apprt/glfw: exit with invalid CLI args

src/App.zig

@@ -231,10 +231,19 @@ fn drainMailbox(self: *App, rt_app: *apprt.App) !void {
             .open_config => try self.performAction(rt_app, .open_config),
             .new_window => |msg| try self.newWindow(rt_app, msg),
             .close => |surface| self.closeSurface(surface),
-            .quit => self.setQuit(),
             .surface_message => |msg| try self.surfaceMessage(msg.surface, msg.message),
             .redraw_surface => |surface| self.redrawSurface(rt_app, surface),
             .redraw_inspector => |surface| self.redrawInspector(rt_app, surface),
+
+            // If we're quitting, then we set the quit flag and stop
+            // draining the mailbox immediately. This lets us defer
+            // mailbox processing to the next tick so that the apprt
+            // can try to quick as quickly as possible.
+            .quit => {
+                log.info("quit message received, short circuiting mailbox drain", .{});
+                self.setQuit();
+                return;
+            },
         }
     }
 }

src/apprt/glfw.zig

@@ -11,6 +11,7 @@ const Allocator = std.mem.Allocator;
 const glfw = @import("glfw");
 const macos = @import("macos");
 const objc = @import("objc");
+const cli = @import("../cli.zig");
 const input = @import("../input.zig");
 const internal_os = @import("../os/main.zig");
 const renderer = @import("../renderer.zig");
@@ -77,9 +78,18 @@ pub const App = struct {
                 log.warn("configuration error: {s}", .{buf.items});
                 buf.clearRetainingCapacity();
             }
+
+            // If we have any CLI errors, exit.
+            if (config._diagnostics.containsLocation(.cli)) {
+                log.warn("CLI errors detected, exiting", .{});
+                _ = core_app.mailbox.push(.{
+                    .quit = {},
+                }, .{ .forever = {} });
+            }
         }
 
         // Queue a single new window that starts on launch
+        // Note: above we may send a quit so this may never happen
         _ = core_app.mailbox.push(.{
             .new_window = .{},
         }, .{ .forever = {} });