feat: add seed phrase to backup-keys

[bashbunni]

Changes:

• add melt seed phrase output for backups
• make melt seed phrase look 🐰 cute 🌈 (UI changes)
  

Related Issues:

#116

[bashbunni]

I copied a lot of code over from melt 😂 let me know if there's a nicer way I could organize things or if it's okay

[caarlos0]

I copied a lot of code over from melt 😂 let me know if there's a nicer way I could organize things or if it's okay

I noticed hehe

I was thinking we can refactor there a bit to make it easier to use these parts as a lib too... will take a look there and ping you once its done :)

[moisesvega]

Suggested change

	pwderr := &ssh.PassphraseMissingError{}
	if errors.As(err, &pwderr) {
	pass, err := askKeyPassphrase(path)
	if err != nil {
	return "", err
	}
	return backup(path, pass)
	}
	return "", fmt.Errorf("could not parse key: %w", err)
	if !errors.Is(err, &ssh.PassphraseMissingError{}) {
	return "", fmt.Errorf("could not parse key: %w", err)
	}
	pass, err := askKeyPassphrase(path)
	if err != nil {
	return "", err
	}
	return backup(path, pass)

We can use errors.Is as we are not using pwderr for anything else.

By reversing the conditional here, we can reduce nesting, optionally we can encapsulate the logic in a new method askPassphraseAndBackup(path)

[moisesvega]

Suggested change

	return nil, fmt.Errorf("could not open tty")
	return nil, errors.New("could not open tty")

This will save some allocations.

[caarlos0]

its actually missing the parent err:

Suggested change

	return nil, fmt.Errorf("could not open tty")
	return nil, fmt.Errorf("could not open tty: %w", err)

[caarlos0]

alternative idea to this: an option to print the key to stdout, so users can pipe into melt (or something else) 🤔