JS implementation of clipboard

clipboard_js.go

@@ -0,0 +1,57 @@
+package clipboard
+
+import (
+	"errors"
+	"sync"
+	"syscall/js"
+)
+
+func readAll() (string, error) {
+	var wg sync.WaitGroup
+	wg.Add(1)
+	var result string
+	var err error
+	promise := js.Global().Get("navigator").Get("clipboard").Call("readText").Call("then", js.FuncOf(func(me js.Value, args []js.Value) interface{} {
+		result = args[0].String()
+		wg.Done()
+		return nil
+	}), js.FuncOf(func(me js.Value, args []js.Value) interface{} {
+		err = errors.New(args[0].String())
+		wg.Done()
+		return nil
+	}))
+
+	if !promise.Truthy() {
+		return "", errors.New("No promise received by JS")
+	}
+
+	// Wait for promise to resolve
+	wg.Wait()
+
+	// Return value
+	return result, err
+}
+
+func writeAll(text string) error {
+	var wg sync.WaitGroup
+	wg.Add(1)
+	var err error
+	promise := js.Global().Get("navigator").Get("clipboard").Call("writeText", text).Call("then", js.FuncOf(func(me js.Value, args []js.Value) interface{} {
+		wg.Done()
+		return nil
+	}), js.FuncOf(func(me js.Value, args []js.Value) interface{} {
+		err = errors.New(args[0].String())
+		wg.Done()
+		return nil
+	}))
+
+	if !promise.Truthy() {
+		return errors.New("No promise received by JS")
+	}
+
+	// Wait for promise to resolve
+	wg.Wait()
+
+	// Return value
+	return err
+}