itinerary

type Flag = int16

type Itinerary struct {
	// Pipeline (list) of steps.
	Pipeline
	// Predicate.
	Predicate
	// Name.
	Name string
}

type Pipeline []Step

type Predicate interface {
	// Evaluate the condition.
	// Returns (true) when the step should be included.
	Evaluate(Flag) (bool, error)
}

type Progress struct {
	// Completed units.
	Completed int64 `json:"completed"`
	// Total units.
	Total int64 `json:"total"`
}

type Step struct {
	// Name.
	Name string
	// Any of these conditions be satisfied for
	// the step to be included.
	All Flag
	// All of these conditions be satisfied for
	// the step to be included.
	Any Flag
}