From cb79b29ac589ba0f17da1588430db4407f73b5f6 Mon Sep 17 00:00:00 2001
From: Makarand Dharmapurikar <makarandd@google.com>
Date: Wed, 8 Jun 2016 15:07:54 -0700
Subject: fix for issue 6344. added printing of .proto file comments in
 generated code.

---
 src/compiler/objective_c_generator.cc | 33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

diff --git a/src/compiler/objective_c_generator.cc b/src/compiler/objective_c_generator.cc
index 71a674174d..db0b61ee6f 100644
--- a/src/compiler/objective_c_generator.cc
+++ b/src/compiler/objective_c_generator.cc
@@ -60,9 +60,34 @@ void PrintProtoRpcDeclarationAsPragma(Printer *printer,
                  " returns ($server_stream$$response_type$)\n\n");
 }
 
+template <typename DescriptorType>
+static void PrintAllComments(const DescriptorType* desc, Printer* printer) {
+  std::vector<grpc::string> comments;
+  grpc_generator::GetComment(desc, grpc_generator::COMMENTTYPE_LEADING_DETACHED,
+                             &comments);
+  grpc_generator::GetComment(desc, grpc_generator::COMMENTTYPE_LEADING,
+                             &comments);
+  grpc_generator::GetComment(desc, grpc_generator::COMMENTTYPE_TRAILING,
+                             &comments);
+  if (comments.empty()) {
+    return;
+  }
+  printer->Print("/**\n");
+  for (auto it = comments.begin(); it != comments.end(); ++it) {
+    printer->Print(" * ");
+    size_t start_pos = it->find_first_not_of(' ');
+    if (start_pos != grpc::string::npos) {
+      printer->Print(it->c_str() + start_pos);
+    }
+    printer->Print("\n");
+  }
+  printer->Print(" */\n");
+}
+
 void PrintMethodSignature(Printer *printer, const MethodDescriptor *method,
                           const map< ::grpc::string, ::grpc::string> &vars) {
-  // TODO(jcanizales): Print method comments.
+  // Print comment
+  PrintAllComments(method, printer);
 
   printer->Print(vars, "- ($return_type$)$method_name$With");
   if (method->client_streaming()) {
@@ -195,8 +220,10 @@ void PrintMethodImplementations(Printer *printer,
     printer.Print("@end\n\n");
 
     printer.Print(
-        "// Basic service implementation, over gRPC, that only does"
-        " marshalling and parsing.\n");
+        "/**\n"
+        " * Basic service implementation, over gRPC, that only does\n"
+        " * marshalling and parsing.\n"
+        " */\n");
     printer.Print(vars,
                   "@interface $service_class$ :"
                   " GRPCProtoService<$service_class$>\n");
-- 
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