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<?php
namespace Tapestry\Entities\Generators;
use Tapestry\Entities\File;
use Tapestry\Entities\Project;
use Tapestry\Entities\Permalink;
use Tapestry\Entities\Pagination;
class PaginationGenerator extends FileGenerator
{
/**
* @param Project $project
*
* @return \Tapestry\Entities\ProjectFileInterface|\Tapestry\Entities\ProjectFileInterface[]
*/
public function generate(Project $project)
{
$newFile = clone $this->file;
$newFile->setData([
'generator' => array_filter($this->file->getData('generator'), function ($value) {
return $value !== 'PaginationGenerator';
}),
]);
if (! $configuration = $this->file->getData('pagination')) {
return $newFile;
}
$defaultConfiguration = [
'perPage' => 5,
'skip' => 0,
];
$configuration = array_merge($defaultConfiguration, $configuration);
$paginationKey = $configuration['provider'].'_items';
if (! $paginationItems = $this->file->getData($paginationKey)) {
return $newFile;
}
$paginationItems = array_filter($paginationItems, function ($key) use ($project) {
return $project->has('files.'.$key);
}, ARRAY_FILTER_USE_KEY);
// Segment $paginationItems into n segments based upon perPage and create a clone of the file with that page's items
// also update the files permalink and uid (unless its the first page). Follow up by injecting an instance of Paginator
// which is loaded with previous/next links and how many total pages there are.
$totalPages = ceil(count($paginationItems) / $configuration['perPage']);
// If there are no pages because the pagination filter cleared out the array then return; otherwise this ends
// up with an infinite loop
if ($totalPages == 0) {
return $newFile;
}
$generatedFiles = [];
// Skip functionality for #147
// @link https://github.com/carbontwelve/tapestry/issues/147
if ($configuration['skip'] > 0) {
$paginationItems = array_slice($paginationItems, $configuration['skip'], null, true);
}
$currentPage = 0;
foreach (array_chunk($paginationItems, $configuration['perPage'], true) as $pageItems) {
$pageFile = clone $newFile;
$currentPage++;
$pageFile->setData(['pagination' => new Pagination($project, $pageItems, $totalPages, ($currentPage))]);
if ($currentPage > 1) {
$pageFile->setUid($pageFile->getUid().'_page_'.$currentPage);
$permalink = $pageFile->getPermalink();
$template = $permalink->getTemplate();
if (strpos($template, '.')) {
$parts = explode('.', $template);
$parts[0] .= '/{page}';
$template = implode('.', $parts);
} else {
$template .= '/{page}';
}
// If the page calling this generator is, itself an index then we need to strip {filename} from the $template
// because nobody expects page one to be /blog/index.html and page two to be blog/index/2/index.html
// as per issue #50
if ($this->file->getFilename() === 'index') {
$parts = array_filter(explode('/', $template), function ($value) {
return $value !== '{filename}';
});
$template = implode('/', $parts);
}
$pageFile->setPermalink(new Permalink($template));
}
array_push($generatedFiles, $pageFile);
unset($pageFile);
}
$totalGenerated = count($generatedFiles);
if ($totalGenerated > 1) {
/**
* @var int
* @var File $generatedFile
*/
foreach ($generatedFiles as $key => &$generatedFile) {
/*
* @var Pagination
* @var null|File $previous
* @var null|File $next
*/
$pagination = $generatedFile->getData('pagination');
$next = (isset($generatedFiles[($key + 1)])) ? $generatedFiles[($key + 1)] : null;
$previous = (isset($generatedFiles[($key - 1)])) ? $generatedFiles[($key - 1)] : null;
$pagination->setPreviousNext(
is_null($previous) ? null : $previous->getUid(),
is_null($next) ? null : $next->getUid()
);
$pagination->setPages($generatedFiles);
}
unset($generatedFile);
}
return $generatedFiles;
}
}