Add flag to parse matching `#define *` into `enum`s instead of constants

[Emilgardis]

Hi! I have a header file I'd rather not touch, and I want to convert some #define directives that are integers into enums, such that --constified-enum-module, --bitfield-enum etc would work as expected

#define FOO_BAR_A_BAZ 0
#define FOO_BAR_BOB 1
#define FOO_BAR_C 2
#define FOO_BAR_D 3

Given above header, generate the equivalent code as for when parsing

enum FOO_BAR {
    A_BAZ=0,
    BOB=1,
    C=2,
    D=3,
};

This should also keep comments intact.

Is this possible to implement?

[pvdrz]

This is definitely possible to implement but at the same time I think it could be quite fragile.

A reasonable API for this would be to provide a list of prefixes that, when matched, turn every constant with that prefix into a variant of an enumeration. However, I see cases where such prefix could be used for something unrelated and end up being part of the enum by accident.