Make the Ruby generator dynamic.

- Modify the Ruby generator constructor to fit the new generic interface.
- Register the Ruby genrator with the central registry.
- Deprecate the old way of invoking the Ruby generator.
- main.cc no longer includes t_rb_generator.h.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665617 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/compiler/cpp/src/main.cc b/compiler/cpp/src/main.cc
index 7181d26..9e94482 100644
--- a/compiler/cpp/src/main.cc
+++ b/compiler/cpp/src/main.cc
@@ -36,7 +36,6 @@
 #include "parse/t_program.h"
 #include "parse/t_scope.h"
 #include "generate/t_php_generator.h"
-#include "generate/t_rb_generator.h"
 #include "generate/t_xsd_generator.h"
 #include "generate/t_perl_generator.h"
 #include "generate/t_erl_generator.h"
@@ -601,7 +600,6 @@
   fprintf(stderr, "  -phpl       Generate PHP-lite (with -php)\n");
   fprintf(stderr, "  -phpa       Generate PHP with autoload (with -php)\n");
   fprintf(stderr, "  -phpo       Generate PHP with object oriented subclasses (with -php)\n");
-  fprintf(stderr, "  -rb         Generate Ruby output files\n");
   fprintf(stderr, "  -xsd        Generate XSD output files\n");
   fprintf(stderr, "  -perl       Generate Perl output files\n");
   fprintf(stderr, "  -erl        Generate Erlang output files\n");
@@ -867,13 +865,6 @@
       delete phpi;
     }
 
-    if (gen_rb) {
-      pverbose("Generating Ruby\n");
-      t_rb_generator* rb = new t_rb_generator(program);
-      rb->generate_program();
-      delete rb;
-    }
-
     if (gen_xsd) {
       pverbose("Generating XSD\n");
       t_xsd_generator* xsd = new t_xsd_generator(program);
@@ -1096,6 +1087,10 @@
     pwarning(1, "-py is deprecated.  Use --gen py");
     generator_strings.push_back("py");
   }
+  if (gen_rb) {
+    pwarning(1, "-rb is deprecated.  Use --gen rb");
+    generator_strings.push_back("rb");
+  }
   if (gen_cocoa) {
     pwarning(1, "-cocoa is deprecated.  Use --gen cocoa");
     generator_strings.push_back("cocoa");
@@ -1114,7 +1109,7 @@
   }
 
   // You gotta generate something!
-  if (!gen_php && !gen_phpi && !gen_rb && !gen_xsd && !gen_perl && !gen_erl && generator_strings.empty()) {
+  if (!gen_php && !gen_phpi && !gen_xsd && !gen_perl && !gen_erl && generator_strings.empty()) {
     fprintf(stderr, "!!! No output language(s) specified\n\n");
     usage();
   }