build: prepare tools and basic build

src/Version/Comparator.php

-<?php declare(strict_types=1);
+<?php
+declare(strict_types=1);
 
 namespace WPDesk\Migrations\Version;
 

src/Version/MigrationFactory.php

@@ -4,7 +4,7 @@ namespace WPDesk\Migrations\Version;
 
 use WPDesk\Migrations\AbstractMigration;
 
-interface MigrationFactory
-{
+interface MigrationFactory {
+
 	public function create_version( string $migration_class): AbstractMigration;
 }

src/Version/Version.php

-<?php declare(strict_types=1);
+<?php
+declare(strict_types=1);
 
 namespace WPDesk\Migrations\Version;
 
 final class Version {
 
+	/** @var string */
 	private $version;
 
 	public function __construct( string $version ) {

src/Version/WpdbMigrationFactory.php

-<?php declare(strict_types=1);
+<?php
+declare(strict_types=1);
 
 namespace WPDesk\Migrations\Version;
 
 use Psr\Log\LoggerInterface;
 use WPDesk\Migrations\AbstractMigration;
 
-class WpdbMigrationFactory implements MigrationFactory
-{
+class WpdbMigrationFactory implements MigrationFactory {
 
+	/** @var \wpdb */
 	protected $wpdb;
+
+	/** @var LoggerInterface */
 	protected $logger;
 
 	public function __construct( \wpdb $wpdb, LoggerInterface $logger ) {

src/WpdbLogger.php

-<?php declare(strict_types=1);
+<?php
+declare(strict_types=1);
 
 namespace WPDesk\Migrations;
 
@@ -10,16 +11,17 @@ class WpdbLogger implements \Psr\Log\LoggerInterface {
 	private const DB_LOG       = 'omnibus_db_log';
 	private const MAX_LOG_SIZE = 30;
 
+	/** @var string[] */
 	private $log;
 
 	public function __construct() {
-        $this->log            = json_decode( get_option( self::DB_LOG, '[]' ), true );
+		$this->log = json_decode( get_option( self::DB_LOG, '[]' ) );
 		if ( ! \is_array( $this->log ) ) {
 			$this->log = [];
 		}
 	}
 
-    public function log($level, $message, array $context = array()) {
+	public function log( $level, $message, array $context = [] ) {
 		$this->log[] = date( 'Y-m-d G:i:s' ) . sprintf( ': %s', $message );
 		if ( \count( $this->log ) > self::MAX_LOG_SIZE ) {
 			array_shift( $this->log );

src/WpdbMigrator.php

-<?php declare(strict_types=1);
+<?php
+declare(strict_types=1);
 
 namespace WPDesk\Migrations;
 
 use Psr\Log\LoggerInterface;
 use WPDesk\Migrations\Finder\GlobFinder;
 use WPDesk\Migrations\Version\AlphabeticalComparator;
+use WPDesk\Migrations\Version\Comparator;
 use WPDesk\Migrations\Version\Version;
 use WPDesk\Migrations\Version\WpdbMigrationFactory;
 
@@ -14,11 +16,18 @@ class WpdbMigrator implements Migrator {
 	/** @var \wpdb */
 	private $wpdb;
 
+	/** @var MigrationsRepository */
 	private $migrations_repository;
 
+	/** @var Comparator */
+	private $comparator;
+
+	/** @var LoggerInterface */
 	private $logger;
 
-    public static function fromWpdb(\wpdb $wpdb, array $migration_directories): self {
+	/** @param string[] $migration_directories */
+	public static function fromDirectories( array $migration_directories ): self {
+		global $wpdb;
 		$logger = new WpdbLogger();
 
 		return new self(
@@ -29,8 +38,30 @@ class WpdbMigrator implements Migrator {
 				new WpdbMigrationFactory(
 					$wpdb,
 					$logger
-                )
 				),
+				new AlphabeticalComparator()
+			),
+			new AlphabeticalComparator(),
+			$logger
+		);
+	}
+
+	/** @param class-string<AbstractMigration>[] $migration_class_names */
+	public static function fromClasses( array $migration_class_names ): self {
+		global $wpdb;
+		$logger = new WpdbLogger();
+
+		return new self(
+			$wpdb,
+			new ArrayMigrationsRepository(
+				$migration_class_names,
+				new WpdbMigrationFactory(
+					$wpdb,
+					$logger
+				),
+				new AlphabeticalComparator()
+			),
+			new AlphabeticalComparator(),
 			$logger
 		);
 	}
@@ -38,10 +69,12 @@ class WpdbMigrator implements Migrator {
 	public function __construct(
 		\wpdb $wpdb,
 		MigrationsRepository $migrations_repository,
+		Comparator $comparator,
 		LoggerInterface $logger
 	) {
 		$this->wpdb                  = $wpdb;
 		$this->migrations_repository = $migrations_repository;
+		$this->comparator            = $comparator;
 		$this->logger                = $logger;
 	}
 
@@ -55,9 +88,8 @@ class WpdbMigrator implements Migrator {
 		$this->logger->info( 'DB update start' );
 		$current_version = $this->get_current_version();
 
-        $comparator = new AlphabeticalComparator();
 		foreach ( $this->migrations_repository->get_migrations() as $migration ) {
-            if ( $comparator->compare($migration->get_version(), $this->get_current_version()) ) {
+			if ( $this->comparator->compare( $migration->get_version(), $this->get_current_version() ) ) {
 				$this->logger->info( sprintf( 'DB update %s:%s', $current_version, $migration->get_version() ) );
 				try {
 					$migration->get_migration()->up();