#!/usr/bin/env bash
# Calm a process down
# NEEDS_WORK: cleanup
#  calm <pid> == only one process
#  calm <bin> == all processes that match query
#  calm * == if used in proc or a folder with just PID files, if not you will get an error
#  calm <pid> <bin> .... OK
# set's NICE value to 0
# need sudo

LD_INTERNAL=1
. $(dirname $(realpath $0))/daisy.source

pids=$@

errorFn()
{
  echo calm: Invalid operation or no such PID/process \(\"$(echo "$pids" | tr '\n' ' ' | cut -c -20)...\"\)
  exit
}

for pid in $pids
do
  # Process to PID in elegant way
  newpids=$(pidof "$pid")
  if [ "$newpids" ]
  then
    binary=$pid
    pid=$newpids
  else
    newbins=$pid
    binary=$(ps -p "$pid" -o comm= 2>/dev/null )
    if [ $? != 0 ]
    then
      errorFn
    fi
  fi

  echo Calming down $pid \("$binary"\)...
  sudo renice -n 0 -p $pid;
done
