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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