show progress for delete operation

Related #238

app.go

@@ -179,7 +179,7 @@ func (app *app) loop() {
 				continue
 			}
 
-			if app.nav.deleting {
+			if app.nav.deleteTotal > 0 {
 				app.ui.echoerr("quit: delete operation in progress")
 				continue
 			}
@@ -237,6 +237,21 @@ func (app *app) loop() {
 				app.nav.moveUpdate = 0
 			}
 			app.ui.draw(app.nav)
+		case n := <-app.nav.deleteCountChan:
+			app.nav.deleteCount += n
+			if app.nav.deleteUpdate++; app.nav.deleteUpdate >= 1000 {
+				app.nav.deleteUpdate = 0
+				app.ui.draw(app.nav)
+			}
+		case n := <-app.nav.deleteTotalChan:
+			app.nav.deleteTotal += n
+			if n < 0 {
+				app.nav.deleteCount += n
+			}
+			if app.nav.deleteTotal == 0 {
+				app.nav.deleteUpdate = 0
+			}
+			app.ui.draw(app.nav)
 		case d := <-app.nav.dirChan:
 			prev, ok := app.nav.dirCache[d.path]
 			if ok {

nav.go

@@ -248,11 +248,15 @@ type nav struct {
 	moveCount       int
 	moveTotal       int
 	moveUpdate      int
-	deleting      bool
+	deleteCount     int
+	deleteTotal     int
+	deleteUpdate    int
 	copyBytesChan   chan int64
 	copyTotalChan   chan int64
 	moveCountChan   chan int
 	moveTotalChan   chan int
+	deleteCountChan chan int
+	deleteTotalChan chan int
 	dirChan         chan *dir
 	regChan         chan *reg
 	dirCache        map[string]*dir
@@ -340,6 +344,8 @@ func newNav(height int) *nav {
 		copyTotalChan:   make(chan int64, 1024),
 		moveCountChan:   make(chan int, 1024),
 		moveTotalChan:   make(chan int, 1024),
+		deleteCountChan: make(chan int, 1024),
+		deleteTotalChan: make(chan int, 1024),
 		dirChan:         make(chan *dir),
 		regChan:         make(chan *reg),
 		dirCache:        make(map[string]*dir),
@@ -785,21 +791,27 @@ func (nav *nav) del(ui *ui) error {
 	go func() {
 		echo := &callExpr{"echoerr", []string{""}, 1}
 		errCount := 0
-		nav.deleting = true
+
+		nav.deleteTotalChan <- len(list)
 
 		for _, path := range list {
+			nav.deleteCountChan <- 1
+
 			if err := os.RemoveAll(path); err != nil {
 				errCount++
 				echo.args[0] = fmt.Sprintf("[%d] %s", errCount, err)
 				ui.exprChan <- echo
 			}
 		}
-		nav.deleting = false
-	}()
 
-	if err := remote("send sync"); err != nil {
-		return fmt.Errorf("delete: %s", err)
+		nav.deleteTotalChan <- -len(list)
+
+		if err := remote("send load"); err != nil {
+			errCount++
+			echo.args[0] = fmt.Sprintf("[%d] %s", errCount, err)
+			ui.exprChan <- echo
 		}
+	}()
 
 	return nil
 }

ui.go

@@ -616,6 +616,10 @@ func (ui *ui) drawStatLine(nav *nav) {
 		progress += fmt.Sprintf("  [%d/%d]", nav.moveCount, nav.moveTotal)
 	}
 
+	if nav.deleteTotal > 0 {
+		progress += fmt.Sprintf("  [%d/%d]", nav.deleteCount, nav.deleteTotal)
+	}
+
 	ruler := fmt.Sprintf("%s%s  %d/%d", acc, progress, ind, tot)
 
 	ui.msgWin.printRight(0, fg, bg, ruler)