#!/bin/bash

# Define global variables
confile='gcc.cfg'
debug='false'
arch='casio'




##---
##	Help screen
##---
function fhelp()
{
	cat << EOF
Usage:  ./configure [-h] [--help] [--arch=<TARGET>] [--debug]
-h, --help                Display this help
--arch=<TARGET>           Specify POSIX architecture to compile with:
                            - casio (Casio calculators)
			    - native (use clasic gcc compiler)
--debug                   Enable "-g3" compialtion flags to have more
                          informations about program
EOF
	exit 0
}




##---
##	Parse entry
##---
for opt in "$@"
do
	# Check flags
	case "$1" in
		-h | --help)	fhelp;;
		--arch=*)	arch=${1#*=};;
		--debug)	debug='true';;
		*)
			echo  "'$1' invalide arg"
			exit 84;;
	esac

	# Shift current arguments list
	# to the left.
	shift;
done




##---
##	Check arguments
##---
if [ $arch != 'casio' ] && [ $arch != 'native' ]; then
	echo "'$arch': Invalide architecture, abord"
	exit 84
fi




##---
##	Generate configuration file
##---
function generate_output()
{
	echo "CONFIG.ARCH := $arch"
	if [ $arch == 'casio' ]; then
		echo 'CONFIG.TOOLCHAIN := sh-elf-'
		echo 'CONFIG.CEXTRA := -m3 -mb -mrenesas -ffreestanding -nostdlib'
	else
		[[ $debug == 'true' ]] && echo 'CONFIG.CEXTRA := -g3'
	fi
}
generate_output > $confile
echo "Configuration saved in $confile !"