fix: add nil check to get_cwd

[kezhenxu94]

In a recent update, I found the restore of rmagatti/auto-session doesn't work, and from my debugging, it looks like the function get_cwd needs a nil check.

When get_cwd is used in the autocmd (BufEnter), the core is not initialized and thus TreeExplorer is nil and thus TreeExplorer.absolute_path throws exception, this PR adds a nil check to the TreeExplorer

nvim-tree.lua/lua/nvim-tree.lua

Line 287 in de75276

if vim.fn.getcwd() ~= core.get_cwd() or (opts.reload_on_bufenter and not opts.filesystem_watchers.enable) then

Reproducible Configs

I'm using LazyVIM

~/.config/nvim/lua/custom/plugins/nvim-tree.lua

return {
  "nvim-tree/nvim-tree.lua",
  lazy = false,
  dependencies = {
    "nvim-tree/nvim-web-devicons",
  },
  config = function()
    require("nvim-tree").setup {}

    -- restore nvim-tree with auto-session
    local api = require "nvim-tree.api"
    local view = require "nvim-tree.view"
    vim.api.nvim_create_autocmd("BufEnter", {
      pattern = "NvimTree*",
      callback = function()
        if not view.is_visible() then
          api.tree.open()
        end
      end,
    })
  end,
}

~/.config/nvim/lua/custom/plugins/auto-session.lua

return {
  'rmagatti/auto-session',
  config = function()
    require("auto-session").setup {
      log_level = "error",
      auto_session_suppress_dirs = { "~/", "~/Projects", "~/Downloads", "/", "/tmp" },
    }
  end
}

Then open neovim, open a file and open the NvimTree, then :SessionSave, and exit neovim. Next time you open neovim a exception will be thrown.

[alex-courtis]

Great catch! Many thanks for your contribution.

It appears that most callers are nil safe. If we find any that aren't we can resolve them.