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1 | package Catalyst::View::TT; |
2 | |
3 | use strict; |
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4 | use base qw/Catalyst::View/; |
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5 | use Data::Dump 'dump'; |
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6 | use Template; |
7 | use Template::Timer; |
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8 | use MRO::Compat; |
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9 | |
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10 | our $VERSION = '0.28'; |
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11 | |
12 | __PACKAGE__->mk_accessors('template'); |
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13 | __PACKAGE__->mk_accessors('include_path'); |
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14 | |
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15 | *paths = \&include_path; |
16 | |
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17 | =head1 NAME |
18 | |
19 | Catalyst::View::TT - Template View Class |
20 | |
21 | =head1 SYNOPSIS |
22 | |
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23 | # use the helper to create your View |
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24 | myapp_create.pl view TT TT |
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25 | |
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26 | # configure in lib/MyApp.pm (Could be set from configfile instead) |
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27 | |
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28 | MyApp->config( |
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29 | name => 'MyApp', |
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30 | root => MyApp->path_to('root'), |
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31 | 'View::TT' => { |
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32 | # any TT configurations items go here |
33 | INCLUDE_PATH => [ |
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34 | MyApp->path_to( 'root', 'src' ), |
35 | MyApp->path_to( 'root', 'lib' ), |
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36 | ], |
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37 | TEMPLATE_EXTENSION => '.tt', |
38 | CATALYST_VAR => 'c', |
39 | TIMER => 0, |
40 | # Not set by default |
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41 | PRE_PROCESS => 'config/main', |
42 | WRAPPER => 'site/wrapper', |
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43 | }, |
ae035767 |
44 | ); |
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45 | |
46 | # render view from lib/MyApp.pm or lib/MyApp::C::SomeController.pm |
47 | |
48 | sub message : Global { |
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49 | my ( $self, $c ) = @_; |
50 | $c->stash->{template} = 'message.tt2'; |
51 | $c->stash->{message} = 'Hello World!'; |
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52 | $c->forward('MyApp::V::TT'); |
53 | } |
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54 | |
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55 | # access variables from template |
56 | |
57 | The message is: [% message %]. |
58 | |
59 | # example when CATALYST_VAR is set to 'Catalyst' |
60 | Context is [% Catalyst %] |
61 | The base is [% Catalyst.req.base %] |
62 | The name is [% Catalyst.config.name %] |
63 | |
64 | # example when CATALYST_VAR isn't set |
65 | Context is [% c %] |
66 | The base is [% base %] |
67 | The name is [% name %] |
68 | |
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69 | =cut |
70 | |
71 | sub _coerce_paths { |
72 | my ( $paths, $dlim ) = shift; |
73 | return () if ( !$paths ); |
74 | return @{$paths} if ( ref $paths eq 'ARRAY' ); |
75 | |
76 | # tweak delim to ignore C:/ |
77 | unless ( defined $dlim ) { |
78 | $dlim = ( $^O eq 'MSWin32' ) ? ':(?!\\/)' : ':'; |
79 | } |
80 | return split( /$dlim/, $paths ); |
81 | } |
82 | |
83 | sub new { |
84 | my ( $class, $c, $arguments ) = @_; |
85 | my $config = { |
86 | EVAL_PERL => 0, |
87 | TEMPLATE_EXTENSION => '', |
88 | %{ $class->config }, |
89 | %{$arguments}, |
90 | }; |
91 | if ( ! (ref $config->{INCLUDE_PATH} eq 'ARRAY') ) { |
92 | my $delim = $config->{DELIMITER}; |
93 | my @include_path |
94 | = _coerce_paths( $config->{INCLUDE_PATH}, $delim ); |
95 | if ( !@include_path ) { |
96 | my $root = $c->config->{root}; |
97 | my $base = Path::Class::dir( $root, 'base' ); |
98 | @include_path = ( "$root", "$base" ); |
99 | } |
100 | $config->{INCLUDE_PATH} = \@include_path; |
101 | } |
102 | |
103 | # if we're debugging and/or the TIMER option is set, then we install |
