gestalt

type Action func(Evaluator) error

type Component interface {
	Name() string
	IsPassThrough() bool
	Eval(Evaluator) error
	WithMeta(vars.Meta) Component
	Meta() vars.Meta
}

type CompositeComponent interface {
	Component
	Children() []Component
}

type Error interface {
	ErrorWithDetail
	Path() string
}

type ErrorWithDetail interface {
	Error() string
	Detail() string
}

type Evaluator interface {
	Log() logrus.FieldLogger
	Logger() Logger
	Path() string

	Evaluate(Component) error
	Fork(Component) error

	Emit(string, string)
	Vars() vars.Vars

	Message(string, ...interface{})

	Context() context.Context

	Stop()
	Wait()

	HasError() bool
	ClearError()
	Errors() []error

	Root() Component
}

type Logger interface {
	Log() logrus.FieldLogger
	CloneFor(string) Logger
	Clone() Logger

	Start()
	Message(string, ...interface{})
	Dump(string)
	Stop(error)
}

type Runner interface {
	WithArgs([]string) Runner
	WithComponent(Component) Runner
	WithTerminate(func(status int)) Runner
	Run()
}

type Traverser interface {
	Path() string
}

type Unresolved struct {
	Path string
	Name string
}

type Visitor interface {
	Push(Traverser, Component)
	Pop(Traverser, Component)
}