LazyReadCloser provides an interface to a ReadCloser that will open on the first access.

LazyWriteCloser provides an interface to a WriteCloser that will open on the first access.

NewEmptySkipper creates an io.WriteCloser that will only start writing once a non-whitespace byte has been encountered.

NormalizeFileMode converts the given mode to a mode that will work as expected on the given OS.

SameSkipper creates an io.WriteCloser that will only start writing once a difference with the current output has been encountered.

NopCloser returns a WriteCloser with a no-op Close method wrapping the provided io.Writer.