Re: Preventing Double maps/abbs

Hi,

howard Schwartz wrote:
> I recently discovered a pitfall similar to recursive abbreviations or maps (in
> math logic we would would tend to call them `transitive' instead of recursive).
>
> As you know, noremap prevents map a b then map b c thus mapping a to c
>
> But a ran into this dilemma: my friend used these abbreviations and maps:
>
> ab q can map q i ^[
> ab gr gramma map g :write^M
>
> thus eliminating the gq formatting command. When I tried to restore it, I
> first tried to unmap q

it would probably have been better if your friend had used

iabbrev q can
iabbrev gr gramma
nmap q i ^[
nmap g :write^M

to define the abbreviations and maps, thus restricting them to the modes
where they are really needed.

> I got the error message, ``No such mapping'' even though the maps command
> clearly listedd q as mapped to write. I quickly learned I had to
> unabbreviate q before I could unmap q. Similar things applied to the letter g
> in order to recover he command gq.
>
> What seems to happen is an interaction between abbreviations and maps: When I
> gave the ex command :q <ENTER> upon hitting <ENTER> vim expands q to `can' and
> then treats `can' as a write command. When I try to unmap q, I press
> <ENTER>. Thus,
> q expands to `can' and vim correctly replies ``no such mapping'' meaning
> there is no direct map of the latters `can' to a write command.

For me Vim's reply is

E492: Not an editor command: can

No remapping took place, but "can" is not a recognized command.

> Multiple abbreviations or maps of the same letters is not a problem, within
> maps or ab alone -- ordinarily last definition wins.
>
> What seems to be needed is a version of abbreviate that says ``only abbreviate
> these letters, do not use them to map a command''. The modes for maps and ab
> do not help, because sometimes one really wants letters expanded on the
> command line, for example when executing a substitute command.

There are also [ic]noreabbrev variants which would prevent the
right-hand-side of an abbreviation to be re-used as the left-hand-side
of a mapping.

Regards,
Jürgen

--
Sometimes I think the surest sign that intelligent life exists elsewhere
in the universe is that none of it has tried to contact us. (Calvin)

--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php