How to toggle comment visual line selection

I am trying to add a keybinding for <C-/> that allows me to toggle comments for any number of lines in visual line mode. Here’s what I tried:

function! g:toggleComment()
	normal! gv
	let startline = line("v")
	let endline = line(".")
	call VSCodeNotifyRange('editor.action.commentLine', startline, endline, 1)
endfunction

vnoremap <C-/> :call g:toggleComment()<cr>

But nothing happens when I press <C-/>. I have added && neovim.mode != ‘visual’ to the when expression of the existing vscode keybinding of <C-/>.

[ian-h-chamberlain]

@claudiodsf I was able to create a keybind like this for macOS in my VSCode keybindings.json:

    {
        "key": "cmd+/",
        "command": "vscode-neovim.send",
        "when": "editorTextFocus && neovim.init",
        "args": "<C-/>"
    },

For the benefit of anyone else coming to this issue, I finally figured the solution to another problem that was bothering me – the de-selection of the commented lines after toggling. The following restores the visual selection after <C-/>, which allows you to toggle on and off the selected lines without re-selecting them. This matches the behavior I was used to coming from VscodeVim.

.vimrc / init.vim:

if exists('g:vscode')
    xmap <C-/> <Plug>VSCodeCommentarygv
    nmap <C-/> <Plug>VSCodeCommentaryLinegv
endif

Based on this Stackoverflow it seems like there is a common practice to name <Plug> bindings with parentheses, which would make these binds slightly more clear to read, e.g.

    xmap <C-/> <Plug>(VSCodeCommentary)gv
    nmap <C-/> <Plug>(VSCodeCommentaryLine)gv

This would be a trivial change to vscode-code-actions.vim. if the maintainers are interested in supporting configuration like this I’d be happy to open a PR adding the parenthesized names while keeping the old ones for backwards compatibility.

Edit: actually I really only want this behavior in visual mode so I ended up with:

    xmap <C-/> <Plug>VSCodeCommentarygv
    nmap <C-/> <Plug>VSCodeCommentaryLine

[jukrb0x]

@claudiodsf I was able to create a keybind like this for macOS in my VSCode keybindings.json:

    {
        "key": "cmd+/",
        "command": "vscode-neovim.send",
        "when": "editorTextFocus && neovim.init",
        "args": "<C-/>"
    },

For the benefit of anyone else coming to this issue, I finally figured the solution to another problem that was bothering me – the de-selection of the commented lines after toggling. The following restores the visual selection after <C-/>, which allows you to toggle on and off the selected lines without re-selecting them. This matches the behavior I was used to coming from VscodeVim.

.vimrc / init.vim:

if exists('g:vscode')
    xmap <C-/> <Plug>VSCodeCommentarygv
    nmap <C-/> <Plug>VSCodeCommentaryLinegv
endif

Based on this Stackoverflow it seems like there is a common practice to name <Plug> bindings with parentheses, which would make these binds slightly more clear to read, e.g.

    xmap <C-/> <Plug>(VSCodeCommentary)gv
    nmap <C-/> <Plug>(VSCodeCommentaryLine)gv

This would be a trivial change to vscode-code-actions.vim. if the maintainers are interested in supporting configuration like this I’d be happy to open a PR adding the parenthesized names while keeping the old ones for backwards compatibility.

Edit: actually I really only want this behavior in visual mode so I ended up with:

    xmap <C-/> <Plug>VSCodeCommentarygv
    nmap <C-/> <Plug>VSCodeCommentaryLine

This works great, I would suggest to add one more condition neovim.mode == visual

  {
    "key": "cmd+/",
    "command": "vscode-neovim.send",
    "when": "editorTextFocus && neovim.init && neovim.mode == visual",
    "args": "<C-/>"
  }

so that it would also perfectly work in insert mode with vscode.