I do the same with latex when generating contracts for my company. The makefile and its corresponding python program asks for various arguments (company name, x

I do the same with latex when generating contracts for my company. The makefile and its corresponding python program asks for various arguments (company name, xxx, yyy). Then it generates the contract with the associated prices. I even put some automatic reduction/gifts in place (free service) if the amount is bigger than X or Y. I quite like it !