Template Toolkit, problem with recursive wrapper templates

larsen has asked for the wisdom of the Perl Monks concerning the following question:

I have a problem with Template Toolkit, more specifically with the WRAPPER directive. I'm using ttree. In my ttreerc I defined a wrapper, let's call it "foo". Then, in one of the pages, I used a redirect() FILTER to produce several pages, each described in a data structure defined in the page. This is very similar to my actual code:

[% categories = [ ... ] %]
[% FOREACH c IN categories %]
    [% FILTER redirect( $c ) %]
        bla bla bla
    [% END %]
[% END %]
[download]

Now, I'd like each category page to use the same wrapper. My first attempt has been the following:

    ...
    [% FILTER redirect( $c ) %]
        [% WRAPPER foo %]
        bla bla bla
        [% END %]
    [% END %]
    ...
[download]

but it does not work, leading to ! file error - recursion into 'wrapper.tt2' in the build phase. Allowing recursion via ttree config leads just to deeper errors.
I think I'm facing a common problem, which I'm trying to solve using the wrong tecnique. What's your advice ? Thank you.

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Re: Template Toolkit, problem with recursive wrapper templates by Your Mother (Archbishop) on Jul 11, 2005 at 23:32 UTC
I hope this isn't a dumb answer but do you have the `'RECURSION'` flag on in your config? It's off by default.	[reply]
Re^2: Template Toolkit, problem with recursive wrapper templates by larsen (Parson) on Jul 12, 2005 at 07:29 UTC
Yes I tried, and it causes deep recursion error during the build phase. Actually, I haven't tried that option with every variation of code I was conjuring with.	[reply]
Re: Template Toolkit, problem with recursive wrapper templates by mugwumpjism (Hermit) on Jul 12, 2005 at 05:48 UTC
That's a real bummer. Especially since WRAPPER classes are by their nature likely to be used more than once in a single call stack. If I were you, I'd consider hacking the Template Toolkit modules themselves so that they don't do this check for WRAPPER directives, and sending a patch to the TT list for discussion. $h=$ENV{HOME};my@q=split/\n\n/,`cat $h/.quotes`;$s="$h/." ."signature";$t=`cat $s`;print$t,"\n",$q[rand($#q)],"\n"; [download]	[reply] [d/l]
Re: Template Toolkit, problem with recursive wrapper templates by larsen (Parson) on Jul 12, 2005 at 12:46 UTC
I think I figured out how to solve the problem. I changed `wrapper.tt2` this way (applying this advice): `[% IF template.naked; content; ELSE; content WRAPPER site_wrapper.tt2; END; %]` [download] Then, in my template: `[% META naked = 1 %] [% WRAPPER site_wrapper.tt2 %] + whatever [% END %] [% FOREACH c IN categories %] [% FILTER redirect("${c.name}/index.html") %] [% PROCESS portfolio/category %] [% END %] [% END %]` [download] `site_wrapper.tt2`, as you can guess, contains the code that was in `wrapper.tt2`. In `portfolio/category`: `[% WRAPPER site_wrapper.tt2 %] it works! [% END %]` [download] Now I have another problem: changing `META` informations in the processed template. But that's another issue.	[reply] [d/l] [select]
Re: Template Toolkit, problem with recursive wrapper templates by waswas-fng (Curate) on Jul 11, 2005 at 22:44 UTC
What does your Template->new look like? Do you Process => wrapper.tt2 or Wrapper => wrapper.tt2? -Waswas	[reply]
Re^2: Template Toolkit, problem with recursive wrapper templates by larsen (Parson) on Jul 12, 2005 at 07:13 UTC
I'm not using Template directly, but via `ttree`. It's `WRAPPER => 'wrapper.tt2'`, though, since I'm using `wrapper = wrapper.tt2` in the ttree config file.	[reply]
Re: Template Toolkit, problem with recursive wrapper templates by waswas-fng (Curate) on Jul 11, 2005 at 22:44 UTC
oops double post.. -Waswas	[reply]