paragraphs_overrides.module

<?php


/**
 * Implements hook_theme()
 *
 * Register a theme for each paragraph type
 *
 */
function paragraphs_overrides_theme($existing, $type, $theme, $path) {
	$theme_templates = [];
	$paragraph_types = paragraphs_overrides_get_paragraph_types();

	// Register custom Paragraph bundle templates
	foreach ($paragraph_types as $paragraph_type) {
		$theme_templates['paragraph__paragraphs_overrides__' . $paragraph_type] = [
			'base hook' => 'paragraph',
		];
	}

	// Register custom Paragraph bundle template fallback
	$theme_templates['paragraph__paragraphs_overrides'] = [
		'base hook' => 'paragraph',
	];

	// Register custom Paragraph field wrapper
	$theme_templates['field__paragraph__paragraphs_overrides__wrapper'] = [
		'base hook' => 'field',
	];

	// Register custom Paragraph field wrapper
	$theme_templates['field__paragraph__paragraphs_overrides__components_container'] = [
		'base hook' => 'field',
	];

	// Register custom Paragraph field wrapper
	$theme_templates['field__paragraph__paragraphs_overrides__lp_components_container'] = [
		'base hook' => 'field',
	];


	// Navigation theme
	$theme_templates['site_navigation_experience'] = [
		'variables' => [],
		'template' => 'site-navigation-experience',
	];


	return $theme_templates;
}

/**
 * Implements HOOK_theme_suggestions_HOOK_alter
 *
 * Field wrapper template override suggestion
 */
function paragraphs_overrides_theme_suggestions_field_alter(array &$suggestions, array $variables, $hook) {
	$field = $variables['element']['#field_name'];

	// Body field wrapper
	//	if ($field == 'field_basic_page_body') {
	//		$suggestions[] = 'field__paragraph__paragraphs_overrides__wrapper';
	//	}

	// Case study field override
	if ($field == 'field_components') {
		$suggestions[] = 'field__paragraph__paragraphs_overrides__components_container';
	}

	// Landing page field override
	if ($field == 'field_lp_components') {
		$suggestions[] = 'field__paragraph__paragraphs_overrides__lp_components_container';
	}
}


/**
 * Implements HOOK_theme_suggestions_HOOK_alter
 *
 * Paragraph type template suggestions
 *
 */
function paragraphs_overrides_theme_suggestions_paragraph_alter(&$suggestions, $variables) {
	$entity = $variables['elements']['#paragraph'];
	$type = $entity->getType();

	$suggestions[] = 'paragraph__paragraphs_overrides';
	$suggestions[] = 'paragraph__paragraphs_overrides__' . $type;
}


/**
 * Implements hook_theme_registry_alter()
 *
 * Register these (above) templates with Drupal
 *
 */
function paragraphs_overrides_theme_registry_alter(&$theme_registry) {
	$module_path = drupal_get_path('module', 'paragraphs_overrides');
	$template_objects = drupal_find_theme_templates($theme_registry, '.html.twig', $module_path);
	$paragraph_types = paragraphs_overrides_get_paragraph_types();

	// 1. Loop through the paragraph types
	// 2. Check if each paragraph exists in the `$template_objects` array
	// 3. If it doesn't exist, remove it from the registry so we don't get any errors
	// 4. If it does exist, set actual path to template
	foreach ($paragraph_types as $type) {
		$template = 'paragraph__paragraphs_overrides__' . $type;
		if (!isset($template_objects[$template])) {
			unset($theme_registry['paragraph__paragraphs_overrides__' . $type]);
		}
		else {
			$theme_registry['paragraph__paragraphs_overrides__' . $type]['path'] = $template_objects[$template]['path'];
		}
	}
}


/**
 * Helper function to get a list of paragraph types by machine name
 *
 * @return array
 */
function paragraphs_overrides_get_paragraph_types() {
	$paragraph_bundles = \Drupal::service('entity_type.bundle.info')
		->getBundleInfo('paragraph');
	return array_keys($paragraph_bundles);
}


/**
 * Implements hook_preprocess_HOOK().
 */
function paragraphs_overrides_preprocess_paragraph(&$variables) {
	$entity = $variables['elements']['#paragraph'];
	$type = $entity->getType();

	$function = $type . "__override";
	if (function_exists($function)) {
		$variables = $function($variables);
	}
}