From ec34439f9cddcbde78d5fa2c628e454d2df5dd53 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Tue, 12 May 2015 15:29:29 +0000
Subject: [PATCH] Add a session_alerts format which is a list of all the alerts
 in the current session in symbolic form (something like "0!,4~,5!"). Use this
 in the default set-titles-string. Prompted by a request from Jan ONDREJ.

---
 format.c        | 20 ++++++++++++++++++++
 options-table.c |  2 +-
 tmux.1          |  1 +
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/format.c b/format.c
index 39351fc3..db6f9231 100644
--- a/format.c
+++ b/format.c
@@ -494,6 +494,8 @@ format_defaults_session(struct format_tree *ft, struct session *s)
 {
 	struct session_group	*sg;
 	time_t			 t;
+	struct winlink		*wl;
+	char			 alerts[256], tmp[16];
 
 	ft->s = s;
 
@@ -518,6 +520,24 @@ format_defaults_session(struct format_tree *ft, struct session *s)
 
 	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. */
diff --git a/options-table.c b/options-table.c
index 44d36dca..4ad45d37 100644
--- a/options-table.c
+++ b/options-table.c
@@ -296,7 +296,7 @@ const struct options_table_entry session_options_table[] = {
 
 	{ .name = "set-titles-string",
 	  .type = OPTIONS_TABLE_STRING,
-	  .default_str = "#S:#I:#W - \"#T\""
+	  .default_str = "#S:#I:#W - \"#T\" #{session_alerts}"
 	},
 
 	{ .name = "status",
diff --git a/tmux.1 b/tmux.1
index 7d9c0dc8..f5a0aaa3 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3304,6 +3304,7 @@ The following variables are available, where appropriate:
 .It Li "pane_width" Ta "" Ta "Width of pane"
 .It Li "scroll_region_lower" Ta "" Ta "Bottom of scroll region in pane"
 .It Li "scroll_region_upper" Ta "" Ta "Top of scroll region in pane"
+.It Li "session_alerts" Ta "" Ta "List of window indexes with alerts"
 .It Li "session_attached" Ta "" Ta "Number of clients session is attached to"
 .It Li "session_activity" Ta "" Ta "Integer time of session last activity"
 .It Li "session_activity_string" Ta "" Ta "String time of session last activity"