Add nvm-ufo plugin to easy folding

lua/custom/plugins/ufo.lua

@@ -0,0 +1,32 @@
+return {
+  'kevinhwang91/nvim-ufo',
+  dependencies = 'kevinhwang91/promise-async',
+  config = function()
+    vim.o.foldcolumn = '1' -- '0' is not bad
+    vim.o.foldlevel = 99 -- Using ufo provider need a large value, feel free to decrease the value
+    vim.o.foldlevelstart = 99
+    vim.o.foldenable = true
+
+    -- Using ufo provider need remap `zR` and `zM`. If Neovim is 0.6.1, remap yourself
+    vim.keymap.set('n', 'zR', require('ufo').openAllFolds)
+    vim.keymap.set('n', 'zM', require('ufo').closeAllFolds)
+
+    -- Option 2: nvim lsp as LSP client
+    -- Tell the server the capability of foldingRange,
+    -- Neovim hasn't added foldingRange to default capabilities, users must add it manually
+    local capabilities = vim.lsp.protocol.make_client_capabilities()
+    capabilities.textDocument.foldingRange = {
+      dynamicRegistration = false,
+      lineFoldingOnly = true,
+    }
+    local language_servers = require('lspconfig').util.available_servers() -- or list servers manually like {'gopls', 'clangd'}
+    for _, ls in ipairs(language_servers) do
+      require('lspconfig')[ls].setup {
+        capabilities = capabilities,
+        -- you can add other fields for setting up lsp server in this table
+      }
+    end
+    require('ufo').setup()
+    --
+  end,
+}