Vim comment and uncomment blocks of code

arkara · 2010-07-23 16:19:06

I am trying to configure my .vimrc in order to enable code block comment and uncomment
by ,/ and ,<Space> combinations but it can't seem to work.

Any ideas?

I like this one cause, i can add an if for every filetype
that i want to enable this feature.

if &filetype == "vim"
   map ,/ :s/^/"/<CR> 
   map ,<Space> :s/^"//<CR>
elseif &filetype == "c" 
   map ,/ :s/^/\/\//<CR>
   map ,<Space> :s/^\/\///<CR>:nohlsearch<CR>
elseif &filetype == "cpp"
   map ,/ :s/^/\/\//<CR>
   map ,<Space> :s/^\/\///<CR>:nohlsearch<CR>
endif

Last edited by arkara (2010-07-23 16:20:09)

karol · 2010-07-23 16:20:33

There are plugins like nerdcommenter that help w/ such tasks.
http://aur.archlinux.org/packages.php?ID=27698

arkara · 2010-07-23 16:30:42

Awesome. But is there a way to change the mappings?

brisbin33 · 2010-07-23 18:12:49

i've got a function from rson's vimrc that works great. it toggles comments on/off of a visual block. you can define start and end comment strings ('//' and '' or '' for example) globally or by filetype.

here's some snippets:

" default comment symbol
let g:StartComment="#"
let g:EndComment=""

" example of changing it for a filetype
au FileType c,cpp  let g:StartComment = "//"

" call the function on ,c (my local leader is ',')
vmap <LocalLeader>c :call CommentLines()<CR>

" and the function itself
function! CommentLines()
  try
    execute ":s@^".g:StartComment."@\@g"
    execute ":s@".g:EndComment."$@@g"
  catch
    execute ":s@^@".g:StartComment."@g"
    execute ":s@$@".g:EndComment."@g"
  endtry
endfunction

egan · 2010-07-23 20:43:27

Block insert works for me. ^V to select a column and I to insert, in this case a comment character.

brisbin33 · 2010-07-23 20:49:24

egan wrote:

Block insert works for me. ^V to select a column and I to insert, in this case a comment character.

shit, never knew that (X to remove, in this case a comment character, too). epically useful in general, thanks.

bernarcher · 2010-07-23 22:20:24

brisbin33 wrote:

egan wrote:
Block insert works for me. ^V to select a column and I to insert, in this case a comment character.
shit, never knew that (X to remove, in this case a comment character, too). epically useful in general, thanks.

One more solution:

X command is ok to remove properly lined up comment character columns.

To insert multiple comment characters I use the substitution command. E.g. select a visual block of lines to comment (V command), then insert the comment characters by "substituting" the beginning of those lines:

:'<,'>s#^#// #

Or for standard C comments repeat this for the end of line as well with this comment sequence:

:'<,'>s#^#/* #
gv
:'<,'>s#$# */#

Certainly you can remove this by backward substitution over the same visual selection:

:'<,'>s#/\* ##
gv
:'<,'>s# \*/##

Which is useful if the comment characters happen to be not properly lined up.

moljac024 · 2010-07-24 09:15:34

Or use emacs, just highlight the lines you want and press M-;

Last edited by moljac024 (2010-07-24 09:16:53)

bernarcher · 2010-07-24 09:22:11

moljac024 wrote:

Or use emacs, just highlight the lines you want and press M-;

SACRILEGE!!!
This is a vim only topic.

(But if I'm on emacs, I certainly use this feature...)

rson451 · 2010-07-24 13:42:52

brisbin33 wrote:

egan wrote:
Block insert works for me. ^V to select a column and I to insert, in this case a comment character.
shit, never knew that (X to remove, in this case a comment character, too). epically useful in general, thanks.

You obviously didn't see my first post about comments

Arch Linux

#1 2010-07-23 16:19:06

Vim comment and uncomment blocks of code

#2 2010-07-23 16:20:33

Re: Vim comment and uncomment blocks of code

#3 2010-07-23 16:30:42

Re: Vim comment and uncomment blocks of code

#4 2010-07-23 18:12:49

Re: Vim comment and uncomment blocks of code

#5 2010-07-23 20:43:27

Re: Vim comment and uncomment blocks of code

#6 2010-07-23 20:49:24

Re: Vim comment and uncomment blocks of code

#7 2010-07-23 22:20:24

Re: Vim comment and uncomment blocks of code

#8 2010-07-24 09:15:34

Re: Vim comment and uncomment blocks of code

#9 2010-07-24 09:22:11

Re: Vim comment and uncomment blocks of code

#10 2010-07-24 13:42:52

Re: Vim comment and uncomment blocks of code

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