/
subfs.go
117 lines (91 loc) · 1.69 KB
/
subfs.go
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package golang
import (
"io/fs"
"path"
"time"
)
type subFS struct {
root string
f fs.FS
}
func getSubFS(f fs.FS, root string) fs.FS {
if s, ok := f.(fs.SubFS); ok {
s, err := s.Sub(root)
if err != nil {
return s
}
}
return newSubFS(f, root)
}
func newSubFS(f fs.FS, root string) fs.FS {
return subFS{
root: root,
f: f,
}
}
func (s subFS) Open(name string) (fs.File, error) {
if name == "." {
return rootFile{
s: s,
}, nil
}
return s.f.Open(path.Join(s.root, name))
}
type rootFile struct {
s subFS
}
func (r rootFile) Name() string {
return "."
}
func (r rootFile) Size() int64 {
return 0
}
func (r rootFile) Mode() fs.FileMode {
return fs.ModePerm
}
func (r rootFile) ModTime() time.Time {
return time.Now()
}
func (r rootFile) IsDir() bool {
return true
}
func (r rootFile) Sys() any {
return nil
}
func (r rootFile) ReadDir(_ int) ([]fs.DirEntry, error) {
return fs.ReadDir(r.s.f, r.s.root)
}
func (r rootFile) Stat() (fs.FileInfo, error) {
return r, nil
}
func (r rootFile) Read(_ []byte) (int, error) {
panic("not implemented")
}
func (r rootFile) Close() error {
return nil
}
var _ fs.File = (*rootFile)(nil)
var _ fs.ReadDirFile = (*rootFile)(nil)
var _ fs.FileInfo = (*rootFile)(nil)
type subFsFileInfo struct {
fi fs.FileInfo
}
func (s subFsFileInfo) Name() string {
return s.fi.Name()
}
func (s subFsFileInfo) Size() int64 {
return s.fi.Size()
}
func (s subFsFileInfo) Mode() fs.FileMode {
return s.fi.Mode()
}
func (s subFsFileInfo) ModTime() time.Time {
return s.fi.ModTime()
}
func (s subFsFileInfo) IsDir() bool {
return s.fi.IsDir()
}
func (s subFsFileInfo) Sys() any {
return s.fi.Sys()
}
var _ fs.FileInfo = (*subFsFileInfo)(nil)