chore: vendor clipboard into go package

packages/tui/clipboard/example_test.go

@@ -0,0 +1,56 @@
+// Copyright 2021 The golang.design Initiative Authors.
+// All rights reserved. Use of this source code is governed
+// by a MIT license that can be found in the LICENSE file.
+//
+// Written by Changkun Ou <changkun.de>
+
+//go:build cgo
+
+package clipboard_test
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"golang.design/x/clipboard"
+)
+
+func ExampleWrite() {
+	err := clipboard.Init()
+	if err != nil {
+		panic(err)
+	}
+
+	clipboard.Write(clipboard.FmtText, []byte("Hello, 世界"))
+	// Output:
+}
+
+func ExampleRead() {
+	err := clipboard.Init()
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(string(clipboard.Read(clipboard.FmtText)))
+	// Output:
+	// Hello, 世界
+}
+
+func ExampleWatch() {
+	err := clipboard.Init()
+	if err != nil {
+		panic(err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
+	defer cancel()
+
+	changed := clipboard.Watch(context.Background(), clipboard.FmtText)
+	go func(ctx context.Context) {
+		clipboard.Write(clipboard.FmtText, []byte("你好，world"))
+	}(ctx)
+	fmt.Println(string(<-changed))
+	// Output:
+	// 你好，world
+}