[wip] Support multiple triggers on func subscribe command

cmd/subscribe.go

@@ -45,7 +45,7 @@ and an 'extension' attribute for the value 'my-extension-value'.
 
 func runSubscribe(cmd *cobra.Command) (err error) {
 	var (
-		cfg subscibeConfig
+		cfg subscribeConfig
 		f   fn.Function
 	)
 	cfg = newSubscribeConfig(cmd)
@@ -61,66 +61,69 @@ func runSubscribe(cmd *cobra.Command) (err error) {
 	}
 
 	// add subscription	to function
-	f.Deploy.Subscriptions = updateOrAddSubscription(f.Deploy.Subscriptions, cfg)
+	f.Deploy.Subscriptions = addNewSubscriptions(f.Deploy.Subscriptions, cfg)
 
 	// pump it
 	return f.Write()
 }
 
-func extractFilterMap(filters []string) map[string]string {
-	subscriptionFilters := make(map[string]string)
+func extractNewSubscriptions(filters []string, source string) (newSubscriptions []*subscriptionConfig) {
 	for _, filter := range filters {
 		kv := strings.Split(filter, "=")
 		if len(kv) != 2 {
 			fmt.Println("Invalid pair:", filter)
 			continue
 		}
-		key := kv[0]
-		value := kv[1]
-		subscriptionFilters[key] = value
+		filterKey := kv[0]
+		filterValue := kv[1]
+		newSubscriptions = append(newSubscriptions, &subscriptionConfig{
+			Source:      source,
+			FilterKey:   filterKey,
+			FilterValue: filterValue,
+		})
 	}
-	return subscriptionFilters
+	return newSubscriptions
+}
+
+type subscriptionConfig struct {
+	Source      string
+	FilterKey   string
+	FilterValue string
 }
 
-type subscibeConfig struct {
+type subscribeConfig struct {
 	Filter []string
 	Source string
 }
 
-func updateOrAddSubscription(subscriptions []fn.KnativeSubscription, cfg subscibeConfig) []fn.KnativeSubscription {
-	found := false
-	newFilters := extractFilterMap(cfg.Filter)
-
-	// Iterate over subscriptions to find if one with the same source already exists
-	for i, subscription := range subscriptions {
-		if subscription.Source == cfg.Source {
-			found = true
-
-			if subscription.Filters == nil {
-				subscription.Filters = make(map[string]string)
+func addNewSubscriptions(subscriptions []fn.KnativeSubscription, cfg subscribeConfig) []fn.KnativeSubscription {
+	newSubscriptions := extractNewSubscriptions(cfg.Filter, cfg.Source)
+	for _, newSubscription := range newSubscriptions {
+		isNew := true
+		for _, subscription := range subscriptions {
+			if subscription.Source == newSubscription.Source {
+				for k, v := range subscription.Filters {
+					if k == newSubscription.FilterKey && v == newSubscription.FilterValue {
+						isNew = false
+						break
+					}
+				}
 			}
-
-			// Update filters. Override if the key already exists.
-			for newKey, newValue := range newFilters {
-				subscription.Filters[newKey] = newValue
-			}
-			subscriptions[i] = subscription // Reassign the updated subscription
-			break
 		}
-	}
-
-	// If a subscription with the source was not found, add a new one
-	if !found {
-		subscriptions = append(subscriptions, fn.KnativeSubscription{
-			Source:  cfg.Source,
-			Filters: newFilters,
-		})
+		if isNew {
+			newFilter := make(map[string]string)
+			newFilter[newSubscription.FilterKey] = newSubscription.FilterValue
+			subscriptions = append(subscriptions, fn.KnativeSubscription{
+				Source:  cfg.Source,
+				Filters: newFilter,
+			})
+		}
 	}
 	return subscriptions
 }
 
-func newSubscribeConfig(cmd *cobra.Command) (c subscibeConfig) {
-	c = subscibeConfig{
+func newSubscribeConfig(cmd *cobra.Command) (c subscribeConfig) {
+	c = subscribeConfig{
 		Filter: viper.GetStringSlice("filter"),
 		Source: viper.GetString("source"),
 	}