# Source code for poezio.theming

    #!/usr/bin/env python3
    # Copyright 2010-2011 Florent Le Coz <louiz@louiz.org>
    #
    # This file is part of Poezio.
    #
    # Poezio is free software: you can redistribute it and/or modify
    # it under the terms of the GPL-3.0+ license. See the COPYING file.
    """
    Define the variables (colors and some other stuff) that are
    used when drawing the interface.

    Colors are numbers from -1 to 7 (if only 8 colors are supported) or -1 to 255
    if 256 colors are available.
    If only 8 colors are available, all colors > 8 are converted using the
    table_256_to_16 dict.

    XHTML-IM colors are converted to -1 -> 255 colors if available, or directly to
    -1 -> 8 if we are in 8-color-mode.

    A pair_color is a background-foreground pair. All possible pairs are not created
    at startup, because that would create 256*256 pairs, and almost all of them
    would never be used.

    A theme should define color tuples, like ``(200, -1)``, and when they are to
    be used by poezio's interface, they will be created once, and kept in a list for
    later usage.
    A color tuple is of the form ``(foreground, background, optional)``
    A color of -1 means the default color. So if you do not want to have
    a background color, use ``(x, -1)``.
    The optional third value of the tuple defines additional information. It
    is a string and can contain one or more of these characters:

    - ``b``: bold
    - ``u``: underlined
    - ``x``: blink

    For example, ``(200, 208, 'bu')`` is bold, underlined and pink foreground on
    orange background.

    A theme file is a python file containing one object named 'theme', which is an
    instance of a class (derived from the Theme class) defined in that same file.
    For example, in pinkytheme.py:

    .. code-block:: python

        import theming
        class PinkyTheme(theming.Theme):
            COLOR_NORMAL_TEXT = (200, -1)

        theme = PinkyTheme()

    if the command '/theme pinkytheme' is issued, we import the pinkytheme.py file
    and set the global variable 'theme' to pinkytheme.theme.

    And in poezio's code we just use ``theme.COLOR_NORMAL_TEXT`` etc

    Since a theme inherites from the Theme class (defined here), if a color is not defined in a
    theme file, the color is the default one.

    Some values in that class are a list of color tuple.
    For example ``[(1, -1), (2, -1), (3, -1)]``
    Such a list SHOULD contain at least one color tuple.
    It is used for example to define color gradient, etc.
    """

    import logging
    log = logging.getLogger(__name__)

    try:
        from poezio.config import config
    except ImportError:
        if __name__ != "__main__":
            raise

    import curses
    import functools
    from typing import Dict, List, Union, Tuple, Optional, cast
    from pathlib import Path
    from os import path
    from poezio import colors, xdg
    from datetime import datetime

    from importlib import machinery
    finder = machinery.PathFinder()

    class Theme:
        """
        The theme class, from which all themes should inherit.
        All of the following values can be replaced in subclasses, in
        order to create a new theme.

        Do not edit this file if you want to change the theme to suit your
        needs. Create a new theme and share it if you think it can be useful
        for others.
        """

        @classmethod
        def color_role(cls, role: str):
            role_mapping = {
                'moderator': cls.COLOR_USER_MODERATOR,
                'participant': cls.COLOR_USER_PARTICIPANT,
                'visitor': cls.COLOR_USER_VISITOR,
                'none': cls.COLOR_USER_NONE,
                '': cls.COLOR_USER_NONE
            }
            return role_mapping.get(role, cls.COLOR_USER_NONE)

        @classmethod
        def char_affiliation(cls, affiliation: str):
            affiliation_mapping = {
                'owner': cls.CHAR_AFFILIATION_OWNER,
                'admin': cls.CHAR_AFFILIATION_ADMIN,
                'member': cls.CHAR_AFFILIATION_MEMBER,
                'none': cls.CHAR_AFFILIATION_NONE
            }
            return affiliation_mapping.get(affiliation, cls.CHAR_AFFILIATION_NONE)

        @classmethod
        def color_show(cls, show: str):
            show_mapping = {
                'xa': cls.COLOR_STATUS_XA,
                'none': cls.COLOR_STATUS_NONE,
                'dnd': cls.COLOR_STATUS_DND,
                'away': cls.COLOR_STATUS_AWAY,
                'chat': cls.COLOR_STATUS_CHAT,
                '': cls.COLOR_STATUS_ONLINE,
                'available': cls.COLOR_STATUS_ONLINE,
                'unavailable': cls.COLOR_STATUS_UNAVAILABLE,
            }
            return show_mapping.get(show, cls.COLOR_STATUS_NONE)

