title: How can I determine the source and/or contents of a .swp file?
body: <p>I have a <code>&gt;36 GB</code> file at <code>$HOME/.swp</code> on macOS. The file is over 2 years old, I'd like that space back, but I'm super curious as to what it could be.</p>
  <p>How can I figure out what app/process/program made it and whether it's trying to help me like save some state I've since thought lost?</p>