func Filetype()

in tools/filetype.go [28:90]
47 lines of code
12 McCabe index (conditional complexity)

func Filetype() error {
	flag.Usage = printFiletypeHelp

	// Define command line flags
	helpFlag := flag.Bool("h", false, "Print help message")
	extensionFlag := flag.Bool("e", false, "Show file standard extension")
	mimeFlag := flag.Bool("m", false, "Show file mime type")

	// Parse command line flags
	flag.Parse()

	// Print help message if -h flag is provided
	if *helpFlag {
		flag.Usage()
		return nil
	}

	// Get the file path from the remaining command line arguments
	files := flag.Args()
	if len(files) != 1 {
		flag.Usage()
		return nil
	}

	file := files[0]
	fileContent, err := os.ReadFile(file)
	if err != nil {
		return err
	}

	kind, err := filetype.Match(fileContent)
	if err != nil {
		return err
	}

	var extension string
	if kind == filetype.Unknown {
		extension = "bin"
	} else {
		extension = kind.Extension
	}

	var mime string
	if kind == filetype.Unknown {
		mime = "applications/octet-stream"
	} else {
		mime = kind.MIME.Value
	}

	// if both flags missing or both present, print ext and mime
	if (!*extensionFlag && !*mimeFlag) || (*extensionFlag && *mimeFlag) {
		fmt.Println(extension, mime)
		return nil
	}

	if *extensionFlag {
		fmt.Println(extension)
	} else {
		fmt.Println(mime)
	}

	return nil
}