progreshbar

#!/bin/bash

usage(){
    echo '
    Usage:
        $0 [-p] [--no-trim] iteration_number total [item_name]

    Example:
    list=$(find .)
    list_count=$(echo "$list"|wc -l)
    i=1
    for l in $list; do
      progreshbar -p $i $list_count $l
      ((i++))
    done
    '
    exit 1
}

template='[ ${progress_bar_prefix}=>${progress_bar_suffix}] ${progress_bar_percentage} $iteration / $total $item'
# Export templated values
export progress_bar_prefix
export progress_bar_suffix
export progress_bar_percentage
export iteration
export total
export item

percentage=false
[ "$1" == "-p" ] && { percentage=true; shift 1; }

trim=true
[ "$1" == "--no-trim" ] && { trim=false; shift 1; }

iteration=$1
total=$2
item=$3
progress_bar_num=$iteration
progress_bar_max=$total

[ "$iteration" ] || usage
[ "$total" ]     || usage

if [ "$percentage" == "true" ]; then
    progress_bar_num=$(((100*$iteration)/$total))
    progress_bar_max=100
    export progress_bar_percentage="${progress_bar_num}%"
fi

progress_bar_rest=$(($progress_bar_max-$progress_bar_num))
progress_bar_prefix=$(printf %${progress_bar_num}s)
progress_bar_suffix=$(printf %${progress_bar_rest}s)

if [ "$trim" == "true" ]; then
    num=$(( $(tput cols) - $(echo -n "$template" | envsubst | wc -c) - 1 ))
    item=${item:0:$num}
fi

echo -n $'\r\033[K'
echo -n "$template" | envsubst
[ $iteration == $total ] && echo ""