html-template-devel July 2004

html-template-devel@common-lisp.net

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2 discussions

[html-template-devel] [Jan Rychter] Re: question regarding HTML-TEMPLATE
by Edi Weitz 10 Jul '04

10 Jul '04

Here's Jan's answer (he replied to the list but forgot to subscribe) which explains why his code worked in the REPL but not in TBNL. Edi.

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[html-template-devel] Re: question regarding HTML-TEMPLATE
by Edi Weitz 10 Jul '04

10 Jul '04

Hi Jan! On Fri, 09 Jul 2004 23:57:42 -0700, Jan Rychter <jan(a)rychter.com> wrote: > First of all, I'd like to thank you for the excellent libraries that > you make available. I particularly appreciate how carefully finished > and documented they are. Thanks, you're welcome. > I would like to ask you a question regarding HTML-template -- > somehow I cannot get to work the way I would like to. I am puzzled > as to what I'm doing wrong: I have read and reread the > documentation, and tried a number of things. > > The problem I have is that my templates print on the standard output > (in the REPL) instead of being captured into strings. The absolutely > narrowed-down example is: > > (with-output-to-string (*standard-output*) > (with-input-from-string (s "test  one") > (html-template:fill-and-print-template s '(:a "1")))) > > This prints "test 1 one" in my REPL and returns an empty string. This happens because FILL-AND-PRINT-TEMPLATE rebinds *STANDARD-OUTPUT* to the value of *DEFAULT-TEMPLATE-OUTPUT* which is *STANDARD-OUTPUT* (the original one!) by default. I admit that this is an unfortunate design decision which happened mainly because I was too lazy to type. I might chance this in a future release. In other words: All statements like (write-string string) in CREATE-SIMPLE-PRINTER in 'template.lisp' should rather be (write-string string *default-template-output*) instead. That way I wouldn't need the (let ((*standard-output* stream)) rebinding in 'api.lisp'. > Adding a :stream *standard-output* argument to > fill-and-print-template helps in this case. However, it doesn't help > at all if I call this code from TBNL. In that case, everything still > ends up in the standard output of my REPL, instead of on the web > page. > > I'm sorry for bothering you with such a trivial problem. Perhaps you > could add a simple usage example together with TBNL to the > documentation of one of the packages? All of these should work: (with-output-to-string (*default-template-output*) (with-input-from-string (s "test  one") (html-template:fill-and-print-template s '(:a "1")))) (with-output-to-string (out) (with-input-from-string (s "test  one") (html-template:fill-and-print-template s '(:a "1") :stream out))) (with-output-to-string (out) (let ((*default-template-output* out)) (with-input-from-string (s "test  one") (html-template:fill-and-print-template s '(:a "1"))))) This is also documented here: <http://weitz.de/html-template/#default-template-output> Let me know if this works for you or if you still have problems. Cheers, Edi. PS: I'm sending a copy to the mailing list. Please use the list for bug reports and questions. Thanks.

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html-template-devel July 2004