104 | # Template::Timer as a custom CONTEXT object, but only if we haven't |
105 | # already got a custom CONTEXT defined |
106 | |
107 | if ( $config->{TIMER} ) { |
108 | if ( $config->{CONTEXT} ) { |
109 | $c->log->error( |
110 | 'Cannot use Template::Timer - a TT CONTEXT is already defined' |
111 | ); |
112 | } |
113 | else { |
114 | $config->{CONTEXT} = Template::Timer->new(%$config); |
115 | } |
116 | } |
117 | |
118 | if ( $c->debug && $config->{DUMP_CONFIG} ) { |
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119 | $c->log->debug( "TT Config: ", dump($config) ); |
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120 | } |
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121 | |
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122 | my $self = $class->next::method( |
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123 | $c, { %$config }, |
124 | ); |
125 | |
126 | # Set base include paths. Local'd in render if needed |
127 | $self->include_path($config->{INCLUDE_PATH}); |
128 | |
129 | $self->config($config); |
130 | |
131 | # Creation of template outside of call to new so that we can pass [ $self ] |
132 | # as INCLUDE_PATH config item, which then gets ->paths() called to get list |
133 | # of include paths to search for templates. |
134 | |
135 | # Use a weakend copy of self so we dont have loops preventing GC from working |
136 | my $copy = $self; |
137 | Scalar::Util::weaken($copy); |
138 | $config->{INCLUDE_PATH} = [ sub { $copy->paths } ]; |
139 | |
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140 | if ( $config->{PROVIDERS} ) { |
141 | my @providers = (); |
142 | if ( ref($config->{PROVIDERS}) eq 'ARRAY') { |
143 | foreach my $p (@{$config->{PROVIDERS}}) { |
144 | my $pname = $p->{name}; |
145 | my $prov = 'Template::Provider'; |
146 | if($pname eq '_file_') |
147 | { |
148 | $p->{args} = { %$config }; |
149 | } |
150 | else |
151 | { |
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152 | if($pname =~ s/^\+//) { |
153 | $prov = $pname; |
154 | } |
155 | else |
156 | { |
157 | $prov .= "::$pname"; |
158 | } |
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159 | # We copy the args people want from the config |
160 | # to the args |
161 | $p->{args} ||= {}; |
162 | if ($p->{copy_config}) { |
163 | map { $p->{args}->{$_} = $config->{$_} } |
164 | grep { exists $config->{$_} } |
165 | @{ $p->{copy_config} }; |
166 | } |
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167 | } |
168 | eval "require $prov"; |
169 | if(!$@) { |
170 | push @providers, "$prov"->new($p->{args}); |
171 | } |
172 | else |
173 | { |
174 | $c->log->warn("Can't load $prov, ($@)"); |
175 | } |
176 | } |
177 | } |
178 | delete $config->{PROVIDERS}; |
179 | if(@providers) { |
180 | $config->{LOAD_TEMPLATES} = \@providers; |
181 | } |
182 | } |
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183 | |
184 | $self->{template} = |
185 | Template->new($config) || do { |
186 | my $error = Template->error(); |
187 | $c->log->error($error); |
188 | $c->error($error); |
189 | return undef; |
190 | }; |
191 | |
192 | |
193 | return $self; |
194 | } |
195 | |
196 | sub process { |
197 | my ( $self, $c ) = @_; |
198 | |
199 | my $template = $c->stash->{template} |
200 | || $c->action . $self->config->{TEMPLATE_EXTENSION}; |
201 | |
202 | unless (defined $template) { |
203 | $c->log->debug('No template specified for rendering') if $c->debug; |
204 | return 0; |
205 | } |
206 | |
207 | my $output = $self->render($c, $template); |
208 | |
209 | if (UNIVERSAL::isa($output, 'Template::Exception')) { |
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210 | my $error = qq/Couldn't render template "$output"/; |
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211 | $c->log->error($error); |
212 | $c->error($error); |
213 | return 0; |
214 | } |
215 | |
216 | unless ( $c->response->content_type ) { |
217 | $c->response->content_type('text/html; charset=utf-8'); |
218 | } |
219 | |
220 | $c->response->body($output); |
221 | |
222 | return 1; |
223 | } |
224 | |
225 | sub render { |
226 | my ($self, $c, $template, $args) = @_; |
227 | |
228 | $c->log->debug(qq/Rendering template "$template"/) if $c->debug; |
229 | |
230 | my $output; |
231 | my $vars = { |
232 | (ref $args eq 'HASH' ? %$args : %{ $c->stash() }), |
233 | $self->template_vars($c) |
234 | }; |
235 | |
236 | local $self->{include_path} = |
237 | [ @{ $vars->{additional_template_paths} }, @{ $self->{include_path} } ] |
238 | if ref $vars->{additional_template_paths}; |
239 | |
240 | unless ($self->template->process( $template, $vars, \$output ) ) { |
241 | return $self->template->error; |
242 | } else { |
243 | return $output; |
244 | } |
245 | } |
246 | |
247 | sub template_vars { |
