The porcelain format has a line per attribute. Attributes are listed with a
label and value separated by a single space. Boolean attributes (like 'bare'
and 'detached') are listed as a label only, and are only present if and only
-if the value is true. An empty line indicates the end of a worktree. For
-example:
+if the value is true. The first attribute of a worktree is always `worktree`,
+an empty line indicates the end of the record. For example:
------------
$ git worktree list --porcelain