        @classmethod
        def char_subscription(cls, sub: str, keep: str = 'incomplete'):
            sub_mapping = {
                'from': cls.CHAR_ROSTER_FROM,
                'both': cls.CHAR_ROSTER_BOTH,
                'none': cls.CHAR_ROSTER_NONE,
                'to': cls.CHAR_ROSTER_TO,
            }
            if keep == 'incomplete' and sub == 'both':
                return ''
            if keep in ('both', 'none', 'to', 'from'):
                return sub_mapping[sub] if sub == keep else ''
            return sub_mapping.get(sub, '')

        # Short date format (only show time)
        SHORT_TIME_FORMAT = '%H:%M:%S'
        SHORT_TIME_FORMAT_LENGTH = len(datetime.now().strftime(SHORT_TIME_FORMAT))

        # Long date format (show date and time)
        LONG_TIME_FORMAT = '%Y-%m-%d %H:%M:%S'
        LONG_TIME_FORMAT_LENGTH = len(datetime.now().strftime(LONG_TIME_FORMAT))

        # Message text color
        COLOR_NORMAL_TEXT = (-1, -1)
        COLOR_INFORMATION_TEXT = (5, -1)  # TODO
        COLOR_WARNING_TEXT = (1, -1)

        # Color of the commands in the help message
        COLOR_HELP_COMMANDS = (208, -1)

        # "reverse" is a special value, available only for this option. It just
        # takes the nick colors and reverses it. A theme can still specify a
        # fixed color if need be.
        COLOR_HIGHLIGHT_NICK = "reverse"

        # Color of the participant JID in a MUC
        COLOR_MUC_JID = (4, -1)

        # User list color
        COLOR_USER_VISITOR = (239, -1)
        COLOR_USER_PARTICIPANT = (4, -1)
        COLOR_USER_NONE = (0, -1)
        COLOR_USER_MODERATOR = (1, -1)

        # nickname colors
        COLOR_REMOTE_USER = (5, -1)

        # The character printed in color (COLOR_STATUS_*) before the nickname
        # in the user list
        CHAR_STATUS = '|'

        # The characters used for the chatstates in the user list
        # in a MUC
        CHAR_CHATSTATE_ACTIVE = 'A'
        CHAR_CHATSTATE_COMPOSING = 'X'
        CHAR_CHATSTATE_PAUSED = 'p'

        # These characters are used for the affiliation wherever needed, e.g., in
        # the user list in a MUC, or when displaying affiliation lists.
        CHAR_AFFILIATION_OWNER = '~'
        CHAR_AFFILIATION_ADMIN = '&'
        CHAR_AFFILIATION_MEMBER = '+'
        CHAR_AFFILIATION_NONE = '-'
        CHAR_AFFILIATION_OUTCAST = '!'

        # XML Tab
        CHAR_XML_IN = 'IN '
        CHAR_XML_OUT = 'OUT'
        COLOR_XML_IN = (1, -1)
        COLOR_XML_OUT = (2, -1)

        # Color for the /me message
        COLOR_ME_MESSAGE = (6, -1)

        # Color for the number of revisions of a message
        COLOR_REVISIONS_MESSAGE = (3, -1, 'b')

        # Color for various important text. For example the "?" before JIDs in
        # the roster that require a user action.
        COLOR_IMPORTANT_TEXT = (3, 5, 'b')

        # Separators
        COLOR_VERTICAL_SEPARATOR = (4, -1)
        COLOR_NEW_TEXT_SEPARATOR = (2, -1)
        COLOR_MORE_INDICATOR = (6, 4)

        # Time
        CHAR_TIME_LEFT = ''
        CHAR_TIME_RIGHT = ''
        COLOR_TIME_STRING = (-1, -1)

        # Tabs
        COLOR_TAB_NORMAL = (7, 4)
        COLOR_TAB_NONEMPTY = (7, 4)
        COLOR_TAB_SCROLLED = (5, 4)
        COLOR_TAB_JOINED = (82, 4)
        COLOR_TAB_CURRENT = (7, 6)
        COLOR_TAB_COMPOSING = (7, 5)
        COLOR_TAB_NEW_MESSAGE = (7, 5)
        COLOR_TAB_HIGHLIGHT = (7, 3)
        COLOR_TAB_PRIVATE = (7, 2)
        COLOR_TAB_ATTENTION = (7, 1)
        COLOR_TAB_DISCONNECTED = (7, 8)

