#!/bin/sh

LUA_INTERPRETER=${LUA_INTERPRETER:-lua}
case "$LUA_INTERPRETER" in
	/*)
		;;
	*)
		ENV_WRAPPER=${ENV_WRAPPER:-"$(command -v env)"}
		;;
esac

do_build() {
	mkdir -p out/lua/cratera/ || exit 1
	mkdir -p out/bin || exit 1
	# worst tool for this job
	cp -R src/cratera/* out/lua/cratera/ || exit 1
	if [ "$ENV_WRAPPER" = '' ]; then
		printf "#!%s\n" "$LUA_INTERPRETER" >out/bin/cratera || exit 1
	else
		printf "#!%s %s\n" "$ENV_WRAPPER" "$LUA_INTERPRETER" >out/bin/cratera || exit 1
	fi
	cat src/bin/cratera.lua >>out/bin/cratera || exit 1
	chmod +x out/bin/cratera || exit 1
}

do_test() {
	# FIXME this does NOT handle LUA_PATH correctly.
	# FIXME nor LUA_INIT.
	do_build || exit 1
	mkdir -p out/test || exit 2
	# these tests use the regular lua interpreter
	LUA_PATH='./out/lua/?.lua;./out/lua/?/init.lua;;' "$LUA_INTERPRETER" test/testp.lua || exit 2
	LUA_PATH='./out/lua/?.lua;./out/lua/?/init.lua;;' "$LUA_INTERPRETER" test/testc.lua || exit 2
	LUA_PATH='./out/lua/?.lua;./out/lua/?/init.lua;;' "$LUA_INTERPRETER" test/testbc.lua || exit 2
	# these tests use the cratera interpreter
	LUA_PATH='./out/lua/?.lua;./out/lua/?/init.lua;;' out/bin/cratera test/tests.cratera || exit 2
}

case "$1" in
	-h|--help|help)
		echo 'The Cratera "Build System"'
		echo 'To build, use './build.sh build'. Files will be put in out/.'
		echo 'To run tests, use './build.sh test'.'
		echo 'The currently selected Lua interpreter is:'
		printf '    LUA_INTERPRETER=%s' "$LUA_INTERPRETER"
		echo ''
		echo 'The currently selected env wrapper is:'
		printf '    ENV_WRAPPER=%s' "$ENV_WRAPPER"
		echo ''
		;;
	test)
		do_test || exit $?
		;;
	build|'')
		do_build || exit $?
		;;
	*)
		echo 'sorry'
		;;
esac