#!/bin/bash
# see https://yangtze736.github.io/%E6%8A%80%E6%9C%AF/2018/05/02/shell-tips/
#
function waiting() {
    i=0
    while [ $i -le 100 ]
    do
        for j in '\\' '|' '/' '-'
        do
            printf "%c%c%c%c%c waiting %c%c%c%c%c\r" \
            "$j" "$j" "$j" "$j" "$j" "$j" "$j" "$j" "$j" "$j"
            sleep 0.1
        done
        let i=i+4
    done
}

function progress_bar() {
    i=0
    str=""
    arry=("\\" "|" "/" "-")
    while [ $i -le 100 ]
    do
        let index=i%4
        printf "[%-100s] %d %c\r" "$str" "$i" "${arry[$index]}"
        sleep 0.1
        let i=i+1
        str+="#"
    done
    echo ""
}

function progress_bar2() {
    i=0
    str=""
    arry=("|" "/" "-" "\\")
    while [ $i -le 100 ]
    do
        let index=i%4
        printf "%3d%% %c%-20s%c\r" "$i" "${arry[$index]}" "$str" "${arry[$index]}"
        sleep 0.2
        let i=i+5
        str+="*"
    done
    echo ""
}

progress_bar