print each time

pipeline_tree_spreader.go

@@ -44,23 +44,19 @@ func (ds *defaultSpreaderPipeline) spread(ctx context.Context, w io.Writer, root
 			close(errc)
 		}()
 
-		bw := bufio.NewWriter(w)
+		ds.w = w
 		wg := &sync.WaitGroup{}
 		for i := 0; i < workerSpreadNum; i++ {
 			wg.Add(1)
-			go ds.worker(ctx, wg, bw, roots, errc)
+			go ds.worker(ctx, wg, roots, errc)
 		}
 		wg.Wait()
-
-		if err := bw.Flush(); err != nil {
-			errc <- err
-		}
 	}()
 
 	return errc
 }
 
-func (ds *defaultSpreaderPipeline) worker(ctx context.Context, wg *sync.WaitGroup, bw *bufio.Writer, roots <-chan *Node, errc chan<- error) {
+func (ds *defaultSpreaderPipeline) worker(ctx context.Context, wg *sync.WaitGroup, roots <-chan *Node, _ chan<- error) {
 	defer wg.Done()
 	for {
 		select {
@@ -70,15 +66,10 @@ func (ds *defaultSpreaderPipeline) worker(ctx context.Context, wg *sync.WaitGrou
 			if !ok {
 				return
 			}
-			ret := ds.spreadBranch(root)
 
 			ds.Lock()
-			_, err := bw.WriteString(ret)
+			ds.spreadBranch(root)
 			ds.Unlock()
-
-			if err != nil {
-				errc <- err
-			}
 		}
 	}
 }

simple_tree_spreader.go

@@ -35,34 +35,28 @@ const (
 	encodeTOML
 )
 
-type defaultSpreaderSimple struct{}
+type defaultSpreaderSimple struct {
+	w io.Writer
+}
 
 func (ds *defaultSpreaderSimple) spread(w io.Writer, roots []*Node) error {
-	branches := ""
+	ds.w = w
 	for _, root := range roots {
-		branches += ds.spreadBranch(root)
+		ds.spreadBranch(root)
 	}
-	return ds.write(w, branches)
+	return nil
 }
 
-func (*defaultSpreaderSimple) spreadBranch(current *Node) string {
+func (ds *defaultSpreaderSimple) spreadBranch(current *Node) {
 	ret := current.name + "\n"
 	if !current.isRoot() {
 		ret = current.branch() + " " + current.name + "\n"
 	}
+	fmt.Fprint(ds.w, ret)
 
 	for _, child := range current.children {
-		ret += (*defaultSpreaderSimple)(nil).spreadBranch(child)
+		ds.spreadBranch(child)
 	}
-	return ret
-}
-
-func (*defaultSpreaderSimple) write(w io.Writer, in string) error {
-	buf := bufio.NewWriter(w)
-	if _, err := buf.WriteString(in); err != nil {
-		return err
-	}
-	return buf.Flush()
 }
 
 type formattedSpreaderSimple[T sitter] struct {
@@ -219,6 +213,14 @@ func (cs *colorizeSpreaderSimple) spreadBranch(current *Node) string {
 	return ret
 }
 
+func (*colorizeSpreaderSimple) write(w io.Writer, in string) error {
+	buf := bufio.NewWriter(w)
+	if _, err := buf.WriteString(in); err != nil {
+		return err
+	}
+	return buf.Flush()
+}
+
 func (cs *colorizeSpreaderSimple) colorize(current *Node) string {
 	if cs.fileConsiderer.isFile(current) {
 		_ = cs.fileCounter.next()