bloody icons

wundetheme.theme.php

<?php

function wundertheme_page_attachments_alter(&$attachments) {
  // Prep various shortcut icons.
  $icons = [
    'android' => [
      'properties' => [
        'rel' => 'icon',
        'type' => 'image/png',
      ],
      'sizes' => [
        '192x192',
        '144x144',
        '96x96',
        '72x72',
        '48x48',
        '36x36',
      ]
    ],
    'apple'   => [
      'properties' => [
        'rel' => 'apple-touch-icon',
      ],
      'sizes' => [
        '180x180',
        '152x152',
        '144x144',
        '120x120',
        '114x114',
        '76x76',
        '72x72',
        '60x60',
        '57x57',
      ],
    ],
    'none'    => [
      'properties' => [
        'rel' => 'icon',
        'type' => 'image/png',
      ],
      'sizes' => [
        '96x96',
        '32x32',
        '16x16',
      ]
    ],
    'ms'      => [
      'properties' => [
        'name' => 'msapplication-TileImage',
        'rel' => 'icon',
        'href' => '', // Empty href so Drupal's processor wouldn't freak out.
      ],
      'sizes' => [
        '310x310',
        '150x150',
        '144x144',
        '70x70',
      ],
    ],
  ];
  $path = base_path() . drupal_get_path('theme', 'wundertheme');

  if (isset($attachments['#attached']) && isset($attachments['#attached']['html_head_link'])) {
    foreach ($icons as $provider => $iconset) {
      // Default attribute type.
      $href = 'href';
      // Prep provider token.
      $prov = $provider . '-';
      // Exception for Microsoft icons.
      if ($provider === 'ms') {
        $href = 'content';
      }
      // Exception for regular icons, reset provider token.
      else if ($provider === 'none') {
        $prov = '';
      }
      // Loop over sizes and prep data array.
      foreach ($iconset['sizes'] as $size) {
        $data = [];
        // Loop over properties and stuff them in data array.
        foreach ($iconset['properties'] as $propKey => $propValue) {
          $data[$propKey] = $propValue;
        }
        // Put the size in there.
        $data['sizes'] = $size;
        // The actual link to the icon.
        $data[$href] = $path . '/' . $prov . 'icon-' . $size . '.png';
        // Add it to the head.
        $attachments['#attached']['html_head_link'][] = [$data, TRUE];
      }
    }
    // Add manifest file.
    $attachments['#attached']['html_head_link'][] = [[ 'rel' => 'manifest', 'href' => $path . '/manifest.json' ], TRUE];
  }
}