feat: isolate nvim config

src/lua/configs/null-ls.lua

@@ -0,0 +1,40 @@
+local augroup = vim.api.nvim_create_augroup("LspFormatting", {})
+local null_ls = require("null-ls")
+
+local b = null_ls.builtins
+
+local opts = {
+  sources = {
+    b.formatting.prettierd,
+    b.formatting.stylua,
+
+    -- nix
+    b.code_actions.statix,
+    b.formatting.alejandra,
+    b.diagnostics.deadnix,
+
+    -- go
+    b.code_actions.gomodifytags,
+    b.code_actions.impl,
+    b.formatting.gofumpt,
+    b.formatting.goimports,
+    b.diagnostics.staticcheck,
+  },
+  on_attach = function(client, bufnr)
+    if client.supports_method("textDocument/formatting") then
+      vim.api.nvim_clear_autocmds({
+        group = augroup,
+        buffer = bufnr,
+      })
+      vim.api.nvim_create_autocmd("BufWritePre", {
+        group = augroup,
+        buffer = bufnr,
+        callback = function()
+          vim.lsp.buf.format({ bufnr = bufnr })
+        end,
+      })
+    end
+  end,
+}
+
+return opts