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Find file Copy path
Find file Copy path
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package assets
import (
const permissions = 0744
// File stores a filename and hash fingerprint for the asset file
type File struct {
name string
hash string
path string
bytes []byte
// NewFile returns a new file object
func NewFile(p string) (*File, error) {
// Load file from path to get bytes
bytes, err := ioutil.ReadFile(p)
if err != nil {
return &File{}, err
// Calculate hash and save it
file := &File{
path: p,
name: path.Base(p),
hash: bytesHash(bytes),
bytes: bytes,
return file, nil
// Style returns true if this file is a CSS file
func (f *File) Style() bool {
return strings.HasSuffix(, ".css")
// Script returns true if this file is a js file
func (f *File) Script() bool {
return strings.HasSuffix(, ".js")
// MarshalJSON generates json for this file, of the form {group:{file:hash}}
func (f *File) MarshalJSON() ([]byte, error) {
var b bytes.Buffer
s := fmt.Sprintf("\"%s\":\"%s\"", f.path, f.hash)
return b.Bytes(), nil
// Newer returns true if file exists at path
func (f *File) Newer(dst string) bool {
// Check mtimes
stat, err := os.Stat(f.path)
if err != nil {
return false
srcM := stat.ModTime()
stat, err = os.Stat(dst)
// If the file doesn't exist, return true
if os.IsNotExist(err) {
return true
// Else check for other errors
if err != nil {
return false
dstM := stat.ModTime()
return srcM.After(dstM)
// Copy our bytes to dstpath
func (f *File) Copy(dst string) error {
err := ioutil.WriteFile(dst, f.bytes, permissions)
if err != nil {
return err
return nil
// LocalPath returns the relative path of this file
func (f *File) LocalPath() string {
return f.path
// AssetPath returns the path of this file within the assets folder
func (f *File) AssetPath(dst string) string {
folder := "styles"
if f.Script() {
folder = "scripts"
return path.Join(dst, "assets", folder,
// String returns a string representation of this object
func (f *File) String() string {
return fmt.Sprintf("%s:%s",, f.hash)
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