1 files changed, 127 insertions, 0 deletions
diff --git a/lib/irb/extend-command.rb b/lib/irb/extend-command.rb
new file mode 100644
index 0000000000..bc657520a7
--- /dev/null
+++ b/lib/irb/extend-command.rb
@@ -0,0 +1,127 @@
+#
+#   irb/extend-command.rb - irb command extend
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA([email protected])
+#
+# --
+#
+#   
+#
+module IRB
+  #
+  # IRB extended command
+  # (JP: IRB拡張コマンド)
+  #
+  module ExtendCommand
+#    include Loader
+    
+    def irb_exit(ret = 0)
+      irb_context.exit(ret)
+    end
+    alias irb_quit irb_exit
+
+    def irb_fork(&block)
+      pid = send ExtendCommand.irb_original_method_name("fork")
+      unless pid 
+	class<<self
+	  alias_method :exit, ExtendCommand.irb_original_method_name('exit')
+	end
+	if iterator?
+	  begin
+	    yield
+	  ensure
+	    exit
+	  end
+	end
+      end
+      pid
+    end
+
+    def irb_change_binding(*main)
+      irb_context.change_binding(*main)
+    end
+    alias irb_change_workspace irb_change_binding
+
+    def irb_source(file)
+      irb_context.source(file)
+    end
+
+    def irb(*obj)
+      require "irb/multi-irb"
+      IRB.irb(nil, *obj)
+    end
+
+    def irb_context
+      IRB.conf[:MAIN_CONTEXT]
+    end
+
+    def irb_jobs
+      require "irb/multi-irb"
+      IRB.JobManager
+    end
+
+    def irb_fg(key)
+      require "irb/multi-irb"
+      IRB.JobManager.switch(key)
+    end
+
+    def irb_kill(*keys)
+      require "irb/multi-irb"
+      IRB.JobManager.kill(*keys)
+    end
+
+    # extend command functions
+    def ExtendCommand.extend_object(obj)
+      super
+      unless (class<<obj;ancestors;end).include?(ExtendCommand)
+	obj.install_aliases
+      end
+    end
+
+    OVERRIDE_NOTHING = 0
+    OVERRIDE_PRIVATE_ONLY = 0x01
+    OVERRIDE_ALL = 0x02
+
+    def install_aliases(override = OVERRIDE_NOTHING)
+
+      install_alias_method(:exit, :irb_exit, override | OVERRIDE_PRIVATE_ONLY)
+      install_alias_method(:quit, :irb_quit, override | OVERRIDE_PRIVATE_ONLY)
+      install_alias_method(:fork, :irb_fork, override | OVERRIDE_PRIVATE_ONLY)
+      install_alias_method(:kill, :irb_kill, override | OVERRIDE_PRIVATE_ONLY)
+
+      install_alias_method(:irb_cb, :irb_change_binding, override)
+      install_alias_method(:irb_ws, :irb_change_workspace, override)
+      install_alias_method(:source, :irb_source, override)
+      install_alias_method(:conf, :irb_context, override)
+      install_alias_method(:jobs, :irb_jobs, override)
+      install_alias_method(:fg, :irb_fg, override)
+    end
+
+    # override = {OVERRIDE_NOTHING, OVERRIDE_PRIVATE_ONLY, OVERRIDE_ALL}
+    def install_alias_method(to, from, override = OVERRIDE_NOTHING)
+      to = to.id2name unless to.kind_of?(String)
+      from = from.id2name unless from.kind_of?(String)
+
+      if override == OVERRIDE_ALL or
+	  (override == OVERRIDE_PRIVATE_ONLY) && !respond_to?(to) or
+	  (override == OVERRIDE_NOTHING) &&  !respond_to?(to, true)
+	target = self
+	(class<<self;self;end).instance_eval{
+	  if target.respond_to?(to, true) && 
+	      !target.respond_to?(ExtendCommand.irb_original_method_name(to), true)
+	    alias_method(ExtendCommand.irb_original_method_name(to), to) 
+	  end
+	  alias_method to, from
+	}
+      else
+	print "irb: warn: can't alias #{to} from #{from}.\n"
+      end
+    end
+
+    def self.irb_original_method_name(method_name)
+      "irb_" + method_name + "_org"
+    end
+  end
+end