From e4c91d232856903db0251852f639b6fedcb1d98b Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Sat, 25 Feb 2023 10:32:27 -0800
Subject: [PATCH] don't require runtimes to implement all callbacks

---
 src/Surface.zig | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/Surface.zig b/src/Surface.zig
index 2b72691a6..aacac1fec 100644
--- a/src/Surface.zig
+++ b/src/Surface.zig
@@ -917,8 +917,17 @@ pub fn keyCallback(
                     }, .{ .instant = {} });
                 },
 
-                .previous_tab => self.rt_surface.gotoPreviousTab(),
-                .next_tab => self.rt_surface.gotoNextTab(),
+                .previous_tab => {
+                    if (@hasDecl(apprt.Surface, "gotoPreviousTab")) {
+                        self.rt_surface.gotoPreviousTab();
+                    } else log.warn("runtime doesn't implement gotoPreviousTab", .{});
+                },
+
+                .next_tab => {
+                    if (@hasDecl(apprt.Surface, "gotoNextTab")) {
+                        self.rt_surface.gotoNextTab();
+                    } else log.warn("runtime doesn't implement gotoNextTab", .{});
+                },
 
                 .close_window => {
                     _ = self.app_mailbox.push(.{ .close = self }, .{ .instant = {} });