Enhancement - Permission

- Implemented new Permission object to manage tri-state confirmation
  of changes to multiple tasks.

src/Permission.h

@@ -0,0 +1,49 @@
+////////////////////////////////////////////////////////////////////////////////
+// task - a command line task list manager.
+//
+// Copyright 2006 - 2009, Paul Beckingham.
+// All rights reserved.
+//
+// This program is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation; either version 2 of the License, or (at your option) any later
+// version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the
+//
+//     Free Software Foundation, Inc.,
+//     51 Franklin Street, Fifth Floor,
+//     Boston, MA
+//     02110-1301
+//     USA
+//
+////////////////////////////////////////////////////////////////////////////////
+#ifndef INCLUDED_PERMISSION
+#define INCLUDED_PERMISSION
+
+#include <string>
+
+class Permission
+{
+public:
+  Permission ();
+  Permission (const Permission&);
+  Permission& operator= (const Permission&);
+
+  void bigChange ()   { needConfirmation = true; }
+  void bigSequence () { needConfirmation = true; }
+  bool confirmed (const std::string&);
+
+private:
+  bool needConfirmation;
+  bool allConfirmed;
+};
+
+#endif
+////////////////////////////////////////////////////////////////////////////////