How do I use OpCodes?

[peak pollen]

what is the code you want to inject

also is it necessary for you to replace those lines?

[mighty zinc]

replacing the lines (..) with my own
does this mean you want to add a new mode? or do you want to modify what those modes do?

[brittle atlas]

i want to change the variables being compared to use my own mod's equivalent settings

this can either be None, Chapter or File just like vanilla

this is what it would look like if i wanted to replace the code but idk if i should

or that, in case my mod is turned off but not disabled