Add notification for input from a pane, from George Nachman.

control-notify.c

@@ -24,6 +24,35 @@
 #define CONTROL_SHOULD_NOTIFY_CLIENT(c) \
 	((c) != NULL && ((c)->flags & CLIENT_CONTROL))
 
+void
+control_notify_input(struct client *c, struct window_pane *wp,
+    struct evbuffer *input)
+{
+	u_char		*buf;
+	size_t		 len;
+	struct evbuffer *message;
+	u_int		 i;
+
+	if (c->session == NULL)
+	    return;
+
+	buf = EVBUFFER_DATA(input);
+	len = EVBUFFER_LENGTH(input);
+
+	/*
+	 * Only write input if the window pane is linked to a window belonging
+	 * to the client's session.
+	 */
+	if (winlink_find_by_window(&c->session->windows, wp->window) != NULL) {
+		message = evbuffer_new();
+		evbuffer_add_printf(message, "%%output %%%u ", wp->id);
+		for (i = 0; i < len; i++)
+			evbuffer_add_printf(message, "%02hhx", buf[i]);
+		control_write_buffer(c, message);
+		evbuffer_free(message);
+	}
+}
+
 void
 control_notify_window_layout_changed(struct window *w)
 {

input.c

@@ -752,6 +752,7 @@ input_parse(struct window_pane *wp)
 
 	buf = EVBUFFER_DATA(evb);
 	len = EVBUFFER_LENGTH(evb);
+	notify_input(wp, evb);
 	off = 0;
 
 	/* Parse the input. */

notify.c

@@ -132,6 +132,26 @@ notify_drain(void)
 	}
 }
 
+void
+notify_input(struct window_pane *wp, struct evbuffer *input)
+{
+	struct client	*c;
+	u_int		 i;
+
+	/*
+	 * notify_input() is not queued and only does anything when
+	 * notifications are enabled.
+	 */
+	if (!notify_enabled)
+		return;
+
+	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
+		c = ARRAY_ITEM(&clients, i);
+		if (c != NULL && (c->flags & CLIENT_CONTROL))
+			control_notify_input(c, wp, input);
+	}
+}
+
 void
 notify_window_layout_changed(struct window *w)
 {

tmux.h

@@ -1531,6 +1531,7 @@ enum mode_key_cmd mode_key_lookup(struct mode_key_data *, int);
 /* notify.c */
 void	notify_enable(void);
 void	notify_disable(void);
+void	notify_input(struct window_pane *, struct evbuffer *);
 void	notify_window_layout_changed(struct window *);
 void	notify_window_unlinked(struct session *, struct window *);
 void	notify_window_linked(struct session *, struct window *);
@@ -2224,6 +2225,8 @@ void printflike2 control_write(struct client *, const char *, ...);
 void	control_write_buffer(struct client *, struct evbuffer *);
 
 /* control-notify.c */
+void	control_notify_input(struct client *, struct window_pane *,
+	    struct evbuffer *);
 void	control_notify_window_layout_changed(struct window *);
 void	control_notify_window_unlinked(struct session *, struct window *);
 void	control_notify_window_linked(struct session *, struct window *);