[PATCH] Add format for server sessions count

[Magnus Groß]

This can be useful for example when the user wants to show the total
number of sessions in the statusline.

Co-authored-by: Magnus Groß <mag...@mggross.com>
---
format.c | 10 ++++++++++
server.c | 15 +++++++++++++++
tmux.1 | 1 +
tmux.h | 1 +
4 files changed, 27 insertions(+)

diff --git a/format.c b/format.c
index 275d5218..e5728327 100644
--- a/format.c
+++ b/format.c
@@ -2077,6 +2077,13 @@ format_cb_scroll_region_upper(struct format_tree *ft)
return (NULL);
}

+/* Callback for server_sessions. */
+static void *
+format_cb_server_sessions(__unused struct format_tree *ft)
+{
+ return (format_printf("%u", server_sessions_count()));
+}
+
/* Callback for session_attached. */
static void *
format_cb_session_attached(struct format_tree *ft)
@@ -2980,6 +2987,9 @@ static const struct format_table_entry format_table[] = {
{ "scroll_region_upper", FORMAT_TABLE_STRING,
format_cb_scroll_region_upper
},
+ { "server_sessions", FORMAT_TABLE_STRING,
+ format_cb_server_sessions
+ },
{ "session_activity", FORMAT_TABLE_TIME,
format_cb_session_activity
},
diff --git a/server.c b/server.c
index 6fef468b..a0b62a71 100644
--- a/server.c
+++ b/server.c
@@ -555,3 +555,18 @@ server_add_message(const char *fmt, ...)
free(msg);
}
}
+
+/* Count number of sessions. */
+u_int
+server_sessions_count()
+{
+ struct session *s;
+ u_int n = 0;
+
+ n = 0;
+ RB_FOREACH(s, sessions, &sessions) {
+ n++;
+ }
+
+ return (n);
+}
diff --git a/tmux.1 b/tmux.1
index 92e2915f..7bf2bc4d 100644
--- a/tmux.1
+++ b/tmux.1
@@ -5278,6 +5278,7 @@ The following variables are available, where appropriate:
.It Li "selection_present" Ta "" Ta "1 if selection started in copy mode"
.It Li "selection_start_x" Ta "" Ta "X position of the start of the selection"
.It Li "selection_start_y" Ta "" Ta "Y position of the start of the selection"
+.It Li "server_sessions" Ta "" Ta "Number of sessions"
.It Li "session_activity" Ta "" Ta "Time of session last activity"
.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"
diff --git a/tmux.h b/tmux.h
index e2becb1c..1a4a14ee 100644
--- a/tmux.h
+++ b/tmux.h
@@ -2653,6 +2653,7 @@ void server_update_socket(void);
void server_add_accept(int);
void printflike(1, 2) server_add_message(const char *, ...);
int server_create_socket(int, char **);
+u_int server_sessions_count(void);

/* server-client.c */
RB_PROTOTYPE(client_windows, client_window, entry, server_client_window_cmp);
--
2.40.1

[Nicholas Marriott]

Thanks, I have applied this but I just rolled server_sessions_count into
format.c instead of having a separate function to use once. It'll be in
GitHub next time it syncs up.

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