#!/bin/bash

muteTimeMS=200

echo 0 > .lastKPTime
checkKeyPress() {
  echo "capturing input"
  xinput test-xi2 --root | grep --line-buffered RawKeyPress |
  while read -r line; do
    lastPressTime=`cat .lastKPTime`
    deviceID=`pactl list short sources | grep RUNNING | head -n 1 | cut -f1`
    muted=$(pactl list sources | grep '^[[:space:]]Mute:' | head -n $deviceID | tail -n 1 | xargs | cut -d':' -f2 | xargs)

    # Skip if the user has muted themsevles
    if [ "${lastPressTime}" = "0" ] && [ "$muted" = "yes" ]; then
      continue
    fi

    echo `date +%s%N | cut -b1-13` > .lastKPTime

    if [ $muted = "yes" ]; then
      continue
    fi

    pactl set-source-mute $deviceID true
    echo "muted"
  done
}
checkKeyPress &

while true
do
  sleep .1
  deviceID=`pactl list short sources | grep RUNNING | head -n 1 | cut -f1`
  muted=$(pactl list sources | grep '^[[:space:]]Mute:' | head -n $deviceID | tail -n 1 | xargs | cut -d':' -f2 | xargs)
  if [ $muted != "yes" ]; then
    continue
  fi

  lastPressTime=`cat .lastKPTime`
  if [ "${lastPressTime}" = "0" ]; then
    continue
  fi

  currentTimeMS=`date +%s%N | cut -b1-13`
  timeSinceLastKP=`expr $currentTimeMS - $lastPressTime`
  if (( timeSinceLastKP > $muteTimeMS )); then
    pactl set-source-mute $deviceID false
    echo "unmuting"
    echo 0 > .lastKPTime
  fi
done