Feat: vformat supports multi-core processing (#996)

infra/vformat/main.go

@@ -77,31 +77,31 @@ func GetGOBIN() string {
 	return GOBIN
 }
 
-func Run(binary string, args []string) (string, error) {
+func Run(binary string, args []string) ([]byte, error) {
 	cmd := exec.Command(binary, args...)
 	cmd.Env = append(cmd.Env, os.Environ()...)
 	output, cmdErr := cmd.CombinedOutput()
 	if cmdErr != nil {
-		return "", cmdErr
+		return nil, cmdErr
 	}
-	if len(output) > 0 {
-		return string(output), nil
-	}
-	return "", nil
+	return output, nil
 }
 
 func RunMany(binary string, args, files []string) {
 	fmt.Println("Processing...")
+
+	maxTasks := make(chan struct{}, runtime.NumCPU())
 	for _, file := range files {
-		args := append(args, file)
-		output, err := Run(binary, args)
+		maxTasks <- struct{}{}
+		go func(file string) {
+			output, err := Run(binary, append(args, file))
 			if err != nil {
 				fmt.Println(err)
-			continue
-		}
-		if len(output) > 0 {
-			fmt.Println(output)
+			} else if len(output) > 0 {
+				fmt.Println(string(output))
 			}
+			<-maxTasks
+		}(file)
 	}
 }
 
@@ -139,7 +139,7 @@ func main() {
 		goimports = goimportsPath
 	}
 
-	rawFilesSlice := make([]string, 0)
+	rawFilesSlice := make([]string, 0, 1000)
 	walkErr := filepath.Walk("./", func(path string, info os.FileInfo, err error) error {
 		if err != nil {
 			fmt.Println(err)