#!/bin/bash
# Script to adjust dpms settings when running certain programs,
# that don't use fullscreen, but should not be "blanked" in between.
# Programs are defined in separate config file ~/.config/dpms
# Run as timed user script (i.e. adjust_dpms@.service) with systemd 
# from /etc/systemd/system/timer-minutely.target.wants

export DISPLAY=:0.0

config="/home/$(whoami)/.config/dpms"
blankoff=0

# check for config file existence
if [[ -f $config ]];then
  . /home/dave/.config/dpms
else
  echo "Config file not readable $config"
  exit 1
fi

# loop all programs and check for running instances
for i in "${programs[@]}"
do
  pid=$(pidof -x $i)
  re='^[0-9]+$'
  if  [[ $pid =~ $re ]]; then
    echo "$i running ($pid)"
    blankoff=1
  fi
done

# if valuable programs are running, don't use screen blanking
if [ $blankoff -gt 0 ]; then
  echo "Some program requires screensaver to be off."
  # print currently set values for screensaver timeout to tmp file
  echo "s $(xset q|grep timeout|awk '{print $2}') $(xset q|grep timeout|awk '{print $4}')" > $adjust_dpms
  echo "dpms $(xset q|grep Standby|awk '{print $2}') $(xset q|grep Standby|awk '{print $4}') $(xset q|grep Standby|awk '{print $6}')" >> $adjust_dpms
  # disable screensaver and dpms
  xset s off
  xset -dpms
else
  xsetq=$(xset q|grep timeout|awk '{print $2}')
  # if the timeout is still 0, set it to its former value, or just switch on screensaver/dpms again
  if [[ $xsetq -eq 0 ]];then
    if [[ -f "$adjust_dpms" ]];then
      xset $(head -n1 $adjust_dpms)
      xset $(tail -n1 $adjust_dpms)
      rm -rf $adjust_dpms
    else
      xset +dpms
      xset s on
    fi
  fi
fi