toggle_comments.vim

highlight default NonComment ctermfg=8 ctermbg=none cterm=none guifg=#333333 guibg=none gui=none

function! s:toggle_comments() abort
  if exists('w:toggle_comments')
    silent! call matchdelete(w:toggle_comments)
    unlet! w:toggle_comments
  else
    let w:toggle_comments = matchadd('NonComment', '^\%(\s*'.split(escape(&commentstring, '^$.*/"'''), '%s')[0].'\)\@!.*')
  endif
endfunction

nnoremap <leader>c :<c-u>call <sid>toggle_comments()<cr>