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path: root/progress.go
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package main

import (
	"context"
	"fmt"
	"strings"
	"time"
)

/*
__________..........__________..........__________..........__________..........
Directory does not contain SHA256.sig. Continue without verification? [no] yes
Installing xshare58.tgz 100% |********************......|  4358 KB    00:12 ETA
Work                    100% |**********************....|             25m0s ETA
*/

func progress(current, max time.Duration) string {
	if current > max {
		current = max
	}
	width := time.Duration(40)
	n := width * current / max
	done := strings.Repeat("*", int(n))
	left := strings.Repeat(".", int(width-n))
	return fmt.Sprintf("%3d%% |%v%v| %6s/%-6s",
		100*current/max, done, left,
		current-current%time.Second, max-max%time.Second)
}

func count(ctx context.Context, s string, d time.Duration) {
	ctx, _ = context.WithTimeout(ctx, d)
	start := time.Now()
	defer fmt.Print("\n")
	ticker := time.NewTicker(time.Second)
	defer ticker.Stop()
	for t := range ticker.C {
		fmt.Printf("\r%-16s %v", s, progress(t.Sub(start), d))
		select {
		case <-ctx.Done():
			return
		default:
		}
	}
}