> In Scheme we could go even further and leave out the user-supplied 'n'
> argument. The implementation could choose how many entries it returns at
> one time, according to whatever is most convenient for FFI and GC.

OK so a version of Chibi's directory-fold...

(directory-fold dir kons knil)

... that gets lists instead of individual names.

Get all files in the directory:

(directory-fold dir append '())

Filter them:

(import (srfi 1))
(directory-fold
     dir
     (lambda (new-names so-far)
       (append so-far (filter not-a-dotfile? new-names)))
     '())

Gather into a hash table:

(import (srfi 69))
(directory-fold
     dir
     (lambda (new-names ht)
       (for-each (lambda (name)
                   (hash-table-set! ht name (get-some-info dir name)))
                 new-names)
       ht)
     (make-hash-table))

Get only some files:

(directory-fold
     dir
     (lambda (new-names so-far)
       (if (>= (length so-far) 10)
           so-far
           (append so-far new-names)))
     '())

Only count the files:

(directory-fold
     dir
     (lambda (new-names count) (+ count (length new-names)))
     0)

What do you think?