How to map to toggle comments in vim?

Question

I use vim under iterm2. I'm using the NERDCommenter plugin, and I'd like to use Ctrl+/ to toggle comments (Trying to switch from Idea/Eclipse to vim). This is my mapping in the .vimrc :

 nmap <C-/> <leader>c<Space>
 vmap <C-/> <leader>c<Space>

But it doesn't seem to work. What can be the reason?

score 69 · Accepted Answer · answered Jan 29 '12 at 08:35

69

For some reason, vim registers <C-/> as <C-_> (you can see it in insert mode using <C-v><C-/>). It can be the terminal or a historical design thing that terminal apps have to suffer.

And Gvim doesn't even try to recognize <C-/>. Sees it as single /.

answered Jan 29 '12 at 08:35

mike3996

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Thanks! I just mapped it to and it works! Original idea was to map to but that doesn't even register in vim, I think... – dev_nut Jan 29 '12 at 14:05
2

Is this only on iterm2? I'm using Terminal.app and just get the bell ding error and nothing happens. However, when I actually press the `_` key in the `` binding, it will do the comment toggle. How can I get Terminal.app to use the `` binding ? – skilbjo Aug 13 '16 at 09:28
1

Note on the above ^^ `` only works on the underscore on numeric keypads (10key), not on the apple compact keyboard. Additionally, `` is not a valid keycode (apparently there are limited `CTRL + letters` and `/` is not one of them). Source: http://vim.1045645.n5.nabble.com/How-to-map-Ctrl-td1192843.html – skilbjo Aug 17 '16 at 07:32
`` for terminal and iTerm works like a charm, but it doesn't for macvim. Did anyone happen to find a way around it by any chance? – AntK Oct 09 '17 at 01:44

score 23 · Answer 2 · answered Feb 08 '18 at 16:44

23

Here is how you can do it regaining the selection if you are in visual mode:

nmap <C-_>   <Plug>NERDCommenterToggle
vmap <C-_>   <Plug>NERDCommenterToggle<CR>gv

answered Feb 08 '18 at 16:44

Marcelo Lazaroni

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`gv` Saved my life. Thank you ! – Aswath K Jul 12 '19 at 03:17
For me made the trick, as I had already mapped: `vmap NERDCommenterTogglegv` – tebanep Aug 04 '20 at 02:36

score 4 · Answer 3 · answered Jun 19 '17 at 07:40

4

Just to sum up the information from other answers. For me (there might be a difference due to the fact that I'm using neovim) <C-/> works fine on Windows, but I need to use <C-_> on Linux:

if has('win32')
  nmap <C-/> <leader>c<Space>
  vmap <C-/> <leader>c<Space>
else
  nmap <C-_> <leader>c<Space>
  vmap <C-_> <leader>c<Space>
endif

answered Jun 19 '17 at 07:40

Hope

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I use neovide with `neovide --remote-tcp=localhost:6666` and running neovim in wsl, can not use nmap c – Good Pen May 10 '22 at 10:23

Terence · Answer 4 · 2018-02-07T08:11:14.327

If you're using iTerm2 + vim, maybe the following steps can help you:

Add following code to your .vimrc file.

map ,cc <plug>NERDCommenterToggle

or if you have defined your <leader> as ,

map <leader>cc <plug>NERDCommenterToggle
Check if you can use ,cc to toggle comments in vim
Open iTerm2 -> Preferences -> Keys, click the + button
Select Send Text with "vim" Special Chars, enter ,cc, like this.
Now you can use C-/ to toggle comments in vim.

How to map to toggle comments in vim?

4 Answers4

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