nvim/lua/config/plugins/fold.lua

return {
  "bbjornstad/pretty-fold.nvim",
  enabled = true,
  config = function()
    local global_setup = {
      sections = {
        left = { "content" },
        right = {
          " ",
          function()
            return ("[%dL]"):format(vim.v.foldend - vim.v.foldstart)
          end,
          "[",
          "percentage",
          "]",
        },
      },
      matchup_patterns = {
        { "{", "}" },
        { "%(", ")" }, -- % to escape lua pattern char
        { "%[", "]" }, -- % to escape lua pattern char
      },
      -- add_close_pattern = true,
      process_comment_signs = ({ "delete", "spaces", false })[2],
    }

    local function ft_setup(lang, options) -- {{{
      local opts = vim.tbl_deep_extend("force", global_setup, options)
      -- combine global and ft specific matchup_patterns
      if opts and opts.matchup_patterns and global_setup.matchup_patterns then
        opts.matchup_patterns = vim.list_extend(opts.matchup_patterns, global_setup.matchup_patterns)
      end
      require("pretty-fold").ft_setup(lang, opts)
    end -- }}}

    require("pretty-fold").setup(global_setup)

    ft_setup("lua", { -- {{{
      matchup_patterns = {
        { "^%s*do$", "end" }, -- do ... end blocks
        { "^%s*if", "end" }, -- if ... end
        { "^%s*for", "end" }, -- for
        { "function[^%(]*%(", "end" }, -- 'function( or 'function (''
      },
    }) -- }}}

    ft_setup("vim", { -- {{{
      matchup_patterns = {
        { "^%s*function!?[^%(]*%(", "endfunction" },
      },
    }) -- }}}
  end,
}