High-level wrapper for readline package

[Nordlöw via Digitalmars-d-learn]

On Thursday, 7 September 2017 at 13:44:52 UTC, Adam D. Ruppe 
wrote:
> On Thursday, 7 September 2017 at 13:37:16 UTC, Nordlöw wrote:
>> Have anybody cooked together high-level bindings on top of the 
>> C-bindings for libreadline here
>
> Have you ever used readline?
>
> The basic C api is already very high level:
>
>
> char* from_user = readline("Prompt> ");
>
>
> I don't think there's a lot to gain by wrapping that...

There's always room for usability improvements when wrapping C 
APIs...

Here's what I hacked together:

version = readline;
extern(C) void add_history(const char*); // missing from 
gnu.readline
/**
    High-level wrapper around GNU libreadline.
  */
const(char)[] readLine(in string prompt,
                        bool useHistory = true)
{
     version(readline)
     {
         import gnu.readline : readline;
         import std.string : toStringz, fromStringz;
         const lineStringz = readline(prompt.toStringz);
         if (useHistory)
         {
             add_history(lineStringz);
         }
         return lineStringz.fromStringz;
     }
     else
     {
         write(prompt); stdout.flush;
         return readln.strip;
     }
}