#!/bin/bash

# percentage bar

# usage: perc 44

# checks
#command -v awk >/dev/null 2>&1 || { echo "I need awk, exiting." >&2; exit 1; }
command -v bc >/dev/null 2>&1 || { echo "I need bc, exiting." >&2; exit 1; }

# input
perc="$1"

# config
chars="auto" # number or auto
if [[ "$chars" == "auto" ]]; then
    chars="$(tput cols)"
fi


# █ ░ ▓

prefil="░"
postfil=" "
poschar="░" ; pos="$poschar"


# main
faktor=$(echo "scale=2;$chars/100" | bc)

vol=$(echo "scale=0;($perc*$faktor+0.5)/1" | bc -l)

postloop=$(echo "$chars-$vol" | bc)

if (( vol == chars )); then
    postloop=0
fi

preloop=$(echo "$vol-1" | bc)

if (( vol == 0 )); then
    preloop=0
    postloop=$(echo "$chars-$vol-1" | bc)
fi

a=$(for i in $(seq 1 $preloop); do
    printf "%s" "$prefil" 
done)
b=$(printf "%s" "$pos")
c=$(for i in $(seq 1 $postloop); do
    printf "%s" "$postfil"
done)

# print out
printf "%s%s%s\n" "$a$b$c"

#end