/**
* {@inheritdoc}
*/
public function generate($uri, $alias = null)
{
$html = $this->htmlFetcher->fetch($uri);
$builder = new ProcessBuilder();
$builder->setPrefix($this->criticalBin);
$builder->setArguments(['--base=' . realpath(__DIR__ . '/../.tmp'), '--width=' . $this->width, '--height=' . $this->height, '--minify']);
foreach ($this->css as $css) {
$builder->add('--css=' . $css);
}
foreach ($this->ignore as $ignore) {
$builder->add('--ignore=' . $ignore);
}
$builder->setInput($html);
$process = $builder->getProcess();
$process->run();
if (!$process->isSuccessful()) {
throw new CssGeneratorException(sprintf('Error processing URI [%s]. This is probably caused by ' . 'the Critical npm package. Checklist: 1) `critical_bin`' . ' is correct, 2) `css` paths are correct 3) run `npm ' . 'install` again.', $uri));
}
return $this->storage->writeCss(is_null($alias) ? $uri : $alias, $process->getOutput());
}
/**
* Remove old critical-path CSS.
*
* @return void
*/
protected function removeOldCss()
{
$this->info('Removing old critical-path CSS.');
$this->storage->clearCss();
}