"""Simple script to replace @DATE@ and friends with real information. Usage:  rewrite.py boilerplate.tex [VAR=value] ... <template >output""" import sysimport time  def get_info(fp):    s = fp.read()     d = {}    start = s.find(r"\date{")    if start >= 0:        end = s.find("}", start)        date = s[start+6:end]        if date == r"\today":            date = time.strftime("%B %d, %Y", time.localtime(time.time()))        d["DATE"] = date    return d  def main():    s = sys.stdin.read()    if "@" in s:        # yes, we actully need to load the replacement values        d = get_info(open(sys.argv[1]))        for arg in sys.argv[2:]:            name, value = arg.split("=", 1)            d[name] = value        start = 0        while 1:            start = s.find("@", start)            if start < 0:                break            end = s.find("@", start+1)            name = s[start+1:end]            if name:                value = d.get(name)                if value is None:                    start = end + 1                else:                    s = s[:start] + value + s[end+1:]                    start = start + len(value)            else:                # "@@" --> "@"                s = s[:start] + s[end:]                start = end    sys.stdout.write(s)  if __name__ == "__main__":    main()