path: root/src/windows.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 all the windows.
A window is a little part of the screen, for example the input window,
the text window, the roster window, etc.
A Tab (see tab.py) is composed of multiple Windows
"""

import logging
log = logging.getLogger(__name__)

import collections
import curses
import string
from datetime import datetime
from math import ceil, log10
from threading import RLock


import common
import core
import poopt
import singleton
from common import safeJID
from config import config
from contact import Contact, Resource
from roster import RosterGroup
from theming import get_theme, to_curses_attr, read_tuple, dump_tuple
from user import ROLE_DICT


FORMAT_CHAR = '\x19'
# These are non-printable chars, so they should never appear in the input,
# I guess. But maybe we can find better chars that are even less risky.
format_chars = ['\x0E', '\x0F', '\x10', '\x11', '\x12', '\x13',
                '\x14', '\x15', '\x16', '\x17', '\x18']

# different colors allowed in the input
allowed_color_digits = ('0', '1', '2', '3', '4', '5', '6', '7')

# msg is a reference to the corresponding Message tuple. text_start and
# text_end are the position delimiting the text in this line.
Line = collections.namedtuple('Line', 'msg start_pos end_pos prepend')

g_lock = RLock()

LINES_NB_LIMIT = 4096

def find_first_format_char(text):
    pos = -1
    for char in format_chars:
        p = text.find(char)
        if p == -1:
            continue
        if pos == -1 or p < pos:
            pos = p
    return pos

def truncate_nick(nick, size=None):
    size = size or config.get('max_nick_length', 25)
    if size < 1:
        size = 1
    if nick and len(nick) > size:
        return nick[:size]+'…'
    return nick

def parse_attrs(text, previous=None):
    next_attr_char = text.find(FORMAT_CHAR)
    if previous:
        attrs = previous
    else:
        attrs = []
    while next_attr_char != -1 and text:
        if next_attr_char + 1 < len(text):
            attr_char = text[next_attr_char+1].lower()
        else:
            attr_char = str()
        if attr_char == 'o':
            attrs = []
        elif attr_char == 'u':
            attrs.append('u')
        elif attr_char == 'b':
            attrs.append('b')
        if attr_char in string.digits and attr_char != '':
            color_str = text[next_attr_char+1:text.find('}', next_attr_char)]
            if color_str:
                attrs.append(color_str + '}')
            text = text[next_attr_char+len(color_str)+2:]
        else:
            text = text[next_attr_char+2:]
        next_attr_char = text.find(FORMAT_CHAR)
    return attrs


class Win(object):
    _win_core = None
    _tab_win = None
    def __init__(self):
        self._win = None

    def _resize(self, height, width, y, x):
        if height == 0 or width == 0:
            self.height, self.width = height, width
            return
        self.height, self.width, self.x, self.y = height, width, x, y
        try:
            self._win = Win._tab_win.derwin(height, width, y, x)
        except:
            log.debug('DEBUG: mvwin returned ERR. Please investigate')

        # If this ever fail, uncomment that ^

    def resize(self, height, width, y, x):
        """
        Override if something has to be done on resize
        """
        with g_lock:
            self._resize(height, width, y, x)

    def _refresh(self):
        self._win.noutrefresh()

    def addnstr(self, *args):
        """
        Safe call to addnstr
        """
        try:
            self._win.addnstr(*args)
        except:
            # this actually mostly returns ERR, but works.
            # more specifically, when the added string reaches the end
            # of the screen.
            pass

    def addstr(self, *args):
        """
        Safe call to addstr
        """
        try:
            self._win.addstr(*args)
        except:
            pass

    def move(self, y, x):
        try:
            self._win.move(y, x)
        except:
            self._win.move(0, 0)

    def addstr_colored(self, text, y=None, x=None):
        """
        Write a string on the window, setting the
        attributes as they are in the string.
        For example:
        \x19bhello → hello in bold
        \x191}Bonj\x192}our → 'Bonj' in red and 'our' in green
        next_attr_char is the \x19 delimiter
        attr_char is the char following it, it can be
        one of 'u', 'b', 'c[0-9]'
        """
        if y is not None and x is not None:
            self.move(y, x)
        next_attr_char = text.find(FORMAT_CHAR)
        while next_attr_char != -1 and text:
            if next_attr_char + 1 < len(text):
                attr_char = text[next_attr_char+1].lower()
            else:
                attr_char = str()
            if next_attr_char != 0:
                self.addstr(text[:next_attr_char])
            if attr_char == 'o':
                self._win.attrset(0)
            elif attr_char == 'u':
                self._win.attron(curses.A_UNDERLINE)
            elif attr_char == 'b':
                self._win.attron(curses.A_BOLD)
            if (attr_char in string.digits or attr_char == '-') and attr_char != '':
                color_str = text[next_attr_char+1:text.find('}', next_attr_char)]
                if ',' in color_str:
                    tup, char = read_tuple(color_str)
                    self._win.attron(to_curses_attr(tup))
                    if char:
                        if char == 'o':
                            self._win.attrset(0)
                        elif char == 'u':
                            self._win.attron(curses.A_UNDERLINE)
                        elif char == 'b':
                            self._win.attron(curses.A_BOLD)
                elif color_str:
                    self._win.attron(to_curses_attr((int(color_str), -1)))
                text = text[next_attr_char+len(color_str)+2:]
            else:
                text = text[next_attr_char+2:]
            next_attr_char = text.find(FORMAT_CHAR)
        self.addstr(text)

    def finish_line(self, color=None):
        """
        Write colored spaces until the end of line
        """
        (y, x) = self._win.getyx()
        size = self.width - x
        if color:
            self.addnstr(' '*size, size, to_curses_attr(color))
        else:
            self.addnstr(' '*size, size)

    @property
    def core(self):
        if not Win._win_core:
            Win._win_core = singleton.Singleton(core.Core)
        return Win._win_core

class UserList(Win):
    def __init__(self):
        Win.__init__(self)
        self.pos = 0

    def scroll_up(self):
        self.pos += self.height-1
        return True

    def scroll_down(self):
        pos = self.pos
        self.pos -= self.height-1
        if self.pos < 0:
            self.pos = 0
        return self.pos != pos

    def draw_plus(self, y):
        self.addstr(y, self.width-2, '++', to_curses_attr(get_theme().COLOR_MORE_INDICATOR))

    def refresh(self, users):
        log.debug('Refresh: %s', self.__class__.__name__)
        if config.get("hide_user_list", False):
            return # do not refresh if this win is hidden.
        with g_lock:
            self._win.erase()
            if config.get('user_list_sort', 'desc').lower() == 'asc':
                y, x = self._win.getmaxyx()
                y -= 1
                users = sorted(users)
            else:
                y = 0
                users = sorted(users)

            if len(users) < self.height:
                self.pos = 0
            elif self.pos >= len(users) - self.height and self.pos != 0:
                self.pos = len(users) - self.height
            for user in users[self.pos:]:
                self.draw_role_affiliation(y, user)
                self.draw_status_chatstate(y, user)
                self.addstr(y, 2,
                        poopt.cut_by_columns(user.nick, self.width - 2),
                        to_curses_attr(user.color))
                if config.get('user_list_sort', 'desc').lower() == 'asc':
                    y -= 1
                else:
                    y += 1
                if y == self.height:
                    break
            # draw indicators of position in the list
            if self.pos > 0:
                if config.get('user_list_sort', 'desc').lower() == 'asc':
                    self.draw_plus(self.height-1)
                else:
                    self.draw_plus(0)
            if self.pos + self.height < len(users):
                if config.get('user_list_sort', 'desc').lower() == 'asc':
                    self.draw_plus(0)
                else:
                    self.draw_plus(self.height-1)
            self._refresh()

    def draw_role_affiliation(self, y, user):
        theme = get_theme()
        color = theme.color_role(user.role)
        symbol = theme.char_affiliation(user.affiliation)
        self.addstr(y, 1, symbol, to_curses_attr(color))

    def draw_status_chatstate(self, y, user):
        show_col = get_theme().color_show(user.show)
        if user.chatstate == 'composing':
            char = get_theme().CHAR_CHATSTATE_COMPOSING
        elif user.chatstate == 'active':
            char = get_theme().CHAR_CHATSTATE_ACTIVE
        elif user.chatstate == 'paused':
            char = get_theme().CHAR_CHATSTATE_PAUSED
        else:
            char = get_theme().CHAR_STATUS
        self.addstr(y, 0, char, to_curses_attr(show_col))

    def resize(self, height, width, y, x):
        with g_lock:
            separator = to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR)
            self._resize(height, width, y, x)
            self._win.attron(separator)
            self._win.vline(0, 0, curses.ACS_VLINE, self.height)
            self._win.attroff(separator)

class Topic(Win):
    def __init__(self):
        Win.__init__(self)
        self._message = ''

    def refresh(self, topic=None):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            if topic:
                msg = topic[:self.width-1]
            else:
                msg = self._message[:self.width-1]
            self.addstr(0, 0, msg, to_curses_attr(get_theme().COLOR_TOPIC_BAR))
            (y, x) = self._win.getyx()
            remaining_size = self.width - x
            if remaining_size:
                self.addnstr(' '*remaining_size, remaining_size,
                             to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            self._refresh()

