TOP := $(dir $(lastword $(MAKEFILE_LIST)))
DIR = $(shell pwd)
LEAN_FILES = $(shell find $(DIR) -type f -name '*.lean')
OLEAN_FILES = $(LEAN_FILES:.lean=.olean)
DEP_FILES = $(LEAN_FILES:.lean=.d)
LEAN_VERSION_FILE = $(shell dirname $(LEAN))/version

all: $(OLEAN_FILES) $(DEP_FILES)

%.olean: %.lean $(LEAN_VERSION_FILE)
	@rm -f $@
	$(LEAN) $(LEAN_OPTIONS) $< -o $@ -c $(@:.olean=.clean)

%.d: %.lean $(LEAN_VERSION_FILE)
	@echo Making dependency file \'$@\' ...
	@rm -f $@
	@rm -f $@.tmp
	@$(LEAN) --deps $< > $@.tmp
	@printf "$(basename $@).olean : $< $@ " > $@
	@tr "\n" " " < $@.tmp >> $@
	@rm -f $@.tmp

-include $(LEAN_FILES:.lean=.d)

.PHONY: all clean

clean:
	find . -type f -name "*.olean" -delete
	find . -type f -name "*.clean" -delete
	find . -type f -name "*.d" -delete