package walk
import (
"context"
"io/fs"
"os"
"path/filepath"
)
type filesystemWalker struct {
root string
paths []string
}
func (f filesystemWalker) Root() string {
return f.root
func (f filesystemWalker) Walk(_ context.Context, fn WalkFunc) error {
relPathOffset := len(f.root) + 1
relPathFn := func(path string) (relPath string) {
if len(path) >= relPathOffset {
relPath = path[relPathOffset:]
return
walkFn := func(path string, info fs.FileInfo, err error) error {
file := File{
Path: path,
RelPath: relPathFn(path),
Info: info,
return fn(&file, err)
if len(f.paths) == 0 {
return filepath.Walk(f.root, walkFn)
for _, path := range f.paths {
info, err := os.Stat(path)
if err = filepath.Walk(path, walkFn); err != nil {
return err
if err = fn(&file, err); err != nil {
return nil
func NewFilesystem(root string, paths []string) (Walker, error) {
return filesystemWalker{root, paths}, nil