Make dashboard updateable

system_clipboard.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"os/exec"
+	"runtime"
+)
+
+type textClipboard interface {
+	ReadText() (string, error)
+	WriteText(string) error
+}
+
+type systemTextClipboard struct{}
+
+func (systemTextClipboard) ReadText() (string, error) {
+	command, args, err := clipboardCommand(false)
+	if err != nil {
+		return "", err
+	}
+	output, err := exec.Command(command, args...).Output()
+	if err != nil {
+		return "", fmt.Errorf("read system clipboard: %w", err)
+	}
+	return string(output), nil
+}
+
+func (systemTextClipboard) WriteText(value string) error {
+	command, args, err := clipboardCommand(true)
+	if err != nil {
+		return err
+	}
+	process := exec.Command(command, args...)
+	process.Stdin = bytes.NewBufferString(value)
+	if output, err := process.CombinedOutput(); err != nil {
+		if len(output) > 0 {
+			return fmt.Errorf("write system clipboard: %w: %s", err, bytes.TrimSpace(output))
+		}
+		return fmt.Errorf("write system clipboard: %w", err)
+	}
+	return nil
+}
+
+func clipboardCommand(write bool) (string, []string, error) {
+	switch runtime.GOOS {
+	case "darwin":
+		if write {
+			return "pbcopy", nil, nil
+		}
+		return "pbpaste", nil, nil
+	case "windows":
+		script := "Get-Clipboard -Raw"
+		if write {
+			script = "$input | Set-Clipboard"
+		}
+		return "powershell.exe", []string{"-NoProfile", "-NonInteractive", "-Command", script}, nil
+	default:
+		type candidate struct {
+			command string
+			write   []string
+			read    []string
+		}
+		candidates := []candidate{
+			{command: "wl-copy", read: []string{"-n"}, write: nil},
+			{command: "xclip", read: []string{"-selection", "clipboard", "-o"}, write: []string{"-selection", "clipboard", "-i"}},
+			{command: "xsel", read: []string{"--clipboard", "--output"}, write: []string{"--clipboard", "--input"}},
+		}
+		for _, candidate := range candidates {
+			command := candidate.command
+			args := candidate.read
+			if candidate.command == "wl-copy" && !write {
+				command = "wl-paste"
+			}
+			if write {
+				args = candidate.write
+			}
+			if _, err := exec.LookPath(command); err == nil {
+				return command, args, nil
+			}
+		}
+		return "", nil, fmt.Errorf("system clipboard unavailable: install wl-clipboard, xclip, or xsel")
+	}
+}