goldsmith/file.go

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package goldsmith
import (
"bytes"
"io"
"io/ioutil"
"os"
"path"
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"path/filepath"
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"time"
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)
type file struct {
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path string
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Meta map[string]interface{}
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reader *bytes.Reader
size int64
modTime time.Time
asset string
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}
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func (f *file) export(dstDir string) error {
dstPath := filepath.Join(dstDir, f.path)
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if len(f.asset) > 0 {
dstInfo, err := os.Stat(dstPath)
if err == nil && dstInfo.ModTime().Unix() >= f.ModTime().Unix() {
return nil
}
}
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if err := os.MkdirAll(path.Dir(dstPath), 0755); err != nil {
return err
}
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fw, err := os.Create(dstPath)
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if err != nil {
return err
}
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defer fw.Close()
if f.reader == nil {
fr, err := os.Open(f.asset)
if err != nil {
return err
}
defer fr.Close()
if _, err := io.Copy(fw, fr); err != nil {
return err
}
} else {
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if _, err := f.Seek(0, os.SEEK_SET); err != nil {
return err
}
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if _, err := f.WriteTo(fw); err != nil {
return err
}
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}
return nil
}
func (f *file) cache() error {
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if f.reader != nil {
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return nil
}
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data, err := ioutil.ReadFile(f.asset)
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if err != nil {
return err
}
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f.reader = bytes.NewReader(data)
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return nil
}
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//
// File Implementation
//
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func (f *file) Path() string {
return f.path
}
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func (f *file) Name() string {
return path.Base(f.path)
}
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func (f *file) Dir() string {
return path.Dir(f.path)
}
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func (f *file) Ext() string {
return path.Ext(f.path)
}
func (f *file) Size() int64 {
return f.size
}
func (f *file) ModTime() time.Time {
return f.modTime
}
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func (f *file) Value(key string) (interface{}, bool) {
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return getDelimValue(f.Meta, key)
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}
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func (f *file) SetValue(key string, value interface{}) bool {
return setDelimValue(f.Meta, key, value)
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}
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func (f *file) InheritValues(src File) {
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rf := src.(*file)
for name, value := range rf.Meta {
f.SetValue(name, value)
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}
}
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func (f *file) Read(p []byte) (int, error) {
if err := f.cache(); err != nil {
return 0, err
}
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return f.reader.Read(p)
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}
func (f *file) WriteTo(w io.Writer) (int64, error) {
if err := f.cache(); err != nil {
return 0, err
}
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return f.reader.WriteTo(w)
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}
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func (f *file) Seek(offset int64, whence int) (int64, error) {
if f.reader == nil && offset == 0 && (whence == os.SEEK_SET || whence == os.SEEK_CUR) {
return 0, nil
}
if err := f.cache(); err != nil {
return 0, err
}
return f.reader.Seek(offset, whence)
}