log

type Formatter interface {
	Name() string

	PrintLine(io.Writer, string)
}

type Logger interface {
	// Start starts the logger.
	Start(context.Context, io.Writer) error

	// Stop stops the logger.
	Stop()

	// Mute mutes the logger.
	Mute()

	// Unmute unmutes the logger.
	Unmute()

	// SetSince sets the original timestamp for the logger.
	SetSince(time.Time)

	// RegisterArtifacts tracks build artifacts inside of a logger.
	// The logger sometimes uses information about the currently deployed artifacts
	// to actually retrieve logs (e.g. the Kubernetes PodSelector). Thus, we need to
	// track the current build artifacts in the logger.
	RegisterArtifacts([]graph.Artifact)
}

type LoggerMux []Logger

type NoopLogger struct{}