fix(lsp): fix lsp support in nvim

Use LanguageClient-neovim for old neovim

autoload/SpaceVim/layers/lsp.vim

@@ -86,12 +86,12 @@ function! SpaceVim#layers#lsp#plugins() abort
     endif
   elseif SpaceVim#layers#isLoaded('autocomplete') && get(g:, 'spacevim_autocomplete_method') ==# 'coc'
     " nop
-  elseif has('nvim-0.4.3')
-    " use neovim build-in lsp
-  elseif has('nvim')
+  elseif has('nvim-0.4.3') && $ENABLE_NVIM043LSP
     call add(plugins, ['bfredl/nvim-lspmirror', {'merged' : 0}])
     call add(plugins, ['bfredl/nvim-lspext', {'merged' : 0}])
-    call add(plugins, ['shougo/deoplete-lsp', {'merged' : 0}])
+  elseif has('nvim')
+    call add(plugins, ['autozimu/LanguageClient-neovim',
+          \ { 'merged': 0, 'if': has('python3'), 'build' : 'bash install.sh' }])
   else
     call add(plugins, ['prabirshrestha/async.vim', {'merged' : 0}])
     call add(plugins, ['prabirshrestha/vim-lsp', {'merged' : 0}])

autoload/SpaceVim/logger.vim

@@ -6,7 +6,7 @@
 " License: GPLv3
 "=============================================================================
 
-if $SPACEVIM_LUA && has('nvim')
+if $SPACEVIM_LUA && has('nvim-0.5.0')
   function! SpaceVim#logger#info(msg) abort
     lua require("spacevim.logger").info(
           \ require("spacevim").eval("a:msg")

autoload/SpaceVim/lsp.vim

@@ -151,7 +151,7 @@ elseif SpaceVim#layers#isLoaded('autocomplete') && get(g:, 'spacevim_autocomplet
   function! SpaceVim#lsp#references() abort
     call CocAction('jumpReferences')
   endfunction
-elseif has('nvim-0.4.3')
+elseif has('nvim-0.4.3') && $ENABLE_NVIM043LSP
   function! SpaceVim#lsp#show_doc() abort
     lua require('lsp.plugin')
           \ .client.request('textDocument/hover',
@@ -191,6 +191,46 @@ elseif has('nvim-0.4.3')
     " @todo languageclient do not support refactor
   endfunction
 elseif has('nvim')
+  " use LanguageClient-neovim
+  function! SpaceVim#lsp#reg_server(ft, cmds) abort
+    let g:LanguageClient_serverCommands[a:ft] = copy(a:cmds)
+  endfunction
+
+  function! SpaceVim#lsp#show_doc() abort
+    call LanguageClient_textDocument_hover()
+  endfunction
+
+  function! SpaceVim#lsp#go_to_def() abort
+    call LanguageClient_textDocument_definition()
+  endfunction
+
+  function! SpaceVim#lsp#go_to_typedef() abort
+    call LanguageClient_textDocument_typeDefinition()
+  endfunction
+
+  function! SpaceVim#lsp#go_to_impl() abort
+    call LanguageClient_textDocument_implementation()
+  endfunction
+
+  function! SpaceVim#lsp#rename() abort
+    call LanguageClient_textDocument_rename()
+  endfunction
+
+  function! SpaceVim#lsp#references() abort
+    call LanguageClient_textDocument_references()
+  endfunction
+
+  function! SpaceVim#lsp#go_to_declaration() abort
+    call LanguageClient_textDocument_declaration()
+  endfunction
+
+  function! SpaceVim#lsp#documentSymbol()
+    call LanguageClient_textDocument_documentSymbol()
+  endfunction
+
+  function! SpaceVim#lsp#refactor() abort
+    " @todo languageclient do not support refactor
+  endfunction
 else
   " use vim-lsp
   function! SpaceVim#lsp#reg_server(ft, cmds) abort

autoload/SpaceVim/plugins/a.vim

@@ -11,7 +11,7 @@ set cpo&vim
 scriptencoding utf-8
 
 
-if $SPACEVIM_LUA && has('nvim')
+if $SPACEVIM_LUA && has('nvim-0.5.0')
   function! SpaceVim#plugins#a#alt(request_parse, ...) abort
     lua require("spacevim.plugin.a").alt(
           \ require("spacevim").eval("a:request_parse"),

autoload/SpaceVim/plugins/projectmanager.vim

@@ -8,7 +8,7 @@
 
 
 
-if $SPACEVIM_LUA && has('nvim')
+if $SPACEVIM_LUA && has('nvim-0.5.0')
   function! SpaceVim#plugins#projectmanager#complete_project(ArgLead, CmdLine, CursorPos) abort
     return luaeval('require("spacevim.plugin.projectmanager").complete('
           \ .'require("spacevim").eval("a:ArgLead"),'