Bash spinner

spin()
{
    local \
        before_msg="$1" \
        after_msg="$2"
    local    spinner
    local -a spinners
    spinners=(⠋ ⠙ ⠹ ⠸ ⠼ ⠴ ⠦ ⠧ ⠇ ⠏)

    # hide cursor
    tput civis

    while true
    do
        for spinner in "${spinners[@]}"
        do
            if [[ -f $TMPFILE ]]; then
                rm -f $TMPFILE
                tput cnorm
                return 1
            fi
            sleep 0.05
            printf " $fg[white]$spinner$reset_color  $before_msg\r" 2>/dev/null
        done

        echo "$jobstates" \
            | awk '
            /[0-9]+=/ {
                jobs[++job_count] = $0
            }
            END {
                for (i = 1; i <= job_count; i++) {
                    print(jobs[i])
                }
                exit job_count == 0
            }' \
                | xargs test -z && break
    done

    if [[ -n $after_msg ]]; then
        printf "\033[2K"
        printf " $fg_bold[blue]\U2714$reset_color  $after_msg\n"
    fi 2>/dev/null

    # show cursor
    tput cnorm || true
}