DualShock 4 Check Script

#!/bin/bash

NC='\033[31;0m'
RED='\033[0;31;1m'
PUR='\033[0;35;1m'
YEL='\033[0;33;1m'
GRA='\033[0;37;1m'

if [ "$(id -u)" != "0" ]; then
   printf "\n\n${RED}== /!\ DO NOT USE ROOT! /!\ ==\n\n\${NC}" 2>&1
   exit 1
fi

## DS4 Check Script
## Sony DualShock 4 controller script for Linux
##
## /!\ THIS SCRIPT IS EXPERIMENTAL AND MAY REQUIRE TWEAKING TO GET THE RESULT YOU WANT /!\
##
## make sure you have ds4drv and xboxdrv installed on your system in order to use this.
## this script is to attempt to detect DualShock 4 controller when plugged into the system
## and automatically apply a config in ds4drv.conf, you can change LED bar color to any defined in the conf
## there are RGB color limitations to the LightBar on the DS4.
##
## List of tested valid LED colors for DualShock 4 written by me:
##  - https://github.com/chrippa/ds4drv/wiki/Light-Bar-Colors
##
## first it'll attempt to lock the ds4drv to its own PID so there is only 1 instance running at all times.
## if a PID file already exists it will exit, otherwise it'll create and lock to one. Check your $HOME/.cache
## directory for the log file labeled ds4drv.log. A secondary log may be contained within systems own Syslog
## detailing hidraw and udev events.
##
## if controller gets disconnected, it should hopefully unlock the PID file and remove it.
## if you do not have a ds4drv.conf you can get a template from here:
##    https://github.com/chrippa/ds4drv/blob/master/ds4drv.conf

pidfile=/tmp/ds4drv.pid

# check if process is already running
for pid in $(pidof -x $HOME/scripts/ds4check.sh $pidfile); do
    if [ $pid != $$ ]; then
      echo "[$(date "+%Y-%m-%d - %I:%M:%S %p")] : ds4check.sh : Process is already running with PID $pid\n" >> $HOME/.cache/ds4drv.log
      printf "\n${PUR}[$(date "+%Y-%m-%d - %I:%M:%S %p")]${NC} : ds4check.sh : ${RED}Process is already running with PID $pid\n\n${NC}" 2>&1
      exit 1
# if not running then run and apply config
      else  ( ds4drv --hidraw --config $HOME/.config/ds4drv.conf & disown );

      exit 0
    fi
done

##     === /!\/!\ DO NOT RUN AS ROOT /!\/!\ ===
## if you are having permission issues running this, you will need to create a udev rule for normal users.
## read here on how to create udev rule: https://github.com/chrippa/ds4drv


## just ignore this stuff below, it wasn't working out so well, but I may fix it eventually.
##
# remove PID file on exit... hopefully
#if ( set -o noclobber; echo "locked" > "$pidfile") 2> /dev/null; then
#   trap 'rm -f "$pidfile"; exit $?' INT TERM EXIT
#   echo "Locking succeeded" 2> $HOME/.cache/ds4drv.log;
#    rm -f "$pidfile"
#else
#   echo "Lock failed - exit" 2> $HOME/.cache/ds4drv.log;
#   exit 1
#fi

#trap "srm -rv -- '$pidfile'" EXIT >> $HOME/.cache/ds4drv.log

echo " "
echo "DualShock 4 Check Script"
echo " "