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Plugins.pod
#============================================================= -*-perl-*- # # Template::Manual::Plugins # # AUTHOR # Andy Wardley <abw@wardley.org> # # COPYRIGHT # Copyright (C) 1996-2022 Andy Wardley. All Rights Reserved. # # This module is free software; you can redistribute it and/or # modify it under the same terms as Perl itself. # #======================================================================== =head1 NAME Template::Manual::Plugins - Standard plugins =head1 TEMPLATE TOOLKIT PLUGINS The following plugin modules are distributed with the Template Toolkit. Some of the plugins interface to external modules (detailed below) which should be downloaded from any CPAN site and installed before using the plugin. =head2 Assert New in 2.20! The L<Assert|Template::Plugin::Assert> plugin adds an C<assert> virtual method that you can use to catch undefined values. For example, consider this dotop: [% user.name %] If C<user.name> is an undefined value then TT will silently ignore the fact and print nothing. If you C<USE> the C<assert> plugin then you can add the C<assert> vmethod between the C<user> and C<name> elements, like so: [% user.assert.name %] Now, if C<user.name> is an undefined value, an exception will be thrown: assert error - undefined value for name =head2 CGI The L<CGI|Template::Plugin::CGI> plugin is a wrapper around Lincoln Stein's CGI.pm module. The plugin is distributed with the Template Toolkit (see L<Template::Plugin::CGI>) and the L<CGI> module itself is distributed with recent versions Perl, or is available from CPAN. [% USE CGI %] [% CGI.param('param_name') %] [% CGI.start_form %] [% CGI.popup_menu( Name => 'color', Values => [ 'Green', 'Brown' ] ) %] [% CGI.end_form %] =head2 Datafile Provides an interface to data stored in a plain text file in a simple delimited format. The first line in the file specifies field names which should be delimiter by any non-word character sequence. Subsequent lines define data using the same delimiter as in the first line. Blank lines and comments (lines starting '#') are ignored. See L<Template::Plugin::Datafile> for further details. /tmp/mydata: # define names for each field id : email : name : tel # here's the data fred : fred@here.com : Fred Smith : 555-1234 bill : bill@here.com : Bill White : 555-5678 example: [% USE userlist = datafile('/tmp/mydata') %] [% FOREACH user = userlist %] [% user.name %] ([% user.id %]) [% END %] =head2 Date The L<Date|Template::Plugin::Date> plugin provides an easy way to generate formatted time and date strings by delegating to the L<POSIX> C<strftime()> routine. See L<Template::Plugin::Date> and L<POSIX> for further details. [% USE date %] [% date.format %] # current time/date File last modified: [% date.format(template.modtime) %] =head2 Directory The L<Directory|Template::Plugin::Directory> plugin provides a simple interface to a directory and the files within it. See L<Template::Plugin::Directory> for further details. [% USE dir = Directory('/tmp') %] [% FOREACH file = dir.files %] # all the plain files in the directory [% END %] [% FOREACH file = dir.dirs %] # all the sub-directories [% END %] =head2 DBI The C<DBI> plugin is no longer distributed as part of the Template Toolkit (as of version 2.15). It is now available as a separate L<Template::DBI> distribution from CPAN. =head2 Dumper The L<Dumper|Template::Plugin::Dumper> plugin provides an interface to the Data::Dumper module. See L<Template::Plugin::Dumper> and L<Data::Dumper> for further details. [% USE dumper(indent=0, pad="<br>") %] [% dumper.dump(myvar, yourvar) %] =head2 File The L<File|Template::Plugin::File> plugin provides a general abstraction for files and can be used to fetch information about specific files within a filesystem. See L<Template::Plugin::File> for further details. [% USE File('/tmp/foo.html') %] [% File.name %] # foo.html [% File.dir %] # /tmp [% File.mtime %] # modification time =head2 Filter This module implements a base class plugin which can be subclassed to easily create your own modules that define and install new filters. package MyOrg::Template::Plugin::MyFilter; use Template::Plugin::Filter; use base qw( Template::Plugin::Filter ); sub filter { my ($self, $text) = @_; # ...mungify $text... return $text; } Example of use: # now load it... [% USE MyFilter %] # ...and use the returned object as a filter [% FILTER $MyFilter %] ... [% END %] See L<Template::Plugin::Filter> for further details. =head2 Format The L<Format|Template::Plugin::Format> plugin provides a simple way to format text according to a C<printf()>-like format. See L<Template::Plugin::Format> for further details. [% USE bold = format('<b>%s</b>') %] [% bold('Hello') %] =head2 GD The C<GD> plugins are no longer part of the core Template Toolkit distribution. They are now available from CPAN in a separate L<Template::GD> distribution. =head2 HTML The L<HTML|Template::Plugin::HTML> plugin is very basic, implementing a few useful methods for generating HTML. It is likely to be extended in the future or integrated with a larger project to generate HTML elements in a generic way. [% USE HTML %] [% HTML.escape("if (a < b && c > d) ..." %] [% HTML.attributes(border => 1, cellpadding => 2) %] [% HTML.element(table => { border => 1, cellpadding => 2 }) %] See L<Template::Plugin::HTML> for further details. =head2 Iterator The L<Iterator|Template::Plugin::Iterator> plugin provides a way to create a L<Template::Iterator> object to iterate over a data set. An iterator is created automatically by the C<FOREACH> directive and is aliased to the C<loop> variable. This plugin allows an iterator to be explicitly created with a given name, or the default plugin name, C<iterator>. See L<Template::Plugin::Iterator> for further details. [% USE iterator(list, args) %] [% FOREACH item = iterator %] [% '<ul>' IF iterator.first %] <li>[% item %] [% '</ul>' IF iterator.last %] [% END %] =head2 Pod This plugin provides an interface to the L<Pod::POM|Pod::POM> module which parses POD documents into an internal object model which can then be traversed and presented through the Template Toolkit. [% USE Pod(podfile) %] [% FOREACH head1 = Pod.head1; FOREACH head2 = head1/head2; ... END; END %] =head2 Scalar The Template Toolkit calls user-defined subroutines and object methods using Perl's array context by default. # TT2 calls object methods in array context by default [% object.method %] This plugin module provides a way for you to call subroutines and methods in scalar context. [% USE scalar %] # force it to use scalar context [% object.scalar.method %] # also works with subroutine references [% scalar.my_sub_ref %] =head2 String The L<String|Template::Plugin::String> plugin implements an object-oriented interface for manipulating strings. See L<Template::Plugin::String> for further details. [% USE String 'Hello' %] [% String.append(' World') %] [% msg = String.new('Another string') %] [% msg.replace('string', 'text') %] The string "[% msg %]" is [% msg.length %] characters long. =head2 Table The L<Table|Template::Plugin::Table> plugin allows you to format a list of data items into a virtual table by specifying a fixed number of rows or columns, with an optional overlap. See L<Template::Plugin::Table> for further details. [% USE table(list, rows=10, overlap=1) %] [% FOREACH item = table.col(3) %] [% item %] [% END %] =head2 URL The L<URL|Template::Plugin::URL> plugin provides a simple way of constructing URLs from a base part and a variable set of parameters. See L<Template::Plugin::URL> for further details. [% USE mycgi = url('/cgi-bin/bar.pl', debug=1) %] [% mycgi %] # ==> /cgi/bin/bar.pl?debug=1 [% mycgi(mode='submit') %] # ==> /cgi/bin/bar.pl?mode=submit&debug=1 =head2 Wrap The L<Wrap|Template::Plugin::Wrap> plugin uses the L<Text::Wrap> module to provide simple paragraph formatting. See L<Template::Plugin::Wrap> and L<Text::Wrap> for further details. [% USE wrap %] [% wrap(mytext, 40, '* ', ' ') %] # use wrap sub [% mytext FILTER wrap(40) -%] # or wrap FILTER The C<Text::Wrap> module is available from CPAN: http://www.cpan.org/modules/by-module/Text/ =head2 XML The C<XML::DOM>, C<XML::RSS>, C<XML::Simple> and C<XML::XPath> plugins are no longer distributed with the Template Toolkit as of version 2.15 They are now available in a separate L<Template::XML> distribution. =cut # Local Variables: # mode: perl # perl-indent-level: 4 # indent-tabs-mode: nil # End: # # vim: expandtab shiftwidth=4:
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