xiringuito/helpers/wait_for

#!/usr/bin/env bash
#
# Waits TIMEOUT seconds, makes probes every second, until COMMAND returns
#
OUTPUT=/dev/null
if [[ "${DEBUG}" == "true" ]]; then
  set -x
  OUTPUT=/dev/stderr
fi

function die(){
  [[ "${WAIT_VERBOSE}" == "true" ]] && echo
  echo "[ ERROR ]"
  echo "${@}"
  exit 1
}

function signal_progress(){
  [[ "${WAIT_VERBOSE}" == "true" ]] && echo -n "="
}

function success(){
  [[ "${WAIT_VERBOSE}" == "true" && ${WAIT_TIME} -gt 0 ]] && echo "|"
  exit 0
}

[[ ${#} -ge 3 ]] || die "Usage: wait_for true|false TIMEOUT COMMAND"

[[ ${1} == "true" || ${1} == "false" ]] || die "'true' or 'false' for the first argument please!"

declare -r RESOLUTION=${1}; shift
declare -r TIMEOUT=${1}; shift
declare -r COMMAND="${@}"

WAIT_TIME=0
while [[ ${WAIT_TIME} -lt ${TIMEOUT} ]]; do
  bash -c "${COMMAND}" >${OUTPUT}
  RETVAL=${?}

  if [[ "${RESOLUTION}" == "true" ]]; then
    [[ ${RETVAL} -eq 0 ]] && success
  else
    [[ ${RETVAL} -ne 0 ]] && success
  fi

  sleep 1
  let WAIT_TIME+=1
  signal_progress
done


if [[ "${RESOLUTION}" == "true" ]]; then
  FAIL_STATE=fails
else
  FAIL_STATE=succeeds
fi
die "\"${@}\" still ${FAIL_STATE} after ${TIMEOUT} seconds"