init.bash

function nvim_packer_restart() {
  nvim "$@"

  if [[ -e "$TMPDIR""packer_compile_at_start" ]]; then
    nvim_packer_restart "$0"
  fi
}

alias nvim='nvim_packer_restart'

packer_init.lua

local packer = require("packer")

local M = {}

local SENTINEL_PATH = os.getenv("TMPDIR") .. "packer_compile_at_start"

local did_restart = function()
	local f = io.open(SENTINEL_PATH, "r")
	if f ~= nil then
		io.close(f)
		return true
	else
		return false
	end
end

function _G.restart()
	if did_restart() then
		return false
	end

	local f = io.open(SENTINEL_PATH, "w")
	f:write("")
	f:close()

	vim.cmd("qa")
end

local do_startup = function(plugs)
	local ok, err = pcall(packer.startup, plugs)
	if not ok then
		vim.notify(string.format("Bad packer startup: %s", vim.inspect(err)))
	end
end

function M.packer_startup(plugs)
	do_startup(plugs)

	if did_restart() then
		_G.do_startup = function()
			do_startup(plugs)
			os.remove(SENTINEL_PATH)
			_G.do_startup = nil
		end
		vim.cmd([[ autocmd User PackerComplete ++once PackerCompile ]])
		vim.cmd([[ autocmd User PackerCompileDone ++once lua do_startup() ]])
		packer.install()
	end
end

return M