char** support about nimterop HOT 2 CLOSED

Can we also have support for pointer-of-pointer?

I'm wrapping kmod and they have functions like this:

struct kmod_module;
int kmod_module_new_from_name(struct kmod_ctx *ctx, const char *name,
						struct kmod_module **mod);

These can be roughly mapped to

proc kmod_module_new_from_name*(ctx: ptr kmod_ctx; name: cstring; `mod`: var ptr kmod_module): int {.importc, header: headerlibkmod.}

from nimterop.

This has been implemented in the latest commit.

Considering there's no way to know what the developer meant with char ** - could be array of cstring or pointer to a cstring, I'm just mapping everything to ptr ptr, except ptr ptr cchar which becomes ptr cstring. This was one of Araq's examples of how you cannot always translate 100% automatically.

@alaviss - your case will become ptr ptr kmod_module. This is how c2nim does it right now as well.

type
  kmod_module* {.bycopy.} = object

proc kmod_module_new_from_name*(ctx: ptr kmod_ctx, name: cstring, `mod`: ptr ptr kmod_module): cint {.importc, header: headertest.}

Open to feedback.

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