scanner

type Block struct {
	Offset int64
	Size   uint32
	Hash   []byte
}

type CurrentFiler interface {
	// CurrentFile returns the file as seen at last scan.
	CurrentFile(name string) File
}

type File struct {
	Name       string
	Flags      uint32
	Modified   int64
	Version    uint64
	Size       int64
	Blocks     []Block
	Suppressed bool
}

type Suppressor interface {
	// Supress returns true if the update to the named file should be ignored.
	Suppress(name string, fi os.FileInfo) (bool, bool)
}

type TempNamer interface {
	// Temporary returns a temporary name for the filed referred to by filepath.
	TempName(path string) string
	// IsTemporary returns true if path refers to the name of temporary file.
	IsTemporary(path string) bool
}

type Walker struct {
	// Dir is the base directory for the walk
	Dir string
	// BlockSize controls the size of the block used when hashing.
	BlockSize int
	// If IgnoreFile is not empty, it is the name used for the file that holds ignore patterns.
	IgnoreFile string
	// If TempNamer is not nil, it is used to ignore tempory files when walking.
	TempNamer TempNamer
	// If CurrentFiler is not nil, it is queried for the current file before rescanning.
	CurrentFiler CurrentFiler
	// If Suppressor is not nil, it is queried for supression of modified files.
	// Suppressed files will be returned with empty metadata and the Suppressed flag set.
	// Requires CurrentFiler to be set.
	Suppressor Suppressor
	// If IgnorePerms is true, changes to permission bits will not be
	// detected. Scanned files will get zero permission bits and the
	// NoPermissionBits flag set.
	IgnorePerms bool
}