F.A.Q

Here are some common problems that you may need to understand when working with coc.nvim.

Some highlight groups not work after colorscheme command?

Most color scheme clears existing highlights when loaded, make sure set your highlights with ColorScheme autocmd, like:

autocmd ColorScheme * call Highlight()

function! Highlight() abort
  hi Conceal ctermfg=239 guifg=#504945
  hi CocSearch ctermfg=12 guifg=#18A3FF
endfunction

And you have to use nested autocmd to make ColorScheme autocmd fired when using autocmd to change color scheme.

autocmd vimenter * ++nested colorscheme gruvbox

Can't get keywords completion items from other buffer.

The buffer source only provide keywords from buffers meet these conditions:

• Use bufloaded() function to check if a buffer is loaded.
• The buftype option should be empty, check it by :echo getbufvar(bufnr, "&buftype").

Environment node doesn't meet the requirement.

Use let g:coc_node_path = '/path/to/node' to make coc.nvim use custom node executable.

How could I use omnifunc option to trigger completion of coc.nvim?

You can't, there's no such function provided for omnifunc option, because vim's omnifunc always block and LSP features like triggerCharacters and incomplete response can't work.

If you want to manually trigger completion add "suggest.autoTrigger": "none", to coc-settings.json and bind a trigger key like:

  inoremap <silent><expr> <c-space> coc#refresh()

Note that some terminals send <NUL> when you press <c-space>, so you could use instead:

  inoremap <silent><expr> <NUL> coc#refresh()

My vim is blocked sometimes.

• Make sure you have set hidden in your .vimrc.
• Use CocActionAsync instead of CocAction in your autocmd, except for BufWritePre.
• Use CocRequestAsync instead of CocRequest when possible.

Language server doesn't work with unsaved buffer.

Some language servers don't work when the buffer not saved to disk. This is because they only tested on VSCode which always create file before create buffer.

Save the buffer to disk and restart coc.nvim server by :CocRestart to make the language server work.

Linting is slow.

By default, coc doesn't show diagnostics in UI when you're in insert mode, add "diagnostic.refreshOnInsertMode": true in settings file to enable refresh on insert mode.

Sign of diagnostics not shown.

If there are other signs that have higher offset, sign of coc.nvim can't be shown. You can change the offset of coc.nvim's signs by add "diagnostic.signOffset": 9999999 to your coc-settings.json to make it higher priority. The default value is 1000. You can also change the signcolumn option (available with latest neovim) like: set signcolumn=auto:2.

No completion triggered after type trigger character sometimes.

Some language servers can be slow for receiving document change before trigger completion. You can change the wait time for language server to finish the document change process before completion by changing suggest.triggerCompletionWait in your coc-settings.json, it's default to 50 in milliseconds.

My key-mapping is not working.

Some plugins like Ultisnips and vim-closer would remap your <tab> or <cr> without configuration. You can check out your key-mapping by command like :verbose imap <tab>.

How could I profile vim.

• Enter these commands:

  :profile start profile.log
  :profile func *
  :profile file *

• Make issue happen.
• Run command :profile stop (neovim only).
• Exit vim, and open the newly generated profile.log file in your current directory.

How could I profile coc.nvim.

To get the communication between vim and coc.nvim

• Add let g:node_client_debug = 1 in your vimrc.
• Restart vim and make issue happen.
• Use command :call coc#client#open_log() to open log file, or use :echo $NODE_CLIENT_LOG_FILE to get file path of log.

How to get log of coc.nvim?

Enable debug mode for coc in your terminal:

export NVIM_COC_LOG_LEVEL=debug

Open log file by command:

:CocOpenLog

How to show documentation of symbol under cursor, also known as cursor hover?

This is done by the doHover action. Configure a mapping like, e.g.:

nnoremap <silent> <leader>h :call CocActionAsync('doHover')<cr>

Cursor disappeared after exit CocList

Possible bug with guicursor option on your terminal, you can disable transparent cursor by

let g:coc_disable_transparent_cursor = 1

in your .vimrc.

Floating window position is wrong after scroll the screen.

It's expected since the float windows/popups are absolutely positioned.

How could I disable floating window?

• For documentation of completion, use "suggest.floatEnable": false in settings.json.
• For diagnostic messages, use "diagnostic.messageTarget": "echo" in settings.json.
• For signature help, use "signature.target": "echo" in settings.json.
• For documentation on hover, use "hover.target": "echo" in settings.json.

Highlight of background seems wrong with floating window.

The default highlight group linked by CocFloating could have reverse attribute, you will have colored background for some texts on that case, define your own CocFloating highlight group on that case.

hi link CocFloating Normal

How to scroll float window?

Checkout :h coc#float#has_scroll()

How to open link in float window?

Focus the window by <C-w>w if it's focusable on neovim and invoke :call CocAction('openlink')