Implement 'attach board' using sketch project file

Author: cmaglie

Diff for: arduino/sketch/sketch.go

@@ -308,6 +308,20 @@ func (s *Sketch) GetDefaultPortAddressAndProtocol() (string, string) {
 	return s.Project.DefaultPort, s.Project.DefaultProtocol
 }
 
+// SetDefaultFQBN sets the default FQBN for the sketch and saves it in the sketch.yaml project file.
+func (s *Sketch) SetDefaultFQBN(fqbn string) error {
+	s.Project.DefaultFqbn = fqbn
+	return s.SaveProjectFile()
+}
+
+// SetDefaultPort sets the default port address and port protocol for the sketch and saves it in the
+// sketch.yaml project file.
+func (s *Sketch) SetDefaultPort(address, protocol string) error {
+	s.Project.DefaultPort = address
+	s.Project.DefaultProtocol = protocol
+	return s.SaveProjectFile()
+}
+
 // InvalidSketchFolderNameError is returned when the sketch directory doesn't match the sketch name
 type InvalidSketchFolderNameError struct {
 	SketchFolder *paths.Path

Diff for: cli/board/attach.go

@@ -55,21 +55,22 @@ func runAttachCommand(path string, port *arguments.Port, fqbn string) {
 
 	address, protocol, _ := port.GetPortAddressAndProtocol(nil, sk)
 	if address != "" {
-		sk.Metadata.CPU.Port = address
-		sk.Metadata.CPU.Protocol = protocol
-		msg := fmt.Sprintf("%s: %s", tr("Set port to"), address)
+		if err := sk.SetDefaultPort(address, protocol); err != nil {
+			feedback.Errorf("%s: %s", tr("Error saving sketch metadata"), err)
+			os.Exit(errorcodes.ErrGeneric)
+		}
+		msg := fmt.Sprintf("%s: %s", tr("Default port set to"), address)
 		if protocol != "" {
-			msg += " / " + protocol
+			msg += " (" + protocol + ")"
 		}
 		feedback.Print(msg)
 	}
 	if fqbn != "" {
-		sk.Metadata.CPU.Fqbn = fqbn
-		msg := fmt.Sprintf("%s: %s", tr("Set FQBN to"), fqbn)
+		if err := sk.SetDefaultFQBN(fqbn); err != nil {
+			feedback.Errorf("%s: %s", tr("Error saving sketch metadata"), err)
+			os.Exit(errorcodes.ErrGeneric)
+		}
+		msg := fmt.Sprintf("%s: %s", tr("Default FQBN set to"), fqbn)
 		feedback.Print(msg)
 	}
-	if err := sk.ExportMetadata(); err != nil {
-		feedback.Errorf("%s: %s", tr("Error saving sketch metadata"), err)
-		os.Exit(errorcodes.ErrGeneric)
-	}
 }