Add IdentWriter

indent.go

@@ -0,0 +1,39 @@
+package gold
+
+import (
+	"io"
+	"strings"
+	"sync"
+)
+
+type IndentWriter struct {
+	Indent  uint
+	Forward io.Writer
+
+	initialWrite sync.Once
+}
+
+// Write is used to write more content to the reflow buffer.
+func (w *IndentWriter) Write(b []byte) (int, error) {
+	w.initialWrite.Do(func() {
+		w.Forward.Write([]byte(strings.Repeat(" ", int(w.Indent))))
+	})
+
+	for _, c := range string(b) {
+		w.Forward.Write([]byte{byte(c)})
+		if c == '\n' {
+			// end of current line
+			w.Forward.Write([]byte(strings.Repeat(" ", int(w.Indent))))
+		} else {
+			// any other character
+		}
+	}
+
+	return len(b), nil
+}
+
+// Close will finish the reflow operation. Always call it before trying to
+// retrieve the final result.
+func (w *IndentWriter) Close() error {
+	return nil
+}