Added option to rebuild the complete calendar

src/calanonsync/calanonsync.go

@@ -8,12 +8,17 @@ import (
 	"time"
 )
 
+var syncSettings = struct {
+	rebuild bool
+}{}
+
 func main() {
 	rootCmd := &cobra.Command{
 		Use:   "calanonsync",
 		Short: "Synchronize a calendar from EWS to CalDAV by event time and an anonymized title only.",
 		Run:   runSynchronization,
 	}
+	rootCmd.Flags().BoolVar(&syncSettings.rebuild, "rebuild", false, "Rebuild all calendar items, no matter if they already exist.")
 
 	rootCmd.AddCommand(InitSettingsCmd())
 
@@ -66,6 +71,13 @@ func runSynchronization(cmd *cobra.Command, args []string) {
 	for uid, calDavItem := range calDavItemMap {
 		if ewsItem, ok := relevantEWSItems[uid]; ok {
 			// Good, so we still know the item at least.
+
+			// If we want a full rebuild, we can skip this step
+			// since we will create new items anyway.
+			if syncSettings.rebuild {
+				continue
+			}
+
 			if !ewsItem.Start.Equal(calDavItem.Start()) ||
 				!ewsItem.End.Equal(calDavItem.End()) {
 
@@ -92,9 +104,9 @@ func runSynchronization(cmd *cobra.Command, args []string) {
 		}
 	}
 
-	// Find items we don't know so far and create them.
+	// Find items we don't know so far and create them. Also recreate them if we want to rebuild all.
 	for uid, ewsItem := range relevantEWSItems {
-		if _, ok := calDavItemMap[uid]; !ok {
+		if _, ok := calDavItemMap[uid]; !ok || syncSettings.rebuild {
 			title := s.Anonymize.Title.Apply(ewsItem.Subject)
 			ical := CreateICal(ewsItem.Hash(), title, ewsItem.Start, ewsItem.End, ewsItem.IsAllDayEvent)
 			calDavItem := CalDAVItem{HRef: uid + ".ics", ICal: ical}