Plugin that preserves locals between lines

[hoelzro]

Ideas for how this could work:

• Use debug.sethook to catch the return of our compiled chunk and grab its locals
• Rewrite source code/bytecode before evaluation
• Custom interpreter patch to "pcall and get locals"
• Custom module that dips into internals to "pcall and get locals"
• Add a chunk of source code to the end of the chunk to grab the locals

[technomancy]

This PR in the Fennel repl implements this feature using debug.getlocal by splicing in some code to save off and reintroduce locals to every chunk: bakpakin/Fennel#114

I'd be interested to hear what you think about it. Though the PR is for Fennel, the exact same approach should work for Lua.

[hoelzro]

@technomancy I like the approach! If you want to port this logic to a lua-repl plugin, I would be happy to accept it!

[technomancy]

Thanks; I'm not doing much Lua these days but I might circle back to this at some point. If anyone wants to beat me to it it'd probably happen quicker that way. =)