http://hg.logilab.org/logilab/common/rev/2029eb2dd071

--- optparser.py
+++ optparser.py
@@ -46,11 +46,11 @@
         self.min_args, self.max_args = 0, 1
 
     def add_command(self, name, mod_or_funcs, help=''):
-        """name of the command
-	name of module or tuple of functions (run, add_options)
-	"""
+        """name of the command, name of module or tuple of functions
+        (run, add_options)
+        """
         assert isinstance(mod_or_funcs, str) or isinstance(mod_or_funcs, tuple), \
-	       "mod_or_funcs has to be a module name or a tuple of functions"
+            "mod_or_funcs has to be a module name or a tuple of functions"
         self._commands[name] = (mod_or_funcs, help)
 
     def print_main_help(self):
@@ -64,7 +64,7 @@
             self.print_main_help()
             sys.exit(1)
         cmd = args[0]
-	args = args[1:]
+        args = args[1:]
         if cmd not in self._commands:
             if cmd in ('-h', '--help'):
                 self.print_main_help()
@@ -79,8 +79,8 @@
         self.description = help
         if isinstance(mod_or_f, str):
             exec 'from %s import run, add_options' % mod_or_f
-	else:
-	    run, add_options = mod_or_f
+        else:
+            run, add_options = mod_or_f
         add_options(self)
         (options, args) = self.parse_args(args)
         if not (self.min_args <= len(args) <= self.max_args):