Add CTFE execute function

[Chang Long]

On Saturday, 26 May 2012 at 15:56:38 UTC, Chang Long wrote:
> CTFE execute will be very useful on web develop, for example It 
> is very hard to create a CTFE version template engine with rich 
> feature. But we can use execute call to transe template file to 
> d code string, then mixed it to application.
>
> The vibed project is very cool and I want to add my Jade 
> template to this, but I can't find other way to do it.
>
> Maybe we also need a compiler option to enable this CTFE io 
> operate because security.

Let me make myself more clear, what I suggestion is something 
like this:

mixin(  std.process.execute("/usr/bin/template_engine 
template_file_path.htm") );