248 | my ( $self, $c ) = @_; |
249 | |
250 | my $cvar = $self->config->{CATALYST_VAR}; |
251 | |
252 | defined $cvar |
253 | ? ( $cvar => $c ) |
254 | : ( |
255 | c => $c, |
256 | base => $c->req->base, |
257 | name => $c->config->{name} |
258 | ) |
259 | } |
260 | |
261 | |
262 | 1; |
263 | |
264 | __END__ |
265 | |
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266 | =head1 DESCRIPTION |
267 | |
268 | This is the Catalyst view class for the L<Template Toolkit|Template>. |
269 | Your application should defined a view class which is a subclass of |
270 | this module. The easiest way to achieve this is using the |
271 | F<myapp_create.pl> script (where F<myapp> should be replaced with |
272 | whatever your application is called). This script is created as part |
273 | of the Catalyst setup. |
274 | |
275 | $ script/myapp_create.pl view TT TT |
276 | |
277 | This creates a MyApp::V::TT.pm module in the F<lib> directory (again, |
278 | replacing C<MyApp> with the name of your application) which looks |
279 | something like this: |
280 | |
281 | package FooBar::V::TT; |
282 | |
283 | use strict; |
284 | use base 'Catalyst::View::TT'; |
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285 | |
286 | __PACKAGE__->config->{DEBUG} = 'all'; |
287 | |
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288 | Now you can modify your action handlers in the main application and/or |
289 | controllers to forward to your view class. You might choose to do this |
290 | in the end() method, for example, to automatically forward all actions |
291 | to the TT view class. |
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292 | |
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293 | # In MyApp or MyApp::Controller::SomeController |
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294 | |
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295 | sub end : Private { |
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296 | my( $self, $c ) = @_; |
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297 | $c->forward('MyApp::V::TT'); |
298 | } |
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299 | |
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300 | =head2 CONFIGURATION |
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301 | |
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302 | There are a three different ways to configure your view class. The |
303 | first way is to call the C<config()> method in the view subclass. This |
304 | happens when the module is first loaded. |
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305 | |
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306 | package MyApp::V::TT; |
307 | |
308 | use strict; |
309 | use base 'Catalyst::View::TT'; |
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310 | |
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311 | MyApp::V::TT->config({ |
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312 | INCLUDE_PATH => [ |
313 | MyApp->path_to( 'root', 'templates', 'lib' ), |
314 | MyApp->path_to( 'root', 'templates', 'src' ), |
315 | ], |
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316 | PRE_PROCESS => 'config/main', |
317 | WRAPPER => 'site/wrapper', |
318 | }); |
319 | |
320 | The second way is to define a C<new()> method in your view subclass. |
321 | This performs the configuration when the view object is created, |
322 | shortly after being loaded. Remember to delegate to the base class |
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323 | C<new()> method (via C<$self-E<gt>next::method()> in the example below) after |
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324 | performing any configuration. |
325 | |
326 | sub new { |
327 | my $self = shift; |
328 | $self->config({ |
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329 | INCLUDE_PATH => [ |
330 | MyApp->path_to( 'root', 'templates', 'lib' ), |
331 | MyApp->path_to( 'root', 'templates', 'src' ), |
332 | ], |
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333 | PRE_PROCESS => 'config/main', |
334 | WRAPPER => 'site/wrapper', |
335 | }); |
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336 | return $self->next::method(@_); |
8cd017a8 |
337 | } |
338 | |
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339 | The final, and perhaps most direct way, is to define a class |
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340 | item in your main application configuration, again by calling the |
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341 | uniquitous C<config()> method. The items in the class hash are |
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342 | added to those already defined by the above two methods. This happens |
