Code-Snippets-Functions/Execute a function on a child site/Jetpack/customize-default-sharing-message-mastodon.txt

function jeherve_custom_mastodon_message( $message, $post ) {
    /*
     * Let's build some basic information about the post.
     * Post title, link, excerpt.
     */
    $post_title   = get_the_title( $post );
    $post_link    = get_permalink( $post );
    $post_excerpt = get_the_excerpt( $post );
 
    /*
     * Let's build an array of tags.
     * We'll massage the output a bit to add hashtags in front of each tag.
     * We'll capitalize the first letter of each word, for better accessibility.
     */
    $post_tags_array = get_the_tags( $post );
    if ( ! $post_tags_array ) {
        $post_tags_array = array();
    } else {
        $post_tags_array = array_map(
            function ( $tag ) {
                // Camel case the tag name and remove spaces as well as apostrophes.
                $tag = preg_replace( '/\s+|\'/', '', ucwords( $tag->name ) );
 
                // Return with a '#' prepended.
                return '#' . $tag;
            },
            $post_tags_array
        );
    }
    // Build a string of tags.
    $post_tags = implode( ', ', $post_tags_array );
 
    /*
     * And now we build our final message.
     * This is of course just an example, you can build any output you want.
     *
     * For example, once Mastodon supports Markdown,
     * you could use Markdown to build a really fancy-looking message.
     * @see https://github.com/mastodon/mastodon/issues/18958
     */
    return sprintf(
        'I just came across %1$s. Here is an excerpt: %2$s -- Read more at %3$s %4$s',
        esc_html( $post_title ),
        esc_html( $post_excerpt ),
        esc_url( $post_link ),
        esc_html( $post_tags )
    );
}
add_filter( 'jetpack_sharing_mastodon_default_message', 'jeherve_custom_mastodon_message', 10, 2 );