On Feb 9, 2:10 pm, Thorsen Eric <ethor...@enclojure.org> wrote:
> For some reason I could not reply to the original thread...
>
> Begin forwarded message:
>
> > From: "Stephen C. Gilardi" <squee...@mac.com>
> > Date: February 6, 2009 12:49:34 PM EST
> > To: Eric Thorsen <ethor...@enclojure.org>
> > Subject: Re: Patch: universal main() with repl/script/compile
>
> > Hi Eric,
>
> >> I've been using the repl in clojure,main (which is great, BTW) but I
>
> > Thanks!
>
> >> have a question as to why the main loop is not a "pure" REPL?
> >> I am able to substitute all parts except that the *in* stream is
> >> mucked with in the loop with the skip-whitepace and skip-if-eol which
> >> means if I do not want that stuff to happen, I am out of luck. Can
> >> you shed some light on the problem you were trying to solve there and
> >> whether or not that logic can be moved into the default read function
> >> instead of being inside the loop?
>
> > Regarding skip-whitespace:
>
> > Good questions. clojure.core/read already does skip-whitespace
> > internally so you won't be avoiding that as long as you use it. The
> > downside of clojure.core/read doing that (rather than something I
> > control in the repl) is that clojure.core/read doesn't return at end-
> > of-line. One goal of making a nicer repl was to prompt for each
> > line: if the user types a blank line, give another prompt. That
> > isn't possible if I leave the current clojure.core/read in charge of
> > skipping whitespace. It considers the end-of-line as just more
> > whitespace and continues skipping.
>
> > Another goal was not to prompt again if there's more input on the
> > same line. Arguably, printing only the last value on the line would
> > also be correct (making each line (at least logically) a "do"), but
> > I found the following old behavior kind of annoying/confusing/
> > unsightly:
>
> > user=> 1 2 3
> > 1
> > user=> 2
> > user=> 3
> > user=>
>
> > Regarding skip-if-eol:
>
> > The call to skip-if-eol is to support (read-line) (and other input
> > stream reads) from the repl. In many cases, command interpreters
> > (like unix shells) consume the eol that terminates a line so that
> > other code can read from the input stream "cleanly". If I don't do
> > skip-if-eol, the response from (read-line), for example, will always
> > be blank (when typed on a line by itself) because the eol will still
> > be on the input stream.
>
> > I'll look at working these operations into a repl-read function so
> > they can be overridden/elided. It looks now like that that function
> > will probably need an end-of-stream argument and an end-of-line
> > argument passed in as sentinel values to return on those occasions.
> > (see clojure.main/eof).
>
> > Thanks for the feedback. I'll look at this tonight or over the
> > weekend. If you have any further ideas or suggestions, I'll be happy
> > to hear them and to answer any questions.
Issue + patch welcome.
Thanks,
Rich
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