html-template-devel April 2007

html-template-devel@common-lisp.net

1 participants
2 discussions

[html-template-devel] Additions to html-template
by Andrew Golding 22 Apr '08

22 Apr '08

Hello to all the members of this list. Recently at Onshore Development, we have started using HTML-TEMPLATE to render web-pages in an application we call Woofie, which provides an alternative interface to Webcheckout. While working on html templates for Woofie, I found myself wanting some extra abilities currently not available in HTML-TEMPLATE, mainly a foreach style loop with the variable which holds the current value of the list declared inside the tag, and the ability to use certain lisp expressions (format inside tmpl-var's and equality comparisons, boolean comparisons (or, and, etc.) inside of tmpl-if's). I would like to see if other developers would find such features useful. I currently have implemented both features I described to some degree in the following fashion: - the for-each style loop is represented in my templates as TMPL_LOOP_FOR and closed with a /TMPL_LOOP. The tag looks for two separate strings, one being the variable and the other being the list (eg. ). In the code, in each iteration of the loop over authors, a (setf (getf values :author) author) is performed (this should probably be changed into something similar to the *value-access-function*, or the perhaps *value-access-function* could be made setf'able?). - TMPL_IF and TMPL_VAR can take a symbol or a list. The list is deserialized from a string into a list of symbols or string literals delimited by double quotes. A larger expression is built by making a let, then evaluating the list. For example, the format expression in  would get expanded to: (let ((result-count (funcall *value-access-function* :result-count values)) (first-result (funcall *value-access-function* :first-result values)) (last-result (funcall *value-access-function* :last-result values))) (format nil "Displaying ~d results, displaying ~d through ~d." result-count first-result last-result)), which passed to (eval) and currently evaluated in the common lisp package (though evaluation should probably get done in some user-specified package that can be made to contain helper-functions for displaying data). I would appreciate any comments, and I will try to answer any questions should there be any (I'm guessing there will). The code can be found at http://kfreedom.onshored.com/html-template-additions.lisp , and should work with the standard html-template 0.7.0 package. Regards, Andrew Golding andy(a)onshored.com

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[html-template-devel] Re: HTML-TEMPLATE
by Edi Weitz 19 Apr '07

19 Apr '07

Hi Niek, On Thu, 19 Apr 2007 13:15:09 +0200, Niek <nieka(a)dsv.nl> wrote: [Please use the mailing list. See Cc.] > Looking at your HTML::Template port to Common Lisp, have you ever > considered porting http://template-toolkit.org/ ? No, that is definitely something I don't want to do. But there are similar things for Common Lisp AFAIK. Cheers, Edi.

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html-template-devel April 2007