Here's the first cut SRFI documentation I've created for make-directory-files-generator:
(make-directory-files-generator dir [dotfiles?]) → generator (procedure)
Return a SRFI 158 generator of the file names in directory dir. The dotfiles? flag (default
#f) causes dot files to be included in the list. Regardless of the value of dotfiles?, the two files
.. are never returned.
directory-files above, the directory dir is not prepended to each file name in the results the generator returns.
The generator approach is particularly useful when the number of items in a directory might be "huge", which has been a common paradigm when using a file system as a document database.