#!/bin/bash 

# helper
if [ -z ${1} ] || [ -z ${2} ] || [ "--help" == "${1}" ]; then
    echo
    echo "Usage: $0 [speed in second] [how many cycles] [cursorup] [bash clear]"
    echo
    echo "[cursorup]: 0, no tput cuu1; 1, yes tput cuu1"
    echo "[bash clear]: 0, tput clear; 1, clear; command for each cycle"
    echo "[bash clear]: 2, tput clear; 3, clear; command for each echo"
    echo
    exit 1
fi

# parameters
pos=0
sec=$1
how=$2
cur=$3
bas=$4

# test
clr='tput clear'
cuu='tput cuu1'

# function
clearEcho ()
{
    ori=${1}
    num=$(( ori + 1 ))
    if [ $bas -eq $ori ]; then
	$clr
    else
	if [ $bas -eq $num ]; then 
	    clear
	fi
    fi
    if [ $bas -eq $ori ] || [ $bas -eq $num ]; then
	echo cycle: $pos
    fi
}

# main
while [ $pos -lt $how ]
do
    clearEcho 0
    for i in $(echo "| / - \\")
    do
	clearEcho 2
	echo $i
	if [ $cur -gt 0 ]; then
	    $cuu
	fi
	sleep $sec
    done
    let pos++
done