// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package common
import (
"fmt"
"regexp"
"strings"
"time"
)
// PrettyDuration is a pretty printed version of a time.Duration value that cuts
// the unnecessary precision off from the formatted textual representation.
type PrettyDuration time.Duration
var prettyDurationRe = regexp.MustCompile(`\.[0-9]+`)
// String implements the Stringer interface, allowing pretty printing of duration
// values rounded to three decimals.
func (d PrettyDuration) String() string {
label := fmt.Sprintf("%v", time.Duration(d))
if match := prettyDurationRe.FindString(label); len(match) > 4 {
label = strings.Replace(label, match, match[:4], 1)
}
return label
}
// PrettyAge is a pretty printed version of a time.Duration value that rounds
// the values up to a single most significant unit, days/weeks/years included.
type PrettyAge time.Time
// ageUnits is a list of units the age pretty printing uses.
var ageUnits = []struct {
Size time.Duration
Symbol string
}{
{12 * 30 * 24 * time.Hour, "y"},
{30 * 24 * time.Hour, "mo"},
{7 * 24 * time.Hour, "w"},
{24 * time.Hour, "d"},
{time.Hour, "h"},
{time.Minute, "m"},
{time.Second, "s"},
}
// String implements the Stringer interface, allowing pretty printing of duration
// values rounded to the most significant time unit.
func (t PrettyAge) String() string {
// Calculate the time difference and handle the 0 cornercase
diff := time.Since(time.Time(t))
if diff < time.Second {
return "0"
}
// Accumulate a precision of 3 components before returning
result, prec := "", 0
for _, unit := range ageUnits {
if diff > unit.Size {
result = fmt.Sprintf("%s%d%s", result, diff/unit.Size, unit.Symbol)
diff %= unit.Size
if prec += 1; prec >= 3 {
break
}
}
}
return result
}
