spinner.sh

#!/bin/bash
# Shows a spinner while another command is running. Randomly picks one of 12 spinner styles.
# @args command to run (with any parameters) while showing a spinner.
#       E.g. ‹spinner sleep 10›
Ye='\033[1;33m'; Wh='\033[1;37m'; Gr='\033[1;32m'; Re='\033[1;31m'; Cy='\033[1;36m'; Nc='\033[0m'
function shutdown() {
  tput cnorm # reset cursor
}
trap shutdown EXIT

function spinner() {
  # make sure we use non-unicode character type locale
  # (that way it works for any locale as long as the font supports the characters)
  local LC_CTYPE=C

  local pid="$!" # Process Id of the previous running command
#  set -x
  local narrate="$1"

  case $(($RANDOM % 2)) in
  0)
    local spin='-\|/'
    local charwidth=1
    ;;
  1)
    local spin='⠁⠂⠄⡀⢀⠠⠐⠈'
    local charwidth=3
    ;;
  esac

  local i=0
  tput civis # cursor invisible
  while kill -0 $pid 2>/dev/null; do
    local i=$(((i + $charwidth) % ${#spin}))
    local cnar=$((charwidth + ${#narrate})) # Character length + Narrate length
    #local cnar=$((cnar + 1))
  #  set +x
  #set +x
printf "%b %b" "${Wh}$narrate${Nc}" "${Cy}${spin:$i:$charwidth}${nc}"
    echo -en "\033[${cnar}D"

    sleep .1
  done
  tput cnorm
  wait $pid # capture exit code
  local rv=$?
  if [ "$rv" -eq 0 ]; then
    printf "%b" "${Wh}$narrate \e[1;32m\xE2\x9C\x94${Nc}\n"
  fi
  return $rv
}
# NOT REQUIRED BUT PUT JUST FOR AN EXAMPLE
{
  sleep 1
  sleep 1
  sleep 1
} > /dev/null 2>&1 &
spinner "$1"