One-shot translation of lean 3 files

This is a template which you can use to quickly play with the translation of snippets of lean 3 code. The procedure is:

1. Clone https://github.com/leanprover-community/mathport/

   git clone https://github.com/leanprover-community/mathport/
   

2. get in the folder: cd mathport
3. install dependencies cmake, gmp, gmp-devel, jq if needed. On debian/ubuntu: sudo apt install cmake gmp gmp-devel jq (or libgmp3-dev instead of gmp and gmp-devel). On mac: brew install cmake jq. On windows this script might not work.
4. Run lake exe cache get
5. Run make build (go get some coffee!)
6. Run make lean3-source
7. Get a mathport release with ./download-release.sh. You can also use ./download-release.sh $my_choice to specify an explicit version, e.g. $my_choice = nightly-2022-12-13-04.
8. Put Lean 3 code in Oneshot/lean3-in/main.lean.
9. Put extra #align in Oneshot/lean4-in/Extra.lean
10. Run make oneshot

After the first run, you only have to repeat steps 8-10, unless you want to update mathlib (step 7) or mathport itself (git pull and then steps 4-10).

If things work, at the end you should see # output is in Outputs/src/oneshot/Oneshot/Main.lean. You may need to add import Mathlib.Mathport.Rename to this file before the #align commands work. Also, all you mathlib imports will say import Mathbin.XYZ, and need to be changed to import Mathlib.XYZ.