Add tools.mk and a Makefile that uses it

Makefile

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+.PHONY: rel deps test
+
+all: deps compile
+
+compile: deps
+	@./rebar compile
+
+app:
+	@./rebar compile skip_deps=true
+
+deps:
+	@./rebar get-deps
+
+clean:
+	@./rebar clean
+
+distclean: clean
+	@./rebar delete-deps
+
+DIALYZER_APPS = kernel stdlib sasl erts compiler syntax_tools
+
+include tools.mk
+
+typer:
+	typer --annotate -I ../ --plt $(PLT) -r src

tools.mk

@@ -0,0 +1,45 @@
+test: compile
+	./rebar eunit skip_deps=true
+
+docs:
+	./rebar doc skip_deps=true
+
+PLT ?= $(HOME)/.riak_combo_dialyzer_plt
+LOCAL_PLT = .local_dialyzer_plt
+DIALYZER_FLAGS ?= -Wunmatched_returns
+
+${PLT}: compile
+ifneq (,$(wildcard $(PLT)))
+	dialyzer --check_plt --plt $(PLT) --apps $(DIALYZER_APPS) && \
+		dialyzer --add_to_plt --plt $(PLT) --output_plt $(PLT) --apps $(DIALYZER_APPS) ; test $$? -ne 1
+else
+	dialyzer --build_plt --output_plt $(PLT) --apps $(DIALYZER_APPS); test $$? -ne 1
+endif
+
+${LOCAL_PLT}: compile
+ifneq (,$(wildcard deps/*))
+ifneq (,$(wildcard $(LOCAL_PLT)))
+	dialyzer --check_plt --plt $(LOCAL_PLT) deps/*/ebin  && \
+		dialyzer --add_to_plt --plt $(LOCAL_PLT) --output_plt $(LOCAL_PLT) deps/*/ebin ; test $$? -ne 1
+else
+	dialyzer --build_plt --output_plt $(LOCAL_PLT) deps/*/ebin ; test $$? -ne 1
+endif
+endif
+
+dialyzer: ${PLT} ${LOCAL_PLT}
+	@echo "==> $(shell basename $(shell pwd)) (dialyzer)"
+ifeq (,$(wildcard $(LOCAL_PLT)))
+	dialyzer $(DIALYZER_FLAGS) --plts $(PLT) -c ebin
+else
+	dialyzer $(DIALYZER_FLAGS) --plts $(PLT) $(LOCAL_PLT) -c ebin
+endif
+
+cleanplt:
+	@echo 
+	@echo "Are you sure?  It takes several minutes to re-build."
+	@echo Deleting $(PLT) and $(LOCAL_PLT) in 5 seconds.
+	@echo 
+	sleep 5
+	rm $(PLT)
+	rm $(LOCAL_PLT)
+