progress.go

package gokit

import "fmt"

type Bar struct {
	percent int64  //百分比
	cur     int64  //当前进度位置
	total   int64  //总进度
	rate    string //进度条
	graph   string //显示符号
}

func (bar *Bar) NewOption(start, total int64) {
	bar.cur = start
	bar.total = total
	if bar.graph == "" {
		bar.graph = "█"
	}
	bar.percent = bar.getPercent()
	for i := 0; i < int(bar.percent); i += 2 {
		bar.rate += bar.graph //初始化进度条位置
	}
}

func (bar *Bar) getPercent() int64 {
	return int64(float32(bar.cur) / float32(bar.total) * 100)
}

func (bar *Bar) NewOptionWithGraph(start, total int64, graph string) {
	bar.graph = graph
	bar.NewOption(start, total)
}

func (bar *Bar) Play(cur int64) {
	bar.cur = cur
	last := bar.percent
	bar.percent = bar.getPercent()
	if bar.percent != last && bar.percent%2 == 0 {
		bar.rate += bar.graph
	}
	// \r 是返回行首，也叫回车，重新复写当前行
	// %d 十进制表示
	// %% 字面上得百分号
	// -50 在右侧而非左侧填充50个字符，100percent每2percent填充一次，填充50次
	fmt.Printf("\r[%-50s]%3d%%  %8d/%d", bar.rate, bar.percent, bar.cur, bar.total)
}

func (bar *Bar) Finish() {
	fmt.Println()
}