ruby-sourcefilter.patch

diff -up ruby-1.9.2-p290/ruby.c filter-ruby-1.9.2-p290/ruby.c
--- ruby-1.9.2-p290/ruby.c	2010-12-23 19:49:13.000000000 +0900
+++ filter-ruby-1.9.2-p290/ruby.c	2011-10-28 21:50:44.452623054 +0900
@@ -1618,7 +1618,16 @@ load_file_internal(VALUE arg)
 	return (VALUE)rb_parser_compile_string(parser, fname, f, line_start);
     }
     rb_funcall(f, set_encoding, 2, rb_enc_from_encoding(enc), rb_str_new_cstr("-"));
-    tree = rb_parser_compile_file(parser, fname, f, line_start);
+    {
+	VALUE source_filter = rb_intern("source_filter");
+	if (rb_obj_respond_to(rb_cObject, source_filter, 1)) {
+	    VALUE s1 = rb_funcall(f, rb_intern("read"), 0);
+	    VALUE s2 = rb_funcall(rb_mKernel, source_filter, 1, s1);
+	    tree = rb_parser_compile_string(parser, fname, s2, line_start);
+	} else {
+	    tree = rb_parser_compile_file(parser, fname, f, line_start);
+	}
+    }
     rb_funcall(f, set_encoding, 1, rb_parser_encoding(parser));
     if (script && tree && rb_parser_end_seen_p(parser)) {
 	rb_define_global_const("DATA", f);