Add a format for the name of the pane's mode, lets it be used as a

conditional for key bindings.

format.c

@@ -1371,6 +1371,9 @@ format_defaults_pane(struct format_tree *ft, struct window_pane *wp)
 	}
 
 	format_add(ft, "pane_in_mode", "%d", wp->screen != &wp->base);
+	if (wp->mode != NULL)
+		format_add(ft, "pane_mode", "%s", wp->mode->name);
+
 	format_add(ft, "pane_synchronized", "%d",
 	    !!options_get_number(wp->window->options, "synchronize-panes"));
 	format_add(ft, "pane_search_string", "%s",

tmux.1

@@ -3561,6 +3561,7 @@ The following variables are available, where appropriate:
 .It Li "pane_input_off" Ta "" Ta "If input to pane is disabled"
 .It Li "pane_index" Ta "#P" Ta "Index of pane"
 .It Li "pane_left" Ta "" Ta "Left of pane"
+.It Li "pane_mode" Ta "" Ta "Name of pane mode, if any."
 .It Li "pane_pid" Ta "" Ta "PID of first process in pane"
 .It Li "pane_right" Ta "" Ta "Right of pane"
 .It Li "pane_search_string" Ta "" Ta "Last search string in copy mode"

tmux.h

@@ -689,15 +689,18 @@ struct screen_write_ctx {
  * right function to handle input and output.
  */
 struct window_mode {
-	struct screen *(*init)(struct window_pane *);
+	const char	*name;
-	void	(*free)(struct window_pane *);
-	void	(*resize)(struct window_pane *, u_int, u_int);
-	void	(*key)(struct window_pane *, struct client *, struct session *,
-		    key_code, struct mouse_event *);
 
-	const char *(*key_table)(struct window_pane *);
+	struct screen	*(*init)(struct window_pane *);
-	void	(*command)(struct window_pane *, struct client *,
+	void		 (*free)(struct window_pane *);
-		    struct session *, struct args *, struct mouse_event *);
+	void		 (*resize)(struct window_pane *, u_int, u_int);
+	void		 (*key)(struct window_pane *, struct client *,
+			     struct session *, key_code, struct mouse_event *);
+
+	const char	*(*key_table)(struct window_pane *);
+	void		 (*command)(struct window_pane *, struct client *,
+			     struct session *, struct args *,
+			     struct mouse_event *);
 };
 #define WINDOW_MODE_TIMEOUT 180
 

window-choose.c

@@ -57,6 +57,8 @@ enum window_choose_input_type {
 };
 
 const struct window_mode window_choose_mode = {
+	.name = "choose-mode",
+
 	.init = window_choose_init,
 	.free = window_choose_free,
 	.resize = window_choose_resize,

window-clock.c

@@ -34,6 +34,8 @@ static void	window_clock_timer_callback(int, short, void *);
 static void	window_clock_draw_screen(struct window_pane *);
 
 const struct window_mode window_clock_mode = {
+	.name = "clock-mode",
+
 	.init = window_clock_init,
 	.free = window_clock_free,
 	.resize = window_clock_resize,

window-copy.c

@@ -105,6 +105,8 @@ static void	window_copy_move_mouse(struct mouse_event *);
 static void	window_copy_drag_update(struct client *, struct mouse_event *);
 
 const struct window_mode window_copy_mode = {
+	.name = "copy-mode",
+
 	.init = window_copy_init,
 	.free = window_copy_free,
 	.resize = window_copy_resize,