feat: add transaction option to CreateSQLMigrations

Allow CreateSQLMigrations to use .tx.sql and use a transactional template

example/migrate/main.go

@@ -128,7 +128,7 @@ func newDBCommand(migrator *migrate.Migrator) *cli.Command {
 				Usage: "create up and down SQL migrations",
 				Action: func(c *cli.Context) error {
 					name := strings.Join(c.Args().Slice(), "_")
-					files, err := migrator.CreateSQLMigrations(c.Context, name)
+					files, err := migrator.CreateSQLMigrations(c.Context, name, false)
 					if err != nil {
 						return err
 					}

migrate/migrator.go

@@ -268,18 +268,26 @@ func (m *Migrator) CreateGoMigration(
 }
 
 // CreateSQLMigrations creates an up and down SQL migration files.
-func (m *Migrator) CreateSQLMigrations(ctx context.Context, name string) ([]*MigrationFile, error) {
+func (m *Migrator) CreateSQLMigrations(ctx context.Context, name string, transactional bool) ([]*MigrationFile, error) {
 	name, err := m.genMigrationName(name)
 	if err != nil {
 		return nil, err
 	}
 
-	up, err := m.createSQL(ctx, name+".up.sql")
+	upSuffix := ".up.sql"
+	downSuffix := ".down.sql"
+
+	if transactional {
+		upSuffix = ".up.tx.sql"
+		downSuffix = ".down.tx.sql"
+	}
+
+	up, err := m.createSQL(ctx, name+upSuffix)
 	if err != nil {
 		return nil, err
 	}
 
-	down, err := m.createSQL(ctx, name+".down.sql")
+	down, err := m.createSQL(ctx, name+downSuffix)
 	if err != nil {
 		return nil, err
 	}