package vfs

import (
    "path"
    "path/filepath"

    "pkg.jfrech.com/brief/internal/crumbs"
)

// [2023-12-09, jfrech] TODO implement
func Sub(fsys FS, name string, allowsymlinks bool) FS {
    name = crumbs.Clean(name)
    name = path.Join("/", name)[1:]
    if name == "" {
        name = "."
    }

    //

    if name == "." {
        return fsys
    }

    if fsys, ok := fsys.(*dirfs); ok {
        allowsymlinks = fsys.allowsymlinks && allowsymlinks
        return &dirfs{
            root: filepath.Join(fsys.root, filepath.FromSlash(name)),
            allowsymlinks: allowsymlinks,
        }
    }

    panic("not yet implemented")
}