From e28451585db8828e18b4638b1513352efb98f86c Mon Sep 17 00:00:00 2001
From: takkaw <takkaw@gmail.com>
Date: Mon, 9 Sep 2019 22:32:10 +0900
Subject: add special local variable _ in mirb

---
 mrbgems/mruby-bin-mirb/tools/mirb/mirb.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c b/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
index 17b2ca16c..fc85cdac0 100644
--- a/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
+++ b/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
@@ -406,6 +406,26 @@ ctrl_c_handler(int signo)
 }
 #endif
 
+#ifdef ENABLE_MIRB_UNDERSCORE
+void decl_lv_underscore(mrb_state *mrb, mrbc_context *cxt)
+{
+  struct RProc *proc;
+  struct mrb_parser_state *parser;
+
+  parser = mrb_parse_string(mrb, "_=nil", cxt);
+  if (parser == NULL) {
+    fputs("create parser state error\n", stderr);
+    mrb_close(mrb);
+    exit(EXIT_FAILURE);
+  }
+
+  proc = mrb_generate_code(mrb, parser);
+  mrb_vm_run(mrb, proc, mrb_top_self(mrb), 0);
+
+  mrb_parser_free(parser);
+}
+#endif
+
 int
 main(int argc, char **argv)
 {
@@ -471,6 +491,10 @@ main(int argc, char **argv)
 
   cxt = mrbc_context_new(mrb);
 
+#ifdef ENABLE_MIRB_UNDERSCORE
+  decl_lv_underscore(mrb, cxt);
+#endif
+
   /* Load libraries */
   for (i = 0; i < args.libc; i++) {
     FILE *lfp = fopen(args.libv[i], "r");
@@ -643,6 +667,9 @@ main(int argc, char **argv)
             result = mrb_any_to_s(mrb, result);
           }
           p(mrb, result, 1);
+#ifdef ENABLE_MIRB_UNDERSCORE
+          *(mrb->c->stack + 1) = result;
+#endif
         }
       }
       ruby_code[0] = '\0';
-- 
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