Which template failed to load?

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

Let's say I have the following Template Tookit template:

  <html>
    <head><title>[% title %]</title></head>
    <body>[% INCLUDE "$site/$body" %]</body>
  </html>
[download]

If "$site/$body" is not found, I currently have a DEFAULT template set in the constructor:

  my $template = Template->new(
    {
      INCLUDE_PATH => $some_include_path,
      DEFAULT      => $some_default,
      PLUGIN_BASE  => 'Onsite::Template::Plugin',
      OUTPUT       => \$self->{_output}
    }
  );
[download]

The problem I have is that I want need to be automatically notified when a template fails to load (which is easy if I point the default template at a plugin), but I would like to know which template failed to load. In other words, with the above code, how would I pass the value of "$site/$body" to the $some_default template?

The only thing I've come up with is including the Data::Dumpered output of the Template object in the email, but that would be about as popular as meat-flavored ice cream.

And yes, this has already been posted to the Template mailing list :)

Cheers,
Ovid

Join the Perlmonks Setiathome Group or just click on the the link and check out our stats.

Comment on Which template failed to load? Select or Download Code

Replies are listed 'Best First'.
•Re: Which template failed to load? by merlyn (Sage) on Aug 13, 2002 at 04:31 UTC
Don't use DEFAULT. I use something like this on Stonehenge's template setup: `TRY; INSERT "stonehenge/insert/${template.class}/col${template.instance +}.pod" WRAPPER stonehenge/column_individual; CATCH file; "<!-- cannot find stonehenge/insert/${template.class}/col${templat +e.instance}.pod -->"; END;` [download] The TRY/CATCH lets me take an alternate path if something fails. And of course, I've got access to the very same variables in the alternate branch. -- Randal L. Schwartz, Perl hacker	[reply] [d/l]
Re: Which template failed to load? by adrianh (Chancellor) on Aug 24, 2002 at 14:59 UTC
One way of doing this would be to write a subclass of Template::Provider that records the location of the templates it fetches. For example: `package Recording::Provider; use base qw(Template::Provider); my $Template_name; sub last_template { $Template_name }; sub fetch { my $self = shift; return( $self->SUPER::fetch($Template_name = shift) ); };` [download] You can then add this as the last provider in the chain - and the only one that handles the default template. `my @config = ( INCLUDE_PATH => '/Users/adrianh/Desktop/template/', ); my $template = Template->new({ EVAL_PERL => 1, LOAD_TEMPLATES => [ Template::Provider->new(@config), Recording::Provider->new(@config, DEFAULT => 'default.t2'), ], }) or die "could not make template\n";` [download] Your default.t2 template can then do something like this to show what template failed to load: `[% PERL %] print Recording::Provider->last_template [% END %] failed to load` [download] That last bit should probably more elegently implemented as a plugin - but I leave that as an exercise for the reader :-)	[reply] [d/l] [select]
Re: Which template failed to load? by BUU (Prior) on Aug 13, 2002 at 01:29 UTC
the only way i can think of at the moment, Not being familiar with template toolkit, i can only offer what about passing it through a perl script? I.e. `template=template.pl?myTemplate` which could fetch the desired data, and check if it failed and so forth. The only other idea is to run some kind of periodic testing routine that calls a sucession of pages and parses the url to determine if it got the default..	[reply] [d/l]