XPost: comp.lang.scheme

Tim Bradshaw wrote:

If you want to write a function that returns the lines in the file do
this:

(defun read-lines-from-file (file)
;; Return a list of all the lines in FILE. FILE is either a string
or
;; a pathname
(with-open-file (in file :direction ':input)
;; no real line can be NIL, so we don't need to worry about
;; inventing a unique return value here
(loop for line = (read-line in nil nil)
while line collect line)))

...

Note for CLL people: I think this is a great use of LOOP. It's *so*
easy to see what is happening here:

loop for line = <get next line from file, NIL on EOF>
while line collect line

Of course it's not pure functional Lisp. But *so what*?

Gauche Scheme

(use gauche.generator)

(with-input-from-file "output.dat" (lambda()
(generator->list read-line)))


Another way:

(use file.util)

(file->list read-line "output.dat")


Another way:

(define (collect-file-lines file)
(with-input-from-file file (lambda()
(let go ()
(if (eof-object? (peek-char))
'()
(cons (read-line) (go)))))))

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)