nvim-ufo.lua

return {
  'kevinhwang91/nvim-ufo',
  dependencies = {
    'kevinhwang91/promise-async'
  },
  event = "BufRead",
  keys = {
    { "zR", function() require('ufo').openAllFolds() end, desc = "Open all folds" },
    { "zM", function() require('ufo').closeAllFolds() end, desc = "Close all folds" },
    { "zZ", function() require('ufo').peekFoldedLinesUnderCursor() end, desc = "Peed folded lines under cursor" },
  },
  opts = {
    open_fold_hl_timeout = 0,
    fold_virt_text_handler = function(text, lnum, endLnum, width)
      local suffix = "  "
      local lines  = ('[%d lines] '):format(endLnum - lnum)

      local cur_width = 0
      for _, section in ipairs(text) do
        cur_width = cur_width + vim.fn.strdisplaywidth(section[1])
      end

      suffix = suffix .. (' '):rep(width - cur_width - vim.fn.strdisplaywidth(lines) - 3)

      table.insert(text, { suffix, 'Comment' })
      table.insert(text, { lines, 'Todo' })
      return text
    end,
    preview = {
      win_config = {
        border = {"┏", "━", "┓", "┃", "┛", "━", "┗", "┃"},
        winblend     = 0,
        winhighlight = "Normal:LazyNormal",
      }
    }
  },
}