Removed dead code experiment for event handler

Author: cmaglie

arduino/cores/packagemanager/package_manager.go

@@ -57,17 +57,6 @@ type PackageManager struct {
 	PackagesDir *paths.Path
 	DownloadDir *paths.Path
 	TempDir     *paths.Path
-
-	// TODO: This might be a list in the future, but would it be of any help?
-	eventHandler EventHandler
-}
-
-// EventHandler defines the events that are generated by the PackageManager
-// Subscribing to such events allows, for instance, to print out logs of what is happening
-// (say you use them for a CLI...)
-type EventHandler interface {
-	// FIXME: This is temporary, for prototyping (an handler should not return an handler; besides, this leakes
-	// the usage of releases...)
 }
 
 // NewPackageManager returns a new instance of the PackageManager
@@ -219,21 +208,6 @@ func (pm *PackageManager) ResolveFQBN(fqbn *cores.FQBN) (
 	return targetPackage, platformRelease, board, buildProperties, buildPlatformRelease, nil
 }
 
-// FIXME add an handler to be invoked on each verbose operation, in order to let commands display results through the formatter
-// as for the progress bars during download
-func (pm *PackageManager) RegisterEventHandler(eventHandler EventHandler) {
-	if pm.eventHandler != nil {
-		panic("Don't try to register another event handler to the PackageManager yet!")
-	}
-
-	pm.eventHandler = eventHandler
-}
-
-// GetEventHandlers returns a slice of the registered EventHandlers
-func (pm *PackageManager) GetEventHandlers() []*EventHandler {
-	return append([]*EventHandler{}, &pm.eventHandler)
-}
-
 // LoadPackageIndex loads a package index by looking up the local cached file from the specified URL
 func (pm *PackageManager) LoadPackageIndex(URL *url.URL) error {
 	indexPath := pm.IndexDir.Join(path.Base(URL.Path))

commands/commands.go

@@ -94,13 +94,6 @@ func InitPackageManager() *packagemanager.PackageManager {
 		}
 	}
 
-	// TODO: were should we register the event handler? Multiple places?
-	if len(pm.GetEventHandlers()) == 0 {
-		// During tests this could get registered multiple times,
-		// since there is an underlying singleton
-		pm.RegisterEventHandler(&CLIPackageManagerEventHandler{})
-	}
-
 	if err := pm.LoadHardware(Config); err != nil {
 		formatter.PrintError(err, "Error loading hardware packages.")
 		os.Exit(ErrCoreConfig)
@@ -183,11 +176,3 @@ func InitSketch(sketchPath *paths.Path) (*sk.Sketch, error) {
 	logrus.Infof("Reading sketch from dir: %s", wd)
 	return sketches.NewSketchFromPath(wd)
 }
-
-// CLIPackageManagerEventHandler defines an event handler which outputs the PackageManager events
-// in the CLI format
-type CLIPackageManagerEventHandler struct{}
-
-// Implement packagemanager.EventHandler interface
-
-// END -- Implement packagemanager.EventHandler interface