gistfile1.txt

<?php
/*
 * Plugin Name:    Marketpress csv converter
Author:         Hoang
Version:        1.0
 */

add_action('admin_menu', 'mpc_admin_menu');
function mpc_admin_menu()
{
    add_menu_page('MarketPress CSV', 'MarketPress CSV', 'manage_options', 'mpc-main', 'convert_csv_to_mp');
}

function convert_csv_to_mp()
{
    if (isset($_POST['submit_csv'])) {
        if (isset($_FILES['csv']) && !empty($_FILES['csv']['name'])) {
            $file = mpc_convert_csv($_FILES['csv']['tmp_name']);
            echo 'You can download your file <a download="" href="' . plugin_dir_url(__FILE__) . $file . '">here</a>';
        } else {
            echo 'Please upload a csv file';
        }

    }
    ?>
    <div class="wrap">
        <h2>Convert CSV to MP format</h2>

        <form method="post" enctype="multipart/form-data">
            <input type="file" name="csv">
            <button name="submit_csv" type="submit">Submit</button>
        </form>
    </div>
<?php
}

function mpc_import_to_mp()
{
    //Update this variable to your need
    $raw_file_path = plugin_dir_path(__FILE__) . 'sampleCSV.csv';

    $converted_file_path = mpc_convert_csv($raw_file_path);
    $importer = new CsvImporterFork();
    $importer->process(plugin_dir_path(__FILE__) . $converted_file_path);
}


function mpc_convert_csv($csv_path)
{
    //$csv_path = plugin_dir_path(__FILE__) . 'sampleCSV.csv';
    $csvData = file_get_contents($csv_path);
    $lines = explode(PHP_EOL, $csvData);
    $array = array();
    foreach ($lines as $line) {
        $array[] = str_getcsv($line, ";");
    }
    //restruct the csv
    $header = array_shift($array);
    $products = array();
    $array = array_filter($array);
    foreach ($array as $row) {
        if (count($row) == count($header)) {
            $products[] = array_combine($header, $row);
        }
    }
    //got the array, convert to MP csv
    $mp_convert = array();
    foreach ($products as $prod) {
        $mp_convert[] = array(
            'title' => $prod['Label'],
            'description' => $prod['Description'],
            'sku' => $prod['SKU'],
            'price' => $prod['Price'],
            'sale_price' => '',
            'tags' => $prod['Brand'],
            'categories' => $prod['Category'],
            'stock' => '',
            'external_link' => '',
            'download_url' => '',
            'sales_count' => '',
            'extra_shipping' => $prod['Delivery'],
            'weight' => $prod['Weight'],
            'image' => $prod['Picture']
        );
    }
    //add header
    if (count($mp_convert)) {
        $header = array_keys($mp_convert[0]);
        //flat
        /*foreach ($mp_convert as &$row) {
            $row = implode(',', $row);
        }*/
        $mp_convert = array_merge(array($header), $mp_convert);
        $cv_file = time() . '_converted.csv';
        //var_dump($mp_convert);
        //create csv file
        $fp = fopen(plugin_dir_path(__FILE__) . $cv_file, 'w');
        foreach ($mp_convert as $row) {
            fputcsv($fp, $row, ";");
        }
        fclose($fp);
        return $cv_file;
    }
}

if (!class_exists('MarketPress_Importer')) {
    $path = $dir = ABSPATH . 'wp-content/plugins/';
    require_once $path . 'marketpress/marketpress-includes/marketpress-importers.php';
}

class CsvImporterFork extends MarketPress_Importer
{

    var $importer_name = 'CSV';

    function process($path)
    {
        global $wpdb;

        set_time_limit(120); //this can take a while
        $this->results = 0;
        $products = $this->get_csv_array($path);

        $dirs = wp_upload_dir();

        foreach ($products as $row) {
            $product = array();

            if (empty($row['title']) || (empty($row['price']) && MP_IMPORT_ALLOW_NO_PRICE === false))
                continue;

