nvim: Update lsp lua configuration

Uses arch aur-packaged installation of sumneko_lua, and invokes it for
any lua file.
Takes care of some additional configuration to enable easier programming
for neovim itself.

bootstrap/packages.txt

@@ -54,6 +54,8 @@ linux-lts-headers
 littler
 logrotate
 lscolors-git
+lua-format
+lua-language-server
 lvm2
 lynx
 maim

nvim/.config/nvim/lua/nvim-lspconfig/init.lua

@@ -30,14 +30,31 @@ require'lspconfig'.bashls.setup {on_attach = on_attach}
 require'lspconfig'.gopls.setup {on_attach = on_attach}
 require'lspconfig'.texlab.setup {on_attach = on_attach}
 
--- To get builtin LSP running, do something like:
--- NOTE: This replaces the calls where you would have before done `require('nvim_lsp').sumneko_lua.setup()`
-require('nlua.lsp.nvim').setup(require('lspconfig'), {
-    on_attach = on_attach,
-
-    -- Include globals you want to tell the LSP are real :)
-    globals = {
-        -- Colorbuddy
-        "Color", "c", "Group", "g", "s"
-    }
-})
+-- requires the lua-language-server package to be installed 
+-- The arch package defaults to the following directory
+local sumneko_root_path = "/usr/share/lua-language-server"
+require'lspconfig'.sumneko_lua.setup {
+  cmd = { "lua-language-server", "-E", sumneko_root_path .. "/main.lua"};
+  settings = {
+    Lua = {
+      runtime = {
+        -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
+        version = 'LuaJIT',
+        -- Setup your lua path
+        path = vim.split(package.path, ';'),
+      },
+      diagnostics = {
+        -- Get the language server to recognize the `vim` global
+        globals = {'vim'},
+      },
+      workspace = {
+        -- Make the server aware of Neovim runtime files
+        library = {
+          [vim.fn.expand('$VIMRUNTIME/lua')] = true,
+          [vim.fn.expand('$VIMRUNTIME/lua/vim/lsp')] = true,
+        },
+      },
+    },
+  },
+  on_attach = on_attach,
+}

nvim/.config/nvim/plugins.vim

@@ -70,7 +70,6 @@ Plug 'reedes/vim-textobj-sentence'
 Plug 'junegunn/goyo.vim', { 'for': ['pandoc', 'markdown', 'txt'], 'on': 'Goyo' }      " provide distraction free writing
 Plug 'junegunn/limelight.vim', { 'for': ['pandoc', 'markdown', 'txt'], 'on': 'Goyo' } " provide even distraction free-er writing (lowlight paragraphs)
                                                                                       " Language Integration
-Plug 'tjdevries/nlua.nvim'                                                            " lua lsp integration
 Plug 'euclidianAce/BetterLua.vim'                                                     " better syntax highlighting for lua
 Plug 'sheerun/vim-polyglot'                                                           " syntax plugins for almost every language
 Plug 'stephpy/vim-yaml'