Transfer command refactoring

Make transfer command processing even more modular

internal/cli/progress.go

@@ -0,0 +1,79 @@
+/*
+Copyright © 2023 Philipp Wolfer <phw@uploadedlobster.com>
+
+This file is part of Scotty.
+
+Scotty is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later version.
+
+Scotty is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+Scotty. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+package cli
+
+import (
+	"sync"
+	"time"
+
+	"github.com/fatih/color"
+	"github.com/vbauerster/mpb/v8"
+	"github.com/vbauerster/mpb/v8/decor"
+	"go.uploadedlobster.com/scotty/internal/models"
+)
+
+func progressBar(wg *sync.WaitGroup, exportProgress chan models.Progress, importProgress chan models.Progress) *mpb.Progress {
+	p := mpb.New(
+		mpb.WithWaitGroup(wg),
+		mpb.WithOutput(color.Output),
+		// mpb.WithWidth(64),
+		mpb.WithAutoRefresh(),
+	)
+
+	exportBar := setupProgressBar(p, "exporting")
+	importBar := setupProgressBar(p, "importing")
+	go updateProgressBar(exportBar, wg, exportProgress)
+	go updateProgressBar(importBar, wg, importProgress)
+
+	return p
+}
+
+func setupProgressBar(p *mpb.Progress, name string) *mpb.Bar {
+	green := color.New(color.FgGreen).SprintFunc()
+	return p.New(0,
+		mpb.BarStyle(),
+		mpb.PrependDecorators(
+			decor.Name(" "),
+			decor.OnComplete(
+				decor.Spinner(nil, decor.WC{W: 2, C: decor.DidentRight}),
+				green("✓ "),
+			),
+			decor.Name(name, decor.WCSyncWidthR),
+		),
+		mpb.AppendDecorators(
+			decor.OnComplete(
+				decor.EwmaETA(decor.ET_STYLE_GO, 0, decor.WC{C: decor.DSyncWidth}),
+				"done",
+			),
+			// decor.OnComplete(decor.Percentage(decor.WC{W: 5, C: decor.DSyncWidthR}), "done"),
+			decor.Name(" "),
+		),
+	)
+}
+
+func updateProgressBar(bar *mpb.Bar, wg *sync.WaitGroup, progressChan chan models.Progress) {
+	wg.Add(1)
+	defer wg.Done()
+	lastIterTime := time.Now()
+	for progress := range progressChan {
+		oldIterTime := lastIterTime
+		lastIterTime = time.Now()
+		bar.EwmaSetCurrent(progress.Elapsed, lastIterTime.Sub(oldIterTime))
+		bar.SetTotal(progress.Total, progress.Completed)
+	}
+}