            //import product
            $product['post_title'] = $row['title'];
            $product['post_content'] = $row['description'];
            $product['post_type'] = 'product';
            $product['comment_status'] = 'closed';
            $product['comment_count'] = 0;

            /**
             * Filter the imported post status
             *
             * @since 2.9.5.5
             * @param string The default post status - e.g. "draft"
             */
            $product['post_status'] = apply_filters('mp_imported_product_post_status', 'draft');

            //add tags
            if (!empty($row['tags']))
                $product['tax_input']['product_tag'] = trim($row['tags']);

            $new_id = wp_insert_post($product); //create the post

            //insert categories
            if (!empty($row['categories'])) {
                $product_cats = explode(',', trim($row['categories']));
                $product_cats = array_map('trim', $product_cats);
                wp_set_object_terms($new_id, $product_cats, 'product_category');
            }

            //add product meta
            update_post_meta($new_id, 'mp_sku', array(preg_replace("/[^a-zA-Z0-9_-]/", "", trim(@$row['sku'])))); //add sku
            update_post_meta($new_id, 'mp_price', array(round((float)preg_replace('/[^0-9.]/', '', $row['price']), 2))); //add price
            update_post_meta($new_id, 'mp_var_name', array('')); //add blank var name

            //add sale price only if set
            if (!empty($row['sale_price'])) {
                update_post_meta($new_id, 'mp_is_sale', 1);
                update_post_meta($new_id, 'mp_sale_price', array(round((float)preg_replace('/[^0-9.]/', '', $row['sale_price']), 2)));
                update_post_meta($new_id, 'mp_price_sort', round((float)preg_replace('/[^0-9.]/', '', $row['sale_price']), 2));
            } else {
                update_post_meta($new_id, 'mp_is_sale', 0);
                update_post_meta($new_id, 'mp_price_sort', round((float)preg_replace('/[^0-9.]/', '', $row['price']), 2));
            }

            //add stock count if set
            if (is_numeric($row['stock'])) {
                update_post_meta($new_id, 'mp_track_inventory', 1);
                update_post_meta($new_id, 'mp_inventory', array(intval($row['stock'])));
            } else {
                update_post_meta($new_id, 'mp_track_inventory', 0);
            }

            //add external link
            if (!empty($row['external_link']))
                update_post_meta($new_id, 'mp_product_link', esc_url_raw($row['external_link']));

            //add shipping info
            $shipping = array();
            if (!empty($row['extra_shipping']))
                $shipping['extra_cost'] = round((float)preg_replace('/[^0-9.]/', '', $row['extra_shipping']), 2);
            if (!empty($row['weight']))
                $shipping['weight'] = round((float)preg_replace('/[^0-9.]/', '', $row['weight']), 2);
            update_post_meta($new_id, 'mp_shipping', $shipping);

            //download
            if (!empty($row['download_url']))
                update_post_meta($new_id, 'mp_file', esc_url_raw($row['download_url']));

            //download
            if (isset($row['sales_count']))
                update_post_meta($new_id, 'mp_sales_count', intval($row['sales_count']));

            //add featured images
            if (isset($row['image']) && !empty($row['image'])) {
                // Determine if this file is in our server
                $img_location = '/' . str_replace($dirs['baseurl'], $dirs['basedir'], $row['image']); // make sure this is a path and not a url
                $img_location = str_replace('//', '/', $img_location); // remove double slashes - just in case

                if (false === strpos($img_location, $dirs['basedir'])) {
                    $img_location_rel = $img_location;
                    $img_location_abs = $dirs['basedir'] . $img_location;
                } else {
                    $img_location_rel = str_replace($dirs['basedir'], '', $img_location);
                    $img_location_abs = $img_location;
                }

                $img_location_rel = ltrim($img_location_rel, '/');

