local install_path = vim.fn.stdpath('data')..'/site/pack/packer/start/packer.nvim'
if vim.fn.empty(vim.fn.glob(install_path)) > 0 then
    packer_bootstrap = vim.fn.system({
        'git',
        'clone',
        '--depth',
        '1',
        'https://github.com/wbthomason/packer.nvim',
        install_path})
    vim.cmd [[packadd packer.nvim]]
end

packer = require('packer')
packer.init()

packer.use 'https://github.com/wbthomason/packer.nvim'

-- source file, install and compile plugins when config file is written
vim.api.nvim_create_augroup('packer_user_config', { clear = true })
vim.api.nvim_create_autocmd(
    { 'BufWritePost' },
    {
        group = 'packer_user_config',
        pattern = { '*/nvim/lua/*.lua', '*/nvim/init.lua' },
        callback = function()
            -- exclude plugins.lua, because that would re-init packer
            if not vim.api.nvim_buf_get_name(0):match('plugins.lua$') then
                vim.cmd([[
                    source <afile>
                    PackerInstall
                ]])
            end
        end
    }
)
vim.api.nvim_create_autocmd(
    { 'User' },
    {
        group = 'packer_user_config',
        pattern = 'PackerComplete',
        command = [[PackerCompile]]
    }
)
vim.api.nvim_create_autocmd(
    { 'User' },
    {
        group = 'packer_user_config',
        pattern = 'PackerCompileDone',
        command = [[echo 'plugins compiled']]
    }
)