    def set_message(self, message):
        self._message = message

class GlobalInfoBar(Win):
    def __init__(self):
        Win.__init__(self)

    def refresh(self):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            self.addstr(0, 0, "[", to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

            create_gaps = config.get('create_gaps', False)
            show_names = config.get('show_tab_names', False)
            show_nums = config.get('show_tab_numbers', True)
            use_nicks = config.get('use_tab_nicks', True)
            # ignore any remaining gap tabs if the feature is not enabled
            if create_gaps:
                sorted_tabs = self.core.tabs[:]
            else:
                sorted_tabs = [tab for tab in self.core.tabs if tab]

            for nb, tab in enumerate(sorted_tabs):
                if not tab: continue
                color = tab.color
                if not config.get('show_inactive_tabs', True) and\
                        color is get_theme().COLOR_TAB_NORMAL:
                    continue
                try:
                    if show_nums or not show_names:
                        self.addstr("%s" % str(nb), to_curses_attr(color))
                        if show_names:
                            self.addstr(' ', to_curses_attr(color))
                    if show_names:
                        if use_nicks:
                            self.addstr("%s" % str(tab.get_nick()), to_curses_attr(color))
                        else:
                            self.addstr("%s" % str(tab.get_name()), to_curses_attr(color))
                    self.addstr("|", to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
                except:             # end of line
                    break
            (y, x) = self._win.getyx()
            self.addstr(y, x-1, '] ', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            (y, x) = self._win.getyx()
            remaining_size = self.width - x
            self.addnstr(' '*remaining_size, remaining_size,
                         to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            self._refresh()

class VerticalGlobalInfoBar(Win):
    def __init__(self, scr):
        Win.__init__(self)
        self._win = scr

    def refresh(self):
        with g_lock:
            height, width = self._win.getmaxyx()
            self._win.erase()
            sorted_tabs = [tab for tab in self.core.tabs if tab]
            if not config.get('show_inactive_tabs', True):
                sorted_tabs = [tab for tab in sorted_tabs if\
                                   tab.vertical_color != get_theme().COLOR_VERTICAL_TAB_NORMAL]
            nb_tabs = len(sorted_tabs)
            use_nicks = config.get('use_tab_nicks', True)
            if nb_tabs >= height:
                for y, tab in enumerate(sorted_tabs):
                    if tab.vertical_color == get_theme().COLOR_VERTICAL_TAB_CURRENT:
                        pos = y
                        break
                # center the current tab as much as possible
                if pos < height//2:
                    sorted_tabs = sorted_tabs[:height]
                elif nb_tabs - pos <= height//2:
                    sorted_tabs = sorted_tabs[-height:]
                else:
                    sorted_tabs = sorted_tabs[pos-height//2 : pos+height//2]
            for y, tab in enumerate(sorted_tabs):
                color = tab.vertical_color

                if not config.get('vertical_tab_list_sort', 'desc') != 'asc':
                    y = height - y - 1
                self.addstr(y, 0, "%2d" % tab.nb,
                        to_curses_attr(get_theme().COLOR_VERTICAL_TAB_NUMBER))
                self.addstr('.')
                if use_nicks:
                    self.addnstr("%s" % tab.get_nick(), width - 4, to_curses_attr(color))
                else:
                    self.addnstr("%s" % tab.get_name(), width - 4, to_curses_attr(color))
            separator = to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR)
            self._win.attron(separator)
            self._win.vline(0, width-1, curses.ACS_VLINE, height)
            self._win.attroff(separator)
            self._refresh()

class InfoWin(Win):
    """
    Base class for all the *InfoWin, used in various tabs. For example
    MucInfoWin, etc. Provides some useful methods.
    """
    def __init__(self):
        Win.__init__(self)

    def print_scroll_position(self, window):
        """
        Print, like in Weechat, a -MORE(n)- where n
        is the number of available lines to scroll
        down
        """
        if window.pos > 0:
            plus = ' -MORE(%s)-' % window.pos
            self.addstr(plus, to_curses_attr(get_theme().COLOR_SCROLLABLE_NUMBER))

class XMLInfoWin(InfoWin):
    """
    Info about the latest xml filter used and the state of the buffer.
    """
    def __init__(self):
        InfoWin.__init__(self)

    def refresh(self, filter_t='', filter='', window=None):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            bar = to_curses_attr(get_theme().COLOR_INFORMATION_BAR)
            if not filter_t:
                self.addstr('[No filter]', bar)
            else:
                info = '[%s] %s' % (filter_t, filter)
                self.addstr(info, bar)
            self.print_scroll_position(window)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

class PrivateInfoWin(InfoWin):
    """
    The line above the information window, displaying informations
    about the MUC user we are talking to
    """
    def __init__(self):
        InfoWin.__init__(self)

    def refresh(self, name, window, chatstate, informations):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            self.write_room_name(name)
            self.print_scroll_position(window)
            self.write_chatstate(chatstate)
            self.write_additional_informations(informations, name)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def write_additional_informations(self, informations, jid):
        """
        Write all informations added by plugins by getting the
        value returned by the callbacks.
        """
        for key in informations:
            self.addstr(informations[key](jid), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_room_name(self, name):
        jid = safeJID(name)
        room_name, nick = jid.bare, jid.resource
        self.addstr(nick, to_curses_attr(get_theme().COLOR_PRIVATE_NAME))
        txt = ' from room %s' % room_name
        self.addstr(txt, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_chatstate(self, state):
        if state:
            self.addstr(' %s' % (state,), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

class MucListInfoWin(InfoWin):
    """
    The live above the information window, displaying informations
    about the muc server being listed
    """
    def __init__(self, message=''):
        InfoWin.__init__(self)
        self.message = message

    def refresh(self, name=None, window=None):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            if name:
                self.addstr(name, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            else:
                self.addstr(self.message, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            if window:
                self.print_scroll_position(window)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

class ConversationInfoWin(InfoWin):
    """
    The line above the information window, displaying informations
    about the user we are talking to
    """

    def __init__(self):
        InfoWin.__init__(self)

    def refresh(self, jid, contact, window, chatstate, informations):
        # contact can be None, if we receive a message
        # from someone not in our roster. In this case, we display
        # only the maximum information from the message we can get.
        log.debug('Refresh: %s', self.__class__.__name__)
        jid = safeJID(jid)
        if contact:
            if jid.resource:
                resource = contact[jid.full]
            else:
                resource = contact.get_highest_priority_resource()
        else:
            resource = None
        # if contact is None, then resource is None too:
        # user is not in the roster so we know almost nothing about it
        # If contact is a Contact, then
        # resource can now be a Resource: user is in the roster and online
        # or resource is None: user is in the roster but offline
        with g_lock:
            self._win.erase()
            self.write_contact_jid(jid)
            self.write_contact_informations(contact)
            self.write_resource_information(resource)
            self.print_scroll_position(window)
            self.write_chatstate(chatstate)
            self.write_additional_informations(informations, jid)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def write_additional_informations(self, informations, jid):
        """
        Write all informations added by plugins by getting the
        value returned by the callbacks.
        """
        for key in informations:
            self.addstr(informations[key](jid),
                    to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_resource_information(self, resource):
        """
        Write the informations about the resource
        """
        if not resource:
            presence = "unavailable"
        else:
            presence = resource.presence
        color = get_theme().color_show(presence)
        self.addstr('[', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.addstr(get_theme().CHAR_STATUS, to_curses_attr(color))
        self.addstr(']', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_contact_informations(self, contact):
        """
        Write the informations about the contact
        """
        if not contact:
            self.addstr("(contact not in roster)", to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            return
        display_name = contact.name
        if display_name:
            self.addstr('%s '%(display_name), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_contact_jid(self, jid):
        """
        Just write the jid that we are talking to
        """
        self.addstr('[', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.addstr(jid.full, to_curses_attr(get_theme().COLOR_CONVERSATION_NAME))
        self.addstr('] ', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_chatstate(self, state):
        if state:
            self.addstr(' %s' % (state,), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

class DynamicConversationInfoWin(ConversationInfoWin):
    def write_contact_jid(self, jid):
        """
        Just displays the resource in an other color
        """
        log.debug("write_contact_jid DynamicConversationInfoWin, jid: %s",
                jid.resource)
        self.addstr('[', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.addstr(jid.bare, to_curses_attr(get_theme().COLOR_CONVERSATION_NAME))
        if jid.resource:
            self.addstr("/%s" % (jid.resource,), to_curses_attr(get_theme().COLOR_CONVERSATION_RESOURCE))
        self.addstr('] ', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

class ConversationStatusMessageWin(InfoWin):
    """
    The upper bar displaying the status message of the contact
    """
    def __init__(self):
        InfoWin.__init__(self)

    def refresh(self, jid, contact):
        log.debug('Refresh: %s', self.__class__.__name__)
        jid = safeJID(jid)
        if contact:
            if jid.resource:
                resource = contact[jid.full]
            else:
                resource = contact.get_highest_priority_resource()
        else:
            resource = None
        with g_lock:
            self._win.erase()
            if resource:
                self.write_status_message(resource)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def write_status_message(self, resource):
        self.addstr(resource.status, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

class MucInfoWin(InfoWin):
    """
    The line just above the information window, displaying informations
    about the MUC we are viewing
    """
    def __init__(self):
        InfoWin.__init__(self)

