Added buffer

buffer.go

@@ -0,0 +1,22 @@
+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
+	}
+}