lemonbar: Trigger formatting on mode cycle and i3ws events

.i3/lemonbar/i3_workspaces.py

@@ -60,6 +60,7 @@ class i3ws(object):
         # Callback functions have argument i3ws
         self.change_callbacks  = []
         self.focus_callbacks   = []
+        self.final_callback    = None # Called after all other callbacks
 
     def work(self):
         # While loop to restart connection as long as there is an i3 ipc socket
@@ -124,6 +125,9 @@ class i3ws(object):
         for cb in self.change_callbacks:
             cb(self)
 
+        if self.final_callback: # TODO ideally this would not be called on change if win_focused comes right after
+            self.final_callback(self)
+
     def win_focused(self, i3, e):
         self.focused_window = i3.get_tree().find_focused()
         name = self.focused_window.name
@@ -134,6 +138,9 @@ class i3ws(object):
         for cb in self.focus_callbacks:
             cb(self)
 
+        if self.final_callback:
+            self.final_callback(self)
+
     def format(self, workspaces, outputs):
         # Formats the text according to the workspace data given.
         # Only important when running in free standing mode