title: Mac OSX command hg branch name autocomplete
body: <p>We have used the mercurial for our project. I am using hg via terminal for add, commit &amp; push the changes.</p>
  
  <p>While moving one branch to another branch i need autocomplete of branch names.</p>
  
  <p>hg update reg<code>&lt;tab&gt;</code></p>
  
  <p>It should display the branch name and auto complete that name.</p>
  
  <p><code>hg update registration</code></p>
  
  <p>Please suggest is any way to achieve this approach.</p>
  
  <p>Advance thanks !!</p>