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