uiop:subpathname

(uiop:subpathname pathname subpath &key type)

Merges subpath under the DIRECTORY of pathname -- the portable way a library names a file relative to a base. An absolute pathname OBJECT passes through unchanged; anything else is parsed as a relative Unix namestring (given type, the whole last component becomes the NAME and type the type) and merged. An absolute STRING subpath is an error (:want-relative).

uiop:subpathname* is the same with a nil-tolerant base: nil answers nil, and a non-nil base is first put in directory form.

Backend support

Works on all four backends (Lisp source, uiop-pathname.lisp). Like uiop:merge-pathnames*, the compile paths fold a call over literal arguments to a pathname literal.