chore: structured src/gui, run clang-format

src/gui/platform/font_loader.hpp

@@ -0,0 +1,31 @@
+#ifndef CLRSYNC_GUI_SYSTEM_FONT_LOADER_HPP
+#define CLRSYNC_GUI_SYSTEM_FONT_LOADER_HPP
+
+#include <imgui.h>
+#include <string>
+#include <vector>
+
+class font_loader
+{
+  public:
+    font_loader() = default;
+
+    ImFont *load_font(const char *font_name, float size_px);
+    void push_default_font();
+    void pop_font();
+
+    std::vector<std::string> get_system_fonts();
+
+  private:
+    std::string find_font_path(const char *font_name);
+
+#if defined(_WIN32)
+    static std::string find_font_windows(const char *font_name);
+#elif defined(__APPLE__)
+    std::vector<unsigned char> load_font_macos(const char *font_name);
+#else
+    std::string find_font_linux(const char *font_name);
+#endif
+};
+
+#endif // CLRSYNC_GUI_SYSTEM_FONT_LOADER_HPP