                // Check if image exists in database
                $cache_key = md5($row['image']);
                $attachment_id = wp_cache_get($cache_key, 'mp_csv_importer');
                if (false === $attachment_id) {
                    $attachment_id = $wpdb->get_var($wpdb->prepare("
						SELECT post_id
						FROM $wpdb->postmeta
						WHERE meta_key = '_wp_attached_file'
						AND meta_value = %s
						LIMIT 1", $img_location_rel
                    ));
                }

                if ($attachment_id) {
                    update_post_meta($new_id, '_thumbnail_id', $attachment_id);
                } elseif (file_exists($img_location_abs)) {
                    preg_match('/[^\?]+\.(jpe?g|jpe|gif|png)\b/i', $img_location_abs, $matches);
                    $file_array = array(
                        'name' => basename($matches[0]),
                        'tmp_name' => $img_location_abs,
                    );

                    // Attach image to post
                    $attachment_id = media_handle_sideload($file_array, $new_id, $row['title']);
                    if (!is_wp_error($attachment_id)) {
                        // add featured image to post
                        update_post_meta($new_id, '_thumbnail_id', $attachment_id);
                    }
                } else { //download the image and attach
                    require_once(ABSPATH . '/wp-admin/includes/file.php');
                    $img_html = media_sideload_image($row['image'], $new_id, $row['title']);
                    if (!is_wp_error($img_html)) {
                        //figure out the id
                        $args = array(
                            'numberposts' => 1,
                            'order' => 'DESC',
                            'post_mime_type' => 'image',
                            'post_parent' => $new_id,
                            'post_type' => 'attachment'
                        );

                        $get_children_array = get_children($args, ARRAY_A);  //returns Array ( [$image_ID]...
                        $rekeyed_array = array_values($get_children_array);
                        $child_image = $rekeyed_array[0];
                        $attachment_id = $child_image['ID'];
                        // add featured image to post
                        update_post_meta($new_id, '_thumbnail_id', $attachment_id);
                        wp_cache_set($cache_key, $attachment_id, 'mp_csv_importer');
                    }
                }

                wp_cache_set($cache_key, $attachment_id, 'mp_csv_importer');
            }

            //inc count
            $this->results++;
        }
    }

    function get_csv_headers($file_path)
    {
        @ini_set('auto_detect_line_endings', true); //so it doesn't choke on mac CR line endings
        $fh = @fopen($file_path, 'r');
        if ($fh) {
            $temp_fields = fgetcsv($fh, 5120, ";"); // 5KB

            if (is_array($temp_fields))
                $headers = array_map('strtolower', $temp_fields);

            fclose($fh);

            return $headers;
        } else {
            return false;
        }
    }

    function get_csv_array($file_path)
    {
        $i = 0;
        @ini_set('auto_detect_line_endings', true); //so it doesn't choke on mac CR line endings
        $fh = @fopen($file_path, 'r');
        if ($fh) {
            while (!feof($fh)) {
                //parse csv line
                $temp_fields = fgetcsv($fh, 5120, ";"); // 5KB

                if (is_array($temp_fields)) {
                    if (!isset($titles))
                        $titles = array_map('strtolower', $temp_fields);

                    //switch keys out for titles
                    $new_fields = array();
                    foreach ($temp_fields as $key => $value) {
                        $new_fields[$titles[$key]] = $value;
                    }
                    $fields[] = $new_fields;
                }
            }


            fclose($fh);

            //remove header row
            array_shift($fields);

            return $fields;
        } else {
            return false;
        }
    }
}

Last weekend I added a $factor variable in mpc_convert_csv(), and set it to 1.1 for testing purposes.

I also edited line 73:
'price' => strval(round(floatval($prod['Price']) * $factor, 2)),

and I also edited line 75:
'tags' => $prod['Brand'] . "," . $prod['Market'] . "," . $prod['Segment'],

I tested this, and foud it to be working. However, I don't think the import function is called.