go: add gopls

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/7131f3c223a2d799568e4b278380cd9dac2b8579' (2023-10-04)
  → 'github:NixOS/nixpkgs/75a52265bda7fd25e06e3a67dee3f0354e73243c' (2023-10-25)

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1688646010,
-        "narHash": "sha256-kCeza5eKI2NEi8k0EoeZfv3lN1r1Vwx+L/VA6I8tmG4=",
+        "lastModified": 1698266953,
+        "narHash": "sha256-jf72t7pC8+8h8fUslUYbWTX5rKsRwOzRMX8jJsGqDXA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5daaa32204e9c46b05cd709218b7ba733d07e80c",
+        "rev": "75a52265bda7fd25e06e3a67dee3f0354e73243c",
         "type": "github"
       },
       "original": {

nvim-lsp.nix

@@ -11,6 +11,7 @@
         (nvim-treesitter.withPlugins (parsers: [
           parsers.c
           parsers.cpp
+	  parsers.go
           parsers.json
           parsers.latex
           parsers.lua
@@ -30,6 +31,7 @@
         colorizer
         fugitive
         fzf-lua
+	gopls
         gruvbox
         nvim-cmp
         nvim-lspconfig

vimrc.lua

@@ -1,22 +1,30 @@
 -- Basic settings
 vim.g.loaded_matchparen = true
 vim.g.netrw_liststyle = 3
-vim.go.background = 'dark'
-vim.go.belloff = 'all'
-vim.go.breakindent = true
-vim.go.hlsearch = false
-vim.go.laststatus = 0
-vim.go.lazyredraw = true
-vim.go.showcmd = true
-vim.go.synmaxcol = 800
-vim.go.syntax = 'on'
-vim.go.termguicolors = true
-vim.go.titleold = vim.fn.getcwd()
-vim.go.title = true
-vim.go.wildmenu = true
-vim.go.wrap = true
 vim.wo.number = true
 
+local glob_opts = {
+	background = 'dark',
+	belloff = 'all',
+	breakindent = true,
+	hlsearch = false,
+	laststatus = 0,
+	lazyredraw = true,
+	showcmd = true,
+	synmaxcol = 800,
+	syntax = 'on',
+	termguicolors = true,
+	titleold = vim.fn.getcwd(),
+	title = true,
+	wildmenu = true,
+	wrap = true,
+}
+
+for option, value in pairs(glob_opts) do
+	vim.go[option] = value
+end
+
+
 vim.cmd([[colorscheme gruvbox]])
 
 require 'nvim-treesitter.configs'.setup {
@@ -99,6 +107,19 @@ vim.api.nvim_create_autocmd('LspAttach', {
 	end
 })
 
+vim.diagnostic.config({ virtual_text = false}) -- Turn off inline diagnostics 
+
+-- Show all diagnostics on current line in floating window
+vim.api.nvim_set_keymap( 'n', '<Leader>d', ':lua vim.diagnostic.open_float()<CR>', opts)
+
+-- Go to next diagnostic (if there are multiple on the same line, only shows
+-- one at a time in the floating window)
+vim.api.nvim_set_keymap( 'n', '<Leader>n', ':lua vim.diagnostic.goto_next()<CR>', opts)
+
+-- Go to prev diagnostic (if there are multiple on the same line, only shows
+-- one at a time in the floating window)
+vim.api.nvim_set_keymap( 'n', '<Leader>p', ':lua vim.diagnostic.goto_prev()<CR>', opts)
+
 -- Use a loop to conveniently call 'setup' on multiple servers and
 -- map buffer local keybindings when the language server attaches
 local cmp = require 'cmp'
@@ -163,7 +184,7 @@ cmp.setup({
 	}
 })
 
-local servers = { 'pyright', 'rust_analyzer', 'ccls', 'lua_ls', 'nixd', 'texlab', 'verible' }
+local servers = { 'pyright', 'rust_analyzer', 'ccls', 'nixd', 'texlab', 'zls', 'gopls' }
 local capabilities = require('cmp_nvim_lsp').default_capabilities()
 for _, lsp in pairs(servers) do
 	require('lspconfig')[lsp].setup {
@@ -172,10 +193,32 @@ for _, lsp in pairs(servers) do
 end
 
 require('lspconfig').lua_ls.setup({
+	capabilities = capabilities,
 	single_file_support = true,
+	settings = {
+		Lua = {
+			diagnostics = {
+				globals = { 'vim' },
+			},
+			runtime = {
+				version = 'LuaJIT',
+				path = vim.split(package.path, ';'),
+			},
+			workspace = {
+				library = {
+					[vim.fn.expand('$VIMRUNTIME/lua')] = true,
+					[vim.fn.expand('$VIMRUNTIME/lua/vim/lsp')] = true,
+				},
+			},
+			telemetry = {
+				enable = false,
+			},
+		},
+	},
 })
 
 require('lspconfig').verible.setup({
+	capabilities = capabilities,
 	root_dir = function() return vim.loop.cwd() end
 })