poezio/src/theming.py

# 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 zlib 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.
We check the number of available colors at startup, and we load a theme accordingly.
A 8 color theme should NEVER use colors not in the -1 -> 7 range. We won't check that
at run time. If the case occurs, the THEME should be fixed.
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.
So, 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 characteres:
'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:

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 list one color tuple.
It is used for example to define color gradient, etc.
"""

import logging
log = logging.getLogger(__name__)

from config import config

import curses
import imp
import os

class Theme(object):
    """
    The theme class, from which all theme should inherit.
    All of the following value 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.
    """
    # Message text color
    COLOR_NORMAL_TEXT = (-1, -1)
    COLOR_INFORMATION_TEXT = (137, -1) # TODO
    COLOR_HIGHLIGHT_NICK = (3, 5, 'b')

    # User list color
    COLOR_USER_VISITOR = (0, -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'

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

    # Time
    COLOR_TIME_SEPARATOR = (106, -1)
    COLOR_TIME_LIMITER = (0, -1)
    CHAR_TIME_LEFT = ''
    CHAR_TIME_RIGHT = ''
    COLOR_TIME_NUMBERS = (0, -1)

    # Tabs
    COLOR_TAB_NORMAL = (7, 4)
    COLOR_TAB_CURRENT = (7, 6)
    COLOR_TAB_NEW_MESSAGE = (7, 5)
    COLOR_TAB_HIGHLIGHT = (7, 1)
    COLOR_TAB_PRIVATE = (7, 2)
    COLOR_TAB_DISCONNECTED = (7, 8)

    COLOR_VERTICAL_TAB_NORMAL = (4, -1)
    COLOR_VERTICAL_TAB_CURRENT = (7, 4)
    COLOR_VERTICAL_TAB_NEW_MESSAGE = (5, -1)
    COLOR_VERTICAL_TAB_HIGHLIGHT = (1, -1)
    COLOR_VERTICAL_TAB_PRIVATE = (2, -1)
    COLOR_VERTICAL_TAB_DISCONNECTED = (8, -1)

    # 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), (8, -1), (9, -1), (10, -1), (11, -1), (12, -1), (13, -1), (14, -1), (23, -1), (23, -1), (88, -1), (99, -1), (100, -1), (154, -1), (213, -1), (216, -1), (227, -1)]
    # This is your own nickname
    COLOR_OWN_NICK = (254, -1)

    # 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_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_GROUPCHAT_NAME = (7, 4)
    COLOR_COLUMN_HEADER = (36, 4)

    # Strings for special messages (like join, quit, nick change, etc)
    # Special messages
    CHAR_JOIN = '--->'
    CHAR_QUIT = '<---'
    CHAR_KICK = '-!-'

    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)

# 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 = {}

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
]

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

def to_curses_attr(color_tuple):
    """
    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
    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 = color_tuple[2]
        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 'a' in additional_val:
            curses_pair = curses_pair | curses.A_BLINK
    return curses_pair

def get_theme():
    """
    Returns the current theme
    """
    return theme

def reload_theme():
    themes_dir = config.get('themes_dir', '')
    themes_dir = themes_dir or\
        os.path.join(os.environ.get('XDG_DATA_HOME') or\
                         os.path.join(os.environ.get('HOME'), '.local', 'share'),
                     'poezio', 'themes')
    themes_dir = os.path.expanduser(themes_dir)
    try:
        os.makedirs(themes_dir)
    except OSError:
        pass
    theme_name = config.get('theme', 'default')
    global theme
    if theme_name == 'default' or not theme_name.strip():
        theme = Theme()
        return
    try:
        file_path  = os.path.join(themes_dir, theme_name)+'.py'
        log.debug('Theme file to load: %s' %(file_path,))
        new_theme = imp.load_source('theme', os.path.join(themes_dir, theme_name)+'.py')
    except:
        return 'Theme not found'
    theme = new_theme.theme

if __name__ == '__main__':
    """
    Display some nice text with nice colors
    """
    s = curses.initscr()
    curses.start_color()
    curses.use_default_colors()
    s.addstr('%s' % curses.COLORS, to_curses_attr((3, -1, 'a')))
    s.refresh()
    s.getkey()
    curses.endwin()