Add collection and history saving

models/collection/CollectionHandler.go

@@ -32,3 +32,19 @@ func CollectionFromString(content string) (*NML, error) {
 
 	return &collection, nil
 }
+
+func SaveCollectionToFile(collection *NML, filePath string) error {
+	// Marshal the Collection struct into XML content
+	content, err := xml.MarshalIndent(collection, "", "    ")
+	if err != nil {
+		return err
+	}
+
+	// Write the XML content to the file
+	err = os.WriteFile(filePath, content, 0644)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

models/history/HistoryHandler.go

@@ -57,3 +57,19 @@ func IsHistoryFile(path string) bool {
 func IsHistoryString(content string) bool {
 	return strings.Contains(content, "HistoryData")
 }
+
+func SaveHistoryToFile(history *NML, filePath string) error {
+	// Marshal the NML struct into XML content
+	content, err := xml.MarshalIndent(history, "", "    ")
+	if err != nil {
+		return err
+	}
+
+	// Write the XML content to the file
+	err = os.WriteFile(filePath, content, 0644)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}