Add a way to retrieve the current completer

[minijackson]

I was messing with rustyline, it's completion API and trying do implement multiline editing at the same time, but then I encountered a problem: I need to have the input from the previous lines to have a proper context for my completion system.

Sorry if it's unclear, here's a quick example:

input> if [ x -eq 1 ];
  ...> th<tab>

In this case, my completer need to know that there's an if before to be able to complete the then.

My idea was to store the previous lines as context inside the Completer, but currently there is no way of retrieving the completer in use.

A see two ways of doing this: either make the completer field public or add the get_completer and get_completer_mut methods.

For now, I can do it by replacing the current completer with the added context, but I think that would be better by mutating the completer directly.

If there's a better way, please tell me, I'm open to discussion ;-)

[gwenn]

Hello,
You can keep ownership of your Completer by passing a reference:

    let c = FilenameCompleter::new();
    let mut rl = Editor::with_config(config);
    rl.set_completer(Some(&c));
    // then do something with c

Tell us if it is good enough.

[minijackson]

Oooh, I didn't think of that. Unfortunately, while I can keep the ownership of the completer, I cannot modify it, because it would require having a immutable reference and a mutable reference to the completer at the same time (it's the same if I have a mutable owned completer and an immutable reference to it).