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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)
}
}
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