implement clipboard using xclip to support openbsd

pkg/clipboard/clipboard_openbsd.go

@@ -0,0 +1,50 @@
+package clipboard
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+// writes usinng the xclip command, might also
+// work on freebsd and netbsd
+func writeAll(text string) error {
+	path, err := exec.LookPath("xclip")
+	if err != nil {
+		return fmt.Errorf("failed to find xclip: %w", err)
+	}
+
+	r, w, err := os.Pipe()
+	if err != nil {
+		return fmt.Errorf("failed to create xclip pipe: %w", err)
+	}
+	var perr error
+	go func() {
+		_, err := w.WriteString(text)
+		if err != nil {
+			perr = fmt.Errorf("failed to write to xclip: %w", err)
+		}
+		w.Close() // ignore err
+	}()
+
+	c := exec.Cmd{
+		Path: path,
+		Args: []string{
+			"-i",
+			"-selection",
+			"clipboard",
+		},
+		Stdin:  r,
+		Stdout: nil,
+		Stderr: nil,
+	}
+	err = c.Run()
+	if err != nil {
+		return fmt.Errorf("failed to run xclip: %w", err)
+	}
+	if perr != nil {
+		return fmt.Errorf("failed to write to xclip: %w", err)
+	}
+
+	return nil
+}