improve folding

lua/znvim/plugins/editor.lua

@@ -242,7 +242,27 @@ return {
             "https://github.com/kevinhwang91/promise-async",
         },
         event = "BufReadPost",
-        config = true,
+        keys = {
+            {
+                "zR",
+                function ()
+                    require('ufo').openAllFolds()
+                end,
+                desc = "Open all folds"
+            },
+            {
+                "zM",
+                function ()
+                    require('ufo').closeAllFolds()
+                end,
+                desc = "Close all folds"
+            },
+        },
+        config = {
+            provider_selector = function(bufnr, filetype, buftype)
+                return {'treesitter', 'indent'}
+            end
+        },
     },
     { -- rainbow delimiters
         "https://gitlab.com/HiPhish/rainbow-delimiters.nvim",