    def refresh(self, room, window=None):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            self.write_room_name(room)
            self.write_participants_number(room)
            self.write_own_nick(room)
            self.write_disconnected(room)
            self.write_role(room)
            if window:
                self.print_scroll_position(window)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def write_room_name(self, room):
        self.addstr('[', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.addstr(room.name, to_curses_attr(get_theme().COLOR_GROUPCHAT_NAME))
        self.addstr(']', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_participants_number(self, room):
        self.addstr('{', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.addstr(str(len(room.users)), to_curses_attr(get_theme().COLOR_GROUPCHAT_NAME))
        self.addstr('} ', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_disconnected(self, room):
        """
        Shows a message if the room is not joined
        """
        if not room.joined:
            self.addstr(' -!- Not connected ', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_own_nick(self, room):
        """
        Write our own nick in the info bar
        """
        nick = room.own_nick
        if not nick:
            return
        self.addstr(truncate_nick(nick, 13), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_role(self, room):
        """
        Write our own role and affiliation
        """
        own_user = None
        for user in room.users:
            if user.nick == room.own_nick:
                own_user = user
                break
        if not own_user:
            return
        txt = ' ('
        if own_user.affiliation != 'none':
            txt += own_user.affiliation+', '
        txt += own_user.role+')'
        self.addstr(txt, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

class TextWin(Win):
    def __init__(self, lines_nb_limit=config.get('max_lines_in_memory', 2048)):
        Win.__init__(self)
        self.lines_nb_limit = lines_nb_limit
        self.pos = 0
        self.built_lines = []   # Each new message is built and kept here.
        # on resize, we rebuild all the messages

        self.lock = False
        self.lock_buffer = []

        # the Lines of the highlights in that buffer
        self.highlights = []
        # the current HL position in that list NaN means that we’re not on
        # an hl. -1 is a valid position (it's before the first hl of the
        # list. i.e the separator, in the case where there’s no hl before
        # it.)
        self.hl_pos = float('nan')

        # Keep track of the number of hl after the separator.
        # This is useful to make “go to next highlight“ work after a “move to separator”.
        self.nb_of_highlights_after_separator = 0

        self.separator_after = None

    def toggle_lock(self):
        if self.lock:
            self.release_lock()
        else:
            self.acquire_lock()
        return self.lock

    def acquire_lock(self):
        self.lock = True

    def release_lock(self):
        for line in self.lock_buffer:
            self.built_lines.append(line)
        self.lock = False

    def next_highlight(self):
        """
        Go to the next highlight in the buffer.
        (depending on which highlight was selected before)
        if the buffer is already positionned on the last, of if there are no
        highlights, scroll to the end of the buffer.
        """
        log.debug('Going to the next highlight…')
        if not self.highlights or self.hl_pos != self.hl_pos or \
                self.hl_pos == len(self.highlights)-1:
            self.hl_pos = float('nan')
            self.pos = 0
            return
        hl_size = len(self.highlights) - 1
        if self.hl_pos < hl_size:
            self.hl_pos += 1
        else:
            self.hl_pos = hl_size
        log.debug("self.hl_pos = %s", self.hl_pos)
        hl = self.highlights[self.hl_pos]
        pos = None
        while not pos:
            try:
                pos = self.built_lines.index(hl)
            except ValueError:
                self.highlights = self.highlights[self.hl_pos+1:]
                if not self.highlights:
                    self.hl_pos = float('nan')
                    self.pos = 0
                    return
                hl = self.highlights[0]
        self.pos = len(self.built_lines) - pos - self.height
        if self.pos < 0 or self.pos >= len(self.built_lines):
            self.pos = 0

    def previous_highlight(self):
        """
        Go to the previous highlight in the buffer.
        (depending on which highlight was selected before)
        if the buffer is already positionned on the first, or if there are no
        highlights, scroll to the end of the buffer.
        """
        log.debug('Going to the previous highlight…')
        if not self.highlights or self.hl_pos <= 0:
            self.hl_pos = float('nan')
            self.pos = 0
            return
        if self.hl_pos != self.hl_pos:
            self.hl_pos = len(self.highlights) - 1
        elif self.hl_pos > 0:
            self.hl_pos -= 1
        log.debug("self.hl_pos = %s", self.hl_pos)
        hl = self.highlights[self.hl_pos]
        pos = None
        while not pos:
            try:
                pos = self.built_lines.index(hl)
            except ValueError:
                self.highlights = self.highlights[self.hl_pos+1:]
                if not self.highlights:
                    self.hl_pos = float('nan')
                    self.pos = 0
                    return
                hl = self.highlights[0]
        self.pos = len(self.built_lines) - pos - self.height
        if self.pos < 0 or self.pos >= len(self.built_lines):
            self.pos = 0

    def scroll_up(self, dist=14):
        pos = self.pos
        self.pos += dist
        if self.pos + self.height > len(self.built_lines):
            self.pos = len(self.built_lines) - self.height
            if self.pos < 0:
                self.pos = 0
        return self.pos != pos

    def scroll_down(self, dist=14):
        pos = self.pos
        self.pos -= dist
        if self.pos <= 0:
            self.pos = 0
        return self.pos != pos

    def scroll_to_separator(self):
        """
        Scroll until separator is centered. If no separator is
        present, scroll at the top of the window
        """
        if None in self.built_lines:
            self.pos = len(self.built_lines) - self.built_lines.index(None) - self.height + 1
            if self.pos < 0:
                self.pos = 0
        else:
            self.pos = len(self.built_lines) - self.height + 1
        # Chose a proper position (not too high)
        self.scroll_up(0)
        # Make “next highlight” work afterwards. This makes it easy to
        # review all the highlights since the separator was placed, in
        # the correct order.
        self.hl_pos = len(self.highlights) - self.nb_of_highlights_after_separator - 1
        log.debug("self.hl_pos = %s", self.hl_pos)

    def remove_line_separator(self):
        """
        Remove the line separator
        """
        log.debug('remove_line_separator')
        if None in self.built_lines:
            self.built_lines.remove(None)
            self.separator_after = None

    def add_line_separator(self, room=None):
        """
        add a line separator at the end of messages list
        room is a textbuffer that is needed to get the previous message
        (in case of resize)
        """
        if None not in self.built_lines:
            self.built_lines.append(None)
            self.nb_of_highlights_after_separator = 0
            log.debug("Reseting number of highlights after separator")
            if room and room.messages:
                self.separator_after = room.messages[-1]

    def build_new_message(self, message, history=None, clean=True, highlight=False, timestamp=False):
        """
        Take one message, build it and add it to the list
        Return the number of lines that are built for the given
        message.
        """
        lines = self.build_message(message, timestamp=timestamp)
        if self.lock:
            self.lock_buffer.extend(lines)
        else:
            self.built_lines.extend(lines)
        if not lines or not lines[0]:
            return 0
        if highlight:
            self.highlights.append(lines[0])
            self.nb_of_highlights_after_separator += 1
            log.debug("Number of highlights after separator is now %s",
                          self.nb_of_highlights_after_separator)
        if clean:
            while len(self.built_lines) > self.lines_nb_limit:
                self.built_lines.pop(0)
        return len(lines)

    def build_message(self, message, timestamp=False):
        """
        Build a list of lines from a message, without adding it
        to a list
        """
        if message is None:  # line separator
            return [None]
        txt = message.txt
        if not txt:
            return []
        if len(message.str_time) > 8:
            default_color = (FORMAT_CHAR + dump_tuple(get_theme().COLOR_LOG_MSG)
                    + '}')
        else:
            default_color = None
        ret = []
        nick = truncate_nick(message.nickname)
        offset = 0
        if nick:
            offset += poopt.wcswidth(nick) + 2 # + nick + '> ' length
        if message.revisions > 0:
            offset += ceil(log10(message.revisions + 1))
        if message.me:
            offset += 1 # '* ' before and ' ' after
        if timestamp:
            if message.str_time:
                offset += 1 + len(message.str_time)
            if get_theme().CHAR_TIME_LEFT and message.str_time:
                offset += 1
            if get_theme().CHAR_TIME_RIGHT and message.str_time:
                offset += 1
        lines = poopt.cut_text(txt, self.width-offset-1)
        prepend = ''
        attrs = []
        for line in lines:
            saved = Line(msg=message, start_pos=line[0], end_pos=line[1], prepend=prepend)
            attrs = parse_attrs(message.txt[line[0]:line[1]], attrs)
            if attrs:
                prepend = FORMAT_CHAR + FORMAT_CHAR.join(attrs)
            else:
                if default_color:
                    prepend = default_color
                else:
                    prepend = ''
            ret.append(saved)
        return ret

