This tool erases parts of Lean code and replaces them with sorry. I developed this to make it easier to manage exercises in textbooks written in Lean.
This is inspired by a script in a glimpse of lean.
Add this repository to your lakefile:
require «mk-exercise» from git
"https://github.com/Seasawher/mk-exercise" @ "main"Don't forget to run lake update mk-exercise after editing the lakefile. And simply run lake exe mk_exercise <input_dir> <output_dir>.
GitHub Action allows you to run this every time a particular branch is updated, automatically updating the exercises to the latest state. You may wish to look at yuma-mizuno/lean-math-workshop, where exercises are managed using this tool.
- Replace the code enclosed by
-- sorrywithsorry, preserving indentation. - Replace the code after
/- sorry -/with sorry. - Lines ending with
--##are ignored. - Blocks enclosed with
--##--are ignored.
Check the test code for more information.