#!/usr/bin/env bash

set -eo pipefail

# SYNTAX:
#   catch STDOUT_VARIABLE STDERR_VARIABLE COMMAND [ARG1[ ARG2[ ...[ ARGN]]]]
catch() {
  {
    IFS=$'\n' read -r -d '' "${1}";
    IFS=$'\n' read -r -d '' "${2}";
    (IFS=$'\n' read -r -d '' _ERRNO_; return ${_ERRNO_});
  } < <((printf '\0%s\0%d\0' "$(((({ shift 2; "${@}"; echo "${?}" 1>&3-; } | tr -d '\0' 1>&4-) 4>&2- 2>&1- | tr -d '\0' 1>&4-) 3>&1- | exit "$(cat)") 4>&1-)" "${?}" 1>&2) 2>&1)
}
# " This line fixes my syntax highlighting 

# Only log rails generator commands (for now)
should_log() {
  cmd=$(basename ${1})
  if [ "${cmd}" == "rails" ];then
    case ${2} in
      g | generate | d | delete)
        echo 0
      ;;
      *)
        echo 1
      ;;
    esac
  else
    echo 1
  fi
}

# Execute catching output and error seperately
catch output errors "$@"
exit_code=$?

# Show the command's output
cat <<< ${output}

if [ ${exit_code} -eq 0 ] && [ -z "${errors}" ];then
  # Was the command interesting?
  log_it=$(should_log $@)
  if [ ${log_it} -eq 0 ]; then
    # Log date, command and output
    comment="# $(date)"
    msg="$@"
    printf "${comment}\n${msg}\n" >> /app/config/generation.sh
    cat <<< "${output}" | sed -e 's/^#*/# /' >> /app/config/generation.sh
  fi
else
  # Show the error.
  # TODO: Ask user if the command should be stored anyways
  echo "The command exited with \"${exit_code}\" wrote the following to STDERR:"
  cat <<< "${errors}"
fi