343 | in the base class new() method (which is one reason why you must |
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344 | remember to call it via C<MRO::Compat> if you redefine the C<new()> |
345 | method in a subclass). |
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346 | |
347 | package MyApp; |
348 | |
349 | use strict; |
350 | use Catalyst; |
351 | |
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352 | MyApp->config({ |
353 | name => 'MyApp', |
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354 | root => MyApp->path_to('root'), |
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355 | 'V::TT' => { |
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356 | INCLUDE_PATH => [ |
357 | MyApp->path_to( 'root', 'templates', 'lib' ), |
358 | MyApp->path_to( 'root', 'templates', 'src' ), |
359 | ], |
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360 | PRE_PROCESS => 'config/main', |
361 | WRAPPER => 'site/wrapper', |
362 | }, |
363 | }); |
364 | |
365 | Note that any configuration items defined by one of the earlier |
366 | methods will be overwritten by items of the same name provided by the |
367 | latter methods. |
368 | |
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369 | =head2 DYNAMIC INCLUDE_PATH |
370 | |
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371 | Sometimes it is desirable to modify INCLUDE_PATH for your templates at run time. |
372 | |
373 | Additional paths can be added to the start of INCLUDE_PATH via the stash as |
374 | follows: |
375 | |
376 | $c->stash->{additional_template_paths} = |
377 | [$c->config->{root} . '/test_include_path']; |
378 | |
379 | If you need to add paths to the end of INCLUDE_PATH, there is also an |
380 | include_path() accessor available: |
381 | |
382 | push( @{ $c->view('TT')->include_path }, qw/path/ ); |
383 | |
384 | Note that if you use include_path() to add extra paths to INCLUDE_PATH, you |
385 | MUST check for duplicate paths. Without such checking, the above code will add |
386 | "path" to INCLUDE_PATH at every request, causing a memory leak. |
387 | |
388 | A safer approach is to use include_path() to overwrite the array of paths |
389 | rather than adding to it. This eliminates both the need to perform duplicate |
390 | checking and the chance of a memory leak: |
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391 | |
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392 | @{ $c->view('TT')->include_path } = qw/path another_path/; |
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393 | |
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394 | If you are calling C<render> directly then you can specify dynamic paths by |
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395 | having a C<additional_template_paths> key with a value of additonal directories |
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396 | to search. See L<CAPTURING TEMPLATE OUTPUT> for an example showing this. |
397 | |
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398 | =head2 RENDERING VIEWS |
399 | |
400 | The view plugin renders the template specified in the C<template> |
401 | item in the stash. |
402 | |
403 | sub message : Global { |
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404 | my ( $self, $c ) = @_; |
405 | $c->stash->{template} = 'message.tt2'; |
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406 | $c->forward('MyApp::V::TT'); |
407 | } |
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408 | |
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409 | If a stash item isn't defined, then it instead uses the |
410 | stringification of the action dispatched to (as defined by $c->action) |
411 | in the above example, this would be C<message>, but because the default |
412 | is to append '.tt', it would load C<root/message.tt>. |
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413 | |
414 | The items defined in the stash are passed to the Template Toolkit for |
415 | use as template variables. |
416 | |
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417 | sub default : Private { |
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418 | my ( $self, $c ) = @_; |
419 | $c->stash->{template} = 'message.tt2'; |
420 | $c->stash->{message} = 'Hello World!'; |
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421 | $c->forward('MyApp::V::TT'); |
422 | } |
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423 | |
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424 | A number of other template variables are also added: |
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425 | |
