Give some more info in compiler json output

Author: cmaglie

cli/compile/compile.go

@@ -148,10 +148,11 @@ func run(cmd *cobra.Command, args []string) {
 	compileOut := new(bytes.Buffer)
 	compileErr := new(bytes.Buffer)
 	verboseCompile := configuration.Settings.GetString("logging.level") == "debug"
+	var compileRes *rpc.CompileResp
 	if output.OutputFormat == "json" {
-		_, err = compile.Compile(context.Background(), compileReq, compileOut, compileErr, verboseCompile)
+		compileRes, err = compile.Compile(context.Background(), compileReq, compileOut, compileErr, verboseCompile)
 	} else {
-		_, err = compile.Compile(context.Background(), compileReq, os.Stdout, os.Stderr, verboseCompile)
+		compileRes, err = compile.Compile(context.Background(), compileReq, os.Stdout, os.Stderr, verboseCompile)
 	}
 	if err != nil {
 		feedback.Errorf("Error during build: %v", err)
@@ -185,8 +186,9 @@ func run(cmd *cobra.Command, args []string) {
 	}
 
 	feedback.PrintResult(&compileResult{
-		CompileOut: compileOut.String(),
-		CompileErr: compileErr.String(),
+		CompileOut:    compileOut.String(),
+		CompileErr:    compileErr.String(),
+		BuilderResult: compileRes,
 	})
 }
 
@@ -206,8 +208,9 @@ func initSketchPath(sketchPath *paths.Path) *paths.Path {
 }
 
 type compileResult struct {
-	CompileOut string
-	CompileErr string
+	CompileOut    string           `json:"compiler_out"`
+	CompileErr    string           `json:"compiler_err"`
+	BuilderResult *rpc.CompileResp `json:"builder_result"`
 }
 
 func (r *compileResult) Data() interface{} {

commands/compile/compile.go

@@ -189,6 +189,20 @@ func Compile(ctx context.Context, req *rpc.CompileReq, outStream, errStream io.W
 	builderCtx.SetLogger(i18n.LoggerToCustomStreams{Stdout: outStream, Stderr: errStream})
 	builderCtx.Clean = req.GetClean()
 
+	// Use defer() to create an rpc.CompileResp with all the information available at the
+	// moment of return.
+	defer func() {
+		if r != nil {
+			importedLibs := []*rpc.Library{}
+			for _, lib := range builderCtx.ImportedLibraries {
+				importedLibs = append(importedLibs, lib.ToRPCLibrary())
+			}
+
+			r.BuildPath = builderCtx.BuildPath.String()
+			r.UsedLibraries = importedLibs
+		}
+	}()
+
 	// if --preprocess or --show-properties were passed, we can stop here
 	if req.GetShowProperties() {
 		return &rpc.CompileResp{}, builder.RunParseHardwareAndDumpBuildProperties(builderCtx)

rpc/commands/compile.pb.go

@@ -20,6 +20,7 @@ package cc.arduino.cli.commands;
 option go_package = "github.com/arduino/arduino-cli/rpc/commands";
 
 import "commands/common.proto";
+import "commands/lib.proto";
 
 message CompileReq {
   Instance instance = 1;  // Arduino Core Service instance from the `Init` response.
@@ -45,4 +46,6 @@ message CompileReq {
 message CompileResp {
   bytes out_stream = 1; // The output of the compilation process.
   bytes err_stream = 2; // The error output of the compilation process.
+  string build_path = 3; // The compiler build path
+  repeated Library used_libraries = 4; // The libraries used in the build
 }