Refactoring changes

src/DB_Command.php

@@ -599,7 +599,7 @@ public function export( $args, $assoc_args ) {
 
 		if ( WP_SQLite_Export::get_sqlite_version() ) {
 			$export = new WP_SQLite_Export();
-			$export->run();
+			$export->run( $result_file, $assoc_args );
 			return;
 		}
 

src/WP_SQLite_Export.php

@@ -3,19 +3,42 @@
 class WP_SQLite_Export extends WP_SQLite_Base {
 
 
-	public function run() {
-		$this->load_dependencies();
-		WP_CLI::line( 'Exporting database...' );
+	private $unsupported_arguments = [
+		'fields',
+		'include-tablespaces',
+		'defaults',
+		'db_user',
+		'db_pass',
+		'tables',
+		'exclude-tables'
+	];
 
-		$translator = new WP_SQLite_Translator();
+	/**
+	 * Run the export command.
+	 *
+	 * @param string $result_file The file to write the exported data to.
+	 * @param array  $args        The arguments passed to the command.
+	 *
+	 * @return void
+	 * @throws Exception
+	 */
+	public function run( $result_file, $args ) {
 
-		$result = $translator->query('SHOW TABLES ');
-		$pdo = $translator->get_pdo();
+		if ( array_intersect_key( $args, array_flip( $this->unsupported_arguments ) ) ) {
+			WP_CLI::error(
+				sprintf(
+					'The following arguments are not supported by SQLite exports: %s',
+					implode( ', ', $this->unsupported_arguments )
+				)
+			);
+			return;
+		}
 
-		// Stream into a file
-		$handle = fopen( 'export.sql', 'w' );
+		$this->load_dependencies();
+		$translator = new WP_SQLite_Translator();
+		$handle     = fopen( 'export.sql', 'w' );
 
-		foreach ( $result as $table ) {
+		foreach ( $translator->query('SHOW TABLES') as $table ) {
 
 			$ignore_tables = [
 				'_mysql_data_types_cache',
@@ -27,25 +50,36 @@ public function run() {
 				continue;
 			}
 
-			$create = $translator->query('SHOW CREATE TABLE ' . $table->name );
-			var_dump($create);
 			fwrite($handle, "DROP TABLE IF EXISTS `" . $table->name ."`;\n");
-			fwrite( $handle, $create[0]->{'Create Table'} . "\n" );
-
-			$stmt = $pdo->prepare('SELECT * FROM ' . $table->name );
-			$stmt->execute();
-			while ( $row = $stmt->fetch(PDO::FETCH_ASSOC, PDO::FETCH_ORI_NEXT) ) {
-				// Process the row here
-				// Rows are fetched in batches from the server
-				$insert_statement = sprintf("INSERT INTO `%1s` VALUES (%2s);", $table->name, $this->escape_values( $pdo, $row ));
+			fwrite( $handle, $this->get_create_statement( $table, $translator ) . "\n" );
 
+			foreach( $this->get_insert_statements( $table, $translator->get_pdo() ) as $insert_statement ) {
 				fwrite( $handle, $insert_statement . "\n" );
 			}
 		}
 
+		if ( $args['porcelain'] ) {
+			WP_CLI::line( $result_file );
+		} else {
+			WP_CLI::line( 'Export complete. File written to ' . $result_file );
+		}
+
 		fclose( $handle );
 	}
 
+	protected function get_create_statement( $table, $translator ) {
+		$create = $translator->query('SHOW CREATE TABLE ' . $table->name );
+		return $create[0]->{'Create Table'};
+	}
+
+	protected function get_insert_statements( $table, $pdo ) {
+		$stmt = $pdo->prepare('SELECT * FROM ' . $table->name );
+		$stmt->execute();
+		while ( $row = $stmt->fetch(PDO::FETCH_ASSOC, PDO::FETCH_ORI_NEXT) ) {
+			yield sprintf("INSERT INTO `%1s` VALUES (%2s);", $table->name, $this->escape_values( $pdo, $row ));
+		}
+	}
+
 	/**
 	 * Escape values for insert statement
 	 *