picea/docs/99-dependency-injection.md

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# Using Dependency Injection
Here's an excerpt from Lean's definition file 'template.php' which also loads Picea\Ui.
It also insert `Tell` inside the LanguageHandler which handles the `{% _ 'relative.lang.key' %}` and `{% lang 'my.full.lang.key' %}`.
```php
use function DI\autowire, DI\create, DI\get;
use Laminas\Diactoros\Response\HtmlResponse;
use Picea\{ Picea, Caching\Cache, Caching\Opcache, Compiler, Compiler\Context, Compiler\BaseContext, FileFetcher, Language\DefaultRegistrations, Method\Request };
use Picea\Extension\{ LanguageHandlerInterface, LanguageExtension, TitleExtension, NumberExtension, UrlExtension };
use Picea\Ui\{ Method, Ui };
return [
Picea::class => function($c) {
return new Picea($c->get(Context::class), $c->get(Cache::class), $c->get(Compiler::class), null, $c->get(FileFetcher::class), null, getenv("DEBUG"));
},
Context::class => function($c) {
return new BaseContext( $c->get(Lean\Lean::class)->getPiceaContext() );
},
Compiler::class => function($c) {
return new Compiler(new class(array_merge([
$c->get(LanguageExtension::class),
$c->get(TitleExtension::class),
$c->get(NumberExtension::class),
$c->get(UrlExtension::class),
$c->get(Method\Form::class),
$c->get(Method\Pagination::class),
$c->get(Request::class),
], class_exists(\Taxus\Picea\Extension::class) ? [ $c->get(\Taxus\Picea\Extension::class) ] : [],
array_map(fn($class) => $c->get($class), $c->get(Lean\Lean::class)->getPiceaExtensions() ))) extends DefaultRegistrations {
public function registerAll(Compiler $compiler) : void
{
parent::registerAll($compiler);
( new Ui() )->registerFormExtension($compiler);
}
});
},
Request::class => autowire(Request::class),
Method\Form::class => autowire(Method\Form::class),
Method\Pagination::class => autowire(Method\Pagination::class),
LanguageExtension::class => create(LanguageExtension::class)->constructor(get(LanguageHandlerInterface::class)),
LanguageHandlerInterface::class => function($c) {
return new class( $c->get(Tell\I18n::class) ) implements LanguageHandlerInterface {
public Tell\I18n $tell;
public function __construct(Tell\I18n $tell) {
$this->tell = $tell;
}
public function languageFromKey(string $key, array $variables = []) : array|string
{
return $this->tell->fromKey($key, $variables) ?: "";
}
};
},
TitleExtension::class => autowire(TitleExtension::class),
NumberExtension::class => autowire(NumberExtension::class),
UrlExtension::class => create(UrlExtension::class)->constructor(get(Context::class), getenv("URL_BASE"), get('git.commit')),
Cache::class => create(Opcache::class)->constructor(getenv("CACHE_PATH"), get(Context::class)),
FileFetcher::class => function($c) {
return new FileFetcher($c->get(Lean\Lean::class)->getViewPaths());
},
];
```