Take a look at my library for parsing GTP commands

[iopq]

https://crates.io/crates/gtp-parser-generator

I specifically wrote this for Iomrascalai

I will probably improve some error handling and stuff, but meanwhile it should really help with defining new commands - currently there are a lot of places that need to be updated for each new custom iomrascalai command

Also should fix #266

[ujh]

👍 I will have a look when I get back to the project. Of course you're free to open a PR which implements this.