custom filters and chaining

Dustin Frazier wrote:
> I have two questions regarding the use of filters.  I
use the Template 
> Toolkit via ttree rather than writing custom Perl code
that uses the 
> underlying modules.  First question: Is it possible to
define and use 
> custom filters via ttree?

No, not directly from ttree.  But you can define filters
using a plugin.

    package Template::Plugin::MyFilters;
    use base 'Template::Plugin';

    sub new {
      my ($class, $context) = _;
      $context->define_filter( name => sub { ... } );
    }

Then put a [% USE MyFilters %] directive at the top of a
PRE_PROCESS 
template.  The plugin will be loaded and the filters
defined.

> [% FILTER html_entity | wrap(95) |
indent("\t") %]

That doesn't work I'm afraid, and it's too hard to fix it
in the current 
parser.

It is planned for TT3, although '+' will be the delimiting
character (as 
  per PROCESS, INCLUDE etc which currently accept this form)

    [% FILTER html_entity + wrap(95) +
indent("\t") %]
       ...
    [% END %]


Cheers
A

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