nvim-tree.lua修改成ranger风格

配置文件如下：

~/.config/nvim/after/plugin/nvim-tree.lua

内容如下：

-- following options are the default
local tree_cb = require'nvim-tree.config'.nvim_tree_callback
require'nvim-tree'.setup {
	-- disables netrw completely
	disable_netrw       = false,
	-- hijack netrw window on startup
	hijack_netrw        = true,
	-- open the tree when running this setup function
	open_on_setup       = true,
	-- will not open on setup if the filetype is in this list
	ignore_ft_on_setup  = {},
	-- closes neovim automatically when the tree is the last **WINDOW** in the view
	auto_close          = true,
	-- opens the tree when changing/opening a new tab if the tree wasn't previously opened
	open_on_tab         = true,
	-- hijacks new directory buffers when they are opened.
	update_to_buf_dir   = {
		-- enable the feature
		enable = true,
		-- allow to open the tree if it was previously closed
		auto_open = true,
	},
	-- hijack the cursor in the tree to put it at the start of the filename
	hijack_cursor       = false,
	-- updates the root directory of the tree on `DirChanged` (when your run `:cd` usually)
	update_cwd          = false,
	-- show lsp diagnostics in the signcolumn
	lsp_diagnostics     = false,
	-- update the focused file on `BufEnter`, un-collapses the folders recursively until it finds the file
	update_focused_file = {
		-- enables the feature
		enable      = false,
		-- update the root directory of the tree to the one of the folder containing the file if the file is not under the current root directory
		-- only relevant when `update_focused_file.enable` is true
		update_cwd  = false,
		-- list of buffer names / filetypes that will not update the cwd if the file isn't found under the current root directory
		-- only relevant when `update_focused_file.update_cwd` is true and `update_focused_file.enable` is true
		ignore_list = {}
	},
	-- configuration options for the system open command (`s` in the tree by default)
	system_open = {
		-- the command to run this, leaving nil should work in most cases
		cmd  = nil,
		-- the command arguments as a list
		args = {}
	},

	view = {
		-- width of the window, can be either a number (columns) or a string in `%`, for left or right side placement
		width = 30,
		-- height of the window, can be either a number (columns) or a string in `%`, for top or bottom side placement
		height = 30,
		-- side of the tree, can be one of 'left' | 'right' | 'top' | 'bottom'
		side = 'left',
		-- if true the tree will resize itself after opening a file
		auto_resize = true,
		mappings = {
			-- custom only false will merge the list with the default mappings
			-- if true, it will only use your list to set the mappings
			custom_only = true,
			-- list of mappings to set on the tree manually
			list = {
				{ key = {"", "o", "","l"}, cb = tree_cb("edit") },
				{ key = {"", ""},    cb = tree_cb("cd") },
				{ key = "",                        cb = tree_cb("vsplit") },
				{ key = "",                        cb = tree_cb("split") },
				{ key = "",                        cb = tree_cb("tabnew") },
				{ key = "