cprc

#!/bin/bash
# source this with bash

declare -A cprc_{write,read,pids}
cprc () {
  if [[ -v 'cprc_write[$1]' ]]; then
    echo cprc exists >&2
    return 1
  elif [[ -z $1 ]]; then
    echo invalid name >&2
    return 1
  else
    mkfifo "/tmp/cprc$1" &&
    exec {cprc_write[$1]}> >(eval "$2" > "/tmp/cprc$1") &&
    exec {cprc_read[$1]}< "/tmp/cprc$1" &&
    rm "/tmp/cprc$1"
    cprc_pids[$1]=$!
  fi
}

cprc_write () {
  if [[ ! -v 'cprc_write[$1]' ]]; then
    echo cprc does not exist >&2
    return 1
  else
    printf "%s\n" "$2" >&"${cprc_write[$1]}"
  fi
}

cprc_read () {
  if [[ ! -v 'cprc_write[$1]' ]]; then
    echo cprc does not exist >&2
    return 1
  else
    read -r -u "${cprc_read[$1]}"
  fi
}

trap 'kill "${cprc_pids[@]}"' EXIT






cprc foo 'echo "$(echo "foo: hello    world!")"; cat'
cprc bar 'echo "$(echo "bar: hello    world!")"; cat'
cprc_write foo "foo: hi world"
cprc_write bar "bar: hi world"
cprc_read bar
declare -p REPLY
cprc_read foo
declare -p REPLY
cprc_read foo
declare -p REPLY
cprc_read bar
declare -p REPLY