Bash Progress Bar

progress-bar.sh

#!/bin/bash

# Bash Progress Bar: https://gist.github.com/F1LT3R/fa7f102b08a514f2c535

# Function to draw progress bar
progressBar () {
	local __message="";
	local -i __current=0 __total=100;
	local -i __progress_bar_width=50;
	local -i __highlight_items=0 __highlighted=0;
	local -i __percentage=0;
	local -i __fill=0 empty=0;
	local fill_char="=" empty_char=" " highlight_char="=";
	local fill_color="\033[1m" empty_color="\033[0m" highlight_color="\033[1;90m" reset_color="\033[0m";
 
	OPTIND=1;
	POSITIONAL=();
	while [[ $# -gt 0 ]]; do
		case $1 in
			-c | --current)
				__current="$2";
				shift 2;
			;;
			--highlight)
				__highlight_items="$2";
				shift 2;
			;;
			-t | --total)
				__total="$2";
				shift 2;
			;;
			-w | --width)
				__progress_bar_width="$2";
				shift 2;
			;;
			-m | --message)
				__message="$2";
				shift 2;
			;;
			-\? | -h |--help)
				# Call to usage function goes here
				return 0;
			;;
			-*)
				echo "Unknown option: $1" >&2;
				return 1;
			;;
			*)
				POSITIONAL+=("$1");
				shift;
			;;
		esac;
	done;
	[[ ${#POSITIONAL[@]} -gt 0 ]] && set -- "${POSITIONAL[@]}";

	[[ -z "${__current}" ]] && { __current=$1; shift; };
	[[ -z "${__total}" ]] && { __total=$1; shift; };

	__progress_bar_width=$((__progress_bar_width - 8 - 2 - 1)); # 8=percentage, 2=[] and 1=space
	if [[ -n "${__message:-}" ]]; then
		# __progress_bar_width=$((__progress_bar_width - 3 - ${#__message})); # 3 for the separator (" - ")
		__progress_bar_width=$(awk 'BEGIN {print int(('"${__progress_bar_width}"' / 1.5))}');
	fi;
  
	# Calculate number of fill/empty slots in the bar
	__fill=$((__current * __progress_bar_width / __total));
	if ((__fill > __progress_bar_width)); then
		__fill=${__progress_bar_width};
	fi
	empty=$((__progress_bar_width - __fill));

	if ((__highlight_items > 0 && __highlight_items <= __current)); then
		__highlighted=$((__highlight_items * __progress_bar_width / __total));
		if ((__highlighted > __progress_bar_width)); then
			__highlighted=0;
		fi
		__fill=$((__fill - __highlighted));
		empty=$((__progress_bar_width - __fill - __highlighted));
	fi

	# Percentage Calculation
	__percentage=$(((__current - __highlight_items) * 100 / __total));
	
	if (( __percentage > 100 )); then
		__percentage="100.00";
	fi

	# Output to screen
	screen="$(
		printf "\33[2K\r[";
		
		(( __fill > 0 )) && printf "${fill_color}%*s${reset_color}" "${__fill}" " " | tr " " "${fill_char}" | sed "s/\(.*\)${fill_char}/\1>/g";
		
		if ((__highlighted > 0)); then
			printf "${highlight_color}%*s${reset_color}" "${__highlighted}" " " | tr " " "${highlight_char}" | sed "s/\(.*\)${highlight_char}/\1>/g";
		fi
		
		(( empty > 0 )) && printf "${empty_color}%*s${reset_color}" "${empty}" " " | tr " " "${empty_char}";
		
		printf "] %6.2f%%" "${__percentage}";

		if [[ -n "${__message}" ]]; then
			printf -- " - %s" "${__message}";
		fi;
	)";
	printf "%s" "${screen}"
}


for ((index=1; index <= 10; index++)); do
	# Intermediate step (for example, data fetching)
	progressBar --highlight 1 --current "${index}" --total 10 --width "$(tput cols)" --message "Progress: ${index} of 10";
	sleep 1

	# Step finished, update progress bar
	progressBar --current "${index}" --total 10 --width "$(tput cols)" --message "Progress: ${index} of 10";

	sleep 1
done