.POSIX:
.PHONY: build docs

NAME := args

ifneq "$(wildcard src/*.h)" ''
	HEADERS = $(wildcard src/*.h)
endif

define DOCS
	$(subst docs/, build/man/,
		$(patsubst
			%.md, %,
			$(wildcard docs/*.md)
		)
	)
endef

build: build/ build/$(NAME)

build/$(NAME): src/main.c $(HEADERS)
	cc -o $@ $<

define PREFIX
ifeq $(UID) 0
	/usr/local
else
	$(HOME)/.local
endif
endef

install:
	install -CDm0755 -t $(PREFIX)/bin/ build/$(NAME)
	install -CDm0644 -t  $(PREFIX)/share/man/man1 build/$(NAME)

test:
	$(error testing using `make' not supported; use `just')

docs:
	make $(strip $(DOCS))

build/man/%: docs/%.md build/man/ docs/
	pandoc --to man \
		--standalone \
		--output $@ \
		$<

%/:
	@mkdir -p $@