Add Homebrew support #3

contrib/homebrew/protoc-gen-gotemplate.rb

@@ -0,0 +1,20 @@
+require "language/go"
+
+class ProtocGenGotemplate < Formula
+  desc "protocol generator + golang text/template (protobuf)"
+  homepage "https://github.com/moul/protoc-gen-gotemplate"
+  url "https://github.com/moul/protoc-gen-gotemplate/archive/v1.0.0.tar.gz"
+  sha256 "1ff57cd8513f1e871cf71dc8f2099bf64204af0df1b7397370827083e95bbb82"
+  head "https://github.com/moul/protoc-gen-gotemplate.git"
+
+  depends_on "go" => :build
+
+  def install
+    ENV["GOPATH"] = buildpath
+    ENV["GOBIN"] = buildpath
+    ENV["GO15VENDOREXPERIMENT"] = "1"
+    (buildpath/"src/github.com/moul/protoc-gen-gotemplate").install Dir["*"]
+
+    system "go", "build", "-o", "#{bin}/protoc-gen-gotemplate", "-v", "github.com/moul/protoc-gen-gotemplate"
+  end
+end