Use vim-lsp

after/plugin/plugin_settings.vim

@@ -178,9 +178,39 @@ autocmd VimEnter * if argc() == 1 && isdirectory(argv()[0]) && !exists("s:std_in
 let g:EditorConfig_max_line_indicator = 'none'
 " let g:EditorConfig_preserve_formatoptions = 1
 
+
 " vim current word
 let g:vim_current_word#highlight_current_word = 0
 hi default link CurrentWordTwins CursorColumn
 
+
 " vista
 let g:vista#renderer#enable_icon = 0
+
+
+" vim-lsp
+function! s:on_lsp_buffer_enabled() abort
+    setlocal omnifunc=lsp#complete
+    setlocal signcolumn=yes
+    if exists('+tagfunc') | setlocal tagfunc=lsp#tagfunc | endif
+    nmap <buffer> gd <plug>(lsp-definition)
+    nmap <buffer> gr <plug>(lsp-references)
+    nmap <buffer> gi <plug>(lsp-implementation)
+    nmap <buffer> gt <plug>(lsp-type-definition)
+    nmap <buffer> <leader>rn <plug>(lsp-rename)
+    nmap <buffer> [g <Plug>(lsp-previous-diagnostic)
+    nmap <buffer> ]g <Plug>(lsp-next-diagnostic)
+    nmap <buffer> K <plug>(lsp-hover)
+
+    " refer to doc to add more commands
+endfunction
+
+augroup lsp_install
+    au!
+    " call s:on_lsp_buffer_enabled only for languages that has the server registered.
+    autocmd User lsp_buffer_enabled call s:on_lsp_buffer_enabled()
+augroup END
+
+let g:lsp_auto_enable = 0
+
+command -nargs=0 LspStart call lsp#activate()