pathname-type

(pathname-type pathname)

The type (extension) component of a namestring, without its dot -- what follows the LAST dot of the file part -- or nil when there is none. A dot at position 0 does not separate a type, so a dotfile has a name and no type.

Takes a pathname or a namestring; the split is pure string work on the namestring -- nothing is read from the filesystem and a nonexistent path answers just the same. It is the other half of the split pathname-name takes, by the same rule.

(pathname-type "d/a") is NIL, (pathname-type "d/.a") is NIL, and (pathname-type "d/a.b.c") is "c". A type that is exactly * answers :WILD, the keyword make-pathname builds it from.

Backend support

All four backends -- one definition in rontolisp source over primitives every backend has.