41 lines
976 B
Go
41 lines
976 B
Go
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package main
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import (
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"regexp"
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"strconv"
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"time"
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)
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// reTimeRange matches systemd.time-like short negative timeranges, e.g. "-200s".
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var reTimeRange = regexp.MustCompile(`^-\d{1,18}[s|m|h|d|w|M|y]$`)
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// secondsPer allows translating s(seconds), m(minutes), h(ours), d(ays),
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// w(eeks), M(onths) and y(ears) into corresponding seconds.
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var secondsPer = map[string]int64{
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"s": 1,
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"m": 60,
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"h": 3600,
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"d": 86400,
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"w": 604800,
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"M": 2630016, // 30.44 days
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"y": 31557600, // 365.25 days
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}
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// parseTime parses UNIX timestamps or short timeranges inspired by sytemd (when starting with "-"),
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// e.g. "-1M" for one month (30.44 days) ago.
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func parseTime(s string, base time.Time) (uint64, error) {
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if reTimeRange.MatchString(s) {
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last := len(s) - 1
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d, err := strconv.ParseInt(s[1:last], 10, 64)
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if err != nil {
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return uint64(0), err
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}
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mul := secondsPer[string(s[last])]
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return uint64(base.Unix() - d*mul), nil
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}
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return strconv.ParseUint(s, 10, 64)
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}
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