protobuf-swift 1.6.2 (new formula)

Closes Homebrew/legacy-homebrew#39101.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/protobuf-swift.rb

@@ -0,0 +1,33 @@
+class ProtobufSwift < Formula
+  desc "An implementation of Protocol Buffers in Swift."
+  homepage "https://github.com/alexeyxo/protobuf-swift"
+  url "https://github.com/alexeyxo/protobuf-swift/archive/1.6.2.tar.gz"
+  sha256 "403ceaf16458765a7c0e8357468fd9da1b3b8113e2db530da5b65973dbf645c7"
+
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
+  depends_on "libtool" => :build
+  depends_on "protobuf"
+
+  def install
+    system "./autogen.sh"
+    system "./configure", "--prefix=#{prefix}"
+    system "make"
+    system "make", "install"
+  end
+
+  test do
+    testdata = <<-EOS.undent
+       enum Flavor{
+         CHOCOLATE = 1;
+          VANILLA = 2;
+        }
+        message IceCreamCone {
+          optional int32 scoops = 1;
+          optional Flavor flavor = 2;
+        }
+    EOS
+    (testpath/"test.proto").write(testdata)
+    system "protoc", "test.proto", "--swift_out=."
+  end
+end