    def refresh(self):
        log.debug('Refresh: %s', self.__class__.__name__)
        if self.height <= 0:
            return
        if self.pos == 0:
            lines = self.built_lines[-self.height:]
        else:
            lines = self.built_lines[-self.height-self.pos:-self.pos]
        with_timestamps = config.get("show_timestamps", True)
        with g_lock:
            self._win.move(0, 0)
            self._win.erase()
            for y, line in enumerate(lines):
                if line:
                    msg = line.msg
                    if line.start_pos == 0:
                        if msg.nick_color:
                            color = msg.nick_color
                        elif msg.user:
                            color = msg.user.color
                        else:
                            color = None
                        if with_timestamps:
                            self.write_time(msg.str_time)
                        if msg.me:
                            self._win.attron(to_curses_attr(get_theme().COLOR_ME_MESSAGE))
                            self.addstr('* ')
                            self.write_nickname(msg.nickname, color, msg.highlight)
                            if msg.revisions:
                                self._win.attron(to_curses_attr(get_theme().COLOR_REVISIONS_MESSAGE))
                                self.addstr('%d' % msg.revisions)
                                self._win.attrset(0)
                            self.addstr(' ')
                        else:
                            self.write_nickname(msg.nickname, color, msg.highlight)
                            if msg.revisions:
                                self._win.attron(to_curses_attr(get_theme().COLOR_REVISIONS_MESSAGE))
                                self.addstr('%d' % msg.revisions)
                                self._win.attrset(0)
                            self.addstr('> ')
                if y != self.height-1:
                    self.addstr('\n')
            self._win.attrset(0)
            for y, line in enumerate(lines):
                if not line:
                    self.write_line_separator(y)
                else:
                    self.write_text(y,
                                    # Offset for the timestamp (if any) plus a space after it
                                    (0 if not with_timestamps else (len(line.msg.str_time) + (1 if line.msg.str_time else 0) )) +
                                    # Offset for the nickname (if any) plus a space and a > after it
                                    (0 if not line.msg.nickname else (poopt.wcswidth(truncate_nick(line.msg.nickname)) + (3 if line.msg.me else 2) + ceil(log10(line.msg.revisions + 1)))),
                            line.prepend+line.msg.txt[line.start_pos:line.end_pos])
                if y != self.height-1:
                    self.addstr('\n')
            self._win.attrset(0)
            self._refresh()

    def write_line_separator(self, y):
        char = get_theme().CHAR_NEW_TEXT_SEPARATOR
        self.addnstr(y, 0,
                char*((self.width//len(char) - 1)),
                self.width,
                to_curses_attr(get_theme().COLOR_NEW_TEXT_SEPARATOR))

    def write_text(self, y, x, txt):
        """
        write the text of a line.
        """
        self.addstr_colored(txt, y, x)

    def write_nickname(self, nickname, color, highlight=False):
        """
        Write the nickname, using the user's color
        and return the number of written characters
        """
        if not nickname:
            return
        if highlight:
            hl_color = get_theme().COLOR_HIGHLIGHT_NICK
            if hl_color == "reverse":
                self._win.attron(curses.A_REVERSE)
            else:
                color = hl_color
        if color:
            self._win.attron(to_curses_attr(color))
        self.addstr(truncate_nick(nickname))
        if color:
            self._win.attroff(to_curses_attr(color))
        if highlight and hl_color == "reverse":
            self._win.attroff(curses.A_REVERSE)

    def write_time(self, time):
        """
        Write the date on the yth line of the window
        """
        if time:
            self.addstr(time)
            self.addstr(' ')

    def resize(self, height, width, y, x, room=None):
        with g_lock:
            if hasattr(self, 'width'):
                old_width = self.width
            else:
                old_width = None
            self._resize(height, width, y, x)
            if room and self.width != old_width:
                self.rebuild_everything(room)

            # reposition the scrolling after resize
            # (see #2450)
            buf_size = len(self.built_lines)
            if buf_size - self.pos < self.height:
                self.pos = buf_size - self.height
                if self.pos < 0:
                    self.pos = 0


    def rebuild_everything(self, room):
        self.built_lines = []
        with_timestamps = config.get("show_timestamps", True)
        for message in room.messages:
            self.build_new_message(message, clean=False, timestamp=with_timestamps)
            if self.separator_after is message:
                self.build_new_message(None)
        while len(self.built_lines) > self.lines_nb_limit:
            self.built_lines.pop(0)

    def modify_message(self, old_id, message):
        """
        Find a message, and replace it with a new one
        (instead of rebuilding everything in order to correct a message)
        """
        with_timestamps = config.get("show_timestamps", True)
        for i in range(len(self.built_lines)-1, -1, -1):
            if self.built_lines[i] and self.built_lines[i].msg.identifier == old_id:
                index = i
                while index >= 0 and self.built_lines[index] and self.built_lines[index].msg.identifier == old_id:
                    self.built_lines.pop(index)
                    index -= 1
                index += 1
                lines = self.build_message(message, timestamp=with_timestamps)
                for line in lines:
                    self.built_lines.insert(index, line)
                    index += 1
                break

    def __del__(self):
        log.debug('** TextWin: deleting %s built lines', (len(self.built_lines)))
        del self.built_lines

class HelpText(Win):
    """
    A Window just displaying a read-only message.
    Usually used to replace an Input when the tab is in
    command mode.
    """
    def __init__(self, text=''):
        Win.__init__(self)
        self.txt = text

    def refresh(self, txt=None):
        log.debug('Refresh: %s', self.__class__.__name__)
        if txt:
            self.txt = txt
        with g_lock:
            self._win.erase()
            self.addstr(0, 0, self.txt[:self.width-1], to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def do_command(self, key, raw=False):
        return False

class YesNoInput(Win):
    """
    A Window just displaying a Yes/No input
    Used to ask a confirmation
    """
    def __init__(self, text=''):
        Win.__init__(self)
        self.key_func = {
                'y' : self.on_yes,
                'n' : self.on_no,
        }
        self.txt = text
        self.value = None

    def on_yes(self):
        self.value = True

    def on_no(self):
        self.value = False

    def refresh(self, txt=None):
        log.debug('Refresh: %s', self.__class__.__name__)
        if txt:
            self.txt = txt
        with g_lock:
            self._win.erase()
            self.addstr(0, 0, self.txt[:self.width-1], to_curses_attr(get_theme().COLOR_WARNING_PROMPT))
            self.finish_line(get_theme().COLOR_WARNING_PROMPT)
            self._refresh()

    def do_command(self, key, raw=False):
        if key.lower() in self.key_func:
            self.key_func[key]()

    def prompt(self):
        """Monopolizes the input while waiting for a recognized keypress"""
        cl = []
        while self.value is None:
            if len(cl) == 1 and cl[0] in self.key_func:
                self.key_func[cl[0]]()
            cl = self.core.read_keyboard()

class Input(Win):
    """
    The simplest Input possible, provides just a way to edit a single line
    of text. It also has a clipboard, common to all Inputs.
    Doesn't have any history.
    It doesn't do anything when enter is pressed either.
    This should be herited for all kinds of Inputs, for example MessageInput
    or the little inputs in dataforms, etc, adding specific features (completion etc)
    It features two kinds of completion, but they have to be called from outside (the Tab),
    passing the list of items that can be used to complete. The completion can be used
    in a very flexible way.
    """
    text_attributes = ['b', 'o', 'u', '1', '2', '3', '4', '5', '6', '7', 't']
    clipboard = '' # A common clipboard for all the inputs, this makes
    # it easy cut and paste text between various input
    def __init__(self):
        self.key_func = {
            "KEY_LEFT": self.key_left,
            "KEY_RIGHT": self.key_right,
            "KEY_END": self.key_end,
            "KEY_HOME": self.key_home,
            "KEY_DC": self.key_dc,
            '^D': self.key_dc,
            'M-b': self.jump_word_left,
            "M-[1;5D": self.jump_word_left,
            '^W': self.delete_word,
            'M-d': self.delete_next_word,
            '^K': self.delete_end_of_line,
            '^U': self.delete_begining_of_line,
            '^Y': self.paste_clipboard,
            '^A': self.key_home,
            '^E': self.key_end,
            'M-f': self.jump_word_right,
            "M-[1;5C": self.jump_word_right,
            "KEY_BACKSPACE": self.key_backspace,
            "M-KEY_BACKSPACE": self.delete_word,
            '^?': self.key_backspace,
            "M-^?": self.delete_word,
            # '^J': self.add_line_break,
            }
        Win.__init__(self)
        self.text = ''
        self.pos = 0       # The position of the “cursor” in the text
                           # (not only in the view)
        self.view_pos = 0  # The position (in the text) of the
                           # first character displayed on the
                           # screen
        self.on_input = None # callback called on any key pressed
        self.color = None    # use this color on addstr

    def on_delete(self):
        """
        Remove all references kept to a tab, so that the tab
        can be garbage collected
        """
        del self.key_func

    def set_color(self, color):
        self.color = color
        self.rewrite_text()

    def is_empty(self):
        if self.text:
            return False
        return True

    def is_cursor_at_end(self):
        """
        Whether or not the cursor is at the end of the text.
        """
        assert len(self.text) >= self.pos
        if len(self.text) == self.pos:
            return True
        return False

    def jump_word_left(self):
        """
        Move the cursor one word to the left
        """
        if self.pos == 0:
            return
        separators = string.punctuation+' '
        while self.pos > 0 and self.text[self.pos-1] in separators:
            self.key_left()
        while self.pos > 0 and self.text[self.pos-1] not in separators:
            self.key_left()
        return True

    def jump_word_right(self):
        """
        Move the cursor one word to the right
        """
        if self.is_cursor_at_end():
            return False
        separators = string.punctuation+' '
        while not self.is_cursor_at_end() and self.text[self.pos] in separators:
            self.key_right()
        while not self.is_cursor_at_end() and self.text[self.pos] not in separators:
            self.key_right()
        return True

