CMake and Code Improvements

[yazdanbhd]

There are several areas in the project that could benefit from enhancements in both the CMake setup and the code itself. Below are the suggested improvements:

CMake Improvements

1. Specify C++ version:

   • Explicitly set the C++ standard in your CMakeLists.txt file.

2. Modernize package finding:

   • Replace pkg_check_modules with find_package or use PkgConfig:: imported targets.
   • Update your linking command to:

     target_link_libraries(${PROJECT_NAME} PRIVATE libcurl PkgConfig::GTKMM)

3. Explicit source file listing:

   • Replace file(GLOB) with explicit listing of source files to ensure CMake picks up new files correctly.

4. Cross-platform support:

   • Enhance CMake configuration to handle macOS and Windows platforms in addition to Linux.

5. Proper c-ares integration:

   • Use FetchContent to include c-ares since libcurl uses it when ENABLE_ARES is set to ON.

Code Improvements

1. Replace NULL with nullptr:

   • Use nullptr instead of NULL throughout the codebase for improved type safety.

2. RAII for CURL handle:

   • Wrap CURL handle in a smart pointer or custom RAII class for exception safety.

3. Use static_cast:

   • Replace C-style casts with static_cast for improved type safety.

4. Utilize smart pointers:

   • Implement smart pointers for dynamically allocated objects to ensure automatic resource cleanup and exception safety.

[Saman-Safaei-Dev]

Thanks for opening this issue.
I applied the CMake Improvements on the project. Can you open a pull request and apply Code Improvements to the updated source code?