[gambit-list] read-line

Joel J. Adamson jadamson at partners.org
Thu Apr 24 12:24:02 EDT 2008


Marc Feeley <feeley at iro.umontreal.ca> writes:

> On 24-Apr-08, at 10:47 AM, Joel J. Adamson wrote:
>
>> How the heck do I use read-line in a program?

[...]

>> and I always just end up redefining read-line:
>>
>>> (define (read-this)
>>    (let ((input (read-char))
>>          (output ""))
>>      (if (char=? input #\newline) output
>>          (string-append (string input)
>>                         (read-this)))))
>>> (read-this)
>> ""
>>> (read-this)this is text, baby
>> "this is text, baby"
>>
>> I'm really not getting this; can someone please explain it to me?
>
> I don't understand the problem you are having!  Your read-this is
> behaving exactly like read-line !

Yeah, it's the same.  I was saying my frustration --- and this is
monumental because it's the only major frustration I've had in two years
of working with Scheme --- was that all I could come up with was a
re-implementation of read-line.

The problem is really that I want read-line to behave exactly like
(read) except for the form in which it accepts the input: wait for input
and accept that input as a string.  I could have the user input a line
in double-quotes and just use (read), but I would prefer the user not to
type the quote marks.  Am I being too picky...?  The other problem with
using a recursive reading-by-token procedure is that the user then has
to use ^D to end the line (I've reserved ^D to exit the program).

Joel

-- 
Joel J. Adamson
Biostatistician
Pediatric Psychopharmacology Research Unit
Massachusetts General Hospital
Boston, MA  02114
(617) 643-1432
(303) 880-3109
Public key: http://pgp.mit.edu
http://www.unc.edu/~adamsonj

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