thermal, pull custom & acf fields

custom.php

<?php
function north_cast_api_data($content) {
  if (is_numeric($content)) $content = intval($content);
  else {
    $unserialized_content = @unserialize($content);
    // we got serialized content
    if ($unserialized_content !== false) {
      // make sure that integers are represented as such, instead of str
      foreach ($unserialized_content as $fn => &$c) {
        if (is_numeric($c)) $c = intval($c);
      }
      $content = $unserialized_content;
    }
  }
  return $content;
}

add_filter( 'thermal_post_entity', function($data, &$post, $state ) {
  if( $state === 'read' ){

    // get all of the post's metadata
    $custom_fields_raw = (object) get_post_meta($post->ID);

    // uncomment the following to include the raw data for testing
    //$data->meta->custom_fields_raw = $custom_fields_raw;

    // create an object for storing all the post data
    $sections = new StdClass;
    $custom_fields_additional = array();

    foreach ($custom_fields_raw as $fieldName => $content) {
      // remove any fields that start with an underscore, as it's a private one
      if (substr((string)$fieldName, 0, 1) == '_') continue;

      // if the string matches the format string_X_string, where X is any
      // integer then we need to put it into an object
      if (preg_match('_\d+_', (string)$fieldName, $indexes) > 0) {
        // we need a type of field, an index of that field, and an item
        $index = (int) $indexes[0];
        $keys = explode('_'.$index.'_', (string)$fieldName);
        $type = $keys[0];
        $item = $keys[1];

        // we need the type of this item, which is only stored in that type's
        // serialized content
        $type_ref = &$custom_fields_raw->$type;
        $type_info = unserialize($type_ref[0]);

        // now we need to create an array for that type
        if (!$sections->$type) $sections->$type = array();
        $object = &$sections->$type;

        // Initialize objects if not already created
        if ( !is_object($object[$index]) ) $object[$index] = new StdClass;
        if ( !is_object($object[$index]->data) ) $object[$index]->data = new StdClass;

        // add the object's type, if we have one.
        if ($type_info[$index]) $object[$index]->type = $type_info[$index];

        // check if we've got an integer or serialized data, and massage to the
        // right type accordingly
        $content = north_cast_api_data($content[0]);

        // now add the content to the data array
        $object[$index]->data->$item = $content;
      }
      // if we didn't match that format, this may be an additional custom field
      // that needs to be included.
      else {
        $custom_fields_additional[$fieldName] = north_cast_api_data($content[0]);
      }
    }

    $data->meta->sections = $sections;
    $data->meta->custom_fields = (object) $custom_fields_additional;
  }
  return $data;
}, 10, 3);

add_filter( 'thermal_post_entity', function( $data, &$post, $state ) {
  if ( $state === 'read' ) {
    $post_format = get_post_format( $post->ID );
    $data = (array)$data;
    $data['page_format'] = $post_format ? $post_format : 'standard';
  }
  return $data;
}, 100, 3);