在Go(golang)中展示進度條：MultiBar

在Go(golang)中展示進度條：MultiBar。

$ go run main.go
here we have a progress bar

some work  30% [====================>-------------------------------------------] 925ms
and here we have another progress bar
here we have a longer prepend string  25% [==========>--------------------------] 911ms
working...  19% [=============>-------------------------------------------------] 911ms</code></pre> 
Display Options:

When you call .MakeBar(total int, prepend string), the returned progress bar has options that you can change to fit your needs. Here are the defaults:
- Width:           screen width - len(prepend) - 20
- Total:           total (passed in)
- Prepend:         prepend (passed in)
- LeftEnd:         '['
- RightEnd:        ']'
- Fill:            '='
- Head:            '>'
- Empty:           '-'
- ShowPercent:     true
- ShowTimeElapsed: true
 
Example usage:

(note, in the example gif, we are manually resetting the terminal mode. We NO LONGER have to, issue fixed)
    package main

    import (
        "fmt"
        "sync"
        "time"

        "github.com/sethgrid/multibar"
    )

    func main() {
        // create the multibar container
        // this allows our bars to work together without stomping on one another
        progressBars, _ := multibar.New()

        // some arbitrary totals for our  progress bars
        // in practice, these could be file sizes or similar
        mediumTotal, smallTotal, largerTotal := 150, 100, 200

        // make some output for the screen
        // the MakeBar(total, prependString) returns a method that you can pass progress into
        progressBars.Println("Below are many progress bars.")
        progressBars.Println("It is best to use the print wrappers to keep output synced up.")
        progressBars.Println("We can switch back to normal fmt after our progress bars are done.\n")

        // we will update the progress down below in the mock work section with barProgress1(int)
        barProgress1 := progressBars.MakeBar(mediumTotal, "1st")

        progressBars.Println()
        progressBars.Println("We can separate bars with blocks of text, or have them grouped.\n")

        barProgress2 := progressBars.MakeBar(smallTotal, "2nd - with description:")
        barProgress3 := progressBars.MakeBar(largerTotal, "3rd")
        barProgress4 := progressBars.MakeBar(mediumTotal, "4th")
        barProgress5 := progressBars.MakeBar(smallTotal, "5th")
        barProgress6 := progressBars.MakeBar(largerTotal, "6th")

        progressBars.Println("And we can have blocks of text as we wait for progress bars to complete...")

        // listen in for changes on the progress bars
        // I should be able to move this into the constructor at some point
        go progressBars.Listen()

        /*

            *** mock work ***
            spawn some goroutines to do arbitrary work, updating their
            respective progress bars as they see fit

        */
        wg := &sync.WaitGroup{}
        wg.Add(6)
        go func() {
            // do something asyn that we can get updates upon
            // every time an update comes in, tell the bar to re-draw
            // this could be based on transferred bytes or similar
            for i := 0; i <= mediumTotal; i++ {
                barProgress1(i)
                time.Sleep(time.Millisecond * 15)
            }
            wg.Done()
        }()

        go func() {
            for i := 0; i <= smallTotal; i++ {
                barProgress2(i)
                time.Sleep(time.Millisecond * 25)
            }
            wg.Done()
        }()

        go func() {
            for i := 0; i <= largerTotal; i++ {
                barProgress3(i)
                time.Sleep(time.Millisecond * 12)
            }
            wg.Done()
        }()

        go func() {
            for i := 0; i <= mediumTotal; i++ {
                barProgress4(i)
                time.Sleep(time.Millisecond * 10)
            }
            wg.Done()
        }()
        go func() {
            for i := 0; i <= smallTotal; i++ {
                barProgress5(i)
                time.Sleep(time.Millisecond * 20)
            }
            wg.Done()
        }()
        go func() {
            for i := 0; i <= largerTotal; i++ {
                barProgress6(i)
                time.Sleep(time.Millisecond * 10)
            }
            wg.Done()
        }()
        wg.Wait()

        // continue doing other work
        fmt.Println("All Bars Complete")
    }
 
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