Re: What is gained by the extra level of map indirection recommended in help?

Am 29.11.2016 um 20:18 schrieb Brett Stahlman:
> The 'write-plugin' section of the help recommends the following
> 3-level map approach:
>
> map ,c <Plug>TypecorrAdd
> noremap <unique> <script> <Plug>TypecorrAdd <SID>Add
> noremap <SID>Add :call <SID>Add(expand("<cword>"), 1)<CR>
>
> I understand how it works, but it wasn't immediately clear to me what
> was being gained by the middle level of indirection: specifically the
> map to <SID>Add. What is the advantage of this strategy over the
> following 2-level approach?
>
> map ,c <Plug>TypecorrAdd
> noremap <unique> <script> <Plug>TypecorrAdd
> \ :call <SID>Add(expand("<cword>"), 1)<CR>

Your "2-level approach" contains a mistake: `<script>' should be
removed.

> The help says...
> "If another script would also map <SID>Add, it would get another
> script ID and thus define another mapping."
>
> While this is true, isn't this sort of script-uniqueness already
> guaranteed by the use of <SID> in the rhs of the 3rd mapping? I.e.,
> :call <SID>Add(...)<CR>

It is.

`<script>' controls "remapping", not "script-uniqueness".

There is ":map" (remapping on) and ":noremap" (remapping off) and then
there is ":noremap <script>" (remapping on for <SID> maps, remapping off
otherwise). ":map <script>" can be used also, it's the same.

--
Andy

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