Re-enable proper caching of rendered segments in server. The server keeps records on files that are processed while the server is running. Disk caching is simply disabled for files that are known to use other pages -- because unlike the baker, there's no cheap way to know which files are up to date or not, and rendering is faster enough anyway.

PRIORITY_FIRST = -1
PRIORITY_NORMAL = 0
PRIORITY_LAST = 1


class Formatter(object):
    FORMAT_NAMES = None
    OUTPUT_FORMAT = None

    def __init__(self):
        self.priority = PRIORITY_NORMAL

    def initialize(self, app):
        self.app = app

    def render(self, format_name, txt):
        raise NotImplementedError()