#!/bin/bash

function __keep_preexec {
  KEEP_META_command="$1"
  KEEP_META_tty=${KEEP_META_tty:-$(tty)}
}

function __keep_preexec_init {
  local found=false
  local f
  for f in "${preexec_functions[@]}"; do
    if [[ $f = __keep_preexec ]]; then
      found=true
      break
    fi
  done

  if [[ $found = false ]]; then
    preexec_functions+=(__keep_preexec)
  fi
}

function keep {
  (
    if [[ $BASH_SUBSHELL -le 2 ]]; then
      export KEEP_META_command
    fi

    export KEEP_META_tty

    exec keep "$@"
  )
}

function @ {
  keep --save "$@"
}

function @@ {
  keep --get "$@"
}

__keep_preexec_init