package z

import (
  "fmt"
  "time"

  "github.com/shopspring/decimal"
)

var fractional bool

func fmtDuration(dur time.Duration) (string) {
  return fmtHours(decimal.NewFromFloat(dur.Hours()))
}

func fmtHours(hours decimal.Decimal) (string) {
  if fractional {
    return hours.StringFixed(2)
  } else {
    return fmt.Sprintf(
      "%s:%02s",
      hours.Floor(), // hours
      hours.Sub(hours.Floor()).
         Mul(decimal.NewFromFloat(.6)).
         Mul(decimal.NewFromInt(100)).
         Floor())
  }
}