#!/bin/sh

# redscript: uses redshift to change screen color temperature to reduce blue 
# light, set it back to default, or even manually set it.
# x1phosura

# redshift -P -O <temperature number>
# Note: temperature 1000 - 25000, default is 6500

if [ "$1" = "" ]; then
    redshift -P -O 6500  # default: revert back to neutral color temperature
elif [ "$1" = "MID" ]; then
    redshift -P -O 4200
elif [ "$1" = "LOW" ]; then
    redshift -P -O 3000
elif [ "$1" = "SET" ]; then
    redshift -P -O "$2"  # set color temperature manually
else
    printf "Options:\n"
    printf "    <nothing>\n    MID\n    LOW\n    SET <number 1000-25000>\n"
fi