neovim-config/lua/plugins/folding.lua

return {
  -- add folding range to capabilities
  {
    "neovim/nvim-lspconfig",
    opts = {
      capabilities = {
        textDocument = {
          foldingRange = {
            dynamicRegistration = false,
            lineFoldingOnly = true,
          },
        },
      },
    },
  },
  -- add nvim-ufo
  {
    "kevinhwang91/nvim-ufo",
    dependencies = {
      "kevinhwang91/promise-async",
      -- This looks awful, so leaving it disabled
      -- {
      --   "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,
      -- },
    },
    event = "BufReadPost",
    opts = {
      provider_selector = function()
        return { "treesitter", "indent" }
      end,
    },
    init = function()
      vim.o.foldcolumn = "1" -- '0' is not bad
      vim.o.foldlevel = 99 -- Using ufo provider need a large value, feel free to decrease the value
      vim.o.foldlevelstart = 99
      vim.o.foldenable = true
      -- disabling since LazyVim already sets this nicely and it was overriding my diff fillchar
      -- vim.o.fillchars = [[eob: ,fold: ,foldopen:,foldsep: ,foldclose:]]
      -- Using ufo provider need remap `zR` and `zM`. If Neovim is 0.6.1, remap yourself
      vim.keymap.set("n", "zR", function()
        require("ufo").openAllFolds()
      end)
      vim.keymap.set("n", "zM", function()
        require("ufo").closeAllFolds()
      end)
    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 },
}