Feature Request: Assembling "external" functions

[rdaly525]

def test_extern_function():

    class Op(Enum):
        And=1
        Or=2

    @family_closure
    def PE_fc(family):

        Bit = family.Bit

        @family.assemble_function(locals(), globals())
        def fun(op: Op, in0: Bit, in1: Bit) -> Bit:
            if op == Op.And:
                return in0 & in1
            else: #op == Op.Or
                return in0 | in1

        @family.assemble(locals(), globals())
        class PE_Extern(Peak):
            def __call__(self, op: Op, in0: Bit, in1: Bit) -> Bit:
                return fun(op, in0, in1)

        return PE_Extern

This is a proposal for a way to assemble user defined helper functions. Allows users to write more modular code and is conceptually similar to using magma's circuit.combinational on arbitrary functions. Initial implementation in branch 'extern'