# template-filters.py - common template expansion filters

#

# Copyright 2005-2008 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

import cgi, re, os, time, urllib

import encoding, node, util

def addbreaks(text):

    '''replace raw newlines with xhtml line breaks.'''

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

agescales = [("year", 3600 * 24 * 365),

             ("month", 3600 * 24 * 30),

             ("week", 3600 * 24 * 7),

             ("day", 3600 * 24),

             ("hour", 3600),

             ("minute", 60),

             ("second", 1)]

def age(date):

    '''turn a (timestamp, tzoff) tuple into an age string.'''

    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 = date[0]

    if then > now:

        return 'in the future'

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

    if delta > agescales[0][1] * 2:

        return util.shortdate(date)

    for t, s in agescales:

        n = delta // s

        if n >= 2 or s == 1:

            return '%s ago' % fmt(t, n)

def domain(author):

    '''get domain of author, or empty string if none.'''

    f = author.find('@')

    if f == -1:

        return ''

    author = author[f + 1:]

    f = author.find('>')

    if f >= 0:

        author = author[:f]

    return author

para_re = None

space_re = None

def fill(text, width):

    '''fill many paragraphs.'''

    global para_re, space_re

    if para_re is None:

        para_re = re.compile('(\n\n|\n\\s*[-*]\\s*)', re.M)

        space_re = re.compile(r'  +')

    def findparas():

        start = 0

        while True:

            m = para_re.search(text, start)

            if not m:

                uctext = unicode(text[start:], encoding.encoding)

                w = len(uctext)

                while 0 < w and uctext[w - 1].isspace():

                    w -= 1

                yield (uctext[:w].encode(encoding.encoding),

                       uctext[w:].encode(encoding.encoding))

                break

            yield text[start:m.start(0)], m.group(1)

            start = m.end(1)

    return "".join([space_re.sub(' ', util.wrap(para, width=width)) + rest

                    for para, rest in findparas()])

def firstline(text):

    '''return the first line of text'''

    try:

        return text.splitlines(True)[0].rstrip('\r\n')

    except IndexError:

        return ''

def indent(text, prefix):

    '''indent each non-empty line of text after first with prefix.'''

    lines = text.splitlines()

    num_lines = len(lines)

    endswithnewline = text[-1:] == '\n'

    def indenter():

        for i in xrange(num_lines):

            l = lines[i]

            if i and l.strip():

                yield prefix

            yield l

            if i < num_lines - 1 or endswithnewline:

                yield '\n'

    return "".join(indenter())

def json(obj):

    if obj is None or obj is False or obj is True:

        return {None: 'null', False: 'false', True: 'true'}[obj]

    elif isinstance(obj, int) or isinstance(obj, float):

        return str(obj)

    elif isinstance(obj, str):

        u = unicode(obj, encoding.encoding, 'replace')

        return '"%s"' % jsonescape(u)

    elif isinstance(obj, unicode):

        return '"%s"' % jsonescape(obj)

    elif hasattr(obj, 'keys'):

        out = []

        for k, v in obj.iteritems():

            s = '%s: %s' % (json(k), json(v))

            out.append(s)

        return '{' + ', '.join(out) + '}'

    elif hasattr(obj, '__iter__'):

        out = []

        for i in obj:

            out.append(json(i))

        return '[' + ', '.join(out) + ']'

    else:

        raise TypeError('cannot encode type %s' % obj.__class__.__name__)

def _uescape(c):

    if ord(c) < 0x80:

        return c

    else:

        return '\\u%04x' % ord(c)

_escapes = [

    ('\\', '\\\\'), ('"', '\\"'), ('\t', '\\t'), ('\n', '\\n'),

    ('\r', '\\r'), ('\f', '\\f'), ('\b', '\\b'),

]

def jsonescape(s):

    for k, v in _escapes:

        s = s.replace(k, v)

    return ''.join(_uescape(c) for c in s)

def nonempty(str):

    return str or "(none)"

def obfuscate(text):

    text = unicode(text, encoding.encoding, 'replace')

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

def permissions(flags):

    if "l" in flags:

        return "lrwxrwxrwx"

    if "x" in flags:

        return "-rwxr-xr-x"

    return "-rw-r--r--"

def person(author):

    '''get name of author, or else username.'''

    if not '@' in author:

        return author

    f = author.find('<')

    if f == -1:

        return util.shortuser(author)

    return author[:f].rstrip()

def stringify(thing):

    '''turn nested template iterator into string.'''

    if hasattr(thing, '__iter__') and not isinstance(thing, str):

        return "".join([stringify(t) for t in thing if t is not None])

    return str(thing)

def stripdir(text):

    '''Treat the text as path and strip a directory level, if possible.'''

    dir = os.path.dirname(text)

    if dir == "":

        return os.path.basename(text)

    else:

        return dir

def xmlescape(text):

    text = (text

            .replace('&', '&')

            .replace('<', '&lt;')

            .replace('>', '>')

            .replace('"', '"')

            .replace("'", ''')) # ' invalid in HTML

    return re.sub('[\x00-\x08\x0B\x0C\x0E-\x1F]', ' ', text)

filters = {

    "addbreaks": addbreaks,

    "age": age,

    "domain": domain,

    "firstline": firstline,

    "json": json,

    "jsonescape": jsonescape,

    "nonempty": nonempty,

    "obfuscate": obfuscate,

    "permissions": permissions,

    "person": person,

    "stringify": stringify,

    "stripdir": stripdir,

    "xmlescape": xmlescape,

}