1 files changed, 55 insertions, 0 deletions
diff --git a/ruby/lib/irb/ext/workspaces.rb b/ruby/lib/irb/ext/workspaces.rb
new file mode 100644
index 0000000..a68e7d5
--- /dev/null
+++ b/ruby/lib/irb/ext/workspaces.rb
@@ -0,0 +1,55 @@
+#
+#   push-ws.rb - 
+#   	$Release Version: 0.9.5$
+#   	$Revision: 14912 $
+#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
+#
+# --
+#
+#   
+#
+
+module IRB
+  class Context
+
+    def irb_level
+      workspace_stack.size
+    end
+
+    def workspaces
+      if defined? @workspaces
+	@workspaces
+      else
+	@workspaces = []
+      end
+    end
+
+    def push_workspace(*_main)
+      if _main.empty?
+	if workspaces.empty?
+	  print "No other workspace\n"
+	  return nil
+	end
+	ws = workspaces.pop
+	workspaces.push @workspace
+	@workspace = ws
+	return workspaces
+      end
+
+      workspaces.push @workspace
+      @workspace = WorkSpace.new(@workspace.binding, _main[0])
+      if !(class<<main;ancestors;end).include?(ExtendCommandBundle)
+	main.extend ExtendCommandBundle
+      end
+    end
+
+    def pop_workspace
+      if workspaces.empty?
+	print "workspace stack empty\n"
+	return
+      end
+      @workspace = workspaces.pop
+    end
+  end
+end
+