Ruby: generated foo.proto -> foo_pb.rb instead of foo.rb.

This brings us more into line with other langauges, and makes it more
obvious when we are requiring protobuf generated code.

conformance/conformance_ruby.rb

@@ -30,7 +30,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-require 'conformance'
+require 'conformance_pb'
 
 $test_count = 0
 $verbose = false

ruby/Rakefile

@@ -31,7 +31,7 @@ genproto_output = []
 unless ENV['IN_DOCKER'] == 'true'
   well_known_protos.each do |proto_file|
     input_file = "../src/" + proto_file
-    output_file = "lib/" + proto_file.sub(/\.proto$/, ".rb")
+    output_file = "lib/" + proto_file.sub(/\.proto$/, "_pb.rb")
     genproto_output << output_file
     file output_file => input_file do |file_task|
       sh "../src/protoc -I../src --ruby_out=lib #{input_file}"

ruby/tests/generated_code_test.rb

@@ -3,7 +3,7 @@
 # generated_code.rb is in the same directory as this test.
 $LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__)))
 
-require 'generated_code'
+require 'generated_code_pb'
 require 'test/unit'
 
 class GeneratedCodeTest < Test::Unit::TestCase

src/google/protobuf/compiler/ruby/ruby_generator.cc

@@ -48,7 +48,7 @@ namespace ruby {
 
 // Forward decls.
 std::string IntToString(int32 value);
-std::string StripDotProto(const std::string& proto_file);
+std::string GetRequireName(const std::string& proto_file);
 std::string LabelForField(google::protobuf::FieldDescriptor* field);
 std::string TypeName(google::protobuf::FieldDescriptor* field);
 void GenerateMessage(const google::protobuf::Descriptor* message,
@@ -70,13 +70,13 @@ std::string IntToString(int32 value) {
   return os.str();
 }
 
-std::string StripDotProto(const std::string& proto_file) {
+std::string GetRequireName(const std::string& proto_file) {
   int lastindex = proto_file.find_last_of(".");
-  return proto_file.substr(0, lastindex);
+  return proto_file.substr(0, lastindex) + "_pb";
 }
 
 std::string GetOutputFilename(const std::string& proto_file) {
-  return StripDotProto(proto_file) + ".rb";
+  return GetRequireName(proto_file) + ".rb";
 }
 
 std::string LabelForField(const google::protobuf::FieldDescriptor* field) {
@@ -391,7 +391,7 @@ bool MaybeEmitDependency(const FileDescriptor* import,
     return true;
   } else {
     printer->Print(
-      "require '$name$'\n", "name", StripDotProto(import->name()));
+      "require '$name$'\n", "name", GetRequireName(import->name()));
     return true;
   }
 }

src/google/protobuf/compiler/ruby/ruby_generator_unittest.cc

@@ -91,12 +91,12 @@ TEST(RubyGeneratorTest, GeneratorTest) {
   // Load the generated output and compare to the expected result.
   string output;
   GOOGLE_CHECK_OK(File::GetContents(
-      TestTempDir() + "/ruby_generated_code.rb",
+      TestTempDir() + "/ruby_generated_code_pb.rb",
       &output,
       true));
   string expected_output;
   GOOGLE_CHECK_OK(File::GetContents(
-      ruby_tests + "/ruby_generated_code.rb",
+      ruby_tests + "/ruby_generated_code_pb.rb",
       &expected_output,
       true));
   EXPECT_EQ(expected_output, output);