initial commit

migrate.go

@@ -0,0 +1,47 @@
+package sqaffold
+
+import (
+	"code.aneur.in/go/version"
+)
+
+func (s *Scaffold) Migrate() error {
+	if err := s.migrateApp("sqaffold", s.migration()); err != nil {
+		return Err(err)
+	}
+
+	for appName, migration := range s.apps {
+		if err := s.migrateApp(appName, migration); err != nil {
+			return Err(err)
+		}
+	}
+
+	return nil
+}
+
+func (s *Scaffold) migrateApp(appName string, migration version.Migration) error {
+	currentVersion, err := s.GetVersion(appName)
+	if err != nil {
+		return err
+	}
+
+	required, err := migration.Match(&version.Constraint{Gt: currentVersion})
+	if err != nil {
+		return err
+	}
+
+	versions, _ := required.Versions()
+	if len(versions) == 0 {
+		return nil
+	}
+
+	var updateVersion *version.Version
+	err = migration.Up(func(applied, next *version.Version) {
+		updateVersion = applied
+	})
+
+	if updateVersion != nil {
+		s.setVersion(appName, updateVersion)
+	}
+
+	return err
+}