Pass show_code: false to binding.irb if available

Author: k0kubun

lib/debug/thread_client.rb

@@ -987,7 +987,7 @@ def wait_next_action_
             result = frame_eval(eval_src)
           when :irb
             begin
-              result = frame_eval('binding.irb', binding_location: true)
+              result = frame_eval(binding_irb, binding_location: true)
             ensure
               # workaround: https://github.com/ruby/debug/issues/308
               Reline.prompt_proc = nil if defined? Reline
@@ -1177,6 +1177,17 @@ def wait_next_action_
       raise
     end
 
+    private def binding_irb
+      return @binding_irb if defined?(@binding_irb)
+
+      require 'irb' # prelude's binding.irb doesn't have show_code option
+      @binding_irb = +'binding.irb'
+      if binding.method(:irb).parameters.include?([:key, :show_code])
+        @binding_irb << '(show_code: false)'
+      end
+      @binding_irb
+    end
+
     def debug_event(ev, args)
       DEBUGGER__.debug{
         args = args.map { |arg| DEBUGGER__.safe_inspect(arg) }