Re: Unable to read a list with 'with-open-file'

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)))))))