introduce a new class for undo and redo

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/editring.py b/src/editring.py
new file mode 100644
index 0000000..c466234
--- /dev/null
+++ b/src/editring.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+'''
+featherweight – A lightweight terminal news feed reader
+
+Copyright © 2013  Mattias Andrée (maandree@member.fsf.org)
+
+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 3 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, see <http://www.gnu.org/licenses/>.
+'''
+
+
+class Editring():
+    '''
+    Editing ring class
+    '''
+    
+    def __init__(self, limit = 100):
+        '''
+        Constructor
+        
+        @param  limit:int  The maximum size of the ring
+        '''
+        self.editring, self.editmax, self.editptr, self.editdir = [], limit, 0, -1
+    
+    
+    def is_empty(self):
+        '''
+        Checks if the editing is empty
+        
+        @return  :bool  Whether the editring is empty
+        '''
+        return len(self.editring) == 0
+