From andy at onshored.com  Mon Oct  2 18:56:07 2006
From: andy at onshored.com (Andrew Golding)
Date: Mon, 02 Oct 2006 13:56:07 -0500
Subject: [html-template-devel] Additions to html-template
Message-ID: <1159815367.4091.47.camel@kfreedom.onshored.com>

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. <!-- TMPL_LOOP_FOR author authors -->).  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
<!-- TMPL_VAR (format nil "Displaying ~d results, displaying ~d through
~d." result-count first-result last-result) --> 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 at onshored.com


From edi at agharta.de  Wed Oct  4 10:18:42 2006
From: edi at agharta.de (Edi Weitz)
Date: Wed, 04 Oct 2006 12:18:42 +0200
Subject: [html-template-devel] Additions to html-template
In-Reply-To: <1159815367.4091.47.camel@kfreedom.onshored.com> (Andrew
	Golding's message of "Mon, 02 Oct 2006 13:56:07 -0500")
References: <1159815367.4091.47.camel@kfreedom.onshored.com>
Message-ID: <u64f0v0xp.fsf@agharta.de>

Hi!

On Mon, 02 Oct 2006 13:56:07 -0500, Andrew Golding <andy at onshored.com> wrote:

> 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 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.

I understand how this can be useful, but I wouldn't want to add it to
the HTML-TEMPLATE main code base, because I think it doesn't fit with
the original goal (borrowed from the Perl role model) of extreme
simplicity without mixing code and data.  Also, I'm always a bit
skeptical if EVAL is involved.

If you don't want to fork HTML-TEMPLATE, I can offer to add your code
to a "contrib" directoy within the HTML-TEMPLATE distribution to which
you can add the necessary documentation.  Would that be OK for you?

Cheers,
Edi.


From camdez at gmail.com  Sat Oct 21 16:56:31 2006
From: camdez at gmail.com (Cam Desautels)
Date: Sat, 21 Oct 2006 11:56:31 -0500
Subject: [html-template-devel] Escaping of HTML in Templates
Message-ID: <55738f5b0610210956r2608d149ub67c41ba7adc869e@mail.gmail.com>

Forgive me if I am missing something here, but given that
HTML-TEMPLATE is supposed to be agnostic to exactly what type of
content I am putting in a template, why is it escaping my HTML?  Is
this not a bug?  I'm running 0.7.0 on SBCL 0.9.16.

(html-template:fill-and-print-template
    "<p><!-- TMPL_VAR foo --></p>"
    '(:foo "This <em>is</em> HTML"))

--> <p>This &lt;em&gt;is&lt;/em&gt; HTML</p>

Thanks.
-- 
Cameron Desautels <camdez at gmail.com>


From toby at mi6.gen.nz  Sat Oct 21 19:12:08 2006
From: toby at mi6.gen.nz (Toby Allsopp)
Date: Sun, 22 Oct 2006 08:12:08 +1300
Subject: [html-template-devel] Re: Escaping of HTML in Templates
References: <55738f5b0610210956r2608d149ub67c41ba7adc869e@mail.gmail.com>
Message-ID: <87lkn9sctz.fsf@candyboy.here>

"Cam Desautels" <camdez at gmail.com> writes:

> Forgive me if I am missing something here, but given that
> HTML-TEMPLATE is supposed to be agnostic to exactly what type of
> content I am putting in a template, why is it escaping my HTML?  Is
> this not a bug?  I'm running 0.7.0 on SBCL 0.9.16.

http://weitz.de/html-template/#*string-modifier*