TARGET := kwh-cost

DESTDIR ?=
PREFIX ?= /usr/local

CC ?= cc
CFLAGS := -std=c99 -O3 -Wall -Werror -Wextra -pedantic -flto


.PHONY: clean install uninstall test

${TARGET}: ${TARGET}.c
	${CC} ${CFLAGS} ${LDFLAGS} $< -o $@

clean:
	rm -f ${TARGET}

install: | ${TARGET}
	install -spDm755 ${TARGET} ${DESTDIR}${PREFIX}/bin/${TARGET}
	install -pDm644 LICENSE ${DESTDIR}${PREFIX}/share/licenses/${TARGET}/LICENSE

uninstall:
	rm -f ${DESTDIR}${PREFIX}/bin/${TARGET}
	rm -f ${DESTDIR}${PREFIX}/share/licenses/${TARGET}/LICENSE
	rmdir ${DESTDIR}${PREFIX}/share/licenses/${TARGET}

test: | ${TARGET}
	@echo -en "Does input \e[36m\"3.68 120 30d\"\e[0m gives 317.95? "
	@test "${shell ./kwh-cost 3.68 120 30d}" = "317.95" && { echo -e "\e[32mYES\e[0m"; } || { echo -e "\e[31mNO\e[0m"; }