96 lines
1.5 KiB
Go
96 lines
1.5 KiB
Go
package main
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import (
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e "codeberg.org/pebbe/errors"
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"fmt"
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"os"
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"strconv"
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"strings"
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"time"
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)
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var (
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x = e.ExitErr
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)
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func main() {
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aa := strings.Split(os.Args[1], "-")
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if len(aa) != 2 {
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x(fmt.Errorf("ongeldig argument, moet in formaat yyyy-dd zijn"))
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}
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year, err := strconv.Atoi(aa[0])
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x(err)
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week, err := strconv.Atoi(aa[1])
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x(err)
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if year < 1000 || year > 9999 {
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x(fmt.Errorf("ongeldig year: %d", year))
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}
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if week < 1 || week > 53 {
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x(fmt.Errorf("ongeldige week: %d", week))
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}
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// 15 januari van het jaar
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t := time.Date(year, 1, 15, 12, 0, 0, 0, time.UTC)
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// eerste gok
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t = t.AddDate(0, 0, 7*week-14)
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// zoek juiste week
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var y, w int
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for {
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y, w = t.ISOWeek()
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if y < year {
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t = t.AddDate(0, 12, 0)
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continue
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}
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if y > year {
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t = t.AddDate(0, -12, 0)
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continue
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}
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break
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}
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for {
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y, w = t.ISOWeek()
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if w < week {
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t = t.AddDate(0, 0, 7)
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continue
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}
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if w > week {
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t = t.AddDate(0, 0, -7)
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}
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break
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}
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if y != year {
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x(fmt.Errorf("ongeldige combinatie van week/jaar: %d/%d", week, year))
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}
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// zoek begin van de week
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d := int(t.Weekday())
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if d == 0 {
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d = 7
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}
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t = t.AddDate(0, 0, 1-d)
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// drie voorgaande weken
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t2 := t.AddDate(0, 0, -21)
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for i := range 4 {
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if i > 0 {
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fmt.Print(" -or")
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}
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y, w := t2.ISOWeek()
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fmt.Printf(" -name %d-%02d.data.dz", y, w)
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t2 = t2.AddDate(0, 0, 7)
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}
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// vanaf begin drie weken geleden t/m eind huidige week
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t = t.AddDate(0, 0, -21)
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for range 28 {
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fmt.Printf(" -or -name %d-%02d-%02d.data.dz", t.Year(), t.Month(), t.Day())
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t = t.AddDate(0, 0, 1)
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}
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}
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