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134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
// +build windows
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package godirwalk
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import (
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"fmt"
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"os"
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)
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// Scanner is an iterator to enumerate the contents of a directory.
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type Scanner struct {
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osDirname string
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childName string
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dh *os.File // dh is handle to open directory
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de *Dirent
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err error // err is the error associated with scanning directory
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childMode os.FileMode
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}
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// NewScanner returns a new directory Scanner that lazily enumerates the
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// contents of a single directory.
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//
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// scanner, err := godirwalk.NewScanner(dirname)
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// if err != nil {
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// fatal("cannot scan directory: %s", err)
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// }
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//
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// for scanner.Scan() {
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// dirent, err := scanner.Dirent()
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// if err != nil {
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// warning("cannot get dirent: %s", err)
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// continue
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// }
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// name := dirent.Name()
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// if name == "break" {
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// break
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// }
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// if name == "continue" {
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// continue
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// }
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// fmt.Printf("%v %v\n", dirent.ModeType(), dirent.Name())
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// }
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// if err := scanner.Err(); err != nil {
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// fatal("cannot scan directory: %s", err)
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// }
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func NewScanner(osDirname string) (*Scanner, error) {
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dh, err := os.Open(osDirname)
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if err != nil {
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return nil, err
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}
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scanner := &Scanner{
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osDirname: osDirname,
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dh: dh,
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}
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return scanner, nil
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}
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// NewScannerWithScratchBuffer returns a new directory Scanner that lazily
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// enumerates the contents of a single directory. On platforms other than
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// Windows it uses the provided scratch buffer to read from the file system. On
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// Windows the scratch buffer parameter is ignored.
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func NewScannerWithScratchBuffer(osDirname string, scratchBuffer []byte) (*Scanner, error) {
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return NewScanner(osDirname)
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}
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// Dirent returns the current directory entry while scanning a directory.
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func (s *Scanner) Dirent() (*Dirent, error) {
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if s.de == nil {
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s.de = &Dirent{
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name: s.childName,
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path: s.osDirname,
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modeType: s.childMode,
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}
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}
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return s.de, nil
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}
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// done is called when directory scanner unable to continue, with either the
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// triggering error, or nil when there are simply no more entries to read from
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// the directory.
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func (s *Scanner) done(err error) {
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if s.dh == nil {
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return
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}
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if cerr := s.dh.Close(); err == nil {
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s.err = cerr
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}
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s.childName, s.osDirname = "", ""
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s.de, s.dh = nil, nil
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}
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// Err returns any error associated with scanning a directory. It is normal to
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// call Err after Scan returns false, even though they both ensure Scanner
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// resources are released. Do not call until done scanning a directory.
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func (s *Scanner) Err() error {
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s.done(nil)
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return s.err
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}
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// Name returns the base name of the current directory entry while scanning a
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// directory.
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func (s *Scanner) Name() string { return s.childName }
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// Scan potentially reads and then decodes the next directory entry from the
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// file system.
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//
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// When it returns false, this releases resources used by the Scanner then
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// returns any error associated with closing the file system directory resource.
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func (s *Scanner) Scan() bool {
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if s.dh == nil {
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return false
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}
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s.de = nil
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fileinfos, err := s.dh.Readdir(1)
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if err != nil {
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s.done(err)
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return false
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}
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if l := len(fileinfos); l != 1 {
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s.done(fmt.Errorf("expected a single entry rather than %d", l))
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return false
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}
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fi := fileinfos[0]
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s.childMode = fi.Mode() & os.ModeType
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s.childName = fi.Name()
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return true
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}
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