.bin/redshift-check

   1 #!/bin/bash
   2
   3 usage() {
   4         cat <<-EOF
   5         Usage: ${0##*/} [options]
   6
   7         Options:
   8           -x, --reset    reset display to no redshift
   9         EOF
  10
  11         if [[ $# -eq 0 ]] ; then
  12                 exit 0
  13         else
  14                 printf '\nERROR: %s\n' "$*" >&2
  15                 exit 1
  16         fi
  17 }
  18
  19 rs() {
  20         exec redshift -m randr "$@"
  21 }
  22
  23 main() {
  24         cd /
  25         export DISPLAY=:0
  26
  27         local auth="${HOME}/.Xauthority"
  28         if [[ -e ${auth} ]]; then
  29                 export XAUTHORITY=${auth}
  30         fi
  31
  32         while [[ $# -gt 0 ]] ; do
  33                 case $1 in
  34                 -x|--reset) rs -x ;;
  35                 -h|--help) usage ;;
  36                 *) usage "Unknown option: $1" ;;
  37                 esac
  38         done
  39
  40         h=$(date +%H)
  41
  42         declare -A temps
  43         local min=2000
  44         temps=(
  45                 [20]=$(( min + 2000 ))
  46                 [21]=$(( min + 1500 ))
  47                 [22]=$(( min + 1000 ))
  48                 [23]=$(( min + 500 ))
  49                 [00]=$(( min ))
  50                 [01]=$(( min ))
  51                 [02]=$(( min ))
  52                 [03]=$(( min ))
  53                 [04]=$(( min ))
  54                 [05]=$(( min ))
  55                 [06]=$(( min + 500 ))
  56                 [07]=$(( min + 1000 ))
  57                 [08]=$(( min + 1500 ))
  58                 [09]=$(( min + 2000 ))
  59         )
  60
  61         t=${temps[${h}]}
  62         if [[ -z ${t} ]]; then
  63                 rs -x
  64         else
  65                 rs -O ${t}k
  66         fi
  67 }
  68 main "$@"