===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/format.c,v
retrieving revision 1.65
retrieving revision 1.66
diff -c -r1.65 -r1.66
*** src/usr.bin/tmux/format.c	2015/05/08 16:18:04	1.65
--- src/usr.bin/tmux/format.c	2015/05/12 15:29:29	1.66
***************
*** 1,4 ****
! /* $OpenBSD: format.c,v 1.65 2015/05/08 16:18:04 nicm Exp $ */
  
  /*
   * Copyright (c) 2011 Nicholas Marriott <nicm@users.sourceforge.net>
--- 1,4 ----
! /* $OpenBSD: format.c,v 1.66 2015/05/12 15:29:29 nicm Exp $ */
  
  /*
   * Copyright (c) 2011 Nicholas Marriott <nicm@users.sourceforge.net>
***************
*** 494,499 ****
--- 494,501 ----
  {
  	struct session_group	*sg;
  	time_t			 t;
+ 	struct winlink		*wl;
+ 	char			 alerts[256], tmp[16];
  
  	ft->s = s;
  
***************
*** 518,523 ****
--- 520,543 ----
  
  	format_add(ft, "session_attached", "%u", s->attached);
  	format_add(ft, "session_many_attached", "%d", s->attached > 1);
+ 
+ 	*alerts = '\0';
+ 	RB_FOREACH (wl, winlinks, &s->windows) {
+ 		if ((wl->flags & WINLINK_ALERTFLAGS) == 0)
+ 			continue;
+ 		snprintf(tmp, sizeof tmp, "%u", wl->idx);
+ 
+ 		if (*alerts != '\0')
+ 			strlcat(alerts, ",", sizeof alerts);
+ 		strlcat(alerts, tmp, sizeof alerts);
+ 		if (wl->flags & WINLINK_ACTIVITY)
+ 			strlcat(alerts, "#", sizeof alerts);
+ 		if (wl->flags & WINLINK_BELL)
+ 			strlcat(alerts, "!", sizeof alerts);
+ 		if (wl->flags & WINLINK_SILENCE)
+ 			strlcat(alerts, "~", sizeof alerts);
+ 	}
+ 	format_add(ft, "session_alerts", "%s", alerts);
  }
  
  /* Set default format keys for a client. */