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I'm using Lee Mac's great DirectoryFiles routine (copied below) to get a list of files in a given root directory. I'd like to stop the recursion prematurely and return nil if there are over 100 files in the list, but the recursion, mapcars, and lambdas are a bit above my head. Any help would be appreciated! ;; Directory Files - Lee Mac ;; Retrieves all files of a specified filetype residing in a directory (and subdirectories) ;; dir - [str] Root directory for which to return filenames ;; typ - [str] Optional filetype filter (DOS pattern) ;; sub - [bol] If T, subdirectories of the root directory are included ;; Returns: [lst] List of files matching the filetype criteria, else nil if none are found (defun LM:directoryfiles ( dir typ sub ) (setq dir (vl-string-right-trim "\\" (vl-string-translate "/" "\\" dir))) (append (mapcar '(lambda ( x ) (strcat dir "\\" x)) (vl-directory-files dir typ 1)) (if sub (apply 'append (mapcar '(lambda ( x ) (if (not (wcmatch x "`.,`.`.")) (LM:directoryfiles (strcat dir "\\" x) typ sub) ) ) (vl-directory-files dir nil -1) ) ) ) ) )