I have a file name as a std::string that is comprised of a file and path, and I want to rename the file, but keep the extension the same.
As an example change abc to ijk:
/dir1/dir2/dir3/abc.txt ---> /dir1/dir2/dir3/ijk.txt
../../dir1/abc.txt ---> ../../dir1/ijk.txt
I know this can be done using some kind of string processing, but I'd like to use the std::filesystem path as it handles all the edge cases.
Is there a way to do this with the std::filesystem path facilities?
Had a similar situation when having to deal with path formats from different environments, writing a correct parsing or tokenizing process is not trivial, so ended up using the path class that comes with the std libraries.
I think what you want shouldn't be called rename but rather change or modify,
Here is some code that should get you what you're looking for:
std::string change_filename(const std::string old_file_name, const std::string& new_file_name)
{
const std::filesystem::path& old_file {old_file_name};
const std::string ext = old_file.has_extension() ? old_file.extension().string() : "";
return (old_file.parent_path() / (new_file_name + ext)).string();
};