# 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, error

import hbisect

def addbreaks(text):

    """:addbreaks: Any text. Add an XHTML "<br />" tag before the end of

    every line except the last.

    """

    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):

    """:age: Date. Returns a human-readable date/time difference between the

    given date/time and the current date/time.

    """

    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]

    future = False

    if then > now:

        future = True

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

        if delta > agescales[0][1] * 30:

            return 'in the distant future'

    else:

        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:

            if future:

                return '%s from now' % fmt(t, n)

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

def basename(path):

    """:basename: Any text. Treats the text as a path, and returns the last

    component of the path after splitting by the path separator

    (ignoring trailing separators). For example, "foo/bar/baz" becomes

    "baz" and "foo/bar//" becomes "bar".

    """

    return os.path.basename(path)

def datefilter(text):

    """:date: Date. Returns a date in a Unix date format, including the

    timezone: "Mon Sep 04 15:13:13 2006 0700".

    """

    return util.datestr(text)

def domain(author):

    """:domain: Any text. Finds the first string that looks like an email

    address, and extracts just the domain component. Example: ``User

    <user@example.com>`` becomes ``example.com``.

    """

    f = author.find('@')

    if f == -1:

        return ''

    author = author[f + 1:]

    f = author.find('>')

    if f >= 0:

        author = author[:f]

    return author

def email(text):

    """:email: Any text. Extracts the first string that looks like an email

    address. Example: ``User <user@example.com>`` becomes

    ``user@example.com``.

    """

    return util.email(text)

def escape(text):

    """:escape: Any text. Replaces the special XML/XHTML characters "&", "<"

    and ">" with XML entities, and filters out NUL characters.

    """

    return cgi.escape(text.replace('\0', ''), True)

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 fill68(text):

    """:fill68: Any text. Wraps the text to fit in 68 columns."""

    return fill(text, 68)

def fill76(text):

    """:fill76: Any text. Wraps the text to fit in 76 columns."""

    return fill(text, 76)

def firstline(text):

    """:firstline: Any text. Returns the first line of text."""

    try:

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

    except IndexError:

        return ''

def hexfilter(text):

    """:hex: Any text. Convert a binary Mercurial node identifier into

    its long hexadecimal representation.

    """

    return node.hex(text)

def hgdate(text):

    """:hgdate: Date. Returns the date as a pair of numbers: "1157407993

    25200" (Unix timestamp, timezone offset).

    """

    return "%d %d" % text

def isodate(text):

    """:isodate: Date. Returns the date in ISO 8601 format: "2009-08-18 13:00

    +0200".

    """

    return util.datestr(text, '%Y-%m-%d %H:%M %1%2')

def isodatesec(text):

    """:isodatesec: Date. Returns the date in ISO 8601 format, including

    seconds: "2009-08-18 13:00:13 +0200". See also the rfc3339date

    filter.

    """

    return util.datestr(text, '%Y-%m-%d %H:%M:%S %1%2')

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 util.safehasattr(obj, 'keys'):

        out = []

        for k, v in obj.iteritems():

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

            out.append(s)

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

    elif util.safehasattr(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 localdate(text):

    """:localdate: Date. Converts a date to local date."""

    return (util.parsedate(text)[0], util.makedate()[1])

def nonempty(str):

    """:nonempty: Any text. Returns '(none)' if the string is empty."""

    return str or "(none)"

def obfuscate(text):

    """:obfuscate: Any text. Returns the input text rendered as a sequence of

    XML entities.

    """

    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):

    """:person: Any text. Returns the name before an email address,

    interpreting it as per RFC 5322.

    >>> person('foo@bar')

    'foo'

    >>> person('Foo Bar <foo@bar>')

    'Foo Bar'

    >>> person('"Foo Bar" <foo@bar>')

    'Foo Bar'

    >>> person('"Foo \"buz\" Bar" <foo@bar>')

    'Foo "buz" Bar'

    >>> # The following are invalid, but do exist in real-life

    ...

    >>> person('Foo "buz" Bar <foo@bar>')

    'Foo "buz" Bar'

    >>> person('"Foo Bar <foo@bar>')

    'Foo Bar'

    """

    if '@' not in author:

        return author

    f = author.find('<')

    if f != -1:

        return author[:f].strip(' "').replace('\\"', '"')

    f = author.find('@')

    return author[:f].replace('.', ' ')

def rfc3339date(text):

    """:rfc3339date: Date. Returns a date using the Internet date format

    specified in RFC 3339: "2009-08-18T13:00:13+02:00".

    """

    return util.datestr(text, "%Y-%m-%dT%H:%M:%S%1:%2")

def rfc822date(text):

    """:rfc822date: Date. Returns a date using the same format used in email

    headers: "Tue, 18 Aug 2009 13:00:13 +0200".

    """

    return util.datestr(text, "%a, %d %b %Y %H:%M:%S %1%2")

def short(text):

    """:short: Changeset hash. Returns the short form of a changeset hash,

    i.e. a 12 hexadecimal digit string.

    """

    return text[:12]

def shortbisect(text):

    """:shortbisect: Any text. Treats `text` as a bisection status, and

    returns a single-character representing the status (G: good, B: bad,

    S: skipped, U: untested, I: ignored). Returns single space if `text`

    is not a valid bisection status.

    """

    return hbisect.shortlabel(text) or ' '

def shortdate(text):

    """:shortdate: Date. Returns a date like "2006-09-18"."""

    return util.shortdate(text)

def stringescape(text):

    return text.encode('string_escape')

def stringify(thing):

    """:stringify: Any type. Turns the value into text by converting values into

    text and concatenating them.

    """

    if util.safehasattr(thing, '__iter__') and not isinstance(thing, str):

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

    return str(thing)

def strip(text):

    """:strip: Any text. Strips all leading and trailing whitespace."""

    return text.strip()

def stripdir(text):

    """:stripdir: Treat the text as path and strip a directory level, if

    possible. For example, "foo" and "foo/bar" becomes "foo".

    """

    dir = os.path.dirname(text)

    if dir == "":

        return os.path.basename(text)

    else:

        return dir

def tabindent(text):

    """:tabindent: Any text. Returns the text, with every line except the

    first starting with a tab character.

    """

    return indent(text, '\t')

def urlescape(text):

    """:urlescape: Any text. Escapes all "special" characters. For example,

    "foo bar" becomes "foo%20bar".

    """

    return urllib.quote(text)

def userfilter(text):

    """:user: Any text. Returns a short representation of a user name or email

    address."""

    return util.shortuser(text)

def emailuser(text):

    """:emailuser: Any text. Returns the user portion of an email address."""

    return util.emailuser(text)

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,

    "basename": basename,

    "date": datefilter,

    "domain": domain,

    "email": email,

    "escape": escape,

    "fill68": fill68,

    "fill76": fill76,

    "firstline": firstline,

    "hex": hexfilter,

    "hgdate": hgdate,

    "isodate": isodate,

    "isodatesec": isodatesec,

    "json": json,

    "jsonescape": jsonescape,

    "localdate": localdate,

    "nonempty": nonempty,

    "obfuscate": obfuscate,

    "permissions": permissions,

    "person": person,

    "rfc3339date": rfc3339date,

    "rfc822date": rfc822date,

    "short": short,

    "shortbisect": shortbisect,

    "shortdate": shortdate,