neovim/lua/plugins/packer_setup.lua

-- Auto install packer.nvim if not exists
local install_path = vim.fn.stdpath('data') .. '/site/pack/packer/opt/packer.nvim'
if vim.fn.empty(vim.fn.glob(install_path)) > 0 then
    vim.api.nvim_command('!git clone https://github.com/wbthomason/packer.nvim ' .. install_path)
end

vim.cmd [[packadd packer.nvim]]
-- Auto compile when there are changes in plugins.lua
vim.cmd 'autocmd BufWritePost plugins.lua PackerCompile'