Generates gitignore based on difference between extensions before and after compilation
The purpose of this program is to learn and practice with some new features and elements of C++17, as std::filesystem. Taking over a project that has been managed in a different versioning system than Git will not have .gitignore file and then, some has to be created. This is mainly to avoid to include files that are generated during compilation and, because so, are not to be included in the repository.
To create a text file containning the extensions of the repository (before compilation) run the program with the path of the repository as a parameter. Then the file will be created in the folder the program is located. The file will contain the different extensions found in the files with the dot before the extension.
When you want to check if new file extensions were created in compilation (as, for example, object files) you pass as parameters the name of the created file with the extensions and as second parameter the path to the repository. Once it finished, if there is any new extension for any files in the repository generated in the compilation, the program will create the .gitignore file in the root folder of the repo (the path you fed the program with).
This software will be useful in a few situations. Usually, projects are configured to get rid of the objetc files once the compilation is a success. But sometimes, there is no cleaning after compilation and there are several intermediate files that are not needed. However, in some cases, those have common extensions so they will not be excluded.
So, as said, this is an "academic" work to practice the use of the new std::filesystem of C++17. Feel free to add or impove it and let me know. Regards. VHM