What is the equivalent of the deprecated $ (InputDir) macro?

Trying to set up my own pre-processor for a single file, I tried using

"$(testDir)test.exe" "$(InputPath)" "$(ProjectDir)model.c"

      

        
        
        
      

    

As a command line. But "$(InputPath)

deprecated in Visual Studio 2013 and I don't know how to replace this with a non-deprecated macro.