Filter Post Excerpt

/**
 * Filter the_excerpt to show content in a more ideal way.
 * https://stevengliebe.com/2015/02/26/excerpts-and-the-more-tag-in-wordpress-themes/
 *
 * The way content is shown depends on the priority of a situation:
 *
 * 1. the_content with "Read More" link if the "More" tag is used
 * 2. Manual excerpt with "Read More" link if excerpt is manually entered
 * 3. the_content in its entirety if less than 200 words (nicer than automatic excerpt)
 * 4. Automatic excerpt with "Read More" link if no better situation
 *
 * This is based on the handling of excerpts in churchthemes.com themes with improvements inspired
 * by Devin Price and commenters: http://wptheming.com/2015/01/excerpt-versus-content-for-archives/
 *
 * @global object $post
 * @param string $excerpt Excerpt from get_the_excerpt()
 * @return string Modified excerpt
 *
 * Modified so #1 above is not applied on the Home page
 * Modified to remove post title from Read More text
 */
function themeslug_the_excerpt( $excerpt ) {

        global $post;

        $show_excerpt = false;

        // Remove post title from "Read More" text
        /* translators: %s is post title (hidden, for screen readers) */
    /*
    $more_text = sprintf(
                __( 'Read More %s', 'themeslug' ),
                the_title( '<span class="screen-reader-text">&mdash; ', '</span>', false )
        */
    $more_text = sprintf(
                __( 'Read More', 'themeslug' ),
                the_title( '<span class="screen-reader-text">&mdash; ', '</span>', false )
        );

        // 1. the_content with "Read More" link if the "More" tag is used, but not password-protected
        // This is first because it is as intentional as manual excerpt but manual excerpt could have other purpose (ie. meta description)
        // Modified so not applied on the Home page
        if ( (! is_home()) && strpos( $post->post_content, '<!--more-->' ) && ! post_password_required() ) {
                the_content( $more_text );
        }

        // 2. Manual excerpt with "Read More" link if excerpt is manually provided
        elseif ( has_excerpt() ) {
                $show_excerpt = true;
        }

        // 3. the_content in its entirety if less than 200 words, but not password-protected (nicer than automatic excerpt)
        // A nice-looking fallback for when they do not use "more" or manual excerpt, or if only published a media embed
        elseif ( str_word_count( $post->post_content ) < 200 && ! post_password_required() ) {
                the_content();
        }

        // 4. Automatic excerpt if no better situation
        else {
                $show_excerpt = true;
        }

        // Show excerpt with "Read More"
        if ( $excerpt && $show_excerpt ) {

                ?>

                        <?php
                        // Manual or automatic excerpt
                        echo $excerpt;
                        ?>

                        <p>
                                <?php
                                // "Read More" linked
                                printf(
                                        '<a href="%1$s" class="more-link" rel="bookmark">%2$s</a>',
                                        esc_url( get_permalink() ),
                                        $more_text
                                );
                                ?>
                        </p>

                <?php

        }

}
add_filter( 'the_excerpt', 'themeslug_the_excerpt' );