memory List() fix order

Author: Ian Bishop

memory.go

@@ -154,28 +154,34 @@ func (memory *InMemory) Search(kind, query string, start, limit int) (*data.Mess
 func (memory *InMemory) List(start int, limit int) (*data.Messages, error) {
 	var messages = make([]data.Message, 0)
 
+	start = (memory.writeIndex - 1) - start
+	if start < 0 {
+		start = len(memory.Messages) + start
+	}
+
 	if len(memory.Messages) == 0 || start > len(memory.Messages) {
 		msgs := data.Messages(messages)
 		return &msgs, nil
 	}
 
-	if start+limit > len(memory.Messages) {
-		limit = len(memory.Messages) - start
+	if limit > len(memory.Messages) {
+		limit = len(memory.Messages)
 	}
 
-	start = len(memory.Messages) - start - 1
-	end := start - limit
-
-	if start < 0 {
-		start = 0
-	}
-	if end < -1 {
-		end = -1
-	}
-
-	for i := start; i > end; i-- {
-		//for _, m := range memory.MessageIndex[start:end] {
+	i := start
+	for {
+		if len(messages) == limit {
+			break
+		}
 		messages = append(messages, *memory.Messages[i])
+		i--
+		if i < 0 {
+			i = len(memory.Messages) - 1
+		}
+		// we've gone full circle
+		if i == memory.writeIndex {
+			break
+		}
 	}
 
 	msgs := data.Messages(messages)