progress_bar

#!/usr/bin/env bash

BATCHSIZE=5

progress_bar() {
        local current=$1  
        local len=$2
        
        local bar_char='|'
        local empty_char=' '
        local length=50
        local perc_done=$((current * 100 / len))
        local num_bars=$((perc_done * length / 100))
       
        local i 
        local s='['
        for ((i = 0; i < num_bars; i++)); do
                  s+=$bar_char
        done 
        for ((i = num_bars; i < length; i++)); do
                s+=$empty_char
        done
        s+=']'
        
        echo -ne "$s $current/$len ($perc_done%)\r"
}

process-files() {
        local files=("$@")
       
        sleep .01
}

shopt -s globstar nullglob

echo 'finding files'
files=(./**/*cache)
len=${#files[@]}
echo "found $len files"

batchsize=5

for ((i = 0; i < len; i += BATCHSIZE)); do
        progress_bar "$((i+1))" "$len"
        process-files "${files[@]:i:BATCHSIZE}"
  
done 
progress_bar "$len" "$len"

echo