Fix #2503/4 (use “.” as an alias for the current tab in /move_tab)

doc/source/commands.rst

@@ -141,12 +141,14 @@ These commands work in *any* tab.
     /move_tab
         **Usage:** ``/move_tab <source> <destination>``
 
-        Move tab <source> to <destination>. If
-        the create_gaps option is true, then it will leave a gap at the <source>
-        position, leading to usual behaviour. If create_gaps is not enabled, then the
-        tabs will number from 0 to your actual tab number, without gaps (which means
+        Move tab <source> to <destination>. If the :term:`create_gaps` option
+        is true, then it will leave a gap at the <source> position, leading
+        to usual behaviour. If create_gaps is not enabled, then the tabs will
+        number from 0 to your actual tab number, without gaps (which means
         their number will change if you close a tab on the left of the list).
 
+        A value of ``.`` for a parameter means the current tab.
+
     /theme
         **Usage:** ``/theme [theme_name]``
 

src/core/commands.py

@@ -218,6 +218,12 @@ def command_move_tab(self, arg):
     current_tab = self.current_tab()
     if len(args) != 2:
         return self.command_help('move_tab')
+
+    if args[0] == '.':
+        args[0] = current_tab.nb
+    if args[1] == '.':
+        args[1] = current_tab.nb
+
     def get_nb_from_value(value):
         ref = None
         try:

src/core/core.py

@@ -1466,7 +1466,8 @@ class Core(object):
                     "<destination>. This will make the following tabs shift in"
                     " some cases (refer to the documentation). A tab can be "
                     "designated by its number or by the beginning of its "
-                    "address."),
+                    "address. You can use \".\" as a shortcut for the current "
+                    "tab."),
                 shortdesc=_('Move a tab.'),
                 completion=self.completion_move_tab)
         self.register_command('show', self.command_status,