#!/bin/bash
# Using two digits the represent the value being counted down
# Two-digits set in decimal representation used by printf
# Usage: 'countdown #delay #style'
# Delay is an integer from 1 to 99 (what happens if zero?)
# Style is a string, either "numbers" or "style"
# Arguments should always be given in that order
# Both arguments may be omitted, in that case delay defaults to ten seconds and style to "numbers"

defaultdelay=10
numberstyle="numbers"
symbolstyle="symbols"
defaultstyle=$numberstyle

if [ $# -gt 2 ]; then
   # More than two arguments
   echo Too many arguments
   exit
else
	# Two or less arguments
	if [ $# -eq 2 ]; then
		# Exactly two arguments
		# First argument should specify the delay
		delaysecs=$1
		# Second argument should specify the display style
		style=$2
	else
		if [ $# -eq 1 ]; then
			# Only one argument
			# Argument specifies the delay
			delaysecs=$1
			# Style defaults to "numbers"
			style="numbers"
		else
			# No arguments submitted
			# Delay defaults
			delaysecs=$defaultdelay
			# Style defaults
			style=$defaultstyle
		fi
	fi
fi
			
# Adjustment by one second
#delaysecs=$[$delaysecs-1]
delaystatic=$delaysecs

if [ $style == $numberstyle ]; then
	while [ $delaysecs -gt 0 ]
		do
		sleep 1 &
		printf "\r"
		# Text before counter
		printf "Stand by... "
		printf "%02d" $[delaysecs]
		delaysecs=$[$delaysecs-1]
		wait
	done
	# Printing the zero (end of count-down)
	printf "\b\b"
	printf "%02d" $[delaysecs]
	printf " - Done!"
	echo
else
	# style is symbolstyle
	printf -v line '%*s' "$delaysecs"
	printf "%s\r" "${line// /#}"
	while [ $delaysecs -gt 0 ]
		do
   	sleep 1 &
	   printf "+"
   	delaysecs=$[$delaysecs-1]
		wait
	done
	#printf "\b "
	echo
fi


# Bash quoting with ANSI-C style
# \b - backspace
# \r - carriage return
# \n - newline
# \f - form-feed
# \t - horizontal tabulator
# \v - vertical tabulator
# http://bash-hackers.org/wiki/doku.php/commands/builtin/printf