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brightness's Issues

Suggestion: Add option to cycle through all brightness levels

Would it be possible to add an option to loop through each brightness level in increments of 10 up to 100 and then reset back to 0 and start again. For example if you specified the argument: "cycle" to the brightness command it would simply add the increment of 10 or a defined variable to the total brightness up to the max value (100) and then loop back to 0 when called again.

For example, I modified the code by adding a third argument "cycle", you could also add a cycle value variable instead of hard coding 10 if you did not want to increment by 10 each time:

b=$(xrandr --current --verbose | grep Brightness)       # Get current brightness
b=${b##*: }                                             # Remove "Brightness: "
b=${b#0.}                                               # Remove decimal point, e.g. 0.30 --> 30
level=10                                                # Brightness level increments

[[ $b == "1.0" ]] && b="100"    # if b = 1.0 then b = 100

case $1 in
        +*|-*)
                b=$((b $1))             # b=b+n,  b=b-n
        ;;
        [0-9]*)
                b=$1                    # b=n
        ;;
        cycle)
                b=$((b + $level))       # b=b+level
        ;;
        *)
                echo $b; exit
        ;;
esac

[[ $b -lt 0 ]] && b=0   # if b < 0 then b = 0

if [[ $b -gt 100 ]]; then
    b=0
fi

if [[ $b -eq 100 ]]; then
    b=1.0
else
    b=0.$b
fi

outputs=$(xrandr --current | awk '$2 == "connected" {print $1}')

for o in $outputs; do
    xrandr --output $o --brightness $b
done

Bash variable expansion doesn't work for me

The tool doesn't work for me.

$ brightness +10
/usr/local/bin/brightness: line 19: 81
	Brightness: 0.81
	Brightness: 0.81: syntax error in expression (error token is "Brightness: 0.81
	Brightness: 0.81")
/usr/local/bin/brightness: line 21: [[: 81
	Brightness: 0.81
	Brightness: 0.81: syntax error in expression (error token is "Brightness: 0.81
	Brightness: 0.81")
/usr/local/bin/brightness: line 22: [[: 81
	Brightness: 0.81
	Brightness: 0.81: syntax error in expression (error token is "Brightness: 0.81
	Brightness: 0.81")
/usr/local/bin/brightness: line 24: [[: 81
	Brightness: 0.81
	Brightness: 0.81: syntax error in expression (error token is "Brightness: 0.81
	Brightness: 0.81")
xrandr: unrecognized option 'Brightness:'
Try 'xrandr --help' for more information.
xrandr: unrecognized option 'Brightness:'
Try 'xrandr --help' for more information.
xrandr: unrecognized option 'Brightness:'
Try 'xrandr --help' for more information.

On closer inspection, this is where the script falls through for me. Why doesn't the transformation not work for multiple lines?

$ b=$(xrandr --current --verbose | grep Brightness) && echo "$b"
	Brightness: 0.81
	Brightness: 0.81
	Brightness: 0.81

$ echo "${b#*: }"
0.81
	Brightness: 0.81
	Brightness: 0.81

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