sh spinner.sh

Posted 2021-05-07

#!/bin/sh

spinner()
{
    local pid=$1
    local delay=0.1
    local spinners=(⠋ ⠙ ⠹ ⠸ ⠼ ⠴ ⠦ ⠧ ⠇ ⠏)
    local spinners_count=${#spinners[@]}
    local spinstr='⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏'
    local infotext=$2
    local counter=0
    while [ "$(ps a | awk '{print $1}' | grep $pid)" ]; do
        let "counter++"
        printf "%s %s" ${spinners[$(($counter % $spinners_count))]} "$infotext"
        sleep $delay
        printf "\b\b\b\b"
	for i in $(seq 1 ${#infotext}); do
	    printf "\b"
	done
    done
    printf "    "
    for i in $(seq 1 ${#infotext}); do
        printf " "
    done
    printf "\b\b\b\b"
    for i in $(seq 1 ${#infotext}); do
        printf "\b"
    done
}

result=`sleep 10 && echo 123` &

spinner $! "loading..."
echo $result