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121 lines
4.2 KiB
Markdown
121 lines
4.2 KiB
Markdown
# Multi Progress Bar
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[](https://pkg.go.dev/github.com/vbauerster/mpb/v7)
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[](https://travis-ci.org/vbauerster/mpb)
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[](https://goreportcard.com/report/github.com/vbauerster/mpb)
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[](https://www.paypal.me/vbauerster)
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**mpb** is a Go lib for rendering progress bars in terminal applications.
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## Features
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- **Multiple Bars**: Multiple progress bars are supported
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- **Dynamic Total**: Set total while bar is running
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- **Dynamic Add/Remove**: Dynamically add or remove bars
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- **Cancellation**: Cancel whole rendering process
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- **Predefined Decorators**: Elapsed time, [ewma](https://github.com/VividCortex/ewma) based ETA, Percentage, Bytes counter
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- **Decorator's width sync**: Synchronized decorator's width among multiple bars
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## Usage
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#### [Rendering single bar](_examples/singleBar/main.go)
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```go
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package main
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import (
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"math/rand"
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"time"
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"github.com/vbauerster/mpb/v7"
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"github.com/vbauerster/mpb/v7/decor"
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)
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func main() {
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// initialize progress container, with custom width
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p := mpb.New(mpb.WithWidth(64))
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total := 100
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name := "Single Bar:"
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// adding a single bar, which will inherit container's width
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bar := p.Add(int64(total),
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// progress bar filler with customized style
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mpb.NewBarFiller(mpb.BarStyle().Lbound("╢").Filler("▌").Tip("▌").Padding("░").Rbound("╟")),
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mpb.PrependDecorators(
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// display our name with one space on the right
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decor.Name(name, decor.WC{W: len(name) + 1, C: decor.DidentRight}),
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// replace ETA decorator with "done" message, OnComplete event
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decor.OnComplete(
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decor.AverageETA(decor.ET_STYLE_GO, decor.WC{W: 4}), "done",
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),
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),
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mpb.AppendDecorators(decor.Percentage()),
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)
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// simulating some work
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max := 100 * time.Millisecond
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for i := 0; i < total; i++ {
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time.Sleep(time.Duration(rand.Intn(10)+1) * max / 10)
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bar.Increment()
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}
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// wait for our bar to complete and flush
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p.Wait()
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}
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```
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#### [Rendering multiple bars](_examples/multiBars/main.go)
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```go
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var wg sync.WaitGroup
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// passed &wg will be accounted at p.Wait() call
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p := mpb.New(mpb.WithWaitGroup(&wg))
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total, numBars := 100, 3
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wg.Add(numBars)
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for i := 0; i < numBars; i++ {
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name := fmt.Sprintf("Bar#%d:", i)
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bar := p.AddBar(int64(total),
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mpb.PrependDecorators(
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// simple name decorator
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decor.Name(name),
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// decor.DSyncWidth bit enables column width synchronization
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decor.Percentage(decor.WCSyncSpace),
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),
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mpb.AppendDecorators(
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// replace ETA decorator with "done" message, OnComplete event
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decor.OnComplete(
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// ETA decorator with ewma age of 60
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decor.EwmaETA(decor.ET_STYLE_GO, 60), "done",
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),
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),
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)
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// simulating some work
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go func() {
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defer wg.Done()
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rng := rand.New(rand.NewSource(time.Now().UnixNano()))
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max := 100 * time.Millisecond
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for i := 0; i < total; i++ {
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// start variable is solely for EWMA calculation
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// EWMA's unit of measure is an iteration's duration
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start := time.Now()
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time.Sleep(time.Duration(rng.Intn(10)+1) * max / 10)
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bar.Increment()
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// we need to call DecoratorEwmaUpdate to fulfill ewma decorator's contract
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bar.DecoratorEwmaUpdate(time.Since(start))
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}
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}()
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}
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// Waiting for passed &wg and for all bars to complete and flush
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p.Wait()
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```
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#### [Dynamic total](_examples/dynTotal/main.go)
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#### [Complex example](_examples/complex/main.go)
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#### [Bytes counters](_examples/io/main.go)
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