package main

import (
	"fmt"
	"sync"
)

// https://programming.guide/go/formatting-byte-size-to-human-readable-format.html
func FormatByteCount(b uint64) string {
	const unit = 1024
	if b < unit {
		return fmt.Sprintf("%d B", b)
	} else {
		div, exp := int64(unit), 0
		for n := b / unit; n >= unit; n /= unit {
			div *= unit
			exp++
		}
		return fmt.Sprintf("%.1f %ciB", float64(b)/float64(div), "KMGTPE"[exp])
	}
}

type Hooks struct {
	m sync.Mutex
	l []func()
}

func (h *Hooks) Add(hook func()) {
	h.m.Lock()
	h.l = append(h.l, hook)
	h.m.Unlock()
}

func (h *Hooks) Execute() {
	for _, hook := range h.l {
		hook()
	}
}