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426 | c A reference to the context object, $c |
427 | base The URL base, from $c->req->base() |
428 | name The application name, from $c->config->{ name } |
429 | |
430 | These can be accessed from the template in the usual way: |
431 | |
432 | <message.tt2>: |
433 | |
434 | The message is: [% message %] |
435 | The base is [% base %] |
436 | The name is [% name %] |
437 | |
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438 | |
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439 | The output generated by the template is stored in C<< $c->response->body >>. |
440 | |
441 | =head2 CAPTURING TEMPLATE OUTPUT |
442 | |
443 | If you wish to use the output of a template for some other purpose than |
444 | displaying in the response, e.g. for sending an email, this is possible using |
445 | L<Catalyst::Plugin::Email> and the L<render> method: |
446 | |
447 | sub send_email : Local { |
448 | my ($self, $c) = @_; |
449 | |
450 | $c->email( |
451 | header => [ |
452 | To => 'me@localhost', |
453 | Subject => 'A TT Email', |
454 | ], |
455 | body => $c->view('TT')->render($c, 'email.tt', { |
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456 | additional_template_paths => [ $c->config->{root} . '/email_templates'], |
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457 | email_tmpl_param1 => 'foo' |
458 | } |
459 | ), |
460 | ); |
461 | # Redirect or display a message |
462 | } |
8cd017a8 |
463 | |
464 | =head2 TEMPLATE PROFILING |
465 | |
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466 | See L<C<TIMER>> property of the L<config> method. |
467 | |
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468 | =head2 METHODS |
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469 | |
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470 | =head2 new |
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471 | |
472 | The constructor for the TT view. Sets up the template provider, |
473 | and reads the application config. |
474 | |
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475 | =head2 process |
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476 | |
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477 | Renders the template specified in C<< $c->stash->{template} >> or |
478 | C<< $c->action >> (the private name of the matched action. Calls L<render> to |
479 | perform actual rendering. Output is stored in C<< $c->response->body >>. |
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480 | |
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481 | =head2 render($c, $template, \%args) |
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482 | |
483 | Renders the given template and returns output, or a L<Template::Exception> |
484 | object upon error. |
485 | |
486 | The template variables are set to C<%$args> if $args is a hashref, or |
487 | $C<< $c->stash >> otherwise. In either case the variables are augmented with |
488 | C<base> set to C< << $c->req->base >>, C<c> to C<$c> and C<name> to |
489 | C<< $c->config->{name} >>. Alternately, the C<CATALYST_VAR> configuration item |
490 | can be defined to specify the name of a template variable through which the |
491 | context reference (C<$c>) can be accessed. In this case, the C<c>, C<base> and |
492 | C<name> variables are omitted. |
493 | |
494 | C<$template> can be anything that Template::process understands how to |
495 | process, including the name of a template file or a reference to a test string. |
496 | See L<Template::process|Template/process> for a full list of supported formats. |
497 | |
b63ddd04 |
498 | =head2 template_vars |
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499 | |
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500 | Returns a list of keys/values to be used as the catalyst variables in the |
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501 | template. |
502 | |
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503 | =head2 config |
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504 | |
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505 | This method allows your view subclass to pass additional settings to |
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506 | the TT configuration hash, or to set the options as below: |
507 | |
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508 | =head2 paths |
509 | |
510 | The list of paths TT will look for templates in. |
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511 | |
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512 | =head2 C<CATALYST_VAR> |
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513 | |
514 | Allows you to change the name of the Catalyst context object. If set, it will also |
