init commit

internal/clipboard/clipboard.go

@@ -0,0 +1,13 @@
+package clipboard
+
+import "context"
+
+// Clipboard provides an interface for clipboard operations
+type Clipboard interface {
+	// Read returns the current clipboard content
+	Read() (string, error)
+	// Write sets the clipboard content
+	Write(content string) error
+	// Watch returns a channel that emits clipboard changes
+	Watch(ctx context.Context) <-chan string
+}

internal/clipboard/detector.go

@@ -0,0 +1,39 @@
+package clipboard
+
+import "os"
+
+type DisplayServer int
+
+const (
+	DisplayServerUnknown DisplayServer = iota
+	DisplayServerX11
+	DisplayServerWayland
+)
+
+// Detect returns the current display server type
+func Detect() DisplayServer {
+	// Check for Wayland first
+	if os.Getenv("WAYLAND_DISPLAY") != "" {
+		return DisplayServerWayland
+	}
+
+	// Check for X11
+	if os.Getenv("DISPLAY") != "" {
+		return DisplayServerX11
+	}
+
+	return DisplayServerUnknown
+}
+
+// New creates a clipboard implementation for the current display server
+func New() (Clipboard, error) {
+	switch Detect() {
+	case DisplayServerWayland:
+		return NewWayland()
+	case DisplayServerX11:
+		return NewX11()
+	default:
+		// Try X11 as fallback
+		return NewX11()
+	}
+}

internal/clipboard/wayland.go

@@ -0,0 +1,77 @@
+package clipboard
+
+import (
+	"bufio"
+	"context"
+	"os/exec"
+	"strings"
+)
+
+type WaylandClipboard struct{}
+
+func NewWayland() (*WaylandClipboard, error) {
+	// Check if wl-paste is available
+	if _, err := exec.LookPath("wl-paste"); err != nil {
+		return nil, err
+	}
+	if _, err := exec.LookPath("wl-copy"); err != nil {
+		return nil, err
+	}
+	return &WaylandClipboard{}, nil
+}
+
+func (c *WaylandClipboard) Read() (string, error) {
+	cmd := exec.Command("wl-paste", "--no-newline")
+	output, err := cmd.Output()
+	if err != nil {
+		// wl-paste returns error if clipboard is empty
+		return "", nil
+	}
+	return string(output), nil
+}
+
+func (c *WaylandClipboard) Write(content string) error {
+	cmd := exec.Command("wl-copy")
+	cmd.Stdin = strings.NewReader(content)
+	return cmd.Run()
+}
+
+func (c *WaylandClipboard) Watch(ctx context.Context) <-chan string {
+	out := make(chan string)
+
+	go func() {
+		defer close(out)
+
+		// Use wl-paste --watch to detect clipboard changes
+		// When clipboard changes, it runs "echo x" which outputs a single line
+		// Then we read the full clipboard content separately
+		cmd := exec.CommandContext(ctx, "wl-paste", "--watch", "echo", "x")
+		stdout, err := cmd.StdoutPipe()
+		if err != nil {
+			return
+		}
+
+		if err := cmd.Start(); err != nil {
+			return
+		}
+
+		scanner := bufio.NewScanner(stdout)
+		for scanner.Scan() {
+			select {
+			case <-ctx.Done():
+				cmd.Process.Kill()
+				return
+			default:
+				// Clipboard changed, read full content
+				content, err := c.Read()
+				if err == nil && content != "" {
+					out <- content
+				}
+			}
+		}
+
+		cmd.Wait()
+	}()
+
+	return out
+}

internal/clipboard/x11.go

@@ -0,0 +1,51 @@
+package clipboard
+
+import (
+	"context"
+
+	"golang.design/x/clipboard"
+)
+
+type X11Clipboard struct{}
+
+func NewX11() (*X11Clipboard, error) {
+	if err := clipboard.Init(); err != nil {
+		return nil, err
+	}
+	return &X11Clipboard{}, nil
+}
+
+func (c *X11Clipboard) Read() (string, error) {
+	return string(clipboard.Read(clipboard.FmtText)), nil
+}
+
+func (c *X11Clipboard) Write(content string) error {
+	clipboard.Write(clipboard.FmtText, []byte(content))
+	return nil
+}
+
+func (c *X11Clipboard) Watch(ctx context.Context) <-chan string {
+	out := make(chan string)
+
+	go func() {
+		defer close(out)
+
+		// golang.design/x/clipboard provides a Watch function
+		ch := clipboard.Watch(ctx, clipboard.FmtText)
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case data, ok := <-ch:
+				if !ok {
+					return
+				}
+				if len(data) > 0 {
+					out <- string(data)
+				}
+			}
+		}
+	}()
+
+	return out
+}