Add region tags to the Go protobuf examples.

This will allow us to like to specific snippets of code in the
documentation.  I plan to create a tutorial similar to the C# tutorial
https://developers.google.com/protocol-buffers/docs/csharptutorial

Since that tutorial has sections for populating a proto, parsing, and
serializing, I made a region for each of these for Go.  To make the
populating sample more self-contained, I refactor the listing example
slightly.

1 files changed, 5 insertions, 0 deletions

diff --git a/examples/add_person.go b/examples/add_person.go
index 6b2d3d69..4f2e7f74 100644
--- a/examples/add_person.go
+++ b/examples/add_person.go
@@ -105,7 +105,10 @@ func main() {
 			log.Fatalln("Error reading file:", err)
 		}
 	}
+
+	// [START marshal_proto]
 	book := &pb.AddressBook{}
+	// [START_EXCLUDE]
 	if err := proto.Unmarshal(in, book); err != nil {
 		log.Fatalln("Failed to parse address book:", err)
 	}
@@ -116,6 +119,7 @@ func main() {
 		log.Fatalln("Error with address:", err)
 	}
 	book.People = append(book.People, addr)
+	// [END_EXCLUDE]
 
 	// Write the new address book back to disk.
 	out, err := proto.Marshal(book)
@@ -125,4 +129,5 @@ func main() {
 	if err := ioutil.WriteFile(fname, out, 0644); err != nil {
 		log.Fatalln("Failed to write address book:", err)
 	}
+	// [END marshal_proto]
 }