configure

#! /bin/sh
TEMPLATE=Makefile.in
TARGET=Makefile

helpmsg()
{
	cat <<EOF

Usage: ./configure <required arguments> [optional arguments]

Required arguments:
--teensy-version|-t <30|31> : specify Teensy version used, either 3.0 or 3.1
--arduino-path|-p <path> : path where your Arduino+Teensyduino install is located

Optional arguments:
--frequency|-f <2|4|8|16|24|48|72|96|120|144|168> : specify Teensy core frequency (default=48)
--rtc-compensate|-r <number> : specify RTC adjustment for your crystal (default=0)
--debug|-d <0-3> : specify debug level (default=1)
--timezone <TZ> : specify default timezone (TZ format e.g. CET-1CEST,M3.5.0,M10.5.0/3 for Paris, autodetected from your build machine if not specified)

Example: ./configure --teensy-version 31 --frequency 96 --rtc-compensate -46 --arduino-path ~/arduino-1.0.6 --debug 0

EOF
}

if ! test -e $TEMPLATE ; then
	echo "[ERROR] Missing required file $TEMPLATE"
	exit 1
fi

FREQUENCY=48
TEENSY_VERSION=required
ARDUINO_PATH=required
RTC_COMPENSATE=0
PROJECT_DEBUG=1
TIMEZONE=`tail -n1 /etc/localtime`

savedargs="$@"

if [ -n "$1" ] ; then
	TEMP=`getopt -o f:t:p:r:d:z: -l frequency:,teensy-version:,arduino-path:,rtc-compensate:,debug:,timezone: -n configure -- "$@"`
	if [ $? != 0 ] ; then echo "configure: aborting..." >&2 ; exit 1 ; fi
	# Note the quotes around `$TEMP': they are essential!
	eval set -- "$TEMP"

	while true ; do
		case "$1" in
			-f|--frequency)
				if [ "$2" != 168 ] && [ "$2" != 144 ] && [ "$2" != 120 ] && [ "$2" != 96 ] && [ "$2" != 72 ] && [ "$2" != 48 ] && [ "$2" != 24 ] && [ "$2" != 16 ] && [ "$2" != 8 ] && [ "$2" != 4 ] && [ "$2" != 2 ] ; then
					echo "configure: frequency out of bounds ($2), expected one of: 2, 4, 8, 16, 24, 48 (default), 72, 96, 120, 144, 168."
					exit 1
				else
					FREQUENCY=$2
				fi
				shift 2 ;;
			-t|--teensy-version)
				if [ "$2" != 30 ] && [ "$2" != 31 ]; then
					echo "configure: teensy version unknown, expected one of: 30 (Teensy 3.0) or 31 (Teensy 3.1)."
					exit 1;
				else
					TEENSY_VERSION=$2
				fi
				shift 2 ;;
			-p|--arduino-path)
				if [ ! -r "$2" ] || [ ! -d "$2" ]; then
					echo "configure: specified Arduino path ($2) is either not a directory or not readable."
					exit 1;
				elif [ ! -d "$2/hardware/teensy" ] ; then
					echo "configure: specified Arduino path ($2) doesn't seem correct or doesn't have Teensyduino installed."
					exit 1;
				else
					ARDUINO_PATH="$2"
				fi
				shift 2 ;;
			-r|--rtc-compensate)
				if ! echo "$2" | grep -qE '^-?[0-9]+$'; then
					echo "configure: expected a number instead of '$2'"
					exit 1;
				else
					RTC_COMPENSATE=$2
				fi
				shift 2 ;;
			-z|--timezone)
				if ! echo "$2" | grep -qE '^[^;]+;[^;]+;[^;]+$'; then
					echo "configure: expected a TZ instead of '$2' (e.g. CET-1CEST,M3.5.0,M10.5.0/3)"
					exit 1;
				else
					TIMEZONE=$2
				fi
				shift 2 ;;
			-d|--debug)
				if [ "$2" != 0 ] && [ "$2" != 1 ] && [ "$2" != 2 ] && [ "$2" != 3 ] ; then
					echo "configure: expected a number in the range 0-3 instead of '$2'"
					exit 1;
				else
					PROJECT_DEBUG=$2
				fi
				shift 2 ;;
			--) shift ; break ;;
			*) echo "configure: options parsing internal error! ($1)"; exit 1 ;;
		esac
	done

	if [ -n "$1" ] ; then
		echo "configure: sparse arguments found: $@"
		helpmsg
		exit 1
	fi
	#for arg do echo '--> '"\`$arg'" ; done
fi

# check for required arguments
if [ "$TEENSY_VERSION" = "required" ] ; then
	echo "configure: missing required option --teensy-version"
	helpmsg
	exit 1
elsif [ "$ARDUINO_PATH" = "required" ] ;
	echo "configure: missing required option --arduino-path"
	helpmsg
	exit 1
fi

if [ -x "$ARDUINO_PATH/hardware/tools/arm/bin/arm-none-eabi-gcc" ] ; then
  :
elif [ -x "$ARDUINO_PATH/hardware/tools/arm-none-eabi/bin/arm-none-eabi-gcc" ] ; then
  :
else
	echo "configure: coudln't find a valid ARM compiler under $ARDUINO_PATH/hardware/tools"
	exit 1
fi

echo "# cmd used: $0 $savedargs" > $TARGET
cat $TEMPLATE >> $TARGET
sed -i -re "s%#TEENSY_VERSION#%$TEENSY_VERSION%g" $TARGET
sed -i -re "s%#FREQUENCY#%$FREQUENCY%g" $TARGET
sed -i -re "s%#ARDUINO_PATH#%$ARDUINO_PATH%g" $TARGET
sed -i -re "s%#RTC_COMPENSATE#%$RTC_COMPENSATE%g" $TARGET
sed -i -re "s%#PROJECT_DEBUG#%$PROJECT_DEBUG%g" $TARGET
sed -i -re "s%#TIMEZONE#%$TIMEZONE%g" $TARGET