If you have not done very much on your hard drive since you reset the repository, there are a couple things that you can do.
First, shut down your computer to prevent the files from being overwritten.
Use another computer to make a bootable USB device, and access your computer without using the hard drive.
Use a tool like wxhexeditor to find the files in the raw data of the hard drive(I had to do this a while back, its fairly slow to search). If you use Linux on the bootable USB this will be in the /dev folder. You should search the drive for function signatures or variable names that are unlikely to be present outside of your code. Keep in mind that there may be multiple versions of the file on your hard drive, so make sure that the version you find is the most up to date one.
Copy the files onto on external drive or onto the cloud, and redownload them onto your computer.

This is probably useful if other tools have not worked, as it is slower and more manual than other options.
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