Drupal2WP_Toolkit/page-taxonomy.php

<?php

/**
 * Plugin Name: Page Categories Taxonomy
 */

function add_page_categories_taxonomy()
{
    register_taxonomy('page_category', ['page', 'post'], [
        'label' => 'Page Categories',
        'hierarchical' => true,
        'public' => true,
        'show_ui' => true,
        'show_in_rest' => true,
    ]);
}
add_action('init', 'add_page_categories_taxonomy');

// For WP-CLI (where 'init' may not trigger reliably)
if (defined('WP_CLI') && WP_CLI) {
    WP_CLI::add_hook('after_wp_load', function () {
        register_page_category_taxonomy();
    });
}

// Add a new column to the Pages list
add_filter('manage_page_posts_columns', 'add_page_category_column');
function add_page_category_column($columns)
{
    $new_columns = array();
    foreach ($columns as $key => $value) {
        $new_columns[$key] = $value;
        if ('author' === $key) {
            $new_columns['page_category'] = 'Categories';
        }
    }
    return $new_columns;
}


// Populate the custom column with taxonomy terms
add_action('manage_page_posts_custom_column', 'show_page_category_column', 10, 2);
function show_page_category_column($column, $post_id)
{
    if ('page_category' === $column) {
        $terms = get_the_terms($post_id, 'page_category');
        if (!empty($terms) && !is_wp_error($terms)) {
            $links = array();
            foreach ($terms as $term) {
                $url = admin_url('edit.php?post_type=page&page_category=' . $term->slug);
                $links[] = '<a href="' . esc_url($url) . '">' . esc_html($term->name) . '</a>';
            }
            echo implode(', ', $links);
        } else {
            echo '—';
        }
    }
}

// filter taxonomy
add_action('restrict_manage_posts', 'filter_page_by_top_level_category');
function filter_page_by_top_level_category()
{
    global $typenow;

    if ($typenow !== 'page') return;

    $taxonomy = 'page_category';
    $terms = get_terms([
        'taxonomy' => $taxonomy,
        'parent' => 0, // 👈 Only top-level categories
        'hide_empty' => false,
    ]);

    if (!empty($terms)) {
        echo '<select name="' . $taxonomy . '" style="max-width:160px">';
        echo '<option value="">Filter by Category</option>';
        foreach ($terms as $term) {
            $selected = isset($_GET[$taxonomy]) && $_GET[$taxonomy] === $term->slug ? ' selected="selected"' : '';
            echo '<option value="' . esc_attr($term->slug) . '"' . $selected . '>' . esc_html($term->name) . '</option>';
        }
        echo '</select>';
    }
}

add_filter('parse_query', 'apply_top_level_category_filter');
function apply_top_level_category_filter($query)
{
    global $pagenow;

    if (
        $pagenow === 'edit.php' &&
        $query->is_main_query() &&
        isset($_GET['page_category']) &&
        !empty($_GET['page_category']) &&
        $query->get('post_type') === 'page'
    ) {
        $taxonomy = 'page_category';
        $term_slug = sanitize_text_field($_GET['page_category']);

        // Get full term object by slug
        $term = get_term_by('slug', $term_slug, $taxonomy);

        if ($term && !is_wp_error($term)) {
            $query->set('tax_query', [[
                'taxonomy' => $taxonomy,
                'field'    => 'term_id',
                'terms'    => [$term->term_id],
                'include_children' => true, // 👈 Includes all subcategories too
                'operator' => 'IN'           // Matches pages with this term, even with others
            ]]);
        }
    }
}


// 1️⃣ Add the Last Modified column
add_filter('manage_page_posts_columns', function($columns) {
    $columns['modified_date'] = 'Last Modified';
    return $columns;
});

// 2️⃣ Display the modified time
add_action('manage_page_posts_custom_column', function($column, $post_id) {
    if ($column === 'modified_date') {
        echo get_post_modified_time('F j, Y g:i a', false, $post_id);
    }
}, 10, 2);

// 3️⃣ Make it sortable
add_filter('manage_edit-page_sortable_columns', function($columns) {
    $columns['modified_date'] = 'modified_date';
    return $columns;
});

// 4️⃣ Handle the sorting logic
add_action('pre_get_posts', function($query) {
    if (!is_admin() || !$query->is_main_query()) {
        return;
    }

    if ($query->get('orderby') === 'modified_date') {
        $query->set('orderby', 'modified');
    }
});

// Taxonomy based templates
add_action('admin_init', 'generate_page_category_templates');
    function generate_page_category_templates()
    {
        // Define plugin directory and template folder
        $plugin_dir = plugin_dir_path(__FILE__);
        $template_dir = $plugin_dir . 'templates/';

        if (!is_dir($template_dir)) {
            mkdir($template_dir); // Create if not exists
        }

        // Get all top-level terms
        $terms = get_terms([
            'taxonomy' => 'page_category',
            'parent' => 0,
            'hide_empty' => false,
        ]);

        foreach ($terms as $term) {
            $slug = $term->slug;
            $filename = "taxonomy-page_category-{$slug}.php";
            $filepath = $template_dir . $filename;

            if (!file_exists($filepath)) {
                // Create a basic scaffold file
                file_put_contents($filepath, "<?php\n// Template for '{$term->name}'\nget_header();\n?>
    <h1>Category: <?php echo esc_html('{$term->name}'); ?></h1>
    <?php if (have_posts()) : while (have_posts()) : the_post(); ?>
        <h2><a href=\"<?php the_permalink(); ?>\"><?php the_title(); ?></a></h2>
        <p><?php the_excerpt(); ?></p>
    <?php endwhile; endif; ?>
    <?php get_footer(); ?>
    ");
            }
        }
    }