Add /wup command

The `/wup` command selects a tab by the prefix of its name only.

The `/win` will do a substring match based on the first tab
going from the current tab which matches the substring. This can
be confusing, especially since `/win` matches on different types
of tab "names" not only on the name which is shown in the info bar
by default.

The `/wup` command exclusively matches based on the prefix of the
tab.name string. This has the advantage that it is consistent,
deterministic and independent of the currently selected tab.

doc/source/commands.rst

@@ -93,6 +93,15 @@ These commands work in *any* tab.
         Go to the matching tab.  If the argument is a number, it goes to the tab with that number.
         Otherwise, it goes to the next tab whose name contains the given string.
 
+    /wup
+
+        **Usage:** ``/wup <prefix>``
+
+        Go to the tab whose name starts with `prefix`. If multiple tabs start
+        with that prefix, no action is taken.
+
+        (Mnemonic: Window by Unique Prefix)
+
     /status
         **Usage:** ``/status <availability> [status message]``
 

poezio/core/commands.py

@@ -219,6 +219,20 @@ class CommandCore:
                 return
             self.core.tabs.set_current_tab(match)
 
+    @command_args_parser.quoted(1)
+    def wup(self, args):
+        """
+        /wup <prefix of name>
+        """
+        if args is None:
+            return self.help('wup')
+
+        prefix = args[0]
+        _, match = self.core.tabs.find_by_unique_prefix(prefix)
+        if match is None:
+            return
+        self.core.tabs.set_current_tab(match)
+
     @command_args_parser.quoted(2)
     def move_tab(self, args):
         """

poezio/core/core.py

@@ -1709,6 +1709,12 @@ class Core:
             usage='<number or name>',
             shortdesc='Go to the specified room',
             completion=self.completion.win)
+        self.register_command(
+            'wup',
+            self.command.wup,
+            usage='<prefix>',
+            shortdesc='Go to the tab whose name uniquely starts with prefix',
+            completion=self.completion.win)
         self.commands['w'] = self.commands['win']
         self.register_command(
             'move_tab',

poezio/core/tabs.py

@@ -29,6 +29,7 @@ from collections import defaultdict
 from slixmpp import JID
 from poezio import tabs
 from poezio.events import EventHandler
+from poezio.config import config
 
 
 class Tabs: