#!/bin/bash
# Author: x4x
# Create a job queue for bash.

set -o errexit
set -o nounset

FIFO=/tmp/shfifo0
n=0
MARK='\033[0;35m'
NC='\033[0m' # No Color

trap "rm -f $FIFO" EXIT

if [[ ! -p $FIFO ]]; then
    mkfifo $FIFO
fi

# read whatever from the named pipe.
while read job < $FIFO
do
  n=$((n+1))
  if [[ $job = 'quit' ]]; then
    echo -e "${MARK}Done processing $n jobs${NC}"
    exit
  fi
  echo -e "${MARK}running job $n: ${NC} $job"
  {
      (eval '$job') | sed -e 's/^/'"$n> /" &
      # catch errors
  } || {
      echo -e "${MARK}An Error happend${NC}"
  }
done

# use:
# run in other shell a piped comand to the FIFO
# echo "ytd " > /tmp/shfifo0
# #alias ytd='youtube-dl -x --audio-format mp3 '
# function ytmq { echo "youtube-dl -x --audio-format mp3 $1"  > /tmp/shfifo0; }