run_app = function()
	-- ## run: initialize
	clear_handlers()
	edit.clear(Output_editor_state)
	print = print_to_output
	-- ## run
	local error = eval_all()
	-- ## run: save some stuff, clean up the rest
	if error == nil then
		Show_code = nil
	else
		print = Real_print
		clear_handlers()
		table.insert(Output_editor_state.lines, {data=tostring(error)})
	end
	if #Output_editor_state.lines == 0 then
		table.insert(Output_editor_state.lines, {data=''})
	end
	Text.redraw_all(Output_editor_state)
end