57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
// Package clipboard wraps golang.design/x/clipboard with lazy initialization.
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//
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// Why a wrapper:
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// - The upstream library requires a one-time clipboard.Init() call. Hiding it
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// here keeps the application service free of init concerns.
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// - Allows future swap to a different backend (e.g. atotto/clipboard) without
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// changing callers.
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package clipboard
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import (
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"fmt"
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"sync"
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"golang.design/x/clipboard"
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)
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// Writer abstracts clipboard writes for testability.
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type Writer interface {
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WriteText(s string) error
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WriteImage(pngBytes []byte) error
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}
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type clipWriter struct {
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once sync.Once
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initErr error
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}
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// New returns a process-wide clipboard writer. Initialization is lazy.
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func New() Writer {
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return &clipWriter{}
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}
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func (w *clipWriter) ensureInit() error {
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w.once.Do(func() {
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w.initErr = clipboard.Init()
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})
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return w.initErr
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}
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// WriteText replaces the clipboard contents with the supplied UTF-8 string.
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func (w *clipWriter) WriteText(s string) error {
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if err := w.ensureInit(); err != nil {
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return fmt.Errorf("clipboard init: %w", err)
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}
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clipboard.Write(clipboard.FmtText, []byte(s))
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return nil
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}
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// WriteImage replaces the clipboard contents with PNG-encoded image data.
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func (w *clipWriter) WriteImage(pngBytes []byte) error {
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if err := w.ensureInit(); err != nil {
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return fmt.Errorf("clipboard init: %w", err)
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}
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clipboard.Write(clipboard.FmtImage, pngBytes)
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return nil
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}
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