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153 lines
4.5 KiB
Bash
Executable file
153 lines
4.5 KiB
Bash
Executable file
#!/bin/sh
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# Parse arguments
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# ------------------------------------------------------------------------------------
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BRIGHTNESS_DIR="/sys/class/backlight/*"
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SEND_NOTIFICATION=0
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URGENCY="normal"
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INCREASE=0
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DECREASE=0
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SET=0
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BRIGHTNESS=0
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while [ "$1" ]; do
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case "$1" in
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-h | --help)
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cat << EOF
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brightness is a cli tool that for displaying or modifying screen brightness.
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Options:
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-h | --help: Display this message
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-n | --notification: Produce a desktop notification with brightness info
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-N | --no-notification: Don't produce a desktop notification with brightness info
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-u | --urgency [URGENCY]: Pass over notify-send urgency attribute (default: normal)
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-i | --increase [BRIGHTNESS]: Increase the brightness by given amount
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-d | --decrease [BRIGHTNESS]: Decrease the brightness by given amount
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-s | --set [BRIGHTNESS]: Set new brightness level
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-p | --path [DIR_PATH]: Path to brightness directory (default: /sys/class/backlight/*)
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Valid values:
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URGENCY: low, normal, critical
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DIR_PATH: Valid path to a directory
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BRIGHTNESS:
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specific value - Example: 10
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percentage value - Example: 10%
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EOF
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exit 0
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;;
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-n | --notification)
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SEND_NOTIFICATION=1
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;;
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-N | --no-notification)
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SEND_NOTIFICATION=0
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;;
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-u | --urgency)
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URGENCY="$2"
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shift
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;;
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-i | --increase)
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INCREASE=1
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BRIGHTNESS="$2"
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shift
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;;
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-d | --decrease)
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DECREASE=1
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BRIGHTNESS="$2"
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shift
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;;
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-s | --set)
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SET=1
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BRIGHTNESS="$2"
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shift
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;;
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-p | --path)
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BRIGHTNESS_DIR="$2"
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shift
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;;
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* )
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echo "Unknown argument '$1', use -h or --help for help"
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exit 1
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;;
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esac
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shift
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done
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# Define constants based on parsed arguments
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# ------------------------------------------------------------------------------------
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BRIGHTNESS_FILE="$BRIGHTNESS_DIR/brightness"
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BRIGHTNESS_MAX="$(cat $BRIGHTNESS_DIR/max_brightness)"
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# Helper functins
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# ------------------------------------------------------------------------------------
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# Send brightness level desktop notification, showing the given brightness level
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# as progress bar, along with given message.
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# $1 - brightness level (number 0-100)
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# $2 - message (notification body)
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send_brightness_notify() {
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percent_brightness="$1"
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msg="$2"
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notify-send \
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--app-name=brightness \
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--urgency="$URGENCY" \
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-h int:value:$percent_brightness \
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-h string:synchronous:brightness \
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"brightness" "$msg"
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}
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# Set brightness to given absolute value
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# $1 - brightness absolute value
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set_brightness() {
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# there should be sudo config allowing this command without password
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echo "$1" | sudo tee $BRIGHTNESS_FILE >/dev/null
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}
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# Main Logic
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# ------------------------------------------------------------------------------------
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# Determine the absolute new brightness level
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if [ $INCREASE -eq 1 ] || [ $DECREASE -eq 1 ] || [ $SET -eq 1 ]; then
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# If we're dealing with percentages, change to absolutes
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if echo "$BRIGHTNESS" | grep -qE '%$'; then
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numeric=$(echo "$BRIGHTNESS" | sed 's/.$//')
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absolute=$(echo "($BRIGHTNESS_MAX / 100) * $numeric" | bc -l)
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BRIGHTNESS=$(printf "%.0f" $absolute)
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fi
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# Get the new requested absolute brightness
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if [ $SET -eq 1 ]; then
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new_brightness=$BRIGHTNESS
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elif [ $DECREASE -eq 1 ]; then
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cur_brightness=$(cat $BRIGHTNESS_FILE)
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new_brightness=$(($cur_brightness - $BRIGHTNESS))
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else
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cur_brightness=$(cat $BRIGHTNESS_FILE)
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new_brightness=$(($cur_brightness + $BRIGHTNESS))
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fi
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# Ensure we respect max/min boundaries
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if [ $new_brightness -lt 0 ]; then
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new_brightness=0
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elif [ $new_brightness -gt $BRIGHTNESS_MAX ]; then
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new_brightness=$BRIGHTNESS_MAX
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fi
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# Update the brightness
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set_brightness $new_brightness
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fi
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cur_brightness=$(cat $BRIGHTNESS_FILE)
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percent_brightness=$(echo "($cur_brightness / $BRIGHTNESS_MAX) * 100" | bc -l)
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percent_brightness_2f=$(printf "%.2f" $percent_brightness)
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percent_brightness_rounded=$(printf "%.0f" $percent_brightness)
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if [ $SEND_NOTIFICATION -eq 1 ]; then
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send_brightness_notify "$percent_brightness_rounded" "Level: $percent_brightness_rounded"
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fi
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echo "Brightness: ${percent_brightness_2f}% (absolute: $cur_brightness)"
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