migrate

type Flags struct {
	Force    bool
	Revert   bool
	Path     string // file path to migrate for fs based migrations
	Verbose  bool
	Help     bool
	NoRevert bool
}

type Migration interface {

	// Versions is the "v-to-v" version string.
	Versions() string

	// Reversible returns whether this migration can be reverted.
	// Endeavor to make them all reversible. This is here only to warn users
	// in case this is not the case.
	Reversible() bool

	// Apply applies the migration in question.
	Apply(Options) error

	// Revert un-applies the migration in question. This should be best-effort.
	// Some migrations are definitively one-way. If so, return an error.
	Revert(Options) error
}

type Options struct {
	Flags
	Verbose bool
}