : $2 ))
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}
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min(){
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echo $(( $1 < $2 ? $1 : $2 ))
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}
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limit(){
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echo $(min $(max $1 0) 100)
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}
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if echo $1 | grep -q '^[+-]'; then
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new_brightness_rel=$(limit $(echo $current_brightness_rel $1 | bc))
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else
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new_brightness_rel=$(limit $1)
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fi
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new_brightness_abs=$(echo "($new_brightness_rel * $max_brightness)/ 100" | bc)
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echo "$new_brightness_abs" | sudo tee $backlight/brightness > /dev/null
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done
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[ -z $1 ] ||
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pkill -RTMIN+2 dwmblocks
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