Added initial structure for include diagram generation

src/include_diagram/model/diagram.h

@@ -0,0 +1,59 @@
+/**
+ * src/include_diagram/model/diagram.h
+ *
+ * Copyright (c) 2021-2022 Bartek Kryza <bkryza@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include "common/model/diagram.h"
+#include "common/model/package.h"
+#include "source_file.h"
+
+#include <type_safe/optional_ref.hpp>
+
+#include <string>
+#include <vector>
+
+namespace clanguml::include_diagram::model {
+
+class diagram : public clanguml::common::model::diagram,
+                public clanguml::common::model::nested_trait<source_file,
+                    filesystem_path> {
+public:
+    diagram() = default;
+
+    diagram(const diagram &) = delete;
+    diagram(diagram &&) = default;
+    diagram &operator=(const diagram &) = delete;
+    diagram &operator=(diagram &&) = default;
+
+    common::model::diagram_t type() const override;
+
+    type_safe::optional_ref<const common::model::diagram_element> get(
+        const std::string &full_name) const;
+
+    void add_file(std::unique_ptr<include_diagram::model::source_file> &&f);
+
+    type_safe::optional_ref<const include_diagram::model::source_file> get_file(
+        const std::string &name) const;
+
+    std::string to_alias(const std::string &full_name) const;
+
+private:
+    std::vector<
+        type_safe::object_ref<const include_diagram::model::source_file, false>>
+        files_;
+};
+}