package scriptx

import (
	"bytes"
	"io"
)

// Buffer will read the contents of the source in an internal buffer until an EOF is encountered.
// It will then write the entire contents of the buffer to the writer. Useful when reading and
// writing to the same file.
func Buffer() func(r io.Reader, w io.Writer) error {
	return func(r io.Reader, w io.Writer) error {
		var bfr bytes.Buffer
		if _, err := io.Copy(&bfr, r); err != nil {
			return err
		}
		if _, err := io.Copy(w, &bfr); err != nil {
			return err
		}
		return nil
	}
}