core: add screenshot utility

core/internal/wayland/client/helpers.go

@@ -0,0 +1,26 @@
+package client
+
+import wlclient "github.com/AvengeMedia/DankMaterialShell/core/pkg/go-wayland/wayland/client"
+
+func Roundtrip(display *wlclient.Display, ctx *wlclient.Context) error {
+	callback, err := display.Sync()
+	if err != nil {
+		return err
+	}
+
+	done := make(chan struct{})
+	callback.SetDoneHandler(func(e wlclient.CallbackDoneEvent) {
+		close(done)
+	})
+
+	for {
+		select {
+		case <-done:
+			return nil
+		default:
+			if err := ctx.Dispatch(); err != nil {
+				return err
+			}
+		}
+	}
+}