Made some cli procedures available for other packages

Unfortunately we cannot limit the availability of the cli.core.* package
to the cli.* packages, but they are now available as public API.

Author: cmaglie

cli/core/update_index.go

@@ -44,7 +44,11 @@ func initUpdateIndexCommand() *cobra.Command {
 func runUpdateIndexCommand(cmd *cobra.Command, args []string) {
 	inst := instance.CreateInstanceAndRunFirstUpdate()
 	logrus.Info("Executing `arduino-cli core update-index`")
+	UpdateIndex(inst)
+}
 
+// UpdateIndex updates the index of platforms.
+func UpdateIndex(inst *rpc.Instance) {
 	err := commands.UpdateIndex(context.Background(), &rpc.UpdateIndexRequest{Instance: inst}, output.ProgressBar())
 	if err != nil {
 		feedback.Error(err)

cli/lib/update_index.go

@@ -44,7 +44,11 @@ func initUpdateIndexCommand() *cobra.Command {
 func runUpdateIndexCommand(cmd *cobra.Command, args []string) {
 	inst := instance.CreateInstanceAndRunFirstUpdate()
 	logrus.Info("Executing `arduino-cli lib update-index`")
+	UpdateIndex(inst)
+}
 
+// UpdateIndex updates the index of libraries.
+func UpdateIndex(inst *rpc.Instance) {
 	err := commands.UpdateLibrariesIndex(context.Background(), &rpc.UpdateLibrariesIndexRequest{
 		Instance: inst,
 	}, output.ProgressBar())

cli/lib/upgrade.go

@@ -46,13 +46,17 @@ func initUpgradeCommand() *cobra.Command {
 func runUpgradeCommand(cmd *cobra.Command, args []string) {
 	instance := instance.CreateAndInit()
 	logrus.Info("Executing `arduino-cli lib upgrade`")
+	Upgrade(instance, args)
+}
 
+// Upgrade upgrades the specified libraries
+func Upgrade(instance *rpc.Instance, libraries []string) {
 	var upgradeErr error
-	if len(args) == 0 {
+	if len(libraries) == 0 {
 		req := &rpc.LibraryUpgradeAllRequest{Instance: instance}
 		upgradeErr = lib.LibraryUpgradeAll(req, output.ProgressBar(), output.TaskProgress())
 	} else {
-		for _, libName := range args {
+		for _, libName := range libraries {
 			req := &rpc.LibraryUpgradeRequest{
 				Instance: instance,
 				Name:     libName,