progressbar

#!/bin/bash

getColor() {
  case "$1" in
    black) color="0;30m";;
    red) color="1;31m";;
    green) color="1;32m";;
    blue) color="1;34m";;
    brown) color="0;33m";;
    yellow) color="1;33m";;
    white) color="1;37m";;
  esac
  echo "\033[$color"
}

printHelp() {
  echo
  echo 'usage: progress-bar [VALUE], VALUE percentage value, e.g. 10%, 50%, 100%, 110%'
  echo
  echo '  -h help'
  echo
  echo '  -l long output - allow more than 100%'
  echo '  -s [SIZE], SIZE number of ■ showed when value is 100 (default: 10)'
  echo '  -w [CHARACTER], CHARACTER characted that is being shown as progress bar tile (default: ■)'
  echo '  -a append numeric value after progress bar'
  echo '  -c [COLOR] black|red|green|blue|brown|yellow|white'
}

# DEFAULT CONFIG PARAMETERS
color=
allow_more_than_max=false
character=■
granularity=10
append_numeric_after_progressbar=false

# PARSE ARGS
while getopts 'als:c:w:h' OPT ${@:2}; do
  case "$OPT" in
    "l") allow_more_than_max=true ;;
    "s") granularity=$OPTARG ;;
    "w") character=$OPTARG ;;
    "c") color=$(getColor $OPTARG) ;;
    "a") append_numeric_after_progressbar=true ;;
    "h") printHelp; exit 1 ;;
    "?") printHelp >&2; exit 1 ;;

  esac
done


if [ -p /dev/stdin ]; then
  value=$(cat /dev/stdin | tr -d % | tr -d '\n')
else
  value=$(echo $1 | tr -d %)
fi


let step_size=100/$granularity
let num_of_progress_items=$value/$step_size

if [ "$color" ]
then
  printf $color
fi

printf '|'
for i in $(seq 0 $granularity)
do
  [[ $i -le $num_of_progress_items ]] && printf "$character" || printf ' '
done  

printf '|'

if [ "$allow_more_than_max" = true ] && [ $num_of_progress_items -gt $granularity ]
then
  let num_of_excess_items=$num_of_progress_items-$granularity
  for i in $(seq 1 $num_of_excess_items)
  do
    printf $character
  done  
fi

if $append_numeric_after_progressbar
then
  printf ' %d%%' $value
fi 

eval "tput sgr0" # reset color
echo