Clean up load logging, capture build output via slog, use cmake --build

cmd/picomap/main.go

@@ -204,25 +204,28 @@ func boardSerial(id [8]byte) string {
 		id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7])
 }
 
-func buildFirmware(buildDir string) error {
-	slog.Info("configuring")
-	cmake := exec.Command("cmake", "-S", filepath.Join(filepath.Dir(buildDir)), "-B", buildDir)
-	cmake.Stdout = os.Stdout
-	cmake.Stderr = os.Stderr
-	if err := cmake.Run(); err != nil {
-		return fmt.Errorf("cmake failed: %w", err)
+func runCmd(name string, args ...string) error {
+	cmd := exec.Command(name, args...)
+	out, err := cmd.CombinedOutput()
+	if len(out) > 0 {
+		for _, line := range strings.Split(strings.TrimSpace(string(out)), "\n") {
+			slog.Info(name, "msg", line)
+		}
 	}
-
-	slog.Info("building")
-	cmd := exec.Command("make", "-C", buildDir)
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-	if err := cmd.Run(); err != nil {
-		return fmt.Errorf("build failed: %w", err)
+	if err != nil {
+		return fmt.Errorf("%s failed: %w", name, err)
 	}
 	return nil
 }
 
+func buildFirmware(buildDir string) error {
+	srcDir := filepath.Dir(buildDir)
+	if err := runCmd("cmake", "-S", srcDir, "-B", buildDir); err != nil {
+		return err
+	}
+	return runCmd("cmake", "--build", buildDir)
+}
+
 func cmdLoad(args []string) error {
 	fs := flag.NewFlagSet("load", flag.ExitOnError)
 	tf := addTargetFlags(fs)
@@ -297,7 +300,7 @@ func cmdLoad(args []string) error {
 	errs := make([]error, len(devices))
 	var wg sync.WaitGroup
 	for i := range devices {
-		log := slog.With("serial", devices[i].serial)
+		log := slog.With("dev", devices[i].target.name, "serial", devices[i].serial)
 		wg.Go(func() {
 			log.Info("flashing", "uf2", devices[i].fw.name)
 			errs[i] = flashDevice(devices[i].target.client, devices[i].fw.uf2, *dryRun, log)