>> :nnoremap <f9> :.,$s/^##//<cr>
>> :nnoremap <f8> :.,$s/^/##/<cr>
>
> But those above look quite useful. However I asked for a way to
> replace the `$' in your :nnoremap <f9> :.,$s/^##//<cr>
>
> I just about never use the visual modes.. probably a bad habit. But
> can you show me how to send vim a numeric argument ($1) along with
> :.,$1s/^##// Where $1 contains a line number.
Ah...this description makes a little more sense. You can omit
the range, and if you prefix the <f8>/<f9> with a count, it will
do that many lines. So if you have
:nnoremap <f8> :s/^/##<cr>
:nnoremap <f9> :s/^##<cr>
You can then type
5<f8>
and it will comment the current line plus the next 4 (5 total).
It does this by acting as if you pressed the colon after the
prefix which pre-populates the command-line with
:.,+4
and then the rest of the mapping is executed-as-typed from there,
making the command
:.,+4s/^/##
and then pressing <cr> to execute the command. This is fairly
easy to do and works for pure counts. For creating your own
commenting command that makes use of "Operator-Pending" mode
(":help operator-pending-mode"), it's a lot more complex and may
be taken care of for you by the Commentify script Luc suggested
earlier. However with this, you can make it take arbitrary
motions. It's dark coding that I've only played with once or
twice when I learned of the functionality. Powerful, but complex.
> Oh and I wondered if the simple notation I used:
>
> nmap <F9> :.,$s/^## //
>
> in ~/.vimrc, is lacking in some way. I mean you have more notation
> around it:
>
> :nnoremap <f9> :.,$s/^##//<cr>
>
> Am I likely to run into problems with the syntax I used?
There are two differences I note:
1) nmap vs. nnoremap: I tend to use nnoremap by default because
it prevents recursive mapping expansion. In this case, there's
no recursive use of "<f9>" within the expansion, so they should
both act the same. But by defaulting to nnoremap, I don't have
to think about it
2) my addition of <cr> at the end. This just means that the
substitute command will be executed when you hit <f9> instead of
waiting for you to hit <enter> at the prompt.
Neither of those two should cause problems. The first one causes
problems if you have something like
:nmap n nzz
where the thing mapped ("n") is used in the expansion ("nzz").
It will recursively expand, hanging vim. However nnoremap
prevents this.
Then there's my obviously missing space after the "##", but
that's my inattentiveness, not an intended difference :)
Hope this helps know more about vim, mappings, and allows you to
modify them with greater understanding.
-tim
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