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walk.go
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walk.go
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package valueobject
import (
"errors"
"fmt"
dfs "github.com/gohugonet/hugoverse/internal/domain/fs"
"github.com/gohugonet/hugoverse/pkg/loggers"
"github.com/gohugonet/hugoverse/pkg/overlayfs"
"github.com/spf13/afero"
"io/fs"
"os"
"path/filepath"
"strings"
)
type (
WalkFunc func(path string, info FileMetaInfo, err error) error
)
type Walkway struct {
Fs afero.Fs
Root string
basePath string
// May be pre-set
fi FileMetaInfo
dirEntries []FileMetaInfo
WalkFn WalkFunc
// We may traverse symbolic links and bite ourself.
Seen map[string]bool
// Some optional flags.
FailOnNotExist bool // If set, return an error if a directory is not found.
Log loggers.Logger
}
func NewWalkway(fs afero.Fs, root string, walker WalkFunc) *Walkway {
return &Walkway{
Fs: fs,
Root: root,
WalkFn: walker,
Seen: make(map[string]bool),
Log: loggers.NewDefault(),
}
}
func (w *Walkway) Walk() error {
var fi FileMetaInfo
if w.fi != nil {
fi = w.fi
} else {
info, _, err := LstatIfPossible(w.Fs, w.Root)
if err != nil {
if os.IsNotExist(err) {
return err
}
return w.WalkFn(w.Root, nil, fmt.Errorf("walk: %q: %w", w.Root, err))
}
fi = info.(FileMetaInfo)
}
if !fi.IsDir() {
return w.WalkFn(w.Root, nil, errors.New("file to walk must be a directory"))
}
return w.walk(w.Root, fi, w.dirEntries, w.WalkFn)
}
// walk recursively descends path, calling walkFn.
// It follows symlinks if supported by the filesystem, but only the same path once.
func (w *Walkway) walk(path string, info FileMetaInfo, dirEntries []FileMetaInfo, walkFn WalkFunc) error {
err := walkFn(path, info, nil)
if err != nil {
if info.IsDir() && errors.Is(err, filepath.SkipDir) {
return nil
}
return err
}
if !info.IsDir() {
return nil
}
meta := info.Meta()
filename := meta.Filename
if dirEntries == nil {
f, err := w.Fs.Open(path)
if err != nil {
if w.checkErr(path, err) {
return nil
}
return walkFn(path, info, fmt.Errorf("walk: open %q (%q): %w", path, w.Root, err))
}
fis, err := f.(fs.ReadDirFile).ReadDir(-1)
f.Close()
if err != nil {
if w.checkErr(filename, err) {
return nil
}
return walkFn(path, info, fmt.Errorf("walk: Readdir: %w", err))
}
dirEntries = DirEntriesToFileMetaInfos(fis)
//TODO PathInfo
}
// First add some metadata to the dir entries
for _, fi := range dirEntries {
fim := fi.(FileMetaInfo)
meta := fim.Meta()
// Note that we use the original TmplName even if it's a symlink.
name := meta.Name
if name == "" {
name = fim.Name()
}
if name == "" {
panic(fmt.Sprintf("[%s] no name set in %v", path, meta))
}
pathn := filepath.Join(path, name)
pathMeta := pathn
if w.basePath != "" {
pathMeta = strings.TrimPrefix(pathn, w.basePath)
}
meta.Path = normalizeFilename(pathMeta)
meta.PathWalk = pathn
if fim.IsDir() && meta.IsSymlink && w.isSeen(meta.Filename) {
// Prevent infinite recursion
// Possible cyclic reference
meta.SkipDir = true
}
}
for _, fi := range dirEntries {
fim := fi.(FileMetaInfo)
meta := fim.Meta()
if meta.SkipDir {
continue
}
err := w.walk(meta.PathWalk, fim, nil, walkFn)
if err != nil {
if !fi.IsDir() || !errors.Is(err, filepath.SkipDir) {
return err
}
}
}
return nil
}
func (w *Walkway) isSeen(filename string) bool {
if filename == "" {
return false
}
if w.Seen[filename] {
return true
}
w.Seen[filename] = true
return false
}
// checkErr returns true if the error is handled.
func (w *Walkway) checkErr(filename string, err error) bool {
if os.IsNotExist(err) && !w.FailOnNotExist {
// The file may be removed in process.
// This may be a ERROR situation, but it is not possible
// to determine as a general case.
fmt.Printf("File %q not found, skipping.", filename)
return true
}
return false
}
// WalkFn is the walk func for WalkFilesystems.
type WalkFn func(fs afero.Fs) bool
// WalkFilesystems walks fs recursively and calls fn.
// If fn returns true, walking is stopped.
func WalkFilesystems(fs afero.Fs, fn WalkFn) bool {
if fn(fs) {
return true
}
if afs, ok := fs.(dfs.FilesystemUnwrapper); ok {
if WalkFilesystems(afs.UnwrapFilesystem(), fn) {
return true
}
} else if bfs, ok := fs.(dfs.FilesystemsUnwrapper); ok {
for _, sf := range bfs.UnwrapFilesystems() {
if WalkFilesystems(sf, fn) {
return true
}
}
} else if cfs, ok := fs.(overlayfs.FilesystemIterator); ok {
for i := 0; i < cfs.NumFilesystems(); i++ {
if WalkFilesystems(cfs.Filesystem(i), fn) {
return true
}
}
}
return false
}