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diff --git a/src/common.py b/src/common.py
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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+'''
+pytagomacs – An Emacs like key–value editor library for Python
+
+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/>.
+'''
+
+
+
+INACTIVE_COLOUR = '34'
+'''
+:str?  The colour of an inactive line
+'''
+
+ACTIVE_COLOUR = '01;34'
+'''
+:str?  The colour of an active line
+'''
+
+SELECTED_COLOUR = '44;37'
+'''
+:str?  The colour of a selected text
+'''
+
+STATUS_COLOUR = '07'
+'''
+:str?  The colour of the status bar
+'''
+
+ALERT_COLOUR = None
+'''
+:str?  The colour of the alert message
+'''
+
+
+atleast = lambda x, minimum : (x is not None) and (x >= minimum)
+'''
+Test that a value is defined and of at least a minimum value
+'''
+
+limit = lambda x_min, x, x_max : min(max(x_min, x), x_max)
+'''
+Limit a value to a closed set
+'''
+
+ctrl = lambda key : chr(ord(key) ^ ord('@'))
+'''
+Return the symbol for a specific letter pressed in combination with Ctrl
+'''
+
+backspace = lambda x : (ord(x) == 127) or (ord(x) == 8)
+'''
+Check if a key stroke is a backspace key stroke
+'''
+
+
+
+class Jump():
+    '''
+    Create a cursor jump that can either be included in a print statement
+    as a string or invoked
+    
+    @param   y:int         The row, 1 based
+    @param   x:int         The column, 1 based
+    @string  :str|()→void  Functor that can be treated as a string for jumping
+    '''
+    def __init__(self, y, x):
+        self.string = '\033[%i;%iH' % (y, x)
+    def __str__(self):
+        return self.string
+    def __call__(self):
+        print(self.string, end = '')
+