feat(ufo): add config for nvim-ufo plugin

lvim/lua/plugins/init.lua

@@ -23,6 +23,66 @@ lvim.plugins = {
   },
   {
     'kevinhwang91/nvim-ufo',
+    opts = {
+      open_fold_hl_timeout = 400,
+      close_fold_kinds = { "imports", "comment" },
+      preview = {
+        win_config = {
+          border = { "", "─", "", "", "", "─", "", "" },
+          -- winhighlight = "Normal:Folded",
+          winblend = 0,
+        },
+        mappings = {
+          scrollU = "<C-u>",
+          scrollD = "<C-d>",
+          jumpTop = "[",
+          jumpBot = "]",
+        },
+      },
+    },
+    config = function(_, opts)
+      local handler = function(virtText, lnum, endLnum, width, truncate)
+        local newVirtText = {}
+        local totalLines = vim.api.nvim_buf_line_count(0)
+        local foldedLines = endLnum - lnum
+        local suffix = ("  %d %d%%"):format(foldedLines, foldedLines / totalLines * 100)
+        local sufWidth = vim.fn.strdisplaywidth(suffix)
+        local targetWidth = width - sufWidth
+        local curWidth = 0
+        for _, chunk in ipairs(virtText) do
+          local chunkText = chunk[1]
+          local chunkWidth = vim.fn.strdisplaywidth(chunkText)
+          if targetWidth > curWidth + chunkWidth then
+            table.insert(newVirtText, chunk)
+          else
+            chunkText = truncate(chunkText, targetWidth - curWidth)
+            local hlGroup = chunk[2]
+            table.insert(newVirtText, { chunkText, hlGroup })
+            chunkWidth = vim.fn.strdisplaywidth(chunkText)
+            -- str width returned from truncate() may less than 2nd argument, need padding
+            if curWidth + chunkWidth < targetWidth then
+              suffix = suffix .. (" "):rep(targetWidth - curWidth - chunkWidth)
+            end
+            break
+          end
+          curWidth = curWidth + chunkWidth
+        end
+        local rAlignAppndx =
+          math.max(math.min(vim.opt.textwidth["_value"], width - 1) - curWidth - sufWidth, 0)
+        suffix = (" "):rep(rAlignAppndx) .. suffix
+        table.insert(newVirtText, { suffix, "MoreMsg" })
+        return newVirtText
+      end
+      opts["fold_virt_text_handler"] = handler
+      require("ufo").setup(opts)
+      vim.keymap.set("n", "K", function()
+        local winid = require("ufo").peekFoldedLinesUnderCursor()
+        if not winid then
+          -- vim.lsp.buf.hover()
+          vim.cmd [[ Lspsaga hover_doc ]]
+        end
+      end)
+    end,
   },
   {
     'kevinhwang91/promise-async',
@@ -90,7 +150,6 @@ lvim.plugins = {
     event = "InsertEnter",
     dependencies = {
       {
-        -- snippet plugin
         "L3MON4D3/LuaSnip",
         dependencies = "rafamadriz/friendly-snippets",
         opts = { history = true, updateevents = "TextChanged,TextChangedI" },
@@ -99,7 +158,6 @@ lvim.plugins = {
           require "configs.luasnip"
         end,
       },
-      -- cmp sources plugins
       {
         "saadparwaiz1/cmp_luasnip",
         "hrsh7th/cmp-nvim-lua",