    def delete_word(self):
        """
        Delete the word just before the cursor
        """
        separators = string.punctuation+' '
        while self.pos > 0 and self.text[self.pos-1] in separators:
            self.key_backspace()
        while self.pos > 0 and self.text[self.pos-1] not in separators:
            self.key_backspace()
        return True

    def delete_next_word(self):
        """
        Delete the word just after the cursor
        """
        separators = string.punctuation+' '
        while not self.is_cursor_at_end() and self.text[self.pos] in separators:
            self.key_dc()
        while not self.is_cursor_at_end() and self.text[self.pos] not in separators:
            self.key_dc()
        return True

    def delete_end_of_line(self):
        """
        Cut the text from cursor to the end of line
        """
        if self.is_cursor_at_end():
            return False
        Input.clipboard = self.text[self.pos:]
        self.text = self.text[:self.pos]
        self.key_end()
        return True

    def delete_begining_of_line(self):
        """
        Cut the text from cursor to the begining of line
        """
        if self.pos == 0:
            return
        Input.clipboard = self.text[:self.pos]
        self.text = self.text[self.pos:]
        self.key_home()
        return True

    def paste_clipboard(self):
        """
        Insert what is in the clipboard at the cursor position
        """
        if not Input.clipboard:
            return
        for letter in Input.clipboard:
            self.do_command(letter, False)
        self.rewrite_text()
        return True

    def key_dc(self):
        """
        delete char just after the cursor
        """
        self.reset_completion()
        if self.is_cursor_at_end():
            return              # end of line, nothing to delete
        self.text = self.text[:self.pos]+self.text[self.pos+1:]
        self.rewrite_text()
        return True

    def key_home(self):
        """
        Go to the begining of line
        """
        self.reset_completion()
        self.pos = 0
        self.rewrite_text()
        return True

    def key_end(self, reset=False):
        """
        Go to the end of line
        """
        if reset:
            self.reset_completion()
        self.pos = len(self.text)
        assert self.is_cursor_at_end()
        self.rewrite_text()
        return True

    def key_left(self, jump=True, reset=True):
        """
        Move the cursor one char to the left
        """
        if reset:
            self.reset_completion()
        if self.pos == 0:
            return
        self.pos -= 1
        if reset:
            self.rewrite_text()
        return True

    def key_right(self, jump=True, reset=True):
        """
        Move the cursor one char to the right
        """
        if reset:
            self.reset_completion()
        if self.is_cursor_at_end():
            return
        self.pos += 1
        if reset:
            self.rewrite_text()
        return True

    def key_backspace(self, reset=True):
        """
        Delete the char just before the cursor
        """
        self.reset_completion()
        if self.pos == 0:
            return
        self.key_left()
        self.key_dc()
        return True

    def auto_completion(self, word_list, add_after='', quotify=True):
        """
        Complete the input, from a list of words
        if add_after is None, we use the value defined in completion
        plus a space, after the completion. If it's a string, we use it after the
        completion (with no additional space)
        """
        if quotify:
            for i, word in enumerate(word_list[:]):
                word_list[i] = '"' + word + '"'
        self.normal_completion(word_list, add_after)
        return True

    def new_completion(self, word_list, argument_position=-1, add_after='', quotify=True, override=False):
        """
        Complete the argument at position ``argument_postion`` in the input.
        If ``quotify`` is ``True``, then the completion will operate on block of words
        (e.g. "toto titi") whereas if it is ``False``, it will operate on words (e.g
        "toto", "titi").

        The completions may modify other parts of the input when completing an argument,
        for example removing useless double quotes around single-words, or setting the
        space between each argument to only one space.

        The case where we complete the first argument is special, because we complete
        the command, and we do not want to modify anything else in the input.

        This method is the one that should be used if the command being completed
        has several arguments.
        """
        if argument_position == 0:
            self._new_completion_first(word_list)
        else:
            self._new_completion_args(word_list, argument_position, add_after, quotify, override)
        self.rewrite_text()
        return True

    def _new_completion_args(self, word_list, argument_position=-1, add_after='', quoted=True, override=False):
        """
        Case for completing arguments with position ≠ 0
        """
        if quoted:
            words = common.shell_split(self.text)
        else:
            words = self.text.split()
        if argument_position >= len(words):
            current = ''
        else:
            current = words[argument_position]

        if quoted:
            split_words = words[1:]
            words = [words[0]]
            for word in split_words:
                if ' ' in word or '\\' in word:
                    words.append('"' + word + '"')
                else:
                    words.append(word)
        current_l = current.lower()
        if self.last_completion is not None:
            self.hit_list.append(self.hit_list.pop(0))
        else:
            if override:
                hit_list = word_list
            else:
                hit_list = []
                for word in word_list:
                    if word.lower().startswith(current_l):
                        hit_list.append(word)
            if not hit_list:
                return
            self.hit_list = hit_list

        if argument_position >= len(words):
            if quoted and ' ' in self.hit_list[0]:
                words.append('"'+self.hit_list[0]+'"')
            else:
                words.append(self.hit_list[0])
        else:
            if quoted and ' ' in self.hit_list[0]:
                words[argument_position] = '"'+self.hit_list[0]+'"'
            else:
                words[argument_position] = self.hit_list[0]

        new_pos = -1
        for i, word in enumerate(words):
            if argument_position >= i:
                new_pos += len(word) + 1

        self.last_completion = self.hit_list[0]
        self.text = words[0] + ' ' + ' '.join(words[1:])
        self.pos = new_pos

    def _new_completion_first(self, word_list):
        """
        Special case of completing the command itself:
        we don’t want to change anything to the input doing that
        """
        space_pos = self.text.find(' ')
        if space_pos != -1:
            current, follow = self.text[:space_pos], self.text[space_pos:]
        else:
            current, follow = self.text, ''

        if self.last_completion:
            self.hit_list.append(self.hit_list.pop(0))
        else:
            hit_list = []
            for word in word_list:
                if word.lower().startswith(current):
                    hit_list.append(word)
            if not hit_list:
                return
            self.hit_list = hit_list

        self.last_completion = self.hit_list[0]
        self.text = self.hit_list[0] + follow
        self.pos = len(self.hit_list[0])

    def get_argument_position(self, quoted=True):
        """
        Get the argument number at the current position
        """
        command_stop = self.text.find(' ')
        if command_stop == -1 or self.pos <= command_stop:
            return 0
        text = self.text[command_stop+1:]
        pos = self.pos - len(self.text) + len(text) - 1
        val = common.find_argument(pos, text, quoted=quoted) + 1
        return val

    def reset_completion(self):
        """
        Reset the completion list (called on ALL keys except tab)
        """
        self.hit_list = []
        self.last_completion = None

    def normal_completion(self, word_list, after):
        """
        Normal completion
        """
        pos = self.pos
        if pos < len(self.text) and after.endswith(' ') and self.text[pos] == ' ':
            after = after[:-1]  # remove the last space if we are already on a space
        if not self.last_completion:
            space_before_cursor = self.text.rfind(' ', 0, pos)
            if space_before_cursor != -1:
                begin = self.text[space_before_cursor+1:pos]
            else:
                begin = self.text[:pos]
            hit_list = []       # list of matching hits
            for word in word_list:
                if word.lower().startswith(begin.lower()):
                    hit_list.append(word)
                elif word.startswith('"') and word.lower()[1:].startswith(begin.lower()):
                    hit_list.append(word)
            if len(hit_list) == 0:
                return
            self.hit_list = hit_list
            end = len(begin)
        else:
            begin = self.last_completion
            end = len(begin) + len(after)
            self.hit_list.append(self.hit_list.pop(0)) # rotate list

        self.text = self.text[:pos-end] + self.text[pos:]
        pos -= end
        hit = self.hit_list[0] # take the first hit
        self.text = self.text[:pos] + hit + after + self.text[pos:]
        for _ in range(end):
            try:
                self.key_left(reset=False)
            except:
                pass
        for _ in range(len(hit) + len(after)):
            self.key_right(reset=False)

        self.rewrite_text()
        self.last_completion = hit

    def do_command(self, key, reset=True, raw=False):
        if key in self.key_func:
            res = self.key_func[key]()
            if not raw and self.on_input:
                self.on_input(self.get_text())
            return res
        if not raw and (not key or len(key) > 1):
            return False   # ignore non-handled keyboard shortcuts
        if reset:
            self.reset_completion()
        # Insert the char at the cursor position
        self.text = self.text[:self.pos]+key+self.text[self.pos:]
        self.pos += len(key)
        if reset:
            self.rewrite_text()
        if self.on_input:
            self.on_input(self.get_text())

        return True

    def add_line_break(self):
        """
        Add a (real) \n to the line
        """
        self.do_command('\n')

    def get_text(self):
        """
        Return the text entered so far
        """
        return self.text

    def addstr_colored_lite(self, text, y=None, x=None):
        """
        Just like addstr_colored, with the single-char attributes
        (\x0E to \x19 instead of \x19 + attr). We do not use any }
        char in this version
        """
        if y is not None and x is not None:
            self.move(y, x)
        format_char = find_first_format_char(text)
        while format_char != -1:
            attr_char = self.text_attributes[format_chars.index(text[format_char])]
            self.addstr(text[:format_char])
            self.addstr(attr_char, curses.A_REVERSE)
            text = text[format_char+1:]
            if attr_char == 'o':
                self._win.attrset(0)
            elif attr_char == 'u':
                self._win.attron(curses.A_UNDERLINE)
            elif attr_char == 'b':
                self._win.attron(curses.A_BOLD)
            elif attr_char in string.digits and attr_char != '':
                self._win.attron(to_curses_attr((int(attr_char), -1)))
            format_char = find_first_format_char(text)
        self.addstr(text)

