diff -r cf1b5f22dbd2 -r e63853509ad0 VirtualMailManager/cli/Config.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/VirtualMailManager/cli/Config.py	Sat Feb 06 18:42:05 2010 +0000
@@ -0,0 +1,82 @@
+# -*- coding: UTF-8 -*-
+# Copyright (c) 2010, Pascal Volk
+# See COPYING for distribution information.
+
+"""
+    VirtualMailManager.cli.CliConfig
+
+    Adds some interactive stuff to the Config class.
+"""
+
+from VirtualMailManager import ENCODING
+from VirtualMailManager.Config import Config 
+from VirtualMailManager.cli import w_std
+from VirtualMailManager.constants.ERROR import VMM_TOO_MANY_FAILURES
+
+class CliConfig(Config):
+    """Adds the interactive ``configure`` method to the `Config` class
+    and overwrites `LazyConfig.set(), in order to update a single option
+    in the configuration file with a single command line command.
+    """
+    def configure(self, sections):
+        """Interactive method for configuring all options of the given
+        iterable ``sections`` object."""
+        input_fmt = _(u'Enter new value for option %(option)s \
+[%(current_value)s]: ')
+        failures = 0
+
+        w_std(_(u'Using configuration file: %s\n') % self._cfgFileName)
+        for s in sections:
+            w_std(_(u'* Configuration section: “%s”') % s )
+            for opt, val in self.items(s):
+                failures = 0
+                while True:
+                    newval = raw_input(input_fmt.encode(ENCODING,'replace') %{
+                                       'option': opt, 'current_value': val})
+                    if newval and newval != val:
+                        try:
+                            LazyConfig.set('%s.%s' % (s, opt), newval)
+                            break
+                        except (ValueError, ConfigValueError), e:
+                            w_std(_(u'Warning: %s') % e)
+                            failures += 1
+                            if failures > 2:
+                                raise VMMConfigException(
+                                    _(u'Too many failures - try again later.'),
+                                    VMM_TOO_MANY_FAILURES)
+                    else:
+                        break
+            print
+        if self._modified:
+            self.__saveChanges()
+
+    def set(self, option, value):
+        """Set the value of an option.
+
+        If the new `value` has been set, the configuration file will be
+        immediately updated.
+
+        Throws a ``ValueError`` if `value` couldn't be converted to
+        ``LazyConfigOption.cls``"""
+        section, option_ = self._get_section_option(option)
+        val = self._cfg[section][option_].cls(value)
+        if not self._cfg[section][option_].validate is None:
+            val = self._cfg[section][option_].validate(val)
+        # Do not write default values also skip identical values
+        if not self._cfg[section][option_].default is None:
+            old_val = self.dget(option)
+        else:
+            old_val = self.pget(option)
+        if val == old_val:
+            return
+        if not RawConfigParser.has_section(self, section):
+            self.add_section(section)
+        RawConfigParser.set(self, section, option_, val)
+        self.__saveChanges()
+
+    def __saveChanges(self):
+        """Writes changes to the configuration file."""
+        copy2(self._cfgFileName, self._cfgFileName+'.bak')
+        self._cfgFile = open(self._cfgFileName, 'w')
+        self.write(self._cfgFile)
+        self._cfgFile.close()