feat: region exclusion

[Hanaasagi]

No description provided.

[Hanaasagi]

1. bug:

time=2025-08-03T14:28:28.110+08:00 level=INFO msg="Adding shell prompt exclusion" prompt="(eval):1: can't change option: zle\n(eval):1: can't change option: zle\n(py38
) \x1b[01;32m➜  \x1b[36mmagonote\x1b[00m" workingDir=/root/.tmux/plugins/magonote

2. Using a PTY to solve this is slow and fails to retrieve additional information, such as Git status.

func (m *Magonote) getShellPrompt(workingDir string) (string, error) {
	shellPath := os.Getenv("SHELL")
	if shellPath == "" {
		shellPath = "bash"
	} else {
		shellPath = filepath.Base(shellPath)
	}

	var cmd *exec.Cmd
	var promptCmd string

	switch shellPath {
	case "zsh":
		promptCmd = fmt.Sprintf(`cd "%s" && print -P "$PS1" && exit`, workingDir)
		cmd = exec.Command("zsh", "-i", "-c", promptCmd)
	default:
		promptCmd = fmt.Sprintf(`cd "%s" && echo "${PS1@P}" && exit`, workingDir)
		cmd = exec.Command("bash", "-i", "-c", promptCmd)
	}

	slog.Info("Running shell prompt command with PTY", "shell", shellPath, "workingDir", workingDir, "command", promptCmd)

	// Create PTY
	ptmx, err := pty.Start(cmd)
	if err != nil {
		slog.Warn("Failed to start shell with PTY", "error", err)
		return "", nil
	}
	defer ptmx.Close()

	// Read with timeout (in case the shell hangs)
	var buf bytes.Buffer
	done := make(chan struct{})
	go func() {
		_, _ = buf.ReadFrom(ptmx)
		close(done)
	}()

	select {
	case <-done:
	case <-time.After(500 * time.Millisecond):
		slog.Warn("Timeout while reading from shell PTY")
		return "", nil
	}

	// Parse and clean the prompt string
	output := strings.TrimSpace(buf.String())
	lines := strings.Split(output, "\n")
	prompt := ""
	for _, line := range lines {
		// heuristic: skip lines like `cd ...` or shell noise
		if !strings.HasPrefix(line, "cd ") && strings.TrimSpace(line) != "" {
			prompt = line
			break
		}
	}

	prompt = StripANSI(prompt)
	slog.Debug("Retrieved shell prompt (PTY)", "prompt", prompt, "shell", shellPath, "workingDir", workingDir)
	return prompt, nil
}