    def rewrite_text(self):
        """
        Refresh the line onscreen, but first, always adjust the
        view_pos.  Also, each FORMAT_CHAR+attr_char count only take
        one screen column (this is done in addstr_colored_lite), we
        have to do some special calculations to find the correct
        length of text to display, and the position of the cursor.
        """
        self.adjust_view_pos()
        with g_lock:
            text = self.text.replace('\n', '|')
            self._win.erase()
            if self.color:
                self._win.attron(to_curses_attr(self.color))
            displayed_text = text[self.view_pos:self.view_pos+self.width-1].replace('\t', '\x18')
            self._win.attrset(0)
            self.addstr_colored_lite(displayed_text)
            # Fill the rest of the line with the input color
            if self.color:
                (_, x) = self._win.getyx()
                size = self.width - x
                self.addnstr(' ' * size, size, to_curses_attr(self.color))
            self.addstr(0,
                    poopt.wcswidth(displayed_text[:self.pos-self.view_pos]), '')
            if self.color:
                self._win.attroff(to_curses_attr(self.color))
            curses.curs_set(1)
            self._refresh()

    def adjust_view_pos(self):
        """
        Adjust the position of the View, if needed (for example if the
        cursor moved and would now be out of the view, we adapt the
        view_pos so that we can always see our cursor)
        """
        # start of the input
        if self.pos == 0:
            self.view_pos = 0
            return
        # cursor outside of the screen (left)
        if self.pos < self.view_pos:
            self.view_pos = self.pos - max(1 * self.width // 3, 1)
        # cursor outside of the screen (right)
        elif self.pos >= self.view_pos + self.width - 1:
            self.view_pos = self.pos - max(2 * self.width // 3, 2)

        if self.view_pos < 0:
            self.view_pos = 0


        assert(self.pos > self.view_pos and
               self.pos < self.view_pos + max(self.width, 3))

    def refresh(self):
        log.debug('Refresh: %s', self.__class__.__name__)
        self.rewrite_text()

    def clear_text(self):
        self.text = ''
        self.pos = 0
        self.rewrite_text()

    def key_enter(self):
        txt = self.get_text()
        self.clear_text()
        return txt

class HistoryInput(Input):
    """
    An input with colors and stuff, plus an history
    ^R allows to search inside the history (as in a shell)
    """
    history = list()

    def __init__(self):
        Input.__init__(self)
        self.help_message = ''
        self.current_completed = ''
        self.key_func['^R'] = self.toggle_search
        self.search = False
        if config.get('separate_history', False):
            self.history = list()

    def toggle_search(self):
        if self.help_message:
            return
        self.search = not self.search
        self.refresh()

    def update_completed(self):
        """
        Find a match for the current text
        """
        if not self.text:
            return
        for i in self.history:
            if self.text in i:
                self.current_completed = i
                return
        self.current_completed = ''

    def history_enter(self):
        """
        Enter was pressed, set the text to the
        current completion and disable history
        search
        """
        if self.search:
            self.search = False
            if self.current_completed:
                self.text = self.current_completed
                self.current_completed = ''
            self.refresh()
            return True
        self.refresh()
        return False

    def key_up(self):
        """
        Get the previous line in the history
        """
        self.reset_completion()
        if self.histo_pos == -1 and self.get_text():
            if not self.history or self.history[0] != self.get_text():
                # add the message to history, we do not want to lose it
                self.history.insert(0, self.get_text())
                self.histo_pos += 1
        if self.histo_pos < len(self.history) - 1:
            self.histo_pos += 1
            self.text = self.history[self.histo_pos]
        self.key_end()

    def key_down(self):
        """
        Get the next line in the history
        """
        self.reset_completion()
        if self.histo_pos > 0:
            self.histo_pos -= 1
            self.text = self.history[self.histo_pos]
        elif self.histo_pos <= 0 and self.get_text():
            if not self.history or self.history[0] != self.get_text():
                # add the message to history, we do not want to lose it
                self.history.insert(0, self.get_text())
            self.text = ''
            self.histo_pos = -1
        self.key_end()

class MessageInput(HistoryInput):
    """
    The input featuring history and that is being used in
    Conversation, Muc and Private tabs
    Also letting the user enter colors or other text markups
    """
    history = list()            # The history is common to all MessageInput

    def __init__(self):
        HistoryInput.__init__(self)
        self.last_completion = None
        self.histo_pos = -1
        self.key_func["KEY_UP"] = self.key_up
        self.key_func["M-A"] = self.key_up
        self.key_func["KEY_DOWN"] = self.key_down
        self.key_func["M-B"] = self.key_down
        self.key_func['^C'] = self.enter_attrib

    def enter_attrib(self):
        """
        Read one more char (c), add the corresponding char from formats_char to the text string
        """
        attr_char = self.core.read_keyboard()[0]
        if attr_char in self.text_attributes:
            char = format_chars[self.text_attributes.index(attr_char)]
            self.do_command(char, False)
            self.rewrite_text()

    def key_enter(self):
        if self.history_enter():
            return

        txt = self.get_text()
        if len(txt) != 0:
            if not self.history or self.history[0] != txt:
                # add the message to history, but avoid duplicates
                self.history.insert(0, txt)
            self.histo_pos = -1
        self.clear_text()
        return txt

class CommandInput(HistoryInput):
    """
    An input with an help message in the left, with three given callbacks:
    one when when successfully 'execute' the command and when we abort it.
    The last callback is optional and is called on any input key
    This input is used, for example, in the RosterTab when, to replace the
    HelpMessage when a command is started
    The on_input callback
    """
    history = list()

    def __init__(self, help_message, on_abort, on_success, on_input=None):
        HistoryInput.__init__(self)
        self.on_abort = on_abort
        self.on_success = on_success
        self.on_input = on_input
        self.help_message = help_message
        self.key_func['^M'] = self.success
        self.key_func['^G'] = self.abort
        self.key_func['^C'] = self.abort
        self.key_func["KEY_UP"] = self.key_up
        self.key_func["M-A"] = self.key_up
        self.key_func["KEY_DOWN"] = self.key_down
        self.key_func["M-B"] = self.key_down
        self.histo_pos = -1

    def do_command(self, key, refresh=True, raw=False):
        res = Input.do_command(self, key, refresh, raw)
        if self.on_input:
            self.on_input(self.get_text())
        return res

    def disable_history(self):
        """
        Disable the history (up/down) keys
        """
        if 'KEY_UP' in self.key_func:
            del self.key_func['KEY_UP']
        if 'KEY_DOWN' in self.key_func:
            del self.key_func['KEY_DOWN']

    @property
    def history_disabled(self):
        return 'KEY_UP' not in self.key_func and 'KEY_DOWN' not in self.key_func

    def success(self):
        """
        call the success callback, passing the text as argument
        """
        self.on_input = None
        if self.search:
            self.history_enter()
        res = self.on_success(self.get_text())
        return res

    def abort(self):
        """
        Call the abort callback, passing the text as argument
        """
        self.on_input = None
        return self.on_abort(self.get_text())

    def on_delete(self):
        """
        SERIOUSLY BIG WTF.

        I can do
        self.key_func.clear()

        but not
        del self.key_func
        because that would raise an AttributeError exception. WTF.
        """
        self.on_abort = None
        self.on_success = None
        self.on_input = None
        self.key_func.clear()

    def key_enter(self):
        txt = self.get_text()
        if len(txt) != 0:
            if not self.history or self.history[0] != txt:
                # add the message to history, but avoid duplicates
                self.history.insert(0, txt)
            self.histo_pos = -1


class VerticalSeparator(Win):
    """
    Just a one-column window, with just a line in it, that is
    refreshed only on resize, but never on refresh, for efficiency
    """
    def __init__(self):
        Win.__init__(self)

    def rewrite_line(self):
        with g_lock:
            self._win.vline(0, 0, curses.ACS_VLINE, self.height, to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR))
            self._refresh()

    def refresh(self):
        log.debug('Refresh: %s', self.__class__.__name__)
        self.rewrite_line()

class RosterWin(Win):

    def __init__(self):
        Win.__init__(self)
        self.pos = 0            # cursor position in the contact list
        self.start_pos = 1      # position of the start of the display
        self.selected_row = None
        self.roster_cache = []

