title: any R style guide / checker?
body: <p>in Python I'm used to having my code "style-checked" by an automatic but configurable tool, called <a href="http://pypi.python.org/pypi/pep8" rel="noreferrer">pep8</a>, after the <a href="http://www.python.org/dev/peps/pep-0008/" rel="noreferrer">8th Python enhancement proposal</a>.</p>
  
  <p>in R I don't know.  Google has a <a href="http://google-styleguide.googlecode.com/svn/trunk/google-r-style.html" rel="noreferrer">style guide</a>, but:</p>
  
  <ul>
  <li>what do most R programmers actually use?</li>
  <li>I still didn't find any program that performs those checks.</li>
  </ul>
  
  <hr>
  
  <p>Dirk, Alex, in your answers you pointed me at pretty printers, but in my opinion that would overdo one thing and not do another: code would be automatically edited to follow the style, while no warnings are issued for poorly chosen identifiers.</p>