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get-files.lisp | Make it higher order so, you can do more than list files.

As mfiano said on the Lisp Discord, it would be better to make the function higher-order.

(defun map-files (path function &key (test (constantly t)) (recursive-p t))
  "Map over all files located in the directory of `PATH`, applying `FUNCTION` to each file's path.
`TEST` is a function that takes a file path and decides if `FUNCTION` should be applied to it.
`RECURSIVE-P`, when non-NIL will descend into sub-directories of `PATH` recursively."
  (labels ((process-files (dir)
             (map nil
                  (lambda (x)
                    (when (funcall test x)
                      (funcall function x)))
                  (uiop/filesystem:directory-files dir))))
    (uiop/filesystem:collect-sub*directories
     (uiop/pathname:ensure-directory-pathname path) t recursive-p #'process-files)))

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