From 0c2cdf8e40cad131a65c38c77abb77e98513881d Mon Sep 17 00:00:00 2001
From: Adam Bozanich <adam.boz@gmail.com>
Date: Thu, 23 Feb 2017 22:34:59 -0800
Subject: [PATCH] remove ticker

---
 progress.go      | 64 +++++++++++++++++++++++++-----------------------
 progress_test.go |  6 +++--
 2 files changed, 38 insertions(+), 32 deletions(-)

diff --git a/progress.go b/progress.go
index 759a1a1..1caacd1 100644
--- a/progress.go
+++ b/progress.go
@@ -41,14 +41,18 @@ type Progress struct {
 
 // New returns a new progress bar with defaults
 func New() *Progress {
+	lw := uilive.New()
+	lw.Out = Out
+
 	return &Progress{
 		Width:           Width,
 		Out:             Out,
 		Bars:            make([]*Bar, 0),
 		RefreshInterval: RefreshInterval,
 
-		lw:  uilive.New(),
-		mtx: &sync.RWMutex{},
+		tdone: make(chan bool),
+		lw:    uilive.New(),
+		mtx:   &sync.RWMutex{},
 	}
 }
 
@@ -72,6 +76,20 @@ func Listen() {
 	defaultProgress.Listen()
 }
 
+func (p *Progress) SetOut(o io.Writer) {
+	p.mtx.Lock()
+	defer p.mtx.Unlock()
+
+	p.Out = o
+	p.lw.Out = o
+}
+
+func (p *Progress) SetRefreshInterval(interval time.Duration) {
+	p.mtx.Lock()
+	defer p.mtx.Unlock()
+	p.RefreshInterval = interval
+}
+
 // AddBar creates a new progress bar and adds to the container
 func (p *Progress) AddBar(total int) *Bar {
 	p.mtx.Lock()
@@ -85,55 +103,41 @@ func (p *Progress) AddBar(total int) *Bar {
 
 // Listen listens for updates and renders the progress bars
 func (p *Progress) Listen() {
-	var tickChan = p.ticker.C
-	p.lw.Out = p.Out
-
 	for {
-		select {
-		case <-tickChan:
-			p.mtx.RLock()
 
-			if p.ticker != nil {
-				p.print()
-				p.lw.Flush()
-			}
+		p.mtx.Lock()
+		interval := p.RefreshInterval
+		p.mtx.Unlock()
 
-			p.mtx.RUnlock()
+		select {
+		case <-time.After(interval):
+			p.print()
 		case <-p.tdone:
-			if p.ticker != nil {
-				p.ticker.Stop()
-				p.ticker = nil
-				return
-			}
+			p.print()
+			close(p.tdone)
+			return
 		}
 	}
 }
 
 func (p *Progress) print() {
+	p.mtx.Lock()
+	defer p.mtx.Unlock()
 	for _, bar := range p.Bars {
 		fmt.Fprintln(p.lw, bar.String())
 	}
+	p.lw.Flush()
 }
 
 // Start starts the rendering the progress of progress bars. It listens for updates using `bar.Set(n)` and new bars when added using `AddBar`
 func (p *Progress) Start() {
-	p.mtx.Lock()
-	if p.ticker == nil {
-		p.ticker = time.NewTicker(RefreshInterval)
-		p.tdone = make(chan bool, 1)
-	}
-	p.mtx.Unlock()
-
 	go p.Listen()
 }
 
 // Stop stops listening
 func (p *Progress) Stop() {
-	p.mtx.Lock()
-	close(p.tdone)
-	p.print()
-	p.lw.Flush()
-	p.mtx.Unlock()
+	p.tdone <- true
+	<-p.tdone
 }
 
 // Bypass returns a writer which allows non-buffered data to be written to the underlying output
diff --git a/progress_test.go b/progress_test.go
index d6a1b42..e631dd7 100644
--- a/progress_test.go
+++ b/progress_test.go
@@ -11,9 +11,11 @@ import (
 
 func TestStoppingPrintout(t *testing.T) {
 	progress := New()
-	progress.RefreshInterval = time.Millisecond * 10
+	progress.SetRefreshInterval(time.Millisecond * 10)
+
 	var buffer = &bytes.Buffer{}
-	progress.Out = buffer
+	progress.SetOut(buffer)
+
 	bar := progress.AddBar(100)
 	progress.Start()