nvim: remove dart, move autoformat extensions to var

dotfiles/.config/nvim/lua/lsp.lua

@@ -1,3 +1,5 @@
+local autoformat_files = '*.py,*.rs,*.tf'
+
 local common_on_attach = function(client, bufnr)
     -- Mappings.
     vim.keymap.set("n", "K", "<Cmd>lua vim.lsp.buf.hover()<CR>")
@@ -12,7 +14,7 @@ local common_on_attach = function(client, bufnr)
     -- Autoformat on save.
     if client.supports_method("textDocument/formatting") then
         vim.api.nvim_create_autocmd("BufWritePre", {
-            pattern = '*.py,*.rs',
+            pattern = autoformat_files,
             callback = function()
                 vim.lsp.buf.format()
             end,
@@ -32,7 +34,6 @@ local capabilities = vim.lsp.protocol.make_client_capabilities()
 -- LSPs
 local servers = {
     "clangd",
-    "dartls",
     "gleam",
     "lua_ls",
     "ocamllsp",