cmd

type Command interface {
	// Do performs the action.
	// An error is returned if the action could not be performed.
	Do(modder world.Modder) error

	// Undo reverses its action to restore the environment to the previous state.
	// An error is returned if the action could not be successfully undone. The
	// environment may not be in the state as before in an error occurred.
	Undo(modder world.Modder) error
}

type Commander interface {
	Queue(command Command)
}

type List []Command

type Registry interface {
	Commander
	Register(modifier ...TransactionModifier) error
}

type Stack struct {
	// contains filtered or unexported fields
}

type Task func(modder world.Modder) error

type Transaction struct {
	Name    string
	Forward []Task
	Reverse []Task
}

type TransactionBuilder struct {
	Commander Commander
	// contains filtered or unexported fields
}

type TransactionError struct {
	// Name is that of the transaction, if it was set.
	Name string
	// Index identifies the list index of tasks.
	Index int
	// Nested is the error returned from the task. In case of nested commands, this may be another TransactionError.
	Nested error
}

type TransactionModifier func(*Transaction) error