regen-object-code

name	regen-object-code
description	Regenerate the git-ignored generated ToObjectN instance code in mtg-pure. Use when the user changes the ObjectN / OT type machinery and needs the ToObjectN.Instances files rebuilt, when a build fails on missing ToObject instances, or when someone has hand-edited a generated file (which must never be done). Explains what regenerates, how, and what to change instead of the output.

Regenerate ToObjectN code

The ToObject_NN[_MM] instance files are generated and git-ignored — never hand-edit them. They are produced from src/MtgPure/Model/Object/ToObjectN/CodeGen.hs.

What is generated

• src/MtgPure/Model/Object/ToObjectN/Instances.hs (the aggregating module) and everything under src/MtgPure/Model/Object/ToObjectN/Instances/ (ToObject_01, ToObject_01_01, …). These are the many modules already listed in exposed-modules in mtg-pure.cabal.

How to regenerate

$ cd src
$ runhaskell MtgPure/Model/Object/ToObjectN/CodeGen.hs
$ cd ..
$ python format.py --everything

CodeGen.hs treats srcDir = ".", so it must be run from inside src/.

Symptoms that you need to regenerate

• Build error about a missing ToObject/ToObjectN instance after adding a new object type or arity.
• A generated file shows up as modified in git status — it should be git-ignored; a diff there usually means someone hand-edited it. Revert and regenerate instead.