        # If autocolor_tab_names is set to true, the following modes are used to
        # distinguish tabs with normal and important messages.
        MODE_TAB_NORMAL = ''
        MODE_TAB_IMPORTANT = 'r'  # reverse video mode

        # This is the mode used for the tab name in the info bar of MUC and 1:1
        # chat tabs.
        MODE_TAB_NAME = 'r'

        COLOR_VERTICAL_TAB_NORMAL = (4, -1)
        COLOR_VERTICAL_TAB_NONEMPTY = (4, -1)
        COLOR_VERTICAL_TAB_JOINED = (82, -1)
        COLOR_VERTICAL_TAB_SCROLLED = (66, -1)
        COLOR_VERTICAL_TAB_CURRENT = (7, 4)
        COLOR_VERTICAL_TAB_NEW_MESSAGE = (5, -1)
        COLOR_VERTICAL_TAB_COMPOSING = (5, -1)
        COLOR_VERTICAL_TAB_HIGHLIGHT = (3, -1)
        COLOR_VERTICAL_TAB_PRIVATE = (2, -1)
        COLOR_VERTICAL_TAB_ATTENTION = (1, -1)
        COLOR_VERTICAL_TAB_DISCONNECTED = (8, -1)

        # yapf: disable

        # Nickname colors
        # A list of colors randomly attributed to nicks in MUCs
        # Setting more colors makes it harder to have two nicks with the same color,
        # avoiding confusions.
        LIST_COLOR_NICKNAMES = [
                (1, -1), (2, -1), (3, -1), (4, -1), (5, -1), (6, -1), (9, -1),
                (10, -1), (11, -1), (12, -1), (13, -1), (14, -1), (19, -1),
                (20, -1), (21, -1), (22, -1), (23, -1), (24, -1), (25, -1),
                (26, -1), (27, -1), (28, -1), (29, -1), (30, -1), (31, -1),
                (32, -1), (33, -1), (34, -1), (35, -1), (36, -1), (37, -1),
                (38, -1), (39, -1), (40, -1), (41, -1), (42, -1), (43, -1),
                (44, -1), (45, -1), (46, -1), (47, -1), (48, -1), (49, -1),
                (50, -1), (51, -1), (54, -1), (55, -1), (56, -1), (57, -1),
                (58, -1), (60, -1), (61, -1), (62, -1), (63, -1), (64, -1),
                (65, -1), (66, -1), (67, -1), (68, -1), (69, -1), (70, -1),
                (71, -1), (72, -1), (73, -1), (74, -1), (75, -1), (76, -1),
                (77, -1), (78, -1), (79, -1), (80, -1), (81, -1), (82, -1),
                (83, -1), (84, -1), (85, -1), (86, -1), (87, -1), (88, -1),
                (89, -1), (90, -1), (91, -1), (92, -1), (93, -1), (94, -1),
                (95, -1), (96, -1), (97, -1), (98, -1), (99, -1), (100, -1),
                (101, -1), (103, -1), (104, -1), (105, -1), (106, -1), (107, -1),
                (108, -1), (109, -1), (110, -1), (111, -1), (112, -1), (113, -1),
                (114, -1), (115, -1), (116, -1), (117, -1), (118, -1), (119, -1),
                (120, -1), (121, -1), (122, -1), (123, -1), (124, -1), (125, -1),
                (126, -1), (127, -1), (128, -1), (129, -1), (130, -1), (131, -1),
                (132, -1), (133, -1), (134, -1), (135, -1), (136, -1), (137, -1),
                (138, -1), (139, -1), (140, -1), (141, -1), (142, -1), (143, -1),
                (144, -1), (145, -1), (146, -1), (147, -1), (148, -1), (149, -1),
                (150, -1), (151, -1), (152, -1), (153, -1), (154, -1), (155, -1),
                (156, -1), (157, -1), (158, -1), (159, -1), (160, -1), (161, -1),
                (162, -1), (163, -1), (164, -1), (165, -1), (166, -1), (167, -1),
                (168, -1), (169, -1), (170, -1), (171, -1), (172, -1), (173, -1),
                (174, -1), (175, -1), (176, -1), (177, -1), (178, -1), (179, -1),
                (180, -1), (181, -1), (182, -1), (183, -1), (184, -1), (185, -1),
                (186, -1), (187, -1), (188, -1), (189, -1), (190, -1), (191, -1),
                (192, -1), (193, -1), (196, -1), (197, -1), (198, -1), (199, -1),
                (200, -1), (201, -1), (202, -1), (203, -1), (204, -1), (205, -1),
                (206, -1), (207, -1), (208, -1), (209, -1), (210, -1), (211, -1),
                (212, -1), (213, -1), (214, -1), (215, -1), (216, -1), (217, -1),
                (218, -1), (219, -1), (220, -1), (221, -1), (222, -1), (223, -1),
                (224, -1), (225, -1), (226, -1), (227, -1)]
        # XEP-0392 consistent color generation palette placeholder
        # it’s generated on first use when accessing the ccg_palette property
        CCG_PALETTE: Optional[Dict[float, int]] = None
        CCG_Y = 0.5**0.45

