progress.sh

progress ()
{
  local pid="${1}"
  local delay='0.1'
  local indicator='┤┘┴└├┌┬┐'
  # local indicator='▉▊▋▍▎▏▎▍▋▊▉'
  # local indicator='▖▘▝▗'
  local indicator='⣾⣽⣻⢿⡿⣟⣯⣷'
  # local indicator='⠁⠂⠄⡀⢀⠠⠐⠈'
  # local indicator='.oO@*'
  # local indicator='▁▂▃▅▆▇▇▆▅▃▂▁'
  while kill -0 "${pid}" 2> /dev/null
  do
    local progress="${indicator}"
    while [ -n "${progress}" ]
    do
      echo -en "\r${2}: ${progress::1}\r"
      sleep "${delay}"
      progress=${progress:1}
    done
  done
  echo -e "\r${2}: ✓"
  wait ${pid}
  return $?
}