Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/imagify/classes/Bulk/BulkInterface.php

@@ -0,0 +1,61 @@
+<?php
+namespace Imagify\Bulk;
+
+/**
+ * Interface to use for bulk.
+ *
+ * @since 1.9
+ */
+interface BulkInterface {
+	/**
+	 * Get all unoptimized media ids.
+	 *
+	 * @since 1.9
+	 *
+	 * @param  int $optimization_level The optimization level.
+	 * @return array                   A list of unoptimized media. Array keys are media IDs prefixed with an underscore character, array values are the main file’s URL.
+	 */
+	public function get_unoptimized_media_ids( $optimization_level );
+
+	/**
+	 * Get ids of all optimized media without WebP versions.
+	 *
+	 * @since 1.9
+	 * @since 1.9.5 The method doesn't return the IDs directly anymore.
+	 *
+	 * @return array {
+	 *     @type array $ids    A list of media IDs.
+	 *     @type array $errors {
+	 *         @type array $no_file_path A list of media IDs.
+	 *         @type array $no_backup    A list of media IDs.
+	 *     }
+	 * }
+	 */
+	public function get_optimized_media_ids_without_webp();
+
+	/**
+	 * Tell if there are optimized media without WebP versions.
+	 *
+	 * @since 1.9
+	 *
+	 * @return int The number of media.
+	 */
+	public function has_optimized_media_without_webp();
+
+	/**
+	 * Get the context data.
+	 *
+	 * @since 1.9
+	 *
+	 * @return array {
+	 *     The formated data.
+	 *     The array keys corresponds to the table cell classes: "imagify-cell-{key}".
+	 *
+	 *     @type string $count-optimized Number of media optimized.
+	 *     @type string $count-errors    Number of media having an optimization error, with a link to the page listing the optimization errors.
+	 *     @type string $optimized-size  Optimized filesize.
+	 *     @type string $original-size   Original filesize.
+	 * }
+	 */
+	public function get_context_data();
+}