515 | remove the base and name aliases, so you will have access them through <context>. |
516 | |
517 | For example: |
518 | |
519 | MyApp->config({ |
520 | name => 'MyApp', |
7d8aa5ec |
521 | root => MyApp->path_to('root'), |
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522 | 'V::TT' => { |
523 | CATALYST_VAR => 'Catalyst', |
524 | }, |
525 | }); |
526 | |
527 | F<message.tt2>: |
528 | |
529 | The base is [% Catalyst.req.base %] |
530 | The name is [% Catalyst.config.name %] |
531 | |
b63ddd04 |
532 | =head2 C<TIMER> |
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533 | |
534 | If you have configured Catalyst for debug output, and turned on the TIMER setting, |
535 | C<Catalyst::View::TT> will enable profiling of template processing |
536 | (using L<Template::Timer>). This will embed HTML comments in the |
537 | output from your templates, such as: |
538 | |
539 | <!-- TIMER START: process mainmenu/mainmenu.ttml --> |
540 | <!-- TIMER START: include mainmenu/cssindex.tt --> |
541 | <!-- TIMER START: process mainmenu/cssindex.tt --> |
542 | <!-- TIMER END: process mainmenu/cssindex.tt (0.017279 seconds) --> |
543 | <!-- TIMER END: include mainmenu/cssindex.tt (0.017401 seconds) --> |
544 | |
545 | .... |
546 | |
547 | <!-- TIMER END: process mainmenu/footer.tt (0.003016 seconds) --> |
548 | |
549 | |
b63ddd04 |
550 | =head2 C<TEMPLATE_EXTENSION> |
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551 | |
747f2b6d |
552 | a sufix to add when looking for templates bases on the C<match> method in L<Catalyst::Request>. |
4729c102 |
553 | |
554 | For example: |
555 | |
556 | package MyApp::C::Test; |
557 | sub test : Local { .. } |
558 | |
559 | Would by default look for a template in <root>/test/test. If you set TEMPLATE_EXTENSION to '.tt', it will look for |
560 | <root>/test/test.tt. |
561 | |
51199593 |
562 | =head2 C<PROVIDERS> |
563 | |
564 | Allows you to specify the template providers that TT will use. |
565 | |
566 | MyApp->config({ |
567 | name => 'MyApp', |
568 | root => MyApp->path_to('root'), |
569 | 'V::TT' => { |
570 | PROVIDERS => [ |
571 | { |
572 | name => 'DBI', |
573 | args => { |
574 | DBI_DSN => 'dbi:DB2:books', |
575 | DBI_USER=> 'foo' |
576 | } |
577 | }, { |
578 | name => '_file_', |
579 | args => {} |
580 | } |
581 | ] |
582 | }, |
583 | }); |
584 | |
585 | The 'name' key should correspond to the class name of the provider you |
586 | want to use. The _file_ name is a special case that represents the default |
587 | TT file-based provider. By default the name is will be prefixed with |
588 | 'Template::Provider::'. You can fully qualify the name by using a unary |
589 | plus: |
590 | |
591 | name => '+MyApp::Provider::Foo' |
592 | |
6175bba7 |
593 | You can also specify the 'copy_config' key as an arrayref, to copy those keys |
594 | from the general config, into the config for the provider: |
595 | |
596 | DEFAULT_ENCODING => 'utf-8', |
597 | PROVIDERS => [ |
598 | { |
599 | name => 'Encoding', |
600 | copy_config => [qw(DEFAULT_ENCODING INCLUDE_PATH)] |
601 | } |
602 | ] |
603 | |
604 | This can prove useful when you want to use the additional_template_paths hack |
605 | in your own provider, or if you need to use Template::Provider::Encoding |
606 | |
8cd017a8 |
607 | =head2 HELPERS |
608 | |
609 | The L<Catalyst::Helper::View::TT> and |
610 | L<Catalyst::Helper::View::TTSite> helper modules are provided to create |
611 | your view module. There are invoked by the F<myapp_create.pl> script: |
612 | |
613 | $ script/myapp_create.pl view TT TT |
614 | |
615 | $ script/myapp_create.pl view TT TTSite |
616 | |
617 | The L<Catalyst::Helper::View::TT> module creates a basic TT view |
618 | module. The L<Catalyst::Helper::View::TTSite> module goes a little |
619 | further. It also creates a default set of templates to get you |
620 | started. It also configures the view module to locate the templates |
621 | automatically. |
622 | |
8077080c |
623 | =head1 SEE ALSO |
624 | |
8cd017a8 |
625 | L<Catalyst>, L<Catalyst::Helper::View::TT>, |
626 | L<Catalyst::Helper::View::TTSite>, L<Template::Manual> |
8077080c |
627 | |
c0eb0527 |
628 | =head1 AUTHORS |
8077080c |
629 | |
630 | Sebastian Riedel, C<sri@cpan.org> |
c0eb0527 |
631 | |
d938377b |
632 | Marcus Ramberg, C<mramberg@cpan.org> |
c0eb0527 |
633 | |
722fede4 |
634 | Jesse Sheidlower, C<jester@panix.com> |
c0eb0527 |
635 | |
8cd017a8 |
636 | Andy Wardley, C<abw@cpan.org> |
8077080c |
637 | |
638 | =head1 COPYRIGHT |
639 | |
2774dc77 |
640 | This program is free software, you can redistribute it and/or modify it |
641 | under the same terms as Perl itself. |
8077080c |
642 | |
643 | =cut |