implement Newer; ## test if a file is up to date# include "sys.m"; include "draw.m"; Newer: module{	init:	fn(nil: ref Draw->Context, nil: list of string);}; init(nil: ref Draw->Context, args: list of string){	sys := load Sys Sys->PATH;	if(len args != 3){		sys->fprint(sys->fildes(2), "usage: newer newfile oldfile\n");		raise "fail:usage";	}	args = tl args;	(ok1, d1) := sys->stat(hd args);	if(ok1 < 0)		raise sys->sprint("fail:new:%r");	if(d1.mode & Sys->DMDIR)		raise "fail:new:directory";	(ok2, d2) := sys->stat(hd tl args);	if(ok2 < 0)		raise sys->sprint("fail:old:%r");	if(d2.mode & Sys->DMDIR)		raise "fail:old:directory";	if(d2.mtime > d1.mtime)		raise "fail:older";}