Add arithmetics helpers - fix #94

examples/arithmetics/Makefile

@@ -0,0 +1,13 @@
+.PHONY: build
+build:
+	mkdir -p output
+	protoc -I. --gotemplate_out=template_dir=templates,debug=true,all=true:output proto/*.proto
+
+
+.PHONY: re
+re: clean build
+
+
+.PHONY: clean
+clean:
+	rm -rf output

examples/arithmetics/output/arithmetics

@@ -0,0 +1,5 @@
+
+add(1,2) = 3
+subtract(1,2) = -1
+multiply(1,2) = 2
+divide(2,1) = 2

examples/arithmetics/proto/arithmetics.proto

@@ -0,0 +1,2 @@
+syntax = "proto3";
+package Arithmetics;

examples/arithmetics/templates/arithmetics.tmpl

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+{{with $a := 1}}{{with $b := 2}}
+add(1,2) = {{add $a $b}}
+subtract(1,2) = {{subtract $a $b}}
+multiply(1,2) = {{multiply $a $b}}
+divide(2,1) = {{divide $b $a}}
+{{end}}{{end}}