convert newlines to/from \n on export/import

includes/export/class-wc-product-csv-exporter.php

@@ -235,6 +235,10 @@ class WC_Product_CSV_Exporter extends WC_CSV_Batch_Exporter {
 				$value = $product->{"get_{$column_id}"}( 'edit' );
 			}
 
+			if ( 'description' == $column_id || 'short_description' == $column_id ) {
+				$value = $this->filter_description_field( $value );
+			}
+
 			$row[ $column_id ] = $value;
 		}
 
@@ -557,6 +561,20 @@ class WC_Product_CSV_Exporter extends WC_CSV_Batch_Exporter {
 		return $this->implode_values( $types );
 	}
 
+	/**
+	 * Filter description field for export.
+	 * Convert newlines to '\n'.
+	 *
+	 * @param string $description Product description text to filter.
+	 *
+	 * @since  3.5.4
+	 * @return string
+	 */
+	protected function filter_description_field( $description ) {
+		$description = str_replace( '\n', "\\\\n", $description );
+		$description = str_replace( "\n", '\n', $description );
+		return $description;
+	}
 	/**
 	 * Export downloads.
 	 *

includes/import/class-wc-product-csv-importer.php

@@ -571,6 +571,22 @@ class WC_Product_CSV_Importer extends WC_Product_Importer {
 		return intval( $value );
 	}
 
+	/**
+	 * Parse a description value field
+	 *
+	 * @param string $description field value.
+	 *
+	 * @return string
+	 */
+	public function parse_description_field( $description ) {
+		$parts = explode( "\\\\n", $description );
+		foreach ( $parts as $key => $part ) {
+			$parts[ $key ] = str_replace( '\n', "\n", $part );
+		}
+
+		return implode( '\\\n', $parts );
+	}
+
 	/**
 	 * Get formatting callback.
 	 *
@@ -590,8 +606,8 @@ class WC_Product_CSV_Importer extends WC_Product_Importer {
 			'date_on_sale_from' => array( $this, 'parse_date_field' ),
 			'date_on_sale_to'   => array( $this, 'parse_date_field' ),
 			'name'              => array( $this, 'parse_skip_field' ),
-			'short_description' => array( $this, 'parse_skip_field' ),
-			'description'       => array( $this, 'parse_skip_field' ),
+			'short_description' => array( $this, 'parse_description_field' ),
+			'description'       => array( $this, 'parse_description_field' ),
 			'manage_stock'      => array( $this, 'parse_bool_field' ),
 			'low_stock_amount'  => array( $this, 'parse_stock_quantity_field' ),
 			'backorders'        => array( $this, 'parse_backorders_field' ),