add missing configs

nvim/.config/nvim/lua/custom/configs/lspconfig.lua

@@ -0,0 +1,22 @@
+local on_attach = require("plugins.configs.lspconfig").on_attach
+local capabilities = require("plugins.configs.lspconfig").capabilities
+
+local lspconfig = require("lspconfig")
+local util = require "lspconfig/util"
+
+lspconfig.gopls.setup {
+  on_attach = on_attach,
+  capabilities = capabilities,
+  cmd = {"gopls"},
+  filetypes = { "go", "gomod", "gowork", "gotmpl" },
+  root_dir = util.root_pattern("go.work", "go.mod", ".git"),
+  settings = {
+    gopls = {
+      completeUnimported = true,
+      usePlaceholders = true,
+      analyses = {
+        unusedparams = true
+      }
+    }
+  }
+}

nvim/.config/nvim/lua/custom/configs/null-ls.lua

@@ -0,0 +1,26 @@
+local null_ls = require("null-ls")
+local augroup = vim.api.nvim_create_augroup("LspFormatting", {})
+
+local opts = {
+  sources = {
+    null_ls.builtins.formatting.gofumpt,
+    null_ls.builtins.formatting.goimports_reviser,
+    null_ls.builtins.formatting.golines
+  },
+  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