nvim: lsp: add lua-language-server support

.config/nvim/lua/completion.lua

@@ -11,6 +11,9 @@ packer.use {
     requires = 'https://github.com/neovim/nvim-lspconfig',
     config = function()
         local cmp = require'cmp'
+        if (cmp == nil) then
+            return
+        end
         cmp.setup({
             snippet = {
                 expand = function(args)
@@ -71,6 +74,9 @@ packer.use {
         require('lspconfig')['clangd'].setup {
             capabilities = capabilities
         }
+        require('lspconfig')['sumneko_lua'].setup {
+            capabilities = capabilities
+        }
 
         cmp.setup.filetype('lua', {
             sources = cmp.config.sources({

.config/nvim/lua/lsp.lua

@@ -68,5 +68,25 @@ packer.use {
             },
             on_attach = on_attach
         }
+
+        require'lspconfig'.sumneko_lua.setup {
+            settings = {
+                Lua = {
+                    runtime = {
+                        version = 'LuaJIT',
+                    },
+                    diagnostics = {
+                        globals = {'vim'},
+                    },
+                    workspace = {
+                        library = vim.api.nvim_get_runtime_file("", true),
+                    },
+                    telemetry = {
+                        enable = false,
+                    },
+                },
+            },
+            on_attach = on_attach
+        }
     end
 }