def website(self):
        """Look for a URL in the audio metadata, or a Google search
        if no URL can be found."""

        if "website" in self:
            return self.list("website")[0]
        for cont in self.list("contact") + self.list("comment"):
            c = cont.lower()
            if (c.startswith("http://") or c.startswith("https://") or
                    c.startswith("www.")):
                return cont
            elif c.startswith("//www."):
                return "http:" + cont
        else:
            text = "http://www.google.com/search?q="
            esc = lambda c: ord(c) > 127 and '%%%x' % ord(c) or c
            if "labelid" in self:
                text += ''.join(map(esc, self["labelid"]))
            else:
                artist = util.escape("+".join(self("artist").split()))
                album = util.escape("+".join(self("album").split()))
                artist = encode(artist)
                album = encode(album)
                artist = "%22" + ''.join(map(esc, artist)) + "%22"
                album = "%22" + ''.join(map(esc, album)) + "%22"
                text += artist + "+" + album
            text += "&ie=UTF8"
            return text

    def to_dump(self):
        """A string of 'key=value' lines, similar to vorbiscomment output."""

        def encode_key(k):
            return encode(k) if isinstance(k, unicode) else k

        s = []
        for k in self.keys():
            enc_key = encode_key(k)

            if isinstance(self[k], int) or isinstance(self[k], long):
                s.append("%s=%d" % (enc_key, self[k]))
            elif isinstance(self[k], float):
                s.append("%s=%f" % (enc_key, self[k]))
            else:
                for v2 in self.list(k):
                    if isinstance(v2, str):
                        s.append("%s=%s" % (enc_key, v2))
                    else:
                        s.append("%s=%s" % (enc_key, encode(v2)))
        for k in (INTERN_NUM_DEFAULT - set(self.keys())):
            enc_key = encode_key(k)
            s.append("%s=%d" % (enc_key, self.get(k, 0)))
        if "~#rating" not in self:
            s.append("~#rating=%f" % self("~#rating"))
        s.append("~format=%s" % self.format)
        s.append("")
        return "\n".join(s)

    def to_dump(self):
        # dump without title
        title = None
        if "title" in self:
            title = self["title"]
            del self["title"]
        dump = super(IRFile, self).to_dump()
        if title is not None:
            self["title"] = title

        # add all generated tags
        lines = dump.splitlines()
        for tag in ["title", "artist", "~format"]:
            value = self.get(tag)
            if value is not None:
                lines.append(encode(tag) + b"=" + encode(value))
        return b"\n".join(lines)

    def to_dump(self):
        """A string of 'key=value' lines, similar to vorbiscomment output.

        Returns:
            bytes
        """

        def encode_key(k):
            return encode(k) if isinstance(k, text_type) else k

        s = []
        for k in self.keys():
            enc_key = encode_key(k)
            assert isinstance(enc_key, bytes)

            if isinstance(self[k], integer_types):
                l = enc_key + encode("=%d" % self[k])
                s.append(l)
            elif isinstance(self[k], float):
                l = enc_key + encode("=%f" % self[k])
                s.append(l)
            else:
                for v2 in self.list(k):
                    if not isinstance(v2, bytes):
                        v2 = encode(v2)
                    s.append(enc_key + b"=" + v2)
        for k in (NUMERIC_ZERO_DEFAULT - set(self.keys())):
            enc_key = encode_key(k)
            l = enc_key + encode("=%d" % self.get(k, 0))
            s.append(l)
        if "~#rating" not in self:
            s.append(encode("~#rating=%f" % self("~#rating")))
        s.append(encode("~format=%s" % self.format))
        s.append(b"")
        return b"\n".join(s)

    def copy(self, parent_widget, song):
        if self.__load_db() is None:
            return False
        track = gpod.itdb_track_new()

        # All values should be utf-8 encoded strings
        # Filepaths should be encoded with the fs encoding

        # Either combine tags with comma, or only take the first value
        if self['all_tags']:
            tag = song.comma
        else:
            tag = lambda key: (song.list(key) or ('',))[0]

        title = tag('title')
        if self['title_version'] and song('version'):
            title = " - ".join([title, song('version')])
        track.title = encode(title)

        album = tag('album')
        if self['album_part'] and song('discsubtitle'):
            album = " - ".join([album, song('discsubtitle')])
        track.album = encode(album)

