collect.sh

cmd/week2files/week2files.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	e "codeberg.org/pebbe/errors"
+
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var (
+	x = e.ExitErr
+)
+
+func main() {
+	aa := strings.Split(os.Args[1], "-")
+	if len(aa) != 2 {
+		x(fmt.Errorf("ongeldig argument, moet in formaat yyyy-dd zijn"))
+	}
+
+	year, err := strconv.Atoi(aa[0])
+	x(err)
+	week, err := strconv.Atoi(aa[1])
+	x(err)
+
+	if year < 1000 || year > 9999 {
+		x(fmt.Errorf("ongeldig year: %d", year))
+	}
+	if week < 1 || week > 53 {
+		x(fmt.Errorf("ongeldige week: %d", week))
+	}
+
+	// 15 januari van het jaar
+	t := time.Date(year, 1, 15, 12, 0, 0, 0, time.UTC)
+
+	// eerste gok
+	t = t.AddDate(0, 0, 7*week-14)
+
+	// zoek juiste week
+	var y, w int
+	for {
+		y, w = t.ISOWeek()
+		if y < year {
+			t = t.AddDate(0, 12, 0)
+			continue
+		}
+		if y > year {
+			t = t.AddDate(0, -12, 0)
+			continue
+		}
+		break
+	}
+	for {
+		y, w = t.ISOWeek()
+		if w < week {
+			t = t.AddDate(0, 0, 7)
+			continue
+		}
+		if w > week {
+			t = t.AddDate(0, 0, -7)
+		}
+		break
+	}
+	if y != year {
+		x(fmt.Errorf("ongeldige combinatie van week/jaar: %d/%d", week, year))
+	}
+
+	// zoek begin van de week
+	d := int(t.Weekday())
+	if d == 0 {
+		d = 7
+	}
+	t = t.AddDate(0, 0, 1-d)
+
+	// drie voorgaande weken
+	t2 := t.AddDate(0, 0, -21)
+	for i := range 4 {
+		if i > 0 {
+			fmt.Print(" -or")
+		}
+		y, w := t2.ISOWeek()
+		fmt.Printf(" -name %d-%02d.data.dz", y, w)
+		t2 = t2.AddDate(0, 0, 7)
+	}
+
+	// vanaf begin drie weken geleden t/m eind huidige week
+	t = t.AddDate(0, 0, -21)
+	for range 28 {
+		fmt.Printf(" -or -name %d-%02d-%02d.data.dz", t.Year(), t.Month(), t.Day())
+		t = t.AddDate(0, 0, 1)
+	}
+
+}