// phaseRunner provides a wrapper to a Phase with the addition of a set
// of contextual information derived by the workflow managed by the Runner.
// TODO: If we ever decide to get more sophisticated we can swap this type with a well defined dag or tree library.
type phaseRunner struct {
	// Phase provide access to the phase implementation
	Phase

	// provide access to the parent phase in the workflow managed by the Runner.
	parent *phaseRunner

	// level define the level of nesting of this phase into the workflow managed by
	// the Runner.
	level int

	// selfPath contains all the elements of the path that identify the phase into
	// the workflow managed by the Runner.
	selfPath []string

	// generatedName is the full name of the phase, that corresponds to the absolute
	// path of the phase in the workflow managed by the Runner.
	generatedName string

	// use is the phase usage string that will be printed in the workflow help.
	// It corresponds to the relative path of the phase in the workflow managed by the Runner.
	u