Import generic functions

[Kolterdyx]

Hello! I came across this project from your post on Reddit. I wanted to say so far it looks quite promising!

Is generic converter support a thing that could be done? It would be very useful for this case:

//go:build convgen

package main

import (
	"github.com/sublee/convgen"
)

func OptionalConverter[T any](v *T) Optional[T] {
	if v == nil {
		return Optional[T]{}
	}
	return Optional[T]{
		Value: *v,
		Set:   true,
		Valid: true,
	}
}


var mod = convgen.Module(
	convgen.ImportFunc(OptionalConverter), // this doesn't compile, just an example
)

var A2B = convgen.Struct[A, B](mod)

And then in the main file:

package main

type Optional[T any] struct {
	Value T
	Valid bool
	Set   bool
}

type A struct {
	Field *string
}

type B struct {
	Field Optional[string]
}

I understand this may be complex to implement, but since the generator is based on AST parsing and not actual execution of the configuration code, I think it may be doable, for example checking for a specific kind of generic instance with a dummy type:

var mod = convgen.Module(
	convgen.ImportFuncGeneric(OptionalConverter[convgen.G]), // this would compile, and the parser could check for it
)

The generated code would the use the proper generic instances. I'd be willing to come up with a PR if you think this is feasible