Handle Ctrl-C differently depending on content

[xeruf]

When I receive an Interrupted Err, I do not get any information about the current line. So I wrote a ConditionalEventHandler for Ctrl-C - but none of the parameters seems to provide any information about the content in the line so far. And what the parameter positive means is entirely unclear to me.

This is what I have, but the event is always the Ctrl-C event so Interrupt is never triggered:

struct CtrlCHandler;
impl ConditionalEventHandler for CtrlCHandler {
    fn handle(&self, evt: &Event, n: RepeatCount, positive: bool, ctx: &EventContext) -> Option<Cmd> {
        Some(if evt.get(0).is_some() {
            Cmd::Kill(Movement::WholeLine)
        } else {
            Cmd::Interrupt
        })
    }
}

[gwenn]

n: RepeatCount, positive: bool are used in emacs mode: https://github.com/kkawakam/rustyline/blob/db7209d9db5032a5ee566a2230565867d4c705af/src/keymap.rs#L523 but are irrelevant here.

You can find information about the current line here: https://docs.rs/rustyline/latest/rustyline/struct.EventContext.html#method.line

There is an example here: https://github.com/kkawakam/rustyline/blob/db7209d9db5032a5ee566a2230565867d4c705af/examples/custom_key_bindings.rs#L74-L83