    @property
    def roster_len(self):
        return len(self.roster_cache)

    def move_cursor_down(self, number=1):
        """
        Return True if we scrolled, False otherwise
        """
        pos = self.pos
        if self.pos < self.roster_len-number:
            self.pos += number
        else:
            self.pos = self.roster_len - 1
        if self.pos >= self.start_pos-1 + self.height-1:
            if number == 1:
                self.scroll_down(8)
            else:
                self.scroll_down(self.pos-self.start_pos - self.height // 2)
        self.update_pos()
        return pos != self.pos

    def move_cursor_up(self, number=1):
        """
        Return True if we scrolled, False otherwise
        """
        pos = self.pos
        if self.pos-number >= 0:
            self.pos -= number
        else:
            self.pos = 0
        if self.pos <= self.start_pos:
            if number == 1:
                self.scroll_up(8)
            else:
                self.scroll_up(self.start_pos-self.pos + self.height // 2)
        self.update_pos()
        return pos != self.pos

    def update_pos(self):
        if len(self.roster_cache) > self.pos and self.pos >= 0:
            self.selected_row = self.roster_cache[self.pos]
        elif self.roster_cache:
            self.selected_row = self.roster_cache[-1]

    def scroll_down(self, number=8):
        pos = self.start_pos
        if self.start_pos + number <= self.roster_len-1:
            self.start_pos += number
        else:
            self.start_pos = self.roster_len-1
        return self.start_pos != pos

    def scroll_up(self, number=8):
        pos = self.start_pos
        if self.start_pos - number > 0:
            self.start_pos -= number
        else:
            self.start_pos = 1
        return self.start_pos != pos

    def build_roster_cache(self, roster):
        """
        Regenerates the roster cache if needed
        """
        with g_lock:
            if roster.needs_rebuild:
                log.debug('The roster has changed, rebuilding the cache…')
                # This is a search
                if roster.contact_filter:
                    self.roster_cache = []
                    sort = config.get('roster_sort', 'jid:show') or 'jid:show'
                    for contact in roster.get_contacts_sorted_filtered(sort):
                        self.roster_cache.append(contact)
                else:
                    show_offline = config.get('roster_show_offline', False) or roster.contact_filter
                    sort = config.get('roster_sort', 'jid:show') or 'jid:show'
                    group_sort = config.get('roster_group_sort', 'name') or 'name'
                    self.roster_cache = []
                    # build the cache
                    for group in roster.get_groups(group_sort):
                        contacts_filtered = group.get_contacts(roster.contact_filter)
                        if (not show_offline and group.get_nb_connected_contacts() == 0) or not contacts_filtered:
                            continue    # Ignore empty groups
                        self.roster_cache.append(group)
                        if group.folded:
                            continue # ignore folded groups
                        for contact in group.get_contacts(roster.contact_filter, sort):
                            if not show_offline and len(contact) == 0:
                                continue # ignore offline contacts
                            self.roster_cache.append(contact)
                            if not contact.folded(group.name):
                                for resource in contact.get_resources():
                                    self.roster_cache.append(resource)
                roster.last_built = datetime.now()
                if self.selected_row in self.roster_cache:
                    if self.pos < self.roster_len and self.roster_cache[self.pos] != self.selected_row:
                        self.pos = self.roster_cache.index(self.selected_row)

    def refresh(self, roster):
        """
        We display a number of lines from the roster cache
        (and rebuild it if needed)
        """
        log.debug('Refresh: %s', self.__class__.__name__)
        self.build_roster_cache(roster)
        with g_lock:
            # make sure we are within bounds
            self.move_cursor_up((self.roster_len + self.pos) if self.pos >= self.roster_len else 0)
            if not self.roster_cache:
                self.selected_row = None
            self._win.erase()
            self._win.move(0, 0)
            self.draw_roster_information(roster)
            y = 1
            group = "none"
            # scroll down if needed
            if self.start_pos+self.height <= self.pos+2:
                self.scroll_down(self.pos - self.start_pos - self.height + (self.height//2))
            # draw the roster from the cache
            roster_view = self.roster_cache[self.start_pos-1:self.start_pos+self.height]

            for item in roster_view:
                draw_selected = False
                if y -2 + self.start_pos == self.pos:
                    draw_selected = True
                    self.selected_row = item

                if isinstance(item, RosterGroup):
                    self.draw_group(y, item, draw_selected)
                    group = item.name
                elif isinstance(item, Contact):
                    self.draw_contact_line(y, item, draw_selected, group)
                elif isinstance(item, Resource):
                    self.draw_resource_line(y, item, draw_selected)

                y += 1

            if self.start_pos > 1:
                self.draw_plus(1)
            if self.start_pos + self.height-2 < self.roster_len:
                self.draw_plus(self.height-1)
            self._refresh()


    def draw_plus(self, y):
        """
        Draw the indicator that shows that
        the list is longer than what is displayed
        """
        self.addstr(y, self.width-5, '++++', to_curses_attr(get_theme().COLOR_MORE_INDICATOR))

    def draw_roster_information(self, roster):
        """
        The header at the top
        """
        self.addstr('Roster: %s/%s contacts' % (
                roster.get_nb_connected_contacts(),
                len(roster)),
            to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.finish_line(get_theme().COLOR_INFORMATION_BAR)

    def draw_group(self, y, group, colored):
        """
        Draw a groupname on a line
        """
        if colored:
            self._win.attron(to_curses_attr(get_theme().COLOR_SELECTED_ROW))
        if group.folded:
            self.addstr(y, 0, '[+] ')
        else:
            self.addstr(y, 0, '[-] ')
        contacts = " (%s/%s)" % (group.get_nb_connected_contacts(), len(group))
        self.addstr(y, 4, self.truncate_name(group.name, len(contacts)+4) + contacts)
        if colored:
            self._win.attroff(to_curses_attr(get_theme().COLOR_SELECTED_ROW))
        self.finish_line()

    def truncate_name(self, name, added):
        if len(name) + added <= self.width:
            return name
        return name[:self.width - added - 1] + '…'

    def draw_contact_line(self, y, contact, colored, group):
        """
        Draw on a line all informations about one contact.
        This is basically the highest priority resource's informations
        Use 'color' to draw the jid/display_name to show what is
        the currently selected contact in the list
        """

        theme = get_theme()
        resource = contact.get_highest_priority_resource()
        if not resource:
            # There's no online resource
            presence = 'unavailable'
            nb = ''
        else:
            presence = resource.presence
            nb = ' (%s)' % len(contact)
        color = theme.color_show(presence)
        added = 2 + len(theme.CHAR_STATUS) + len(nb)

        self.addstr(y, 0, ' ')
        self.addstr(theme.CHAR_STATUS, to_curses_attr(color))

        show_roster_sub = config.get('show_roster_subscriptions', '')

        self.addstr(' ')
        if resource:
            self.addstr('[+] ' if contact.folded(group) else '[-] ')
            added += 4
        if contact.ask:
            added += len(get_theme().CHAR_ROSTER_ASKED)
        if config.get('show_s2s_errors', True) and contact.error:
            added += len(get_theme().CHAR_ROSTER_ERROR)
        if contact.tune:
            added += len(get_theme().CHAR_ROSTER_TUNE)
        if contact.mood:
            added += len(get_theme().CHAR_ROSTER_MOOD)
        if contact.activity:
            added += len(get_theme().CHAR_ROSTER_ACTIVITY)
        if contact.gaming:
            added += len(get_theme().CHAR_ROSTER_GAMING)
        if show_roster_sub in ('all', 'incomplete', 'to', 'from', 'both', 'none'):
            added += len(theme.char_subscription(contact.subscription, keep=show_roster_sub))

        if not config.get('show_roster_jids', True) and contact.name:
            display_name = '%s' % contact.name
        elif contact.name and contact.name != contact.bare_jid:
            display_name = '%s (%s)' % (contact.name, contact.bare_jid)
        else:
            display_name = '%s' % (contact.bare_jid,)

        display_name = self.truncate_name(display_name, added) + nb

        if colored:
            self.addstr(display_name, to_curses_attr(get_theme().COLOR_SELECTED_ROW))
        else:
            self.addstr(display_name)

        if show_roster_sub in ('all', 'incomplete', 'to', 'from', 'both', 'none'):
            self.addstr(theme.char_subscription(contact.subscription, keep=show_roster_sub), to_curses_attr(theme.COLOR_ROSTER_SUBSCRIPTION))
        if contact.ask:
            self.addstr(get_theme().CHAR_ROSTER_ASKED, to_curses_attr(get_theme().COLOR_IMPORTANT_TEXT))
        if config.get('show_s2s_errors', True) and contact.error:
            self.addstr(get_theme().CHAR_ROSTER_ERROR, to_curses_attr(get_theme().COLOR_ROSTER_ERROR))
        if contact.tune:
            self.addstr(get_theme().CHAR_ROSTER_TUNE, to_curses_attr(get_theme().COLOR_ROSTER_TUNE))
        if contact.activity:
            self.addstr(get_theme().CHAR_ROSTER_ACTIVITY, to_curses_attr(get_theme().COLOR_ROSTER_ACTIVITY))
        if contact.mood:
            self.addstr(get_theme().CHAR_ROSTER_MOOD, to_curses_attr(get_theme().COLOR_ROSTER_MOOD))
        if contact.gaming:
            self.addstr(get_theme().CHAR_ROSTER_GAMING, to_curses_attr(get_theme().COLOR_ROSTER_GAMING))
        self.finish_line()

    def draw_resource_line(self, y, resource, colored):
        """
        Draw a specific resource line
        """
        color = get_theme().color_show(resource.presence)
        self.addstr(y, 4, get_theme().CHAR_STATUS, to_curses_attr(color))
        if colored:
            self.addstr(y, 6, self.truncate_name(str(resource.jid), 6), to_curses_attr(get_theme().COLOR_SELECTED_ROW))
        else:
            self.addstr(y, 6, self.truncate_name(str(resource.jid), 6))
        self.finish_line()

