WordPress to Buffer Pro: Convert Paragraphs to Breaklines

wp-to-buffer-pro-convert-paragraphs-to-breaklines.php

<?php
/**
* Plugin Name: WP to Buffer Pro: Convert Paragraphs to Breaklines in Statuses
* Plugin URI: http://www.wpzinc.com/
* Version: 0.0.1
* Author: WP Zinc
* Author URI: http://www.wpzinc.com
* Description: Modify the {content} output by converting paragraphs to breaklines
*/

/**
 * Modifies the Post Content generated from using the {content} status tag,
 * immediately before the status is sent to Buffer.
 *
 * @since   0.0.1
 *
 * @param   string 	$content 	Post Content
 * @param   WP_Post $post       WordPress Post
 * @return  string 				Post Content
 */
function wp_to_buffer_publish_modify_content( $content, $post ) {
    
	// Start over with the Post Content
	$content = $post->post_content;
	
	// Strip shortcodes
    $content = strip_shortcodes( $content );

    // Apply filters to get true output
    // This will convert newlines to paragraphs
    $content = apply_filters( 'the_content', $content );

    // Replace paragraphs with double breaklines from the original Post Content
    $content = preg_replace( '/<p(.*?)>((.*?)+)\<\/p>/', '${2}' . "\n\n", $post->post_content );

    // If the content originates from Gutenberg, remove double newlines and convert breaklines
    // into newlines
    if ( strpos( $post->post_content, '<!-- wp:' ) !== false ) {
        // Remove double newlines, which may occur due to using Gutenberg blocks
        // (blocks are separated with HTML comments, stripped using apply_filters( 'the_content' ), which results in double, or even triple, breaklines)
        $content = preg_replace('/(?:(?:\r\n|\r|\n)\s*){2}/s', "\n\n", $content );

        // Convert <br> and <br /> into newlines
        $content = preg_replace( '/<br(\s+)?\/?>/i', "\n", $content );
    }

    // Strip HTML Tags
    $content = strip_tags( $content );

    // Decode content to avoid encoding issues on status output
    $content = html_entity_decode( $content );

    // Finally, trim the output
    $content = trim( $content );

    // Return content
	return $content;

}

// Filter for Pro version of Plugin
add_filter( 'wp_to_buffer_pro_publish_get_content', 'wp_to_buffer_publish_modify_content', 10, 2 );