[GSoC] Header Generation for C/C++

[bachmeier]

On Tuesday, 16 July 2019 at 13:16:50 UTC, Eduard Staniloiu wrote:

> So, by running,
> `dmd -HCf=ab.h -HCd=mypath/ a.d b.d` will write the generated 
> header in `mypath/ab.h`, relative to the current directory.

Will it be possible to extend this for other languages? That 
would be a killer application. For instance

dmd -HRuby=ab.rb -HCd=mypath/ a.d b.d

goes a step further, converting what would have been the 
generated C header to the file ab.rb containing (taken from 
https://github.com/ffi/ffi/wiki/Examples)

module ab
   extend FFI::Library
   ffi_lib "path/to/ab.so"
   attach_function :calculate_something, [:int, :float], :double
   attach_function :error_code, [], :int # note empty array for 
functions taking zero arguments
   attach_function :create_object, [:string], :pointer
   attach_function :calculate_something_else, [:double, :pointer], 
:double
   attach_function :free_object, [:pointer], :void
end

Then the Ruby script would call ab.rb as

require 'ffi'
require 'ab'

c = ab.calculate_something(42, 98.6) # note FFI handles literals 
just fine
if ( (errcode = ab.error_code()) != 0)
   puts "error calculating something: #{errcode}"
   exit 1
end

objptr = ab.create_object("my object") # note FFI handles string 
literals as well
d = ab.calculate_something_else(c, objptr)
ab.free_object(objptr)

puts "calculated #{d}"