Re: [dev] [sandy] [PATCH] VIM key bindings.

From: Silvan Jegen <>
Date: Thu, 10 Jul 2014 14:12:52 +0200

On Thu, Jul 10, 2014 at 11:52 AM, Raphaƫl Proust <> wrote:
> On Thu, Jul 10, 2014 at 1:56 AM, Dimitris Zervas <> wrote:
>>>Also it would be nice if the actual text editing
>>>would be clearly separated out, such that different editor frontends
>>>can be implemented easily.
>> Well, this is much easier implemented in OOP languages (which I don't love that much) but I don't know what would be the performance, complexity and code readability would be.
>> I'll take a look, but no promises, as I love TUI (but I hate curses :P )
> On the FP side there is Yi[0]
> The trick that Yi uses is quite clever and not very complicated:
> keyboard input is passed to a lexer/parser which can be rewritten to
> provide alternative bindings. Treating keyboard events like that
> actually makes a lot of sense. It is not very specific to any
> programming paradigm and could be implemented in C (with a recursive
> descent parser if yacc is deemed to suck to much).

Actually, I do not think you will need a "real" recursive parser. It
should be enough to use a finite state machine since you won't have
any recursively nested key bindings.

I am not completely sure how to implement this but it sounds like a
very interesting problem. The states transition should probably look
something like this

(count)? -> (operation)->(object)

where the functions will be called in the final state (?). I will
probably have to think some more about this...


Received on Thu Jul 10 2014 - 14:12:52 CEST

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