bindgen experiment

This is a very limited subset of something I using to test this https://github.com/Papierkorb/bindgen

Current problems

First, this does not work because of this:

# make

# crystal src/binding_test.cr 
In src/storage.cr:97:23

 97 | mount_options : std::vector<std::string>
                       ^
Error: expecting token 'CONST', not 'std'

Second, if I remove the line in SimpleEtcFstab.h declaring mount_options (just to move forward). I get this:

# make

# crystal src/binding_test.cr 
Showing last frame. Use --error-trace for full trace.

In /usr/share/crystal/src/indexable.cr:26:16

 26 | abstract def unsafe_fetch(index : Int)
                   ^-----------
Error: abstract `def Indexable(T)#unsafe_fetch(index : Int)` must be implemented by Storage::Container_std__vector_std__string

Last but not least, if I manually edit src/storage.cr and change this:

def unsafe_fetch(index : Int32) : String

into this:

def unsafe_fetch(index : Int) : String

I get this:

# crystal src/binding_test.cr 
Showing last frame. Use --error-trace for full trace.

In src/storage.cr:111:5

 111 | @unwrap = result
       ^------
Error: instance variable '@unwrap' of Storage::SimpleEtcFstabEntry must be Storage::Binding::SimpleEtcFstabEntry, not Pointer(Storage::Binding::SimpleEtcFstabEntry)

That's the point in which I gave up.