From 72929d5636375bb464dfaec0e335e70e177ed2cb Mon Sep 17 00:00:00 2001
From: Reya C <reya.gitea@reya.zone>
Date: Sat, 3 Apr 2021 03:04:47 -0400
Subject: [PATCH] Serialize everything

---
 drive-demuxer.go | 81 ++++++++++++++----------------------------------
 1 file changed, 24 insertions(+), 57 deletions(-)

diff --git a/drive-demuxer.go b/drive-demuxer.go
index a059a5b..76361c8 100644
--- a/drive-demuxer.go
+++ b/drive-demuxer.go
@@ -3,25 +3,21 @@ package main
 import (
 	"bytes"
 	"flag"
+	"github.com/cheggaaa/pb/v3"
 	"io"
 	"log"
 	"os"
 	"path"
-	"sync"
-
-	"github.com/cheggaaa/pb/v3"
 )
 
 type TopLevel struct {
-	LeftInput       string
-	RightInput      string
-	LeftOutput      string
-	CombinedOutput  string
-	RightOutput     string
-	OpenHandles     chan int
-	OpenDirectories chan int
-	DryRun          bool
-	Bar             *pb.ProgressBar
+	LeftInput      string
+	RightInput     string
+	LeftOutput     string
+	CombinedOutput string
+	RightOutput    string
+	DryRun         bool
+	Bar            *pb.ProgressBar
 }
 
 type Step struct {
@@ -191,10 +187,6 @@ func (s *Step) RemoveInputDirs(child string) {
 }
 
 func (s *Step) ListChildren() []string {
-	s.OpenHandles <- 1
-	defer func() {
-		<-s.OpenHandles
-	}()
 	leftInPath := s.InputPath("", LEFT)
 	rightInPath := s.InputPath("", RIGHT)
 	results := make(map[string]bool)
@@ -220,10 +212,6 @@ func (s *Step) ListChildren() []string {
 }
 
 func (s *Step) AreFilesIdentical(child string) bool {
-	s.OpenHandles <- 1
-	defer func() {
-		<-s.OpenHandles
-	}()
 	leftInPath := s.InputPath(child, LEFT)
 	rightInPath := s.InputPath(child, RIGHT)
 	leftInfo, err := os.Stat(leftInPath)
@@ -290,8 +278,6 @@ func (s *Step) AreFilesIdentical(child string) bool {
 }
 
 func (s *Step) Walk() {
-	wg := sync.WaitGroup{}
-
 	children := s.ListChildren()
 	s.Bar.AddTotal(int64(len(children)))
 	for _, child := range children {
@@ -330,43 +316,28 @@ func (s *Step) Walk() {
 		switch rightState {
 		case FILE:
 			if leftState == FILE {
-				wg.Add(1)
-				go func(child string) {
-					defer func() {
-						wg.Done()
-					}()
-					if s.AreFilesIdentical(child) {
-						s.Combine(child)
-						s.Bar.Increment()
-					} else {
-						s.Separate(child)
-						s.Bar.Increment()
-					}
-				}(child)
+				if s.AreFilesIdentical(child) {
+					s.Combine(child)
+					s.Bar.Increment()
+				} else {
+					s.Separate(child)
+					s.Bar.Increment()
+				}
 			} else {
 				s.Separate(child)
 				s.Bar.Increment()
 			}
 		case DIRECTORY:
 			if leftState == DIRECTORY {
-				s.OpenDirectories <- 1
-				wg.Add(1)
-				go func(child string) {
-					defer func() {
-						wg.Done()
-						<-s.OpenDirectories
-					}()
-					substep := Step{
-						TopLevel: s.TopLevel,
-						Subpath:  path.Join(s.Subpath, child),
-					}
-					s.MakeCombinedDir(child)
-					substep.Walk()
-					s.RemoveInputDirs(child)
-					s.Bar.Increment()
-				}(child)
+				substep := Step{
+					TopLevel: s.TopLevel,
+					Subpath:  path.Join(s.Subpath, child),
+				}
+				s.MakeCombinedDir(child)
+				substep.Walk()
+				s.RemoveInputDirs(child)
+				s.Bar.Increment()
 			} else {
-				wg.Add(1)
 				s.Separate(child)
 				s.Bar.Increment()
 			}
@@ -374,15 +345,11 @@ func (s *Step) Walk() {
 			panic("Unexpected state")
 		}
 	}
-
-	wg.Wait()
 }
 
 func main() {
 	settings := TopLevel{
-		OpenHandles:     make(chan int, 450),
-		OpenDirectories: make(chan int, 1000),
-		Bar:             pb.StartNew(1),
+		Bar: pb.StartNew(1),
 	}
 	flag.StringVar(&settings.LeftInput,
 		"left-input", "./input/left", "The name of the left side of the input.")