empty string period is inf

cmd/cli/flag.go

@@ -74,6 +74,10 @@ func (period *Period) setStop(s string) error {
 }
 
 func (*Period) setT(s string, t *time.Time) (time.Time, error) {
+	if s == "" {
+		*t = time.Unix(0, 0)
+		return time.Now().AddDate(100, 0, 0), nil
+	}
 	if result, err := time.Parse("2006", s); err == nil {
 		*t = result
 		return result.AddDate(1, 0, 0).Add(-1 * time.Minute), nil

cmd/cli/main.go

@@ -353,7 +353,7 @@ func Main() {
 		}
 		f, err := os.Open(config.CSV)
 		if err != nil {
-			log.Fatalf("cannot open csv %q: %w", config.CSV, err)
+			log.Fatalf("cannot open csv %q: %v", config.CSV, err)
 		}
 		defer f.Close()
 		reader := csv.NewReader(f)
@@ -384,7 +384,7 @@ func Main() {
 				break
 			}
 			if err != nil {
-				log.Fatalf("failed to read csv line: %w", err)
+				log.Fatalf("failed to read csv line: %v", err)
 			}
 
 			dates := []string{}