1 files changed, 150 insertions, 0 deletions
diff --git a/ccp.go b/ccp.go
new file mode 100644
index 0000000..2dc59c7
--- /dev/null
+++ b/ccp.go
@@ -0,0 +1,150 @@
+package main
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"time"
+
+	"github.com/charmbracelet/bubbles/progress"
+	tea "github.com/charmbracelet/bubbletea"
+	"gitlab.com/rhogenson/deque"
+)
+
+type measurement struct {
+	t time.Time
+	i int64
+}
+
+type model struct {
+	progress progress.Model
+
+	max          int64
+	measurements deque.Deque[measurement]
+}
+
+func (m *model) Init() tea.Cmd {
+	return nil
+}
+
+type (
+	progressMsg int
+	doneMsg     struct{}
+)
+
+func (m *model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.WindowSizeMsg:
+		m.progress.Width = msg.Width - 4
+		return m, nil
+	case progressMsg:
+		n := int64(msg)
+		if m.measurements.Len() > 0 {
+			n += m.measurements.At(m.measurements.Len() - 1).i
+		}
+		if m.measurements.Len() > 0 && m.measurements.At(m.measurements.Len()-1).i > n {
+			m.measurements.Reset()
+		}
+		now := time.Now()
+		for m.measurements.Len() > 2 && now.Sub(m.measurements.At(0).t) > 2*time.Minute {
+			m.measurements.PopFront()
+		}
+		m.measurements.PushBack(measurement{now, n})
+		return m, m.progress.SetPercent(float64(n) / float64(m.max))
+	case doneMsg:
+		return m, tea.Sequence(
+			m.progress.SetPercent(1),
+			tea.Tick(500*time.Millisecond, func(time.Time) tea.Msg { return nil }),
+			tea.Quit)
+	// FrameMsg is sent when the progress bar wants to animate itself
+	case progress.FrameMsg:
+		progressModel, cmd := m.progress.Update(msg)
+		m.progress = progressModel.(progress.Model)
+		return m, cmd
+	default:
+		return m, nil
+	}
+}
+
+func (m *model) View() string {
+	etaStr := "calculating..."
+	if m.measurements.Len() > 1 {
+		first := m.measurements.At(0)
+		last := m.measurements.At(m.measurements.Len() - 1)
+		deltaT := last.t.Sub(first.t)
+		delta := last.i - first.i
+		if delta != 0 {
+			etaStr = time.Duration(float64(m.max-last.i) / float64(delta) * float64(deltaT)).Round(time.Second).String()
+		}
+	}
+	return "\n" +
+		"  " + m.progress.View() + "\n" +
+		"  " + "ETA: " + etaStr + "\n"
+}
+
+func copy(out, in *os.File, progress func(int64)) error {
+	for {
+		n, err := io.CopyN(out, in, 1024*1024)
+		if n > 0 {
+			progress(n)
+		}
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+	}
+	if err := out.Close(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func run() error {
+	args := flag.Args()
+	if len(args) != 2 {
+		return errors.New("usage error")
+	}
+	in, err := os.Open(args[0])
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+	stat, err := in.Stat()
+	if err != nil {
+		return err
+	}
+	out, err := os.OpenFile(args[1], os.O_WRONLY|os.O_CREATE|os.O_TRUNC, stat.Mode().Perm())
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+	p := tea.NewProgram(&model{
+		progress: progress.New(progress.WithDefaultGradient(), progress.WithoutPercentage()),
+		max:      stat.Size() + 1,
+	}, tea.WithInput(nil), tea.WithOutput(os.Stderr))
+	var copyErr error
+	go func() {
+		if copyErr = copy(out, in, func(n int64) { p.Send(progressMsg(n)) }); copyErr != nil {
+			p.Send(tea.QuitMsg{})
+			return
+		}
+		p.Send(doneMsg{})
+	}()
+	_, teaErr := p.Run()
+	if copyErr != nil {
+		return copyErr
+	}
+	return teaErr
+}
+
+func main() {
+	flag.Parse()
+
+	if err := run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+	}
+}