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- // 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
- }
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