        # yapf: enable

        # This is your own nickname
        COLOR_OWN_NICK = (254, -1)

        COLOR_LOG_MSG = (5, -1)
        # This is for in-tab error messages
        COLOR_ERROR_MSG = (9, 7, 'b')
        # Status color
        COLOR_STATUS_XA = (16, 90)
        COLOR_STATUS_NONE = (16, 4)
        COLOR_STATUS_DND = (16, 1)
        COLOR_STATUS_AWAY = (16, 3)
        COLOR_STATUS_CHAT = (16, 2)
        COLOR_STATUS_UNAVAILABLE = (-1, 247)
        COLOR_STATUS_ONLINE = (16, 4)

        # Bars
        COLOR_WARNING_PROMPT = (16, 1, 'b')
        COLOR_INFORMATION_BAR = (7, 4)
        COLOR_TOPIC_BAR = (7, 4)
        COLOR_SCROLLABLE_NUMBER = (220, 4, 'b')
        COLOR_SELECTED_ROW = (-1, 33)
        COLOR_PRIVATE_NAME = (-1, 4)
        COLOR_CONVERSATION_NAME = (2, 4)
        COLOR_CONVERSATION_RESOURCE = (121, 4)
        COLOR_GROUPCHAT_NAME = (7, 4)
        COLOR_COLUMN_HEADER = (36, 4)
        COLOR_COLUMN_HEADER_SEL = (4, 36)

        # Strings for special messages (like join, quit, nick change, etc)
        CHAR_BEFORE_NICK_ME = '* '
        CHAR_AFTER_NICK_ME = ' '
        CHAR_AFTER_NICK = '> '
        CHAR_JOIN = '--->'
        CHAR_QUIT = '<---'
        CHAR_KICK = '-!-'
        CHAR_NEW_TEXT_SEPARATOR = '- '
        CHAR_OK = '✔'
        CHAR_ERROR = '✖'
        CHAR_EMPTY = ' '
        CHAR_ACK_RECEIVED = CHAR_OK
        CHAR_NACK = CHAR_ERROR
        CHAR_COLUMN_ASC = ' ▲'
        CHAR_COLUMN_DESC = ' ▼'
        CHAR_ROSTER_ERROR = CHAR_ERROR
        CHAR_ROSTER_TUNE = '♪'
        CHAR_ROSTER_ASKED = '?'
        CHAR_ROSTER_ACTIVITY = 'A'
        CHAR_ROSTER_MOOD = 'M'
        CHAR_ROSTER_GAMING = 'G'
        CHAR_ROSTER_FROM = '←'
        CHAR_ROSTER_BOTH = '↔'
        CHAR_ROSTER_TO = '→'
        CHAR_ROSTER_NONE = '⇹'

        COLOR_CHAR_ACK = (2, -1)
        COLOR_CHAR_NACK = (1, -1)

        COLOR_ROSTER_GAMING = (6, -1)
        COLOR_ROSTER_MOOD = (2, -1)
        COLOR_ROSTER_ACTIVITY = (3, -1)
        COLOR_ROSTER_TUNE = (6, -1)
        COLOR_ROSTER_ERROR = (1, -1)
        COLOR_ROSTER_SUBSCRIPTION = (-1, -1)