    def get_selected_row(self):
        if self.pos >= len(self.roster_cache):
            return self.selected_row
        if len(self.roster_cache) > 0:
            self.selected_row = self.roster_cache[self.pos]
            return self.roster_cache[self.pos]
        return None

class ContactInfoWin(Win):
    def __init__(self):
        Win.__init__(self)

    def draw_contact_info(self, contact):
        """
        draw the contact information
        """
        resource = contact.get_highest_priority_resource()
        if contact:
            jid = contact.bare_jid
        elif resource:
            jid = resource.jid
        else:
            jid = 'example@example.com' # should never happen
        if resource:
            presence = resource.presence
        else:
            presence = 'unavailable'
        i = 0
        self.addstr(0, 0, '%s (%s)'%(jid, presence,), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.finish_line(get_theme().COLOR_INFORMATION_BAR)
        i += 1
        self.addstr(i, 0, 'Subscription: %s' % (contact.subscription,))
        self.finish_line()
        i += 1
        if contact.ask:
            if contact.ask == 'asked':
                self.addstr(i, 0, 'Ask: %s' % (contact.ask,), to_curses_attr(get_theme().COLOR_IMPORTANT_TEXT))
            else:
                self.addstr(i, 0, 'Ask: %s' % (contact.ask,))
            self.finish_line()
            i += 1
        if resource:
            self.addstr(i, 0, 'Status: %s' % (resource.status))
            self.finish_line()
            i += 1

        if contact.error:
            self.addstr(i, 0, 'Error: %s' % contact.error, to_curses_attr(get_theme().COLOR_ROSTER_ERROR))
            self.finish_line()
            i += 1

        if contact.tune:
            self.addstr(i, 0, 'Tune: %s' % common.format_tune_string(contact.tune), to_curses_attr(get_theme().COLOR_NORMAL_TEXT))
            self.finish_line()
            i += 1

        if contact.mood:
            self.addstr(i, 0, 'Mood: %s' % contact.mood, to_curses_attr(get_theme().COLOR_NORMAL_TEXT))
            self.finish_line()
            i += 1

        if contact.activity:
            self.addstr(i, 0, 'Activity: %s' % contact.activity, to_curses_attr(get_theme().COLOR_NORMAL_TEXT))
            self.finish_line()
            i += 1

        if contact.gaming:
            self.addstr(i, 0, 'Game: %s' % common.format_gaming_string(contact.gaming), to_curses_attr(get_theme().COLOR_NORMAL_TEXT))
            self.finish_line()
            i += 1

    def draw_group_info(self, group):
        """
        draw the group information
        """
        self.addstr(0, 0, group.name, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.finish_line(get_theme().COLOR_INFORMATION_BAR)

    def refresh(self, selected_row):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            if isinstance(selected_row, RosterGroup):
                self.draw_group_info(selected_row)
            elif isinstance(selected_row, Contact):
                self.draw_contact_info(selected_row)
            # elif isinstance(selected_row, Resource):
            #     self.draw_contact_info(None, selected_row)
            self._refresh()

class ListWin(Win):
    """
    A list (with no depth, so not for the roster) that can be
    scrolled up and down, with one selected line at a time
    """
    def __init__(self, columns, with_headers=True):
        Win.__init__(self)
        self._columns = columns # a dict {'column_name': tuple_index}
        self._columns_sizes = {} # a dict {'column_name': size}
        self.sorted_by = (None, None) # for example: ('name', '↑')
        self.lines = []         # a list of dicts
        self._selected_row = 0
        self._starting_pos = 0  # The column number from which we start the refresh

    @property
    def pos(self):
        if len(self.lines) > self.height:
            return len(self.lines)
        else:
            return 0

    def empty(self):
        """
        emtpy the list and reset some important values as well
        """
        self.lines = []
        self._selected_row = 0
        self._starting_pos = 0

    def resize_columns(self, dic):
        """
        Resize the width of the columns
        """
        self._columns_sizes = dic

    def sort_by_column(self, col_name, asc=True):
        """
        Sort the list by the given column, ascendant or descendant
        """
        if not col_name:
            return
        elif asc:
            self.lines.sort(key=lambda x: x[self._columns[col_name]])
        else:
            self.lines.sort(key=lambda x: x[self._columns[col_name]],
                            reverse=True)
        self.refresh()
        curses.doupdate()

    def add_lines(self, lines):
        """
        Append some lines at the end of the list
        """
        if not lines:
            return
        self.lines.extend(lines)

    def set_lines(self, lines):
        """
        Set the lines to another list
        """
        if not lines:
            return
        self.lines = lines

    def get_selected_row(self):
        """
        Return the tuple representing the selected row
        """
        if self._selected_row is not None and self.lines:
            return self.lines[self._selected_row]
        return None

    def refresh(self):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            lines = self.lines[self._starting_pos:self._starting_pos+self.height]
            for y, line in enumerate(lines):
                x = 0
                for col in self._columns.items():
                    try:
                        txt = line[col[1]] or ''
                    except KeyError:
                        txt = ''
                    size = self._columns_sizes[col[0]]
                    txt += ' ' * (size-len(txt))
                    if not txt:
                        continue
                    if line is self.lines[self._selected_row]:
                        self.addstr(y, x, txt[:size], to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
                    else:
                        self.addstr(y, x, txt[:size])
                    x += size
            self._refresh()

    def move_cursor_down(self):
        """
        Move the cursor Down
        """
        if not self.lines:
            return
        if self._selected_row < len(self.lines) - 1:
            self._selected_row += 1
        while self._selected_row >= self._starting_pos + self.height:
            self._starting_pos += self.height // 2
        if self._starting_pos < 0:
            self._starting_pos = 0
        return True

    def move_cursor_up(self):
        """
        Move the cursor Up
        """
        if not self.lines:
            return
        if self._selected_row > 0:
            self._selected_row -= 1
        while self._selected_row < self._starting_pos:
            self._starting_pos -= self.height // 2
        return True

    def scroll_down(self):
        if not self.lines:
            return
        self._selected_row += self.height
        if self._selected_row > len(self.lines) - 1:
            self._selected_row = len(self.lines) -1
        while self._selected_row >= self._starting_pos + self.height:
            self._starting_pos += self.height // 2
        if self._starting_pos < 0:
            self._starting_pos = 0
        return True

    def scroll_up(self):
        if not self.lines:
            return
        self._selected_row -= self.height + 1
        if self._selected_row < 0:
            self._selected_row = 0
        while self._selected_row < self._starting_pos:
            self._starting_pos -= self.height // 2
        return True

class ColumnHeaderWin(Win):
    """
    A class displaying the column's names
    """
    def __init__(self, columns):
        Win.__init__(self)
        self._columns = columns
        self._columns_sizes = {}
        self._column_sel = ''
        self._column_order = ''
        self._column_order_asc = False

    def resize_columns(self, dic):
        self._columns_sizes = dic

    def get_columns(self):
        return self._columns

    def refresh(self):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            x = 0
            for col in self._columns:
                txt = col
                if col in self._column_order:
                    if self._column_order_asc:
                        txt += get_theme().CHAR_COLUMN_ASC
                    else:
                        txt += get_theme().CHAR_COLUMN_DESC
                #⇓⇑↑↓⇧⇩▲▼
                size = self._columns_sizes[col]
                txt += ' ' * (size-len(txt))
                if col in self._column_sel:
                    self.addstr(0, x, txt, to_curses_attr(get_theme().COLOR_COLUMN_HEADER_SEL))
                else:
                    self.addstr(0, x, txt, to_curses_attr(get_theme().COLOR_COLUMN_HEADER))
                x += size
            self._refresh()

    def sel_column(self, dic):
        self._column_sel = dic

    def get_sel_column(self):
        return self._column_sel

    def set_order(self, order):
        self._column_order = self._column_sel
        self._column_order_asc = order

    def get_order(self):
        if self._column_sel == self._column_order:
            return self._column_order_asc
        else:
            return False

    def sel_column_left(self):
        if self._column_sel in self._columns:
            index = self._columns.index(self._column_sel)
            if index > 1:
                index = index -1
            else:
                index = 0
        else:
            index = 0
        self._column_sel = self._columns[index]
        self.refresh()

    def sel_column_right(self):
        if self._column_sel in self._columns:
            index = self._columns.index(self._column_sel)
            if index < len(self._columns)-2:
                index = index +1
            else:
                index = len(self._columns) -1
        else:
            index = len(self._columns) - 1
        self._column_sel = self._columns[index]
        self.refresh()


class SimpleTextWin(Win):
    def __init__(self, text):
        Win.__init__(self)
        self._text = text
        self.built_lines = []

    def rebuild_text(self):
        """
        Transform the text in lines than can then be
        displayed without any calculation or anything
        at refresh() time
        It is basically called on each resize
        """
        self.built_lines = []
        for line in self._text.split('\n'):
            while len(line) >= self.width:
                limit = line[:self.width].rfind(' ')
                if limit <= 0:
                    limit = self.width
                self.built_lines.append(line[:limit])
                line = line[limit:]
            self.built_lines.append(line)

    def refresh(self):
        log.debug('Refresh: %s', self.__class__.__name__)
        with g_lock:
            self._win.erase()
            for y, line in enumerate(self.built_lines):
                self.addstr_colored(line, y, 0)
            self._refresh()