30 lines
760 B
Bash
Executable File
30 lines
760 B
Bash
Executable File
#!/usr/bin/env bash
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BACKLIGHT="/sys/class/backlight"
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DEV=$(ls "$BACKLIGHT" 2>/dev/null | head -n1)
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gen_output() {
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if [ -z "$DEV" ]; then
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echo '{"percent":0,"available":false}'
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return
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fi
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max=$(cat "$BACKLIGHT/$DEV/max_brightness")
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cur=$(cat "$BACKLIGHT/$DEV/actual_brightness" 2>/dev/null || cat "$BACKLIGHT/$DEV/brightness")
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percent=$(awk -v c="$cur" -v m="$max" 'BEGIN{print int(c/m*100+0.5)}')
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printf '{"percent":%d,"available":true}\n' "$percent"
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}
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case "$1" in
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set)
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[ -z "$DEV" ] && exit 0
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brightnessctl -d "$DEV" set "${2}%" -q 2>/dev/null
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;;
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*)
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gen_output
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[ -z "$DEV" ] && exit 0
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udevadm monitor --udev --subsystem-match=backlight 2>/dev/null | while read -r _; do
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gen_output
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done
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;;
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esac
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