package main import ( "flag" "fmt" "io" "io/ioutil" "os" "gopkg.in/yaml.v2" ) type empty struct{} func errorf(format string, args ...interface{}) { format += "\n" fmt.Fprintf(os.Stderr, format, args...) } func usage(w io.Writer) { fmt.Fprintf(w, `Usage: yamll [-hq] files... For each file, yamll will make sure it is a well-formatted YAML file. Unless the -q option is passed, yamll will print the names of each file and whether it was well-formed. With the -q option, only malformed files are printed. `) } func init() { flag.Usage = func() { usage(os.Stderr); os.Exit(1) } } func main() { help := flag.Bool("h", false, "Print program usage.") quiet := flag.Bool("q", false, "Quiet mode - don't note well-formed files, only malformed ones.") flag.Parse() if *help { usage(os.Stdout) os.Exit(0) } for _, path := range flag.Args() { in, err := ioutil.ReadFile(path) if err != nil { errorf("%s FAILED: %s", path, err) continue } var e empty err = yaml.Unmarshal(in, &e) if err != nil { errorf("%s FAILED: %s", path, err) continue } if !*quiet { fmt.Printf("%s: OK\n", path) } } }