From bcc47add38b1cea3b94721e9d28eaedbda0a9b1a Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Thu, 10 Oct 2024 10:41:33 +0000
Subject: [PATCH] Add a sixel_support format variable which is 1 if SIXEL is
 supported (always 0 on OpenBSD), requested by Misaki Masa in GitHub issue
 4177

---
 format.c | 10 ++++++++++
 tmux.1   |  1 +
 2 files changed, 11 insertions(+)

diff --git a/format.c b/format.c
index 70ca142d..28a57b24 100644
--- a/format.c
+++ b/format.c
@@ -2320,6 +2320,13 @@ format_cb_version(__unused struct format_tree *ft)
 	return (xstrdup(getversion()));
 }
 
+/* Callback for sixel_support. */
+static void *
+format_cb_sixel_support(__unused struct format_tree *ft)
+{
+	return (xstrdup("0"));
+}
+
 /* Callback for active_window_index. */
 static void *
 format_cb_active_window_index(struct format_tree *ft)
@@ -3147,6 +3154,9 @@ static const struct format_table_entry format_table[] = {
 	{ "session_windows", FORMAT_TABLE_STRING,
 	  format_cb_session_windows
 	},
+	{ "sixel_support", FORMAT_TABLE_STRING,
+	  format_cb_sixel_support
+	},
 	{ "socket_path", FORMAT_TABLE_STRING,
 	  format_cb_socket_path
 	},
diff --git a/tmux.1 b/tmux.1
index 26758bbe..d369ff4c 100644
--- a/tmux.1
+++ b/tmux.1
@@ -5954,6 +5954,7 @@ The following variables are available, where appropriate:
 .It Li "session_stack" Ta "" Ta "Window indexes in most recent order"
 .It Li "session_windows" Ta "" Ta "Number of windows in session"
 .It Li "socket_path" Ta "" Ta "Server socket path"
+.It Li "sixel_support" Ta "" Ta "1 if server has support for SIXEL"
 .It Li "start_time" Ta "" Ta "Server start time"
 .It Li "uid" Ta "" Ta "Server UID"
 .It Li "user" Ta "" Ta "Server user"