[LazyVim] Configure UFO for better folding

Thanks to
kevinhwang91/nvim-ufo#4 (comment)

LazyVim/lua/config/keymaps.lua

@@ -106,3 +106,10 @@ map("n", "<leader>Ww", "<C-W>p", { desc = "Other window" })
 map("n", "<leader>Wd", "<C-W>c", { desc = "Delete window" })
 map("n", "<leader>W-", "<C-W>s", { desc = "Split window below" })
 map("n", "<leader>W|", "<C-W>v", { desc = "Split window right" })
+
+-- Improved Code Folding
+map("n", "zR", require("ufo").openAllFolds, { desc = "Open all folds" })
+map("n", "zM", require("ufo").closeAllFolds, { desc = "Close all folds" })
+map("n", "zr", require("ufo").openFoldsExceptKinds, { desc = "Fold less" })
+map("n", "zm", require("ufo").closeFoldsWith, { desc = "Fold more" })
+map("n", "zp", require("ufo").peekFoldedLinesUnderCursor, { desc = "Peek fold" })

LazyVim/lua/config/options.lua

@@ -6,6 +6,12 @@ local opt = vim.opt
 
 opt.clipboard = ""
 
+opt.foldenable = true -- enable fold for nvim-ufo
+opt.foldlevel = 99 -- set high foldlevel for nvim-ufo
+opt.foldlevelstart = 99 -- start with all code unfolded
+opt.foldcolumn = "1"
+vim.o.fillchars = [[eob: ,fold: ,foldopen:,foldsep: ,foldclose:]]
+
 -- VimWiki options
 vim.cmd([[
   let g:vimwiki_list = [{'path': '~/vimwiki/', 'syntax': 'markdown', 'ext': '.md'}]

LazyVim/lua/plugins/ufo.lua

@@ -0,0 +1,25 @@
+return {
+	"kevinhwang91/nvim-ufo",
+	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,
+		},
+	},
+	opts = {
+		provider_selector = function(bufnr, filetype, buftype)
+			return { "treesitter", "indent" }
+		end,
+	},
+}