#!/bin/sh
# Egg_Timer.sh
# Fully POSIX compliant.
# Tested on OSX 10.7.5, OSX 10.11.3, Ubuntu64 and CygWin64 on Windows 8.1.
# It has fully passed CheckShell's tests. Tuesday July 5th, 2016.
# Public Domain, 2016, B.Walker, G0LCU.

mins=3
secs=0
fsecs=1.00000
keyboard="?"
width=12
horiz=36
vert=3
spaces='              '
stars='**************'
char=0
platform=$( uname )

# Generate the sinewave beep.
if [ ! -e "/tmp/beep.wav" ]
then
	> /tmp/beep.wav
	printf "\122\111\106\106\144\037\000\000\127\101\126\105\146\155\164\040\020\000\000\000\001\000\001\000\100\037\000\000\100\037\000\000\001\000\010\000\144\141\164\141\100\037\000\000" >> /tmp/beep.wav
	while [ $char -le 999 ]
	do
		printf "\200\046\000\046\177\331\377\331" >> /tmp/beep.wav
		char=$(( char + 1 ))
	done
fi

clrscn()
{
	# A default CygWin and CygWin64 install does not have 'clear' nor 'tput'!
	printf "\033c\033[0m\033[2J\033[H"
}

display()
{
	clrscn
	echo '	  At a glance Egg Timer, Public Domain, 2016, B.Walker, G0LCU.
				   ____________  
				 / ************ \ 
				||**************|| 
				 \**************/ 
				  \************/ 
				   \**********/ 
				    \********/ 
				     \******/ 
				      \****/ 
				       \**/ 
				        || 
				       /..\ 
				      / .. \ 
				     /  ..  \ 
				    /   ..   \ 
				   /    ..    \ 
				  /     ..     \ 
				 /      ..      \ 
				||      ..      || 
				 \      **      / 
__________________________________==============________________________________'
	echo "			      Time set to $secs seconds."
}

set_time()
{
	clrscn
	echo ''
	echo '		Enter the timer time in minutes first and seconds next.'
	echo ''
	printf 'Enter the number of minutes:- '
	read -r mins
	echo ''
	printf 'Enter the number of seconds:- '
	read -r secs
	echo ''
	printf "Timer set to %s? minutes and %s? seconds, are these correct? (Y/N):- " "$mins" "$secs"
	read -r keyboard
	if [ "$keyboard" = "N" ] || [ "$keyboard" = "n" ]
	then
		set_time
	fi

	# Check for typos and other errors.
	case $mins in
		''|*[!0-9]*) mins=3 ;;
	esac
	case $secs in
		''|*[!0-9]*) secs=0 ;;
	esac
	if [ $mins -gt 59 ] || [ $mins -lt 0 ]
	then
		mins=59
	fi
	if [ $secs -gt 59 ] || [ $secs -lt 0 ]
	then
		secs=59
	fi
	secs=$(( ( mins * 60 ) + secs ))
	if [ $secs -lt 15 ]
	then
		secs=15
	fi
	# A default CygWin or CygWin64 install does not have 'bc' nor 'dc'.
	fsecs=$( awk -v fp=$secs 'BEGIN { print ( fp / 17 ); }' )
}

# Main loop.
while true
do
	set_time
	horiz=36
	keyboard="?"
	width=12
	spaces='              '
	stars='**************'
	display
	sleep "$fsecs"
	printf "\033[3;36f      \033[24;1f"
	for vert in 3 4 5
	do
		printf "\033[%u;35f%s\033[24;1f" "$(( 24 - vert ))" "$stars"
		printf "\033[%u;35f%s\033[24;1f" "$vert" "$spaces"
		sleep "$fsecs"
		printf "\033[%u;41f**\033[24;1f" "$(( 23 - vert ))"
		sleep "$fsecs"
	done
	for vert in 6 7 8 9 10
	do
		char=$( awk -v star="$stars" -v wide="$width" 'BEGIN { print substr(star,1,wide); }' )
		printf "\033[%u;%uf%s\033[24;1f" "$(( 24 - vert ))" "$horiz" "$char"
		char=$( awk -v space="$spaces" -v wide="$width" 'BEGIN { print substr(space,1,wide); }' )
		printf "\033[%u;%uf%s\033[24;1f" "$vert" "$horiz" "$char"
		sleep "$fsecs"
		printf "\033[%u;41f**\033[24;1f" "$(( 23 - vert ))"
		sleep "$fsecs"
		horiz=$(( horiz + 1 ))
		width=$(( width - 2 ))
	done
	printf "\033[11;%uf  \033[24;1f" "$horiz"
	for char in 1 2 3
	do
		if [ "$platform" = "Darwin" ]
		then
			afplay /tmp/beep.wav > /dev/null 2>&1
		else
			aplay /tmp/beep.wav > /dev/null 2>&1
		fi
		if [ "$( awk -v name="$platform" 'BEGIN { print substr(name,1,6); } ')" = "CYGWIN" ]
		then
			cat /tmp/beep.wav > /dev/dsp
		fi
	done
	printf 'Run again? (Y/N):- '
	read -r keyboard
	if [ "$keyboard" = "N" ] || [ "$keyboard" = "n" ]
	then
		break
	fi
done
clrscn
exit 0
# Egg_Timer.sh end.