:defaults :ignore-types ¶Attempt to complete a file name to the longest unambiguous prefix.
If supplied, directory from :defaults is used as the “working
directory” when doing completion. :ignore-types is a list of
strings of the pathname types (a.k.a. extensions) that should be
disregarded as possible matches (binary file names, etc.)
&optional defaults ¶Return a list of pathnames for all the possible completions of pathname with respect to defaults.