htod - convert C .h files to D import files

[Walter Bright]

Lionello Lunesu wrote:
> I've been playing around with libcpp (the c preprocessor) from gcc and 
> was wondering if that was indeed enough to make a tool like htod.
> 
> I mean, do you need to parse the C code further, or is a preprocessor 
> (passing you the tokens) enough to do what htod does?
> 
> (You'd have to detect the 3 tokens "unsigned long long" yourself and 
> replace it with "ulong", but that's find&replace, hardly parsing)

htod does a real parse of the C code, and generates the D output from 
the internal symbol table. Parsing it all the way means that the corner 
cases work. Also, it means it'll work with C++ header files that have 
extern "C" declarations in them.

"unsigned long long" can be:

unsigned long long
long unsigned long
long long unsigned
int unsigned long long
unsigned long const int long

etc.