configs/home/.config/nvim/nvim-tree.vim

" Open NvimTree with f5"
nnoremap <F5> :NvimTreeToggle<CR>

lua << EOF

local HEIGHT_RATIO = 0.8  -- You can change this
local WIDTH_RATIO = 0.8   -- You can change this too

local function my_on_attach(bufnr)
  local api = require "nvim-tree.api"

  local function opts(desc)
    return { desc = "nvim-tree: " .. desc, buffer = bufnr, noremap = true, silent = true, nowait = true }
  end

  -- default mappings
  api.config.mappings.default_on_attach(bufnr)

  -- custom mappings
  -- cd 
  vim.keymap.set('n', '<C-c>', api.tree.change_root_to_node,        opts('Up'))
  vim.keymap.set('n', '?',     api.tree.toggle_help,                  opts('Help'))
end

-- empty setup using defaults
require("nvim-tree").setup()
require('nvim-tree').setup({
  view = {
    float = {
      enable = true,
      open_win_config = function()
        local screen_w = vim.opt.columns:get()
        local screen_h = vim.opt.lines:get() - vim.opt.cmdheight:get()
        local window_w = screen_w * WIDTH_RATIO
        local window_h = screen_h * HEIGHT_RATIO
        local window_w_int = math.floor(window_w)
        local window_h_int = math.floor(window_h)
        local center_x = (screen_w - window_w) / 2
        local center_y = ((vim.opt.lines:get() - window_h) / 2)
                         - vim.opt.cmdheight:get()
        return {
          border = 'rounded',
          relative = 'editor',
          row = center_y,
          col = center_x,
          width = window_w_int,
          height = window_h_int,
        }
        end,
    },
    width = function()
      return math.floor(vim.opt.columns:get() * WIDTH_RATIO)
    end,
  },
  on_attach = my_on_attach,
})

EOF