from demandload import demandload

demandload(globals(), "cgi os re time urllib util")

class templater(object):

    def __init__(self, mapfile, filters={}, defaults={}):

        self.cache = {}

        self.map = {}

        self.base = os.path.dirname(mapfile)

        self.filters = filters

        self.defaults = defaults

        for l in file(mapfile):

            m = re.match(r'(\S+)\s*=\s*"(.*)"$', l)

            if m:

                self.cache[m.group(1)] = m.group(2)

            else:

                m = re.match(r'(\S+)\s*=\s*(\S+)', l)

                if m:

                    self.map[m.group(1)] = os.path.join(self.base, m.group(2))

                else:

                    raise LookupError(_("unknown map entry '%s'") % l)

    def __call__(self, t, **map):

        m = self.defaults.copy()

        m.update(map)

        try:

            tmpl = self.cache[t]

        except KeyError:

            tmpl = self.cache[t] = file(self.map[t]).read()

        return self.template(tmpl, self.filters, **m)

    def template(self, tmpl, filters={}, **map):

        while tmpl:

            m = re.search(r"#([a-zA-Z0-9]+)((%[a-zA-Z0-9]+)*)((\|[a-zA-Z0-9]+)*)#", tmpl)

            if m:

                yield tmpl[:m.start(0)]

                v = map.get(m.group(1), "")

                v = callable(v) and v(**map) or v

                format = m.group(2)

                fl = m.group(4)

                if format:

                    q = v.__iter__

                    for i in q():

                        lm = map.copy()

                        lm.update(i)

                        yield self(format[1:], **lm)

                    v = ""

                elif fl:

                    for f in fl.split("|")[1:]:

                        v = filters[f](v)

                yield v

                tmpl = tmpl[m.end(0):]

            else:

                yield tmpl

                return

def age(x):

    def plural(t, c):

        if c == 1:

            return t

        return t + "s"

    def fmt(t, c):

        return "%d %s" % (c, plural(t, c))

    now = time.time()

    then = x[0]

    delta = max(1, int(now - then))

    scales = [["second", 1],

              ["minute", 60],

              ["hour", 3600],

              ["day", 3600 * 24],

              ["week", 3600 * 24 * 7],

              ["month", 3600 * 24 * 30],

              ["year", 3600 * 24 * 365]]

    scales.reverse()

    for t, s in scales:

        n = delta / s

        if n >= 2 or s == 1:

            return fmt(t, n)

def nl2br(text):

    return text.replace('\n', '<br/>\n')

def obfuscate(text):

    return ''.join(['&#%d;' % ord(c) for c in text])

common_filters = {

    "escape": lambda x: cgi.escape(x, True),

    "urlescape": urllib.quote,

    "strip": lambda x: x.strip(),

    "age": age,

    "date": lambda x: util.datestr(x),

    "addbreaks": nl2br,

    "obfuscate": obfuscate,

    "short": (lambda x: x[:12]),

    "firstline": (lambda x: x.splitlines(1)[0]),

    "permissions": (lambda x: x and "-rwxr-xr-x" or "-rw-r--r--"),

    "rfc822date": lambda x: util.datestr(x, "%a, %d %b %Y %H:%M:%S"),

    }