auto_post_titles.php

<?php

use Podlove\Model\Episode;
use Podlove\Model\Podcast;

add_filter('the_title', 'podlove_maybe_override_post_titles', 10, 2);
add_filter('podlove_get_episode_title', 'podlove_maybe_override_post_titles', 10, 2);
add_filter('podlove_get_episode_title_rss', 'podlove_maybe_override_rss_post_titles', 10, 2);
add_action('admin_print_scripts', 'podlove_override_post_title_script');

function podlove_maybe_override_post_titles($original_title, $post_id = null)
{
    if (is_null($post_id)) {
        $post_id = get_the_ID();
    }

    if (get_post_type($post_id) !== 'podcast') {
        return $original_title;
    }

    if (!podlove_is_title_autogen_enabled()) {
        return $original_title;
    }

    $episode_title = podlove_generated_post_title($post_id);

    if ($episode_title) {
        return $episode_title;
    }

    return $original_title;
}

function podlove_maybe_override_rss_post_titles($original_title)
{
    $post_id = get_the_ID();
    $podcast = Podcast::get();

    if (get_post_type($post_id) !== 'podcast') {
        return $original_title;
    }

    switch ($podcast->get_feed_episode_title_variant()) {
        case 'blog':
            return $original_title;

            break;
        case 'episode':
            $episode = Episode::find_one_by_post_id($post_id);

            if ($episode && $episode->title) {
                return trim(strip_tags($episode->title));
            }

            return $original_title;

            break;
        case 'template':
            $title = podlove_generated_feed_post_title($post_id);
            if ($title) {
                return $title;
            }

            return $original_title;

            break;

        default:
            return $original_title;
    }
}

function podlove_generated_post_title($post_id)
{
    $template = \Podlove\get_setting('website', 'blog_title_template');

    return podlove_get_episode_title_by_template($post_id, $template);
}

function podlove_generated_feed_post_title($post_id)
{
    $template = Podcast::get()->get_feed_episode_title_template();

    return podlove_get_episode_title_by_template($post_id, $template);
}

function podlove_get_episode_title_by_template($post_id, $template)
{
    $episode = Episode::find_one_by_post_id($post_id);

    if (!$template || !$episode) {
        return false;
    }

    $title = $template;
    $title = str_replace('%mnemonic%', strip_tags(podlove_get_mnemonic($post_id)), $title);
    $title = str_replace('%episode_number%', $episode->number_padded(), $title);

    $episode_title = trim(strip_tags((string) $episode->title));

    if (!$episode_title) {
        $episode_title = get_post($post_id)->post_title;
    }

    $title = str_replace('%episode_title%', $episode_title, $title);

    $title = apply_filters('podlove_generated_post_title', $title, $episode);

    return trim($title);
}

function podlove_override_post_title_script()
{
    if (!\Podlove\is_episode_edit_screen()) {
        return;
    }

    $data = [
        'enabled' => podlove_is_title_autogen_enabled(),
        'template' => \Podlove\get_setting('website', 'blog_title_template'),
        'episode_padding' => \Podlove\get_setting('website', 'episode_number_padding'),
        'mnemonic' => podlove_get_mnemonic(),
        'placeholder' => __('Fill in episode title below', 'podlove-podcasting-plugin-for-wordpress'),
    ];

    $data = apply_filters('podlove_js_data_for_post_title', $data, get_the_ID());
    ?>
<script type="text/javascript">
var PODLOVE = PODLOVE || {};
PODLOVE.override_post_title = <?php echo json_encode($data); ?>;
</script>
<?php
}

function podlove_get_mnemonic($post_id = null)
{
    $podcast = Podcast::get();

    return $podcast->mnemonic;
}

function podlove_is_title_autogen_enabled()
{
    return (bool) \Podlove\get_setting('website', 'enable_generated_blog_post_title');
}