Add `-d` option for `mruby` and `mirb`.

mrbgems/mruby-bin-mirb/bintest/mirb.rb

@@ -10,3 +10,10 @@ assert('regression for #1563') do
   o, s = Open3.capture2('bin/mirb', :stdin_data => "a=1;b=2;c=3\nb\nc")
   assert_true o.include?('=> 3')
 end
+
+assert('mirb -d option') do
+  o, s = Open3.capture2('bin/mirb', :stdin_data => "p $DEBUG\n")
+  assert_true o.include?('=> false')
+  o, s = Open3.capture2('bin/mirb -d', :stdin_data => "p $DEBUG\n")
+  assert_true o.include?('=> true')
+end

mrbgems/mruby-bin-mirb/tools/mirb/mirb.c

@@ -54,6 +54,7 @@
 #include <mruby/proc.h>
 #include <mruby/compile.h>
 #include <mruby/string.h>
+#include <mruby/variable.h>
 
 #ifdef ENABLE_READLINE
 
@@ -219,6 +220,7 @@ is_code_block_open(struct mrb_parser_state *parser)
 struct _args {
   FILE *rfp;
   mrb_bool verbose      : 1;
+  mrb_bool debug        : 1;
   int argc;
   char** argv;
 };
@@ -228,6 +230,7 @@ usage(const char *name)
 {
   static const char *const usage_msg[] = {
   "switches:",
+  "-d           Set $DEBUG to true (same as `mruby -d`)"
   "-v           print version number, then run in verbose mode",
   "--verbose    run in verbose mode",
   "--version    print the version",
@@ -254,6 +257,9 @@ parse_args(mrb_state *mrb, int argc, char **argv, struct _args *args)
 
     item = argv[0] + 1;
     switch (*item++) {
+    case 'd':
+      args->debug = TRUE;
+      break;
     case 'v':
       if (!args->verbose) mrb_show_version(mrb);
       args->verbose = TRUE;
@@ -413,6 +419,7 @@ main(int argc, char **argv)
     }
   }
   mrb_define_global_const(mrb, "ARGV", ARGV);
+  mrb_gv_set(mrb, mrb_intern_lit(mrb, "$DEBUG"), mrb_bool_value(args.debug));
 
 #ifdef ENABLE_READLINE
   history_path = get_history_path(mrb);

mrbgems/mruby-bin-mruby/bintest/mruby.rb

@@ -58,3 +58,10 @@ RUBY
   assert_equal "NilClass", `#{cmd('mruby')} #{script.path}`
   assert_equal 0, $?.exitstatus
 end
+
+assert('mruby -d option') do
+  o = `#{cmd('mruby')} -e #{shellquote('p $DEBUG')}>&1`
+  assert_equal o, "false\n"
+  o = `#{cmd('mruby')} -d -e #{shellquote('p $DEBUG')}>&1`
+  assert_equal o, "true\n"
+end

mrbgems/mruby-bin-mruby/tools/mruby/mruby.c

@@ -27,6 +27,7 @@ struct _args {
   mrb_bool mrbfile      : 1;
   mrb_bool check_syntax : 1;
   mrb_bool verbose      : 1;
+  mrb_bool debug        : 1;
   int argc;
   char** argv;
 };
@@ -38,6 +39,7 @@ usage(const char *name)
   "switches:",
   "-b           load and execute RiteBinary (mrb) file",
   "-c           check syntax only",
+  "-d           Set debugging flags (set $DEBUG to true)"
   "-e 'command' one line of script",
   "-v           print version number, then run in verbose mode",
   "--verbose    run in verbose mode",
@@ -78,6 +80,9 @@ parse_args(mrb_state *mrb, int argc, char **argv, struct _args *args)
     case 'c':
       args->check_syntax = TRUE;
       break;
+    case 'd':
+      args->debug = TRUE;
+      break;
     case 'e':
       if (item[0]) {
         goto append_cmdline;
@@ -199,6 +204,7 @@ main(int argc, char **argv)
       }
     }
     mrb_define_global_const(mrb, "ARGV", ARGV);
+    mrb_gv_set(mrb, mrb_intern_lit(mrb, "$DEBUG"), mrb_bool_value(args.debug));
 
     c = mrbc_context_new(mrb);
     if (args.verbose)