YouCompleteMe in non-code files yields -- User defined completion (^U^N^P) Pattern not found

Question

I use YouCompleteMe and it works great (after some setting up woes) for both C/C++ and Python code. However, it tries to complete things in text files such as ReStructured text, markdown, etc...

The error I keep getting is:

-- User defined completion (^U^N^P) Pattern not found

How can I stop it form doing so?

I did try this:

autocmd FileType c,cpp,python let g:ycm_global_ycm_extra_conf = "~/.ycm_extra_conf.py"
autocmd FileType c,cpp,python let g:ycm_collect_identifiers_from_tags_files = 1
autocmd FileType c,cpp,python let g:ycm_complete_in_comments = 0
autocmd FileType c,cpp,python let g:ycm_complete_in_strings = 0
autocmd FileType c,cpp,python let g:syntastic_enable_signs=1
autocmd FileType c,cpp,python let g:syntastic_error_symbol = '✗'
autocmd FileType c,cpp,python let g:syntastic_warning_symbol = '⚠'
autocmd FileType c,cpp,python let g:ycm_confirm_extra_conf = 0

But the error still persists. I even tried adding a g:ycm_filetype_specific_completion_to_disable command like so:

let g:ycm_filetype_specific_completion_to_disable = {
      \ 'rst': 1
      \}

But the error still persists.

Answer 1

The command g:ycm_filetype_whitelist was the one I needed!

let g:ycm_filetype_whitelist = { 'cpp': 1, 'c': 1, 'python':1 }

Finally, to get ride of this message altogether, the answer is in the FAQ. Basically, update to Vim 7.4.314 or later and it shall go away.

Answer 2

This would be a generic answer, since I don't know YouCompleteMe. You mentioned in the comments that you would be ok with enabling this plugin on a per-file basis, so here is the solution:

autocmd FileType c,cpp <command>

The command above executes command whenever a c or cpp filetype is detected. If you have filetype detection enabled on startup, this means the command would execute when you open a c or cpp file. Furthermore, remember that the effect may be on all opened splits (see set vs setlocal). :h autocmd and :h filetypes have additional information.

That said, you need to find the command that enables/disables YouCompleteMe and stick it in an autocommand.