Added initial seqence diagram support

src/uml/sequence_diagram_model.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <clang-c/CXCompilationDatabase.h>
+#include <clang-c/Index.h>
+#include <spdlog/spdlog.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace clanguml {
+namespace model {
+namespace sequence_diagram {
+
+enum class message_t { kCall, kReturn };
+
+struct message {
+    message_t type;
+    std::string from;
+    std::string from_usr;
+    std::string to;
+    std::string message;
+    unsigned int line;
+};
+
+struct diagram {
+    std::string name;
+    std::vector<message> sequence;
+
+    void sort()
+    {
+        std::sort(sequence.begin(), sequence.end(),
+            [](const auto &a, const auto &b) -> bool {
+                if (a.from_usr == b.from_usr)
+                    return a.line > b.line;
+
+                return a.from_usr > b.from_usr;
+            });
+    }
+};
+}
+}
+}