[Really Simple CSV Importer] An example code to replace save_post method of Really Simple CSV Importer

rscsvimporter_replace_save_post.php

<?php
/*
Plugin Name: Replace save_post method of Really Simple CSV Importer
Description: This is an example add-on.
Author: Takuro Hishikawa
Version: 0.2
*/

class rscsvimporter_replace_save_post {
	// singleton instance
	private static $instance;
	
	public static function instance() {
		if ( isset( self::$instance ) )
			return self::$instance;
		
		self::$instance = new rscsvimporter_replace_save_post;
		self::$instance->run_init();
		return self::$instance;
	}
	
	public function __construct() {
		/** Do nothing **/
	}
	
	protected function run_init() {
		add_action( 'init', array( $this, 'add_filter' ) );
	}
	
	public function add_filter() {
		add_filter( 'really_simple_csv_importer_class', array( $this, 'return_class'));
	}
	
	public function return_class() {
		return get_class($this);
	}
	
	public function save_post($post, $meta, $terms, $thumbnail, $is_update) {
		
		if (!class_exists('wp_post_helper',false)) {
			return false;
		}
		$ph = new wp_post_helper($post);
		
		foreach ($meta as $key => $value) {
			// Add custom field if the given key already exists.
			// The default of third variable in Really Simple CSV Importer is true
			$ph->add_meta($key, $value, true);
		}

		foreach ($terms as $key => $value) {
			$ph->add_terms($key, $value);
		}
		
		if ($thumbnail) $ph->add_media($thumbnail,'','','',true);
		
		if ($is_update)
			$result = $ph->update();
		else
			$result = $ph->insert();
		
		// Set default post thumbnail (just an idea)
		if ($result && !$thumbnail) {
			set_post_thumbnail($ph->postid(),11);
		}
		
		unset($ph);
		
		return $result;
		
	}
	
}

$rscsvimporter_replace_save_post = rscsvimporter_replace_save_post::instance();

Hi Takuro!

Thanks a lot for the plugin!

I did more research in this direction and discovered one flaw:
I can't pass my error message to show it in admin-panel after import CSV.

If I don't want to save some post with rscsvimporter_replace_save_post then I see only the message: "An error occurred while saving the post to database.". It would be nice to show my own message.

Or may be there is a way to do it?
Thanks in advance for your support!