        # String keys
        for key in ['artist', 'genre', 'grouping', 'composer', 'albumartist']:
            if hasattr(track, key):  # albumartist since libgpod-0.4.2
                setattr(track, key, encode(tag(key)))
        # Sort keys (since libgpod-0.5.0)
        for key in ['artist', 'album', 'albumartist']:
            if hasattr(track, 'sort_' + key):
                setattr(track, 'sort_' + key, encode(tag(key + 'sort')))
        # Numeric keys
        for key in ['bitrate', 'playcount', 'year']:
            try:
                setattr(track, key, int(song('~#' + key)))
            except ValueError:
                continue
        # Numeric keys where the names differ
        for key, value in {
            'cd_nr': song('~#disc'),
            'cds': song('~#discs'),
            'rating': min(100, song('~#rating') * 100),
            'time_added': self.__mactime(time.time()),
            'time_modified': self.__mactime(mtime(song('~filename'))),
            'track_nr': song('~#track'),
            'tracklen': song('~#length') * 1000,
            'tracks': song('~#tracks'),
            'size': filesize(song('~filename')),
            'soundcheck': self.__soundcheck(song),
        }.items():
            try:
                setattr(track, key, int(value))
            except ValueError:
                continue

        track.filetype = encode(song('~format'))
        track.comment = encode(fsdecode(song('~filename')))

        # Associate a cover with the track
        if self['covers']:
            cover = app.cover_manager.get_cover(song)
            if cover:
                # libgpod will copy the file later when the iTunesDB
                # is saved, so we have to keep a reference around in
                # case the cover is a temporary file.
                self.__covers.append(cover)
                gpod.itdb_track_set_thumbnails(
                    track, fsnative2glib(cover.name))

        # Add the track to the master playlist
        gpod.itdb_track_add(self.__itdb, track, -1)
        master = gpod.itdb_playlist_mpl(self.__itdb)
        gpod.itdb_playlist_add_track(master, track, -1)

        # Copy the actual file
        if gpod.itdb_cp_track_to_ipod(track, song['~filename'], None) == 1:
            return IPodSong(track)
        else:
            return False

 def encode_key(k):
     return encode(k) if isinstance(k, text_type) else k

 def test_unicode(self):
     self.failUnlessEqual(encode(u"abcde"), "abcde")

 def test_empty(self):
     self.failUnlessEqual(encode(""), "")

 def encode_key(k):
     return encode(k) if isinstance(k, unicode) else k

 def encode_key(k):
     return encode(k) if isinstance(k, str) else k

    def copy(self, parent_widget, song):
        if self.__load_db() is None:
            return False
        track = gpod.itdb_track_new()

        # All values should be utf-8 encoded strings
        # Filepaths should be encoded with the fs encoding

        # Either combine tags with comma, or only take the first value
        if self["all_tags"]:
            tag = song.comma
        else:
            tag = lambda key: (song.list(key) or ("",))[0]

        title = tag("title")
        if self["title_version"] and song("version"):
            title = " - ".join([title, song("version")])
        track.title = encode(title)

        album = tag("album")
        if self["album_part"] and song("discsubtitle"):
            album = " - ".join([album, song("discsubtitle")])
        track.album = encode(album)

        # String keys
        for key in ["artist", "genre", "grouping", "composer", "albumartist"]:
            if hasattr(track, key):  # albumartist since libgpod-0.4.2
                setattr(track, key, encode(tag(key)))
        # Sort keys (since libgpod-0.5.0)
        for key in ["artist", "album", "albumartist"]:
            if hasattr(track, "sort_" + key):
                setattr(track, "sort_" + key, encode(tag(key + "sort")))
        # Numeric keys
        for key in ["bitrate", "playcount", "year"]:
            try:
                setattr(track, key, int(song("~#" + key)))
            except ValueError:
                continue
        # Numeric keys where the names differ
        for key, value in {
            "cd_nr": song("~#disc"),
            "cds": song("~#discs"),
            "rating": min(100, song("~#rating") * 100),
            "time_added": self.__mactime(time.time()),
            "time_modified": self.__mactime(mtime(song("~filename"))),
            "track_nr": song("~#track"),
            "tracklen": song("~#length") * 1000,
            "tracks": song("~#tracks"),
            "size": filesize(song("~filename")),
            "soundcheck": self.__soundcheck(song),
        }.items():
            try:
                setattr(track, key, int(value))
            except ValueError:
                continue

        track.filetype = encode(song("~format"))
        track.comment = encode(fsdecode(song("~filename")))

        # Associate a cover with the track
        if self["covers"]:
            cover = app.cover_manager.get_cover(song)
            if cover:
                # libgpod will copy the file later when the iTunesDB
                # is saved, so we have to keep a reference around in
                # case the cover is a temporary file.
                self.__covers.append(cover)
                gpod.itdb_track_set_thumbnails(track, fsnative2glib(cover.name))

        # Add the track to the master playlist
        gpod.itdb_track_add(self.__itdb, track, -1)
        master = gpod.itdb_playlist_mpl(self.__itdb)
        gpod.itdb_playlist_add_track(master, track, -1)

        # Copy the actual file
        if gpod.itdb_cp_track_to_ipod(track, song["~filename"], None) == 1:
            return IPodSong(track)
        else:
            return False