peridot/vendor/github.com/vbauerster/mpb/v7/README.md

# Multi Progress Bar

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**mpb** is a Go lib for rendering progress bars in terminal applications.

## Features

- **Multiple Bars**: Multiple progress bars are supported
- **Dynamic Total**: Set total while bar is running
- **Dynamic Add/Remove**: Dynamically add or remove bars
- **Cancellation**: Cancel whole rendering process
- **Predefined Decorators**: Elapsed time, [ewma](https://github.com/VividCortex/ewma) based ETA, Percentage, Bytes counter
- **Decorator's width sync**: Synchronized decorator's width among multiple bars

## Usage

#### [Rendering single bar](_examples/singleBar/main.go)

```go
package main

import (
    "math/rand"
    "time"

    "github.com/vbauerster/mpb/v7"
    "github.com/vbauerster/mpb/v7/decor"
)

func main() {
    // initialize progress container, with custom width
    p := mpb.New(mpb.WithWidth(64))

    total := 100
    name := "Single Bar:"
    // adding a single bar, which will inherit container's width
    bar := p.Add(int64(total),
        // progress bar filler with customized style
        mpb.NewBarFiller(mpb.BarStyle().Lbound("╢").Filler("▌").Tip("▌").Padding("░").Rbound("╟")),
        mpb.PrependDecorators(
            // display our name with one space on the right
            decor.Name(name, decor.WC{W: len(name) + 1, C: decor.DidentRight}),
            // replace ETA decorator with "done" message, OnComplete event
            decor.OnComplete(
                decor.AverageETA(decor.ET_STYLE_GO, decor.WC{W: 4}), "done",
            ),
        ),
        mpb.AppendDecorators(decor.Percentage()),
    )
    // simulating some work
    max := 100 * time.Millisecond
    for i := 0; i < total; i++ {
        time.Sleep(time.Duration(rand.Intn(10)+1) * max / 10)
        bar.Increment()
    }
    // wait for our bar to complete and flush
    p.Wait()
}
```

#### [Rendering multiple bars](_examples/multiBars/main.go)

```go
    var wg sync.WaitGroup
    // passed &wg will be accounted at p.Wait() call
    p := mpb.New(mpb.WithWaitGroup(&wg))
    total, numBars := 100, 3
    wg.Add(numBars)

    for i := 0; i < numBars; i++ {
        name := fmt.Sprintf("Bar#%d:", i)
        bar := p.AddBar(int64(total),
            mpb.PrependDecorators(
                // simple name decorator
                decor.Name(name),
                // decor.DSyncWidth bit enables column width synchronization
                decor.Percentage(decor.WCSyncSpace),
            ),
            mpb.AppendDecorators(
                // replace ETA decorator with "done" message, OnComplete event
                decor.OnComplete(
                    // ETA decorator with ewma age of 60
                    decor.EwmaETA(decor.ET_STYLE_GO, 60), "done",
                ),
            ),
        )
        // simulating some work
        go func() {
            defer wg.Done()
            rng := rand.New(rand.NewSource(time.Now().UnixNano()))
            max := 100 * time.Millisecond
            for i := 0; i < total; i++ {
                // start variable is solely for EWMA calculation
                // EWMA's unit of measure is an iteration's duration
                start := time.Now()
                time.Sleep(time.Duration(rng.Intn(10)+1) * max / 10)
                bar.Increment()
                // we need to call DecoratorEwmaUpdate to fulfill ewma decorator's contract
                bar.DecoratorEwmaUpdate(time.Since(start))
            }
        }()
    }
    // Waiting for passed &wg and for all bars to complete and flush
    p.Wait()
```

#### [Dynamic total](_examples/dynTotal/main.go)

![dynamic total](_svg/godEMrCZmJkHYH1X9dN4Nm0U7.svg)

#### [Complex example](_examples/complex/main.go)

![complex](_svg/wHzf1M7sd7B3zVa2scBMnjqRf.svg)

#### [Bytes counters](_examples/io/main.go)

![byte counters](_svg/hIpTa3A5rQz65ssiVuRJu87X6.svg)