Chord keybindings

[darrenburns]

I'd love to be able to create chorded keybindings. I think this would solve much of the namespacing issue we have with limited keybings available.

Maybe I could define a binding like this:

Binding("ctrl+k/u", ...)

(That syntax probably isn't the best - but it hopefully gets the idea across)

This would mean if the user presses ctrl+k followed by u, the action would fire.

Alternatively:

BINDINGS = [
    Binding("x", ...),
    Chord("ctrl+k", [
        Binding("a", ...),
        Binding("b", ...),
    ])
]

In this example, ctrl+k followed by a would trigger an action. ctrl+k followed by b would trigger another action.

This would integrate into the footer, so after pressing ctrl+k, the footer would update to only show a and b.

Sometimes these systems have things like timeouts e.g. Chord("ctrl+k", timeout=5, bindings=[...]) would mean after pressing ctrl+k, the bindings inside the chord would be available for 5 seconds. Perhaps pressing escape could short circuit it and take you back to the parent bindings.

[1dancook]

The tree-like syntax in your second example looks great! It also looks very easy to continue nesting.

One thing to implement is a keypress to "back out" of the chord. Usually this is ESC.