add gopls please

native_configs/neovim/init.lua

@@ -957,6 +957,45 @@ local setup = {
       },
     }
   end,
+  ["gopls"] = function()
+    local util = require 'lspconfig.util'
+    local mod_cache = nil
+
+    return {
+      default_config = {
+        -- NOTE: might just change to `nix run nixpkgs#gopls` for simplicity here
+        cmd = { 'gopls' },
+        filetypes = { 'go', 'gomod', 'gowork', 'gotmpl' },
+        root_dir = function(fname)
+          -- see: https://github.com/neovim/nvim-lspconfig/issues/804
+          if not mod_cache then
+            local result = util.async_run_command 'go env GOMODCACHE'
+            if result and result[1] then
+              mod_cache = vim.trim(result[1])
+            end
+          end
+          if fname:sub(1, #mod_cache) == mod_cache then
+            local clients = vim.lsp.get_active_clients { name = 'gopls' }
+            if #clients > 0 then
+              return clients[#clients].config.root_dir
+            end
+          end
+          return util.root_pattern('go.work', 'go.mod', '.git')(fname)
+        end,
+        single_file_support = true,
+      },
+      docs = {
+        description = [[
+https://github.com/golang/tools/tree/master/gopls
+
+Google's lsp server for golang.
+]],
+        default_config = {
+          root_dir = [[root_pattern("go.work", "go.mod", ".git")]],
+        },
+      },
+    }
+  end
 }
 
 require('mason-lspconfig').setup_handlers({