        COLOR_JOIN_CHAR = (4, -1)
        COLOR_QUIT_CHAR = (1, -1)
        COLOR_KICK_CHAR = (1, -1)

        # Vertical tab list color
        COLOR_VERTICAL_TAB_NUMBER = (34, -1)

        # Info messages color (the part before the ">")
        INFO_COLORS = {
            'info': (5, -1),
            'error': (9, 7, 'b'),
            'warning': (1, -1),
            'roster': (2, -1),
            'help': (10, -1),
            'headline': (11, -1, 'b'),
            'tune': (6, -1),
            'gaming': (6, -1),
            'mood': (2, -1),
            'activity': (3, -1),
            'default': (7, -1),
        }

        @property
        def ccg_palette(self) -> Optional[Dict[float, int]]:
            prepare_ccolor_palette(self)
            return self.CCG_PALETTE

    # This is the default theme object, used if no theme is defined in the conf
    theme = Theme()

    # a dict "color tuple -> color_pair"
    # Each time we use a color tuple, we check if it has already been used.
    # If not we create a new color_pair and keep it in that dict, to use it
    # the next time.
    curses_colors_dict: Dict[Union[Tuple[int, int], Tuple[int, int, str]], int] = {}

    # yapf: disable

    table_256_to_16 = [
             0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
             0,  4,  4,  4, 12, 12,  2,  6,  4,  4, 12, 12,  2,  2,  6,  4,
            12, 12,  2,  2,  2,  6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10,
            10, 10, 10, 14,  1,  5,  4,  4, 12, 12,  3,  8,  4,  4, 12, 12,
             2,  2,  6,  4, 12, 12,  2,  2,  2,  6, 12, 12, 10, 10, 10, 10,
            14, 12, 10, 10, 10, 10, 10, 14,  1,  1,  5,  4, 12, 12,  1,  1,
             5,  4, 12, 12,  3,  3,  8,  4, 12, 12,  2,  2,  2,  6, 12, 12,
            10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14,  1,  1,  1,  5,
            12, 12,  1,  1,  1,  5, 12, 12,  1,  1,  1,  5, 12, 12,  3,  3,
             3,  7, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14,
             9,  9,  9,  9, 13, 12,  9,  9,  9,  9, 13, 12,  9,  9,  9,  9,
            13, 12,  9,  9,  9,  9, 13, 12, 11, 11, 11, 11,  7, 12, 10, 10,
            10, 10, 10, 14,  9,  9,  9,  9,  9, 13,  9,  9,  9,  9,  9, 13,
             9,  9,  9,  9,  9, 13,  9,  9,  9,  9,  9, 13,  9,  9,  9,  9,
             9, 13, 11, 11, 11, 11, 11, 15,  0,  0,  0,  0,  0,  0,  8,  8,
             8,  8,  8,  8,  7,  7,  7,  7,  7,  7, 15, 15, 15, 15, 15, 15
    ]
    # yapf: enable

    load_path: List[str] = []

    def color_256_to_16(color):
        if color == -1:
            return color
        return table_256_to_16[color]

    def dump_tuple(tup: Union[Tuple[int, int], Tuple[int, int, str]]) -> str:
        """
        Dump a tuple to a string of fg,bg,attr (optional)
        """
        return ','.join(str(i) for i in tup)

    def read_tuple(_str: str) -> Tuple[Tuple[int, int], str]:
        """
        Read a tuple dumped with dump_tumple
        """
        attrs = _str.split(',')
        char = attrs[2] if len(attrs) > 2 else '\0'
        return (int(attrs[0]), int(attrs[1])), char

    @functools.lru_cache(maxsize=128)
    def to_curses_attr(
            color_tuple: Union[Tuple[int, int], Tuple[int, int, str]]) -> int:
        """
        Takes a color tuple (as defined at the top of this file) and
        returns a valid curses attr that can be passed directly to attron() or attroff()
        """
        # extract the color from that tuple
        colors: Union[Tuple[int, int], Tuple[int, int, str]]
        if len(color_tuple) == 3:
            colors = (color_tuple[0], color_tuple[1])
        else:
            colors = color_tuple

        bold = False
        if curses.COLORS < 256:
            # We are not in a term supporting 256 colors, so we convert
            # colors to numbers between -1 and 8
            colors = (color_256_to_16(colors[0]), color_256_to_16(colors[1]))
            if colors[0] >= 8:
                colors = (colors[0] - 8, colors[1])
                bold = True
            if colors[1] >= 8:
                colors = (colors[0], colors[1] - 8)

