Configure LSP for C

after/ftplugin/c.vim

@@ -7,3 +7,19 @@ let g:ale_c_clangformat_options = '-style=file'
 
 let g:ycm_goto_buffer_command = 'same-buffer'
 
+nnoremap <F3> :call LanguageClient_contextMenu()<CR>
+nnoremap <silent> <F4> :call LanguageClient#textDocument_definition()<CR>
+nnoremap <silent> <F7> :call LanguageClient#textDocument_hover()<CR>
+nnoremap <silent> <F6> :call LanguageClient#textDocument_rename()<CR>
+
+let g:LanguageClient_autoStart = 1
+
+let g:LanguageClient_serverCommands = {
+    \ 'c': ['cquery', '--language-server', '--log-file=/tmp/cq.log'],
+    \ }
+
+let g:LanguageClient_rootMarkers = {
+	\ 'c': ['.cquery', 'compile_commands.json', 'build'],
+	\ }
+
+let g:LanguageClient_settingsPath = $HOME.'/.vim/cquery.json'

cquery.json

@@ -0,0 +1,5 @@
+{
+        "initializationOptions": {
+                "cacheDirectory": "/tmp/cquery"
+        }
+}