[vim] Add YouCompleteMe

vimrc

@@ -18,6 +18,20 @@ if has("unix") || has("mac")
     Plugin 'gmarik/Vundle.vim'
     map <F3> :VundleUpdate<CR>
     Plugin 'dag/vim-fish'
+    if isdirectory(expand("$HOME/.vim/bundle/YouCompleteMe"))
+        "[Workaround for YCM non-portability]"
+        Plugin 'Valloric/YouCompleteMe'
+        let g:ycm_global_ycm_extra_conf = expand("$HOME/.vim/ycm_global_conf.py")
+        let g:ycm_extra_conf_vim_data =[ "&filetype" ]
+        "[We're using ale for linting]"
+        let g:ycm_show_diagnostics_ui = 0
+        let g:ycm_collect_identifiers_from_tags_files=1
+        let g:ycm_seed_identifiers_with_syntax=1
+        let g:ycm_show_diagnostics_ui = 0
+        let g:ycm_use_ultisnips_completer = 0
+    else
+        Plugin 'AutoComplPop'
+    endif
     Plugin 'w0rp/ale'
     let g:ale_linters = {
         \ 'cpp': ['g++'],