Remote control: Allow matching windows by number (visible position).

Fixes #501

kitty/boss.py

@@ -149,10 +149,20 @@ class Boss:
             field, exp = match.split(':', 1)
         except ValueError:
             return
-        pat = re.compile(exp)
-        for window in self.all_windows:
-            if window.matches(field, pat):
-                yield window
+        if field == 'num':
+            tab = self.active_tab
+            if tab is not None:
+                try:
+                    w = tab.get_nth_window(int(exp))
+                except Exception:
+                    return
+                if w is not None:
+                    yield w
+        else:
+            pat = re.compile(exp)
+            for window in self.all_windows:
+                if window.matches(field, pat):
+                    yield window
 
     def tab_for_window(self, window):
         for tab in self.all_tabs:

kitty/cmds.py

@@ -39,10 +39,12 @@ def cmd(short_desc, desc=None, options_spec=None, no_response=False, argspec='..
 MATCH_WINDOW_OPTION = '''\
 --match -m
 The window to match. Match specifications are of the form:
-|_ field:regexp|. Where field can be one of: id, title, pid, cwd, cmdline.
+|_ field:regexp|. Where field can be one of: id, title, pid, cwd, cmdline, num.
 You can use the |_ ls| command to get a list of windows. Note that for
-numeric fields such as id and pid the expression is interpreted as a number,
-not a regular expression.
+numeric fields such as id, pid and num the expression is interpreted as a number,
+not a regular expression. The field num refers to the window position in the current tab,
+starting from zero and counting clockwise (this is the same as the order in which the
+windows are reported by the |_ ls| command).
 '''
 MATCH_TAB_OPTION = '''\
 --match -m

kitty/layout.py

@@ -75,9 +75,11 @@ class Layout:
         # this layout, i.e. spaces that are not covered by any window
         self.blank_rects = ()
 
-    def nth_window(self, all_windows, num):
+    def nth_window(self, all_windows, num, make_active=True):
         windows = process_overlaid_windows(all_windows)[1]
         w = windows[min(num, len(windows) - 1)]
+        if not make_active:
+            return w
         active_window_idx = idx_for_id(w.id, all_windows)
         return self.set_active_window(all_windows, active_window_idx)
 

kitty/tabs.py

@@ -183,6 +183,10 @@ class Tab:  # {{{
             return
         self.set_active_window_idx(idx)
 
+    def get_nth_window(self, n):
+        if self.windows:
+            return self.current_layout.nth_window(self.windows, n, make_active=False)
+
     def nth_window(self, num=0):
         if self.windows:
             self.active_window_idx = self.current_layout.nth_window(self.windows, num)