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c4b2486b7c
This adds two implementations of the new `FS` interface: One for the local file system (`Local`) and one for a single file read from an `io.Reader` (`Reader`).
97 lines
3.0 KiB
Go
97 lines
3.0 KiB
Go
package fs
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import (
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"os"
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"path/filepath"
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)
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// Local is the local file system. Most methods are just passed on to the stdlib.
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type Local struct{}
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// statically ensure that Local implements FS.
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var _ FS = &Local{}
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// VolumeName returns leading volume name. Given "C:\foo\bar" it returns "C:"
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// on Windows. Given "\\host\share\foo" it returns "\\host\share". On other
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// platforms it returns "".
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func (fs Local) VolumeName(path string) string {
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return filepath.VolumeName(path)
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}
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// Open opens a file for reading.
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func (fs Local) Open(name string) (File, error) {
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f, err := os.Open(fixpath(name))
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if err != nil {
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return nil, err
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}
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return f, nil
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}
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// OpenFile is the generalized open call; most users will use Open
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// or Create instead. It opens the named file with specified flag
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// (O_RDONLY etc.) and perm, (0666 etc.) if applicable. If successful,
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// methods on the returned File can be used for I/O.
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// If there is an error, it will be of type *PathError.
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func (fs Local) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
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f, err := os.OpenFile(fixpath(name), flag, perm)
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if err != nil {
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return nil, err
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}
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return f, nil
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}
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// Stat returns a FileInfo describing the named file. If there is an error, it
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// will be of type *PathError.
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func (fs Local) Stat(name string) (os.FileInfo, error) {
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return os.Stat(fixpath(name))
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}
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// Lstat returns the FileInfo structure describing the named file.
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// If the file is a symbolic link, the returned FileInfo
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// describes the symbolic link. Lstat makes no attempt to follow the link.
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// If there is an error, it will be of type *PathError.
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func (fs Local) Lstat(name string) (os.FileInfo, error) {
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return os.Lstat(fixpath(name))
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}
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// Join joins any number of path elements into a single path, adding a
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// Separator if necessary. Join calls Clean on the result; in particular, all
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// empty strings are ignored. On Windows, the result is a UNC path if and only
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// if the first path element is a UNC path.
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func (fs Local) Join(elem ...string) string {
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return filepath.Join(elem...)
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}
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// Separator returns the OS and FS dependent separator for dirs/subdirs/files.
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func (fs Local) Separator() string {
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return string(filepath.Separator)
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}
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// IsAbs reports whether the path is absolute.
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func (fs Local) IsAbs(path string) bool {
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return filepath.IsAbs(path)
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}
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// Abs returns an absolute representation of path. If the path is not absolute
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// it will be joined with the current working directory to turn it into an
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// absolute path. The absolute path name for a given file is not guaranteed to
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// be unique. Abs calls Clean on the result.
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func (fs Local) Abs(path string) (string, error) {
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return filepath.Abs(path)
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}
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// Clean returns the cleaned path. For details, see filepath.Clean.
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func (fs Local) Clean(p string) string {
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return filepath.Clean(p)
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}
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// Base returns the last element of path.
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func (fs Local) Base(path string) string {
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return filepath.Base(path)
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}
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// Dir returns path without the last element.
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func (fs Local) Dir(path string) string {
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return filepath.Dir(path)
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}
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