#Protobuf Compilation
PROTOCC    := protoc-c
PROTOLIBS  := proto
PBUFV      := 2.5.0

#Proto Module Compile rules
PROTOFLAGS  += $(patsubst %,--proto_path=%,$(PROTOLIBS))
APP_RULES   += gen_proto
CLEAN_RULES += protoclean
SCRUB_RULES += protoscrub
PROTO_SRC   := $(wildcard proto/*.proto)
PROTO_TARG  := $(PROTO_SRC:.proto=.pb-c.c)
PROTO_TARG  := $(PROTO_TARG) $(PROTO_TARG:.c=.h)

.PHONY: protoclean protoscrub gen_proto

gen_proto: $(PROTO_TARG)

#download protobuf and move the google proto files.
proto/google:
	@mkdir tmp
#	@git clone git@github.com:google/protobuf.git tmp
	@curl https://protobuf.googlecode.com/files/protobuf-$(PBUFV).tar.gz | tar xz --directory=tmp
	@mv tmp/protobuf-$(PBUFV)/src/google proto/google
	@$(PROTOCC) --proto_path=proto/google/protobuf --c_out=proto/google/protobuf proto/google/protobuf/descriptor.proto
	@echo "google" > proto/.gitignore
	@echo "*.pb-c.*" >> proto/.gitignore
	@rm -Rf tmp

#default rule for making protobuf-compiled C code
%.pb-c.h %.pb-c.c: %.proto proto/google
	@$(PROTOCC) $(PROTOFLAGS) --c_out=$(@D) $<

%.pb-c.h %.pb-c.c: proto/%.proto proto/google
	@$(PROTOCC) $(PROTOFLAGS) --c_out=proto $<

%.pb-c.o %.pb-c.bc: %.pb-c.h %.pb-c.c
	@$(CC) -c -static $(CPPFLAGS) $(CFLAGS) -I/usr/include/google $< -o $@

protoclean:
	rm -f proto/*.pb-c.*

protoscrub:
	rm -Rf proto/google
	rm -f proto/.gitignore