Import data "template" for wp cli, for importing into WordPress

mallory_import.php

<?php

/**
* /inc/class-migration-cli.php'
*/

class Migration_CLI extends WP_CLI_Command {

	/**
	* Imports data.
	*
	* ## OPTIONS
	*
	* ## EXAMPLES
	*
	*     wp --require=mallory_import.php import
	*
	* @synopsis
	*/

	public function migrate_data( '$args, $assoc_args ) {
		$this->connect_to_import_source();
		// `has_import_data()` returns true if there's more to process
		while ( $this->has_import_data() ) {

			// Extract:
			// `get_import_data()` gets next, and increments counter
			// This can also do a lot of your heavy lifting in extraction
			$row = $this->get_import_post();
			$post = array(
				'post_type' => 'post',
				'post_title' => $row['title'],
				'post_content' => $row['content'],
				'post_date' => date( 'Y-m-d H;i:s', strtotime( $row['date'] ) )
			);

			// Transform:
			if ( $row['is_slidewshow'] ) {
				$post['post_type'] = 'slideshow';
			}

			// Load:
			/*if ( $post_id = $this->new_post_exists( $row['id'] ) ) {
				$post['ID'] = $post_id;
				wp_update_post( $post );
				} else {
				$post_id = wp_insert_post( $post );
			}*/
			$post_id = wp_insert_post( $post );
			update_post_meta( $post_id, 'import_id', $row['id'] );

			if ( $row['is_slideshow'] ) {
				update_post_meta( $post_id, 'slides', $this->get_import_slides( … );
			}
		}
	}


	public function connect_to_import_source() {


	}

	public function has_import_data() {
		return true;

	}

	public function get_import_data() {

	}
}

WP_CLI::add_command( 'import', 'Migration_CLI' );