Using the YouCompleteMe plugin, I'd like to be able to move my cursor over e.g. a function in all supported languages (e.g. JS), and use some keybinding to toggle the information dialog on/off. (At the moment, I have to wait a few seconds for the box to show; I'd prefer to control it explicitly).

Is this possible?

  • It could be that setting updatetime smaller would help; not manual, though
    – D. Ben Knoble
    Nov 19, 2020 at 14:56

2 Answers 2


Add to your config:

nmap <silent> <leader>h <plug>(YCMHover)

I prefer K for that, but only for buffers/filetypes, where it makes sense:

let s:lsp_ft_maps = 'gdscript,go,python'

augroup ycm_settings | au!
    exe printf('au FileType %s call Ycm_mappings()', s:lsp_ft_maps)
augroup end

func! Ycm_mappings() abort
    nmap <silent><buffer> K <plug>(YCMHover)
    nnoremap <silent><buffer> gd :YcmCompleter GoTo<CR>


This snippet creates an autocommand for filetypes listed in s:lsp_ft_maps that runs Ycm_mappings() function, that in turn creates buffer local mappings.

Buffer local mappings as name suggests are only available for a given buffer thus if you switch to another buffer where YCM doesn't have LSP functionality, original mappings would be in effect.

For example, K is used by vim to show a man page of a keyword under cursor, and for vim filetype (say your .vimrc), the same K is used to show vim help. With the snippet, it is preserved for non-lsp related buffers and shows YCM hover for buffers listed in s:lsp_ft_maps variable.

The same is with gd mapping -- it has original built-in functionality which this snippet overrides for some of filetypes.

  • Thanks. The first line seems to do what I want. I don't understand the rest of what you've written though. Could you please clarify?
    – Magnus
    Nov 19, 2020 at 22:01
  • @Magnus see update. But if the first line works for you, don't bother :)
    – Maxim Kim
    Nov 20, 2020 at 7:34

You could also do the following:

" turn off hover info
let g:ycm_auto_hover = ''

" toggle hover info with F3
map <F3> <plug>(YCMHover)

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