progressbar.bash

#!/usr/bin/env bash
# shellcheck disable=SC1000

# generate by v3.0.2
# link (https://github.com/Template-generator/script-genrating/tree/v3.0.2)

# set -x #DEBUG - Display commands and their arguments as they are executed.
# set -v #VERBOSE - Display shell input lines as they are read.
# set -n #EVALUATE - Check syntax of the script but don't execute.

#/ -----------------------------------
#/ Description:  Add progressbar method
#/ -----------------------------------
#/ Create by:    Kamontat Chantrachirathunrong <[email protected]>
#/ Since:        02/09/2018
#/ -----------------------------------

# 1. func -> execute function
# 2. name -> name of this execution
# n. value for each execution
progressbar() {
	local cmd="$1"
	local title="$2"
	shift 2
	IFS=" " read -r -a array <<<"$@"
	duration=$#

	curr_bar=0
	for ((elapsed = 1; elapsed <= duration; elapsed++)); do
		barsize=$(($(tput cols) - 25))
		unity=$((barsize / duration))
		increment=$((barsize % duration))
		skip=$((duration / (duration - increment)))
		# Elapsed
		((curr_bar += unity))

		if [[ $increment -ne 0 ]]; then
			if [[ $skip -eq 1 ]]; then
				[[ $((elapsed % (duration / increment))) -eq 0 ]] && ((curr_bar++))
			else
				[[ $((elapsed % skip)) -ne 0 ]] && ((curr_bar++))
			fi
		fi

		[[ $elapsed -eq 1 && $increment -eq 1 && $skip -ne 1 ]] && ((curr_bar++))
		[[ $((barsize - curr_bar)) -eq 1 ]] && ((curr_bar++))
		[[ $curr_bar -lt $barsize ]] || curr_bar=$barsize

		printf "%-15s |" "$title"

		# Exection
		"$cmd" "${array[elapsed - 1]}" || exit $?

		# Progress
		for ((filled = 0; filled <= curr_bar; filled++)); do
			printf "#"
		done

		# Remaining
		for ((remain = curr_bar; remain < barsize; remain++)); do
			printf " "
		done

		# Percentage
		printf "| %s%%" $(((elapsed * 100) / duration))

		# Return
		printf '\r'
	done
	echo
}