#!/usr/bin/env zsh
sleep 10 &!
pid=$! # Process Id of the previous running command

spin='⠋⠙⠚⠞⠖⠦⠴⠲⠳⠓'

i=0
while kill -0 $pid 2>/dev/null; do
    i=$(((i + 1) % 10))
    printf "$fg[magenta]\r${spin:$i:1}"
    printf "$fg[white] Waiting..."
    sleep .1
done
printf "\r$fg[green]✓\n"