Makefile

ndef = $(if $(value $(1)),,$(error $(1) not set))

protoc-gen-elixir:
	mix escript.build .

clean:
	rm protoc-gen-elixir

# PROTO_LIB should be your local path to https://github.com/google/protobuf/tree/master/src/google/protobuf
gen_google_proto: protoc-gen-elixir
	$(call ndef,PROTO_LIB)
	protoc -I $(PROTO_LIB) --elixir_out=lib/google --plugin=./protoc-gen-elixir $(PROTO_LIB)/descriptor.proto
	protoc -I $(PROTO_LIB) --elixir_out=lib/google --plugin=./protoc-gen-elixir $(PROTO_LIB)/compiler/plugin.proto

	# it's a hack until extension is implemented
	# 1047 is allocated to this project by Google
	sed -i "" '/field :ruby_package, 45/a \
	\ \ field :elixir_module_prefix, 1047, optional: true, type: :string\
	' lib/google/descriptor.pb.ex

	sed -i "" '/    :ruby_package,/a \
	\ \ \ \ :elixir_module_prefix,\
	' lib/google/descriptor.pb.ex

.PHONY: clean gen_google_proto