mirror of https://github.com/dirtbags/moth.git
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
package namesubfs
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import (
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"io/fs"
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"log"
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"path"
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)
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// Sub returns a NameSubFS corresponding to the subtree rooted at fsys's dir.
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func NameSub(fsys fs.FS, dir string) (*NameSubFS, error) {
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switch f := fsys.(type) {
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case *NameSubFS:
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return f.NameSub(dir)
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default:
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baseFS := &NameSubFS{fsys, ""}
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return baseFS.NameSub(dir)
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}
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}
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// A NameSubFS is a file system allowing the query of the full path name of entries
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type NameSubFS struct {
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fs.FS
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dir string
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}
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// FullName returns the path to name.
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//
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// This is not the absolute path!
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// It is relative to whatever was provided to the initial Sub call.
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func (f *NameSubFS) FullName(name string) string {
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return path.Join(f.dir, name)
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}
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// NameSub returns a NameSubFS corresponding to the subtree rooted at dir.
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func (f *NameSubFS) NameSub(dir string) (*NameSubFS, error) {
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log.Println("Sub", f.dir)
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newFS, err := fs.Sub(f.FS, dir)
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if err != nil {
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return nil, err
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}
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newNameSubFS := NameSubFS{
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FS: newFS,
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dir: f.FullName(dir),
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}
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return &newNameSubFS, err
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}
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// NameSub returns an FS corresponding to the subtree rooted at dir.
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func (f *NameSubFS) Sub(dir string) (fs.FS, error) {
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return f.NameSub(dir)
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}
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