i3-companion: add a command to open a new workspace

This is quite a generic idea: use tick to trigger some actions without
spawning a whole Python process.

bin/i3-companion

@@ -112,6 +112,18 @@ def workspace_rename(i3, event):
     i3.command(';'.join(commands))
 
 
+def new_workspace(i3, event):
+    """Create a new workspace."""
+    if event.payload != "new-workspace":
+        return
+
+    workspace_nums = {w.num for w in i3.get_workspaces()}
+    max_num = max(workspace_nums)
+    available = (set(range(1, max_num + 2)) - workspace_nums).pop()
+    logger.info(f'create new workspace number {available}')
+    i3.command(f'workspace number "{available}"')
+
+
 if __name__ == "__main__":
     options = parse_args()
     setup_logging(options)
@@ -125,6 +137,9 @@ if __name__ == "__main__":
                       Event.WINDOW_CLOSE}:
             i3.on(event, workspace_rename)
 
+        # Create a new workspace
+        i3.on(Event.TICK, new_workspace)
+
         i3.main()
     except Exception as e:
         logger.exception("%s", e)

config

@@ -121,6 +121,7 @@ bindsym $mod+8 workspace number $ws8
 bindsym $mod+9 workspace number $ws9
 bindsym $mod+0 workspace number $ws10
 bindsym $mod+Tab workspace back_and_forth
+bindsym $mod+n exec i3-msg -t send_tick new-workspace
 
 # move focused container to workspace
 bindsym $mod+Shift+1 move container to workspace number $ws1