title: ZSH vcs_info: How to indicate if there are untracked files in Git
body: <p>In my zsh configuration, I have the following settings for <code>vcs_info</code>:</p>
  
  <pre><code>zstyle ':vcs_info:*' enable git
  zstyle ':vcs_info:*' check-for-changes true
  zstyle ':vcs_info:*' unstagedstr '!'
  zstyle ':vcs_info:*' stagedstr '+'
  zstyle ':vcs_info:*' formats "%u%c"
  </code></pre>
  
  <p>Using these settings, when I am in a git repository that contains unstaged changes, a <code>!</code> will be displayed in the prompt. When there are staged changes, a <code>+</code> will be displayed in the prompt.</p>
  
  <p>This is all good, but how do I make zsh indicate, for example <code>?</code>, when there are untracked files in the repository?</p>
  
  <p>I could not find a built-in setting for this in the zsh manual. Is there a way to get an indication if there are untracked files in a Git repository?</p>