lisp - capturing cl-fad:walk-directory output for finding files -

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i've wrestled hours i'm trying write find file function similar unix command. long , short of boils down not understanding why can't return proper value cl-fad:walk-directory function list (cl-fad here http://weitz.de/cl-fad/).

i'm trying this:

(cl-fad:walk-directory "/tmp/" #'(lambda (file) (format nil "~a" file))))

but '; no value' repl. below substituting 'format nil'...

(cl-fad:walk-directory "/tmp/" #'(lambda (file) (format t "~a" file)))

prints out files in /tmp/ directory (and below) stdout. haven't been able collect output list.

i've tried below no success.

(loop f in (cl-fad:walk-directory                  "/tmp/"                  #'(lambda (file) (format t "~a" file)))    collect (list f)))

the walk function doesn't collect return values mapcar, applies. you'll need save output somewhere, perhaps appending global list or stack.

(let (files)        (cl-fad:walk-directory "/tmp/" #'(lambda (x) (push (namestring x) files)))        files)

note namestring converts path objects filename.


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