Shell runner for capturing output and exit code.

shell_runner.sh

#!/bin/sh

# Capture node output and status code for passing commands back to shell.
# This snippet is useful for running a node script that outputs a command 
# to run after it exits in situations where node is conflicting with 
# tty or environment settings.

main() {
  local tempout; tempout=`mktemp -t tmp.out` || exit 1
  local statusfile; statusfile=`mktemp -t tmp.status` || exit 1
  local exitcode;

  # Send stdout to $tempout for later parsing
  { node --harmony cli.js $@; echo $? > $statusfile; } | tee $tempout
  exitcode=`cat $statusfile`

  # Run script in background and wait for it to exit
  # eval node --harmony cli.js $@ > $tempfile &
  # for job in `jobs -p`; do
  #   # Set exitcode if not 0
  #   wait $job || let "exitcode=$?"
  # done

  # This is a bit hacky but it works.
  # For commands that need to run in the current shell,
  # the CLI prints "EXEC::$CMD" and returns code=2.
  if [ "$exitcode" = 2 ]; then
    local output; output=`tail -n1 $tempout`
    if [ ! "${output##EXEC::*}" ]; then
      output=`echo $output | sed -e 's/^EXEC:://'`
      printf "\nRUNNING COMMAND >> $output\n"
      eval $output
    fi
  fi
}

main "$@"