return error if no groups are found

Signed-off-by: Jean Mertz <[email protected]>

Author: JeanMertz

cmd/saw.go

@@ -42,19 +42,23 @@ func runMultiGroup(pattern string, fn func(string)) error {
 	}
 
 	b := blade.NewBlade(&config.Configuration{}, &awsConfig, nil)
+	groups := b.GetLogGroups()
+	if len(groups) == 0 {
+		return fmt.Errorf("no groups found matching pattern: %s", pattern)
+	}
 
 	var wg sync.WaitGroup
-	for _, group := range b.GetLogGroups() {
-		name := group.LogGroupName
-		if name == nil || !re.MatchString(*name) {
+	for _, g := range groups {
+		group := g.LogGroupName
+		if group == nil || !re.MatchString(*group) {
 			continue
 		}
 
 		wg.Add(1)
 		go func(group string) {
 			defer wg.Done()
 			fn(group)
-		}(*name)
+		}(*group)
 	}
 
 	wg.Wait()