        # check if we already used these colors
        try:
            pair = curses_colors_dict[colors]
        except KeyError:
            pair = len(curses_colors_dict) + 1
            curses.init_pair(pair, colors[0], colors[1])
            curses_colors_dict[colors] = pair
        curses_pair = curses.color_pair(pair)
        if len(color_tuple) == 3:
            _, _, additional_val = cast(Tuple[int, int, str], color_tuple)
            if 'b' in additional_val or bold is True:
                curses_pair = curses_pair | curses.A_BOLD
            if 'u' in additional_val:
                curses_pair = curses_pair | curses.A_UNDERLINE
            if 'i' in additional_val:
                curses_pair = curses_pair | (curses.A_ITALIC if hasattr(
                    curses, 'A_ITALIC') else curses.A_REVERSE)
            if 'a' in additional_val:
                curses_pair = curses_pair | curses.A_BLINK
            if 'r' in additional_val:
                curses_pair = curses_pair | curses.A_REVERSE
        return curses_pair

    def get_theme() -> Theme:
        """
        Returns the current theme
        """
        return theme

    def update_themes_dir(option: Optional[str] = None,
                          value: Optional[str] = None):
        global load_path
        load_path = []

        # import from the git sources
        default_dir = path.join(
            path.dirname(path.dirname(__file__)), 'data/themes')
        if path.exists(default_dir):
            load_path.append(default_dir)

        # import from the user-defined prefs
        themes_dir_str = config.getstr('themes_dir')
        themes_dir = Path(themes_dir_str).expanduser(
        ) if themes_dir_str else xdg.DATA_HOME / 'themes'
        try:
            themes_dir.mkdir(parents=True, exist_ok=True)
        except OSError:
            log.exception('Unable to create the themes dir (%s):', themes_dir)
        else:
            load_path.append(str(themes_dir))

        # system-wide import
        try:
            import poezio_themes
        except ImportError:
            pass
        else:
            if poezio_themes.__path__:
                load_path.append(list(poezio_themes.__path__)[0])

        log.debug('Theme load path: %s', load_path)

    def prepare_ccolor_palette(theme: Theme) -> None:
        """
        Prepare the Consistent Color Generation (XEP-0392) palette for a theme.
        """
        if theme.CCG_PALETTE is not None:
            return None

        if any(bg != -1 for fg, bg in theme.LIST_COLOR_NICKNAMES):
            # explicitly disable CCG, can’t handle dynamic background colors
            theme.CCG_PALETTE = {}
            return None

        theme.CCG_PALETTE = colors.generate_ccg_palette(
            [
                fg for fg, _ in theme.LIST_COLOR_NICKNAMES
                # exclude grayscale
                if fg < 232
            ],
            theme.CCG_Y,
        )
        return None

    def reload_theme() -> Optional[str]:
        theme_name = config.getstr('theme')
        global theme
        if theme_name == 'default' or not theme_name.strip():
            theme = Theme()
            return None
        new_theme = None
        exc = None
        try:
            spec = finder.find_spec(theme_name, path=load_path)
            if not spec or not spec.loader:
                return 'Failed to load the theme %s' % theme_name
            new_theme = spec.loader.load_module(theme_name)
        except Exception as e:
            log.error('Failed to load the theme %s', theme_name, exc_info=True)
            exc = e

        if not new_theme:
            return 'Failed to load theme: %s' % exc

        if hasattr(new_theme, 'theme'):
            theme = new_theme.theme  # type: ignore
            prepare_ccolor_palette(theme)
            return None
        return 'No theme present in the theme file'

    if __name__ == '__main__':
        # Display some nice text with nice colors
        s = curses.initscr()
        curses.start_color()
        curses.use_default_colors()
        s.addstr('%s colors detected\n\n' % curses.COLORS, to_curses_attr((3, -1)))
        for i in range(curses.COLORS):
            s.addstr('%s ' % i, to_curses_attr((i, -1)))
        s.addstr('\n')
        s.refresh()
        try:
            s.getkey()
        except KeyboardInterrupt:
            pass
        finally:
            curses.endwin()
            print()