Add --libraries flag to compile command (arduino#436)

Author: duccio

cli/compile/compile.go

@@ -47,6 +47,7 @@ var (
 	port               string   // Upload port, e.g.: COM10 or /dev/ttyACM0.
 	verify             bool     // Upload, verify uploaded binary after the upload.
 	exportFile         string   // The compiled binary is written to this file
+	libraries          []string // List of custom libraries paths separated by commas. Or can be used multiple times for multiple libraries paths.
 )
 
 // NewCommand created a new `compile` command
@@ -77,6 +78,8 @@ func NewCommand() *cobra.Command {
 	command.Flags().StringVarP(&port, "port", "p", "", "Upload port, e.g.: COM10 or /dev/ttyACM0")
 	command.Flags().BoolVarP(&verify, "verify", "t", false, "Verify uploaded binary after the upload.")
 	command.Flags().StringVar(&vidPid, "vid-pid", "", "When specified, VID/PID specific build properties are used, if boards supports them.")
+	command.Flags().StringSliceVar(&libraries, "libraries", []string{},
+		"List of custom libraries paths separated by commas. Or can be used multiple times for multiple libraries paths.")
 
 	return command
 }
@@ -109,6 +112,7 @@ func run(cmd *cobra.Command, args []string) {
 		Quiet:           quiet,
 		VidPid:          vidPid,
 		ExportFile:      exportFile,
+		Libraries:       libraries,
 	}, os.Stdout, os.Stderr, viper.GetString("logging.level") == "debug")
 
 	if err != nil {

commands/compile/compile.go

@@ -90,7 +90,7 @@ func Compile(ctx context.Context, req *rpc.CompileReq, outStream, errStream io.W
 	builderCtx.HardwareDirs = configuration.HardwareDirectories()
 	builderCtx.BuiltInToolsDirs = configuration.BundleToolsDirectories()
 
-	builderCtx.OtherLibrariesDirs = paths.NewPathList()
+	builderCtx.OtherLibrariesDirs = paths.NewPathList(req.GetLibraries()...)
 	builderCtx.OtherLibrariesDirs.Add(configuration.LibrariesDir())
 
 	if req.GetBuildPath() != "" {

rpc/commands/compile.pb.go

@@ -36,6 +36,7 @@ message CompileReq {
   string vidPid = 12;   // VID/PID specific build properties.
   string exportFile = 13;   // The compiled binary is written to this file
   int32 jobs = 14;   // The max number of concurrent compiler instances to run (as make -jx)
+  repeated string libraries = 15; // List of custom libraries paths separated by commas. Or can be used multiple times for multiple libraries paths.
 }
 
 message CompileResp {