1 files changed, 62 insertions, 0 deletions
diff --git a/lib/irb/command/base.rb b/lib/irb/command/base.rb
new file mode 100644
index 0000000000..b078b48237
--- /dev/null
+++ b/lib/irb/command/base.rb
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+#
+#   nop.rb -
+#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
+#
+
+module IRB
+  # :stopdoc:
+
+  module Command
+    class CommandArgumentError < StandardError; end
+
+    def self.extract_ruby_args(*args, **kwargs)
+      throw :EXTRACT_RUBY_ARGS, [args, kwargs]
+    end
+
+    class Base
+      class << self
+        def category(category = nil)
+          @category = category if category
+          @category
+        end
+
+        def description(description = nil)
+          @description = description if description
+          @description
+        end
+
+        def help_message(help_message = nil)
+          @help_message = help_message if help_message
+          @help_message
+        end
+
+        private
+
+        def highlight(text)
+          Color.colorize(text, [:BOLD, :BLUE])
+        end
+      end
+
+      def self.execute(irb_context, arg)
+        new(irb_context).execute(arg)
+      rescue CommandArgumentError => e
+        puts e.message
+      end
+
+      def initialize(irb_context)
+        @irb_context = irb_context
+      end
+
+      attr_reader :irb_context
+
+      def execute(arg)
+        #nop
+      end
+    end
+
+    Nop = Base
+  end
+
+  # :startdoc:
+end