nvim: Only start ltex LSP if spellchecking enabled

Since ltex-lsp eats quite a lot of resources and takes a while to start
up we don't always want it enabled for every prose file. This commit
ensures that it only starts up when spellchecking is enabled for a
buffer (through the custom user command `SpellToggle`).

nvim/.config/nvim/lazy-lock.json

@@ -39,6 +39,7 @@
   "jupytext.nvim": { "branch": "main", "commit": "c8baf3ad344c59b3abd461ecc17fc16ec44d0f7b" },
   "lazy.nvim": { "branch": "main", "commit": "c501b429cf995c645454539b924aaefae45bb9eb" },
   "lsp-setup.nvim": { "branch": "main", "commit": "6e4e977512ce426d8b52c27f3b6e6aefc73e1452" },
+  "ltex_extra.nvim": { "branch": "dev", "commit": "57192d7ae5ba8cef3c10e90f2cd62d4a7cdaab69" },
   "lualine.nvim": { "branch": "master", "commit": "0a5a66803c7407767b799067986b4dc3036e1983" },
   "luarocks.nvim": { "branch": "main", "commit": "1db9093915eb16ba2473cfb8d343ace5ee04130a" },
   "markmap.nvim": { "branch": "main", "commit": "5fb6755cf5434511cc23a4936c9eb76b9142fba5" },

nvim/.config/nvim/lua/plugins/config/lsp.lua

@@ -20,7 +20,7 @@ local servers = {
 	eslint = {},
 	gopls = {},
 	julials = {},
-	ltex = {},
+	ltex = { autostart = false },
 	lua_ls = {
 		settings = {
 			Lua = {
@@ -201,3 +201,23 @@ if require("core.util").is_available("arduino") then
 		on_new_config = require("arduino").on_new_config,
 	})
 end
+
+vim.api.nvim_create_autocmd("User", {
+	pattern = "SpellEnable",
+	callback = function()
+		lspconfig.ltex.setup({
+			on_attach = function(client, bufnr)
+				on_attach(client, bufnr)
+				if require("core.util").is_available("ltex_extra") then
+					require("ltex_extra").setup()
+				end
+			end,
+			settings = {
+				ltex = {
+					language = vim.opt.spelllang:get(),
+				},
+			},
+		})
+		vim.cmd("LspStart ltex")
+	end,
+})

nvim/.config/nvim/lua/plugins/prose.lua

@@ -182,8 +182,6 @@ local prose_plugs = {
 	{
 		"barreiroleo/ltex_extra.nvim",
 		branch = "dev",
-		ft = writing_ft,
-		opts = {},
 	},
 }