From fa71e9a07911715da596d618fe045943337c596b Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Tue, 22 Feb 2022 11:10:41 +0000
Subject: Add next_session_id format with the next session ID, GitHub issue
 3078.

---
 format.c  | 10 ++++++++++
 session.c |  2 +-
 tmux.1    |  6 ++++++
 tmux.h    |  1 +
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/format.c b/format.c
index b34fc341..15f3179c 100644
--- a/format.c
+++ b/format.c
@@ -1650,6 +1650,13 @@ format_cb_mouse_y(struct format_tree *ft)
 	return (NULL);
 }
 
+/* Callback for next_session_id. */
+static void *
+format_cb_next_session_id(__unused struct format_tree *ft)
+{
+	return (format_printf("$%u", next_session_id));
+}
+
 /* Callback for origin_flag. */
 static void *
 format_cb_origin_flag(struct format_tree *ft)
@@ -2707,6 +2714,9 @@ static const struct format_table_entry format_table[] = {
 	{ "mouse_y", FORMAT_TABLE_STRING,
 	  format_cb_mouse_y
 	},
+	{ "next_session_id", FORMAT_TABLE_STRING,
+	  format_cb_next_session_id
+	},
 	{ "origin_flag", FORMAT_TABLE_STRING,
 	  format_cb_origin_flag
 	},
diff --git a/session.c b/session.c
index fd567926..9b9b0d9c 100644
--- a/session.c
+++ b/session.c
@@ -29,7 +29,7 @@
 #include "tmux.h"
 
 struct sessions		sessions;
-static u_int		next_session_id;
+u_int			next_session_id;
 struct session_groups	session_groups = RB_INITIALIZER(&session_groups);
 
 static void	session_free(int, short, void *);
diff --git a/tmux.1 b/tmux.1
index c9c9f221..22eb6b1f 100644
--- a/tmux.1
+++ b/tmux.1
@@ -4589,6 +4589,11 @@ Run when a session is renamed.
 Run when a window is linked into a session.
 .It window-renamed
 Run when a window is renamed.
+.It window-resized
+Run when a window is resized.
+This may be after the
+.Ar client-resized
+hook is run.
 .It window-unlinked
 Run when a window is unlinked from a session.
 .El
@@ -5093,6 +5098,7 @@ The following variables are available, where appropriate:
 .It Li "mouse_word" Ta "" Ta "Word under mouse, if any"
 .It Li "mouse_x" Ta "" Ta "Mouse X position, if any"
 .It Li "mouse_y" Ta "" Ta "Mouse Y position, if any"
+.It Li "next_session_id" Ta "" Ta "Unique session ID for next new session"
 .It Li "origin_flag" Ta "" Ta "Pane origin flag"
 .It Li "pane_active" Ta "" Ta "1 if active pane"
 .It Li "pane_at_bottom" Ta "" Ta "1 if pane is at the bottom of window"
diff --git a/tmux.h b/tmux.h
index fa5b6b50..7a83732e 100644
--- a/tmux.h
+++ b/tmux.h
@@ -3118,6 +3118,7 @@ void	control_notify_session_window_changed(struct session *);
 
 /* session.c */
 extern struct sessions sessions;
+extern u_int next_session_id;
 int	session_cmp(struct session *, struct session *);
 RB_PROTOTYPE(sessions, session, entry, session_cmp);
 int		 session_alive(struct session *);
-- 
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