#!/bin/bash
# getProgressString <TOTAL ITEMS> <FILLED LOOK> <NOT FILLED LOOK> <STATUS>
# For instance:
# $ getProgressString 10 "#" "-" 50
# #####-----
# Note: if you want to use | in your progress bar string you need to change the delimiter in the sed commands

ITEMS="$1" # The total number of items(the width of the bar)
FILLED_ITEM="$2" # The look of a filled item
NOT_FILLED_ITEM="$3" # The look of a not filled item
STATUS="$4" # The current progress status in percent

# calculate how many items need to be filled and not filled
FILLED_ITEMS=$(echo "((${ITEMS} * ${STATUS})/100 + 0.5) / 1" | bc)
NOT_FILLED_ITEMS=$(echo "$ITEMS - $FILLED_ITEMS" | bc)

# Assemble the bar string
msg=$(printf "%${FILLED_ITEMS}s" | sed "s| |${FILLED_ITEM}|g")
msg=${msg}$(printf "%${NOT_FILLED_ITEMS}s" | sed "s| |${NOT_FILLED_ITEM}|g")
echo "$msg"