Add nvim-ufo

kevinhwang91/nvim-ufo#4 (comment)

lua/custom/plugins/nvim-ufo.lua

@@ -0,0 +1,47 @@
+return {
+  {
+    'kevinhwang91/nvim-ufo',
+    event = 'BufRead',
+    dependencies = {
+      'kevinhwang91/promise-async',
+      {
+        'luukvbaal/statuscol.nvim',
+        config = function()
+          local builtin = require 'statuscol.builtin'
+          require('statuscol').setup {
+            relculright = true,
+            segments = {
+              { text = { builtin.foldfunc }, click = 'v:lua.ScFa' },
+              { text = { '%s' }, click = 'v:lua.ScSa' },
+              { text = { builtin.lnumfunc, ' ' }, click = 'v:lua.ScLa' },
+            },
+          }
+        end,
+      },
+    },
+    config = function()
+      -- default settings to enable
+      vim.o.foldcolumn = '1'
+      vim.o.foldlevel = 99
+      vim.o.foldlevelstart = 99
+      vim.o.foldenable = true
+      vim.o.fillchars = [[eob: ,fold: ,foldopen:,foldsep: ,foldclose:]]
+
+      -- setup folding source: first lsp, then indent as fallback
+      require('ufo').setup {
+        provider_selector = function()
+          return { 'treesitter', 'indent' }
+        end,
+      }
+
+      -- remap keys for "fold all" and "unfold all"
+      vim.keymap.set('n', 'zR', require('ufo').openAllFolds, { desc = 'Open all folds' })
+      vim.keymap.set('n', 'zM', require('ufo').closeAllFolds, { desc = 'Close all folds' })
+    end,
+  },
+  -- Folding preview, by default h and l keys are used.
+  -- On first press of h key, when cursor is on a closed fold, the preview will be shown.
+  -- On second press the preview will be closed and fold will be opened.
+  -- When preview is opened, the l key will close it and open fold. In all other cases these keys will work as usual.
+  { 'anuvyklack/fold-preview.nvim', dependencies = 'anuvyklack/keymap-amend.nvim', config = true },
+}