Re: Buffer-local unmap of global mapping

Am 13.01.2013 21:42, schrieb Michael Henry:
> All,
>
> I've got several two-key global mappings for the CtrlP plugin:
>
> nnoremap <C-P><C-O> :<C-U>CtrlPBuffer<CR>
> nnoremap <C-P><C-P> :<C-U>CtrlP<CR>
> [...]
>
> These mappings interact with plugins that provide buffer-local
> mappings that are prefixes of these multi-key mappings. For
> example, the Tagbar plugin defines a normal-mode buffer-local
> mapping for CTRL-P.
>
> The problem is that when I press CTRL-P in the Tagbar window,
> Vim assumes that it might be the prefix for the global mappings
> for CtrlP, so it waits for 'timeoutlen' before deciding to
> invoke the single-key buffer-local mapping for Tagbar. Because
> my preferred 'timeoutlen' is three seconds, this renders the
> buffer-local mapping essentially useless for me.
>
> My current work-around is to map the key CTRL-P to a prefix,
> then combine that prefix with other keys to make the final
> mappings, something like this:
>
> nmap <C-P> <SID>CtrlP
> nnoremap <SID>CtrlP<C-O> :<C-U>CtrlPBuffer<CR>
> nnoremap <SID>CtrlP<C-P> :<C-U>CtrlP<CR>
>
> This way, Vim won't see any multi-key mappings that begin with
> CTRL-P, so a buffer-local mapping of CTRL-P will execute without
> waiting for 'timeoutlen'.
>
> Is there a better way to handle this problem in general? I
> don't see a way to "unmap" the global mappings on a per-buffer
> basis, and I'd like to keep the global mappings in-place for
> most buffers while Tagbar is running so globally unmapping when
> Tagbar opens and restoring when it closes doesn't quite fit the
> bill, either.
>
> Thanks,
> Michael Henry

I don't have an answer, I think what you tried is the best you can get
so far.

But I agree, a general solution would be useful!

Several plugins (buffer explorers, file explorers) define a lot of short
keys (keys like `d' or `y'), but it's awkward to use them because they
often wait for a longer global sequence (e.g. `ds', `ys' from
surround.vim).

First idea: add a new buffer-local option that, when enabled, means:
Only check buffer-local mappings (not global mappings) when waiting
for a complete left-hand-side.

Using an option, the mechanism could be turned on and off (how would I
otherwise access a global mapping?);
(this is opposed to a new mapping modifier (next to <buffer>, <silent>,...)).

--
Andy

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