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# 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 TextBuffer class
"""
import logging
log = logging.getLogger(__name__)
import collections
from datetime import datetime
from config import config
from theming import get_theme
message_fields = 'txt nick_color time str_time nickname user identifier highlight me old_message revisions'
Message = collections.namedtuple('Message', message_fields)
class CorrectionError(Exception): pass
def other_elems(self):
acc = ['Message(']
fields = message_fields.split()
fields.remove('old_message')
for field in fields:
acc.append('%s=%s' % (field, getattr(self, field)))
return (', '.join(acc) + ', old_message=')
def repr_message(self):
init = other_elems(self)
acc = [init]
next = self.old_message
rev = 1
while next:
acc.append(other_elems(next))
next = next.old_message
rev += 1
acc.append('None')
while rev:
acc.append(')')
rev -= 1
return ''.join(acc)
Message.__repr__ = repr_message
Message.__str__ = repr_message
class TextBuffer(object):
"""
This class just keep trace of messages, in a list with various
informations and attributes.
"""
def __init__(self, messages_nb_limit=config.get('max_messages_in_memory', 2048)):
self.messages_nb_limit = messages_nb_limit
self.messages = [] # Message objects
self.windows = [] # we keep track of one or more windows
# so we can pass the new messages to them, as they are added, so
# they (the windows) can build the lines from the new message
def add_window(self, win):
self.windows.append(win)
@property
def last_message(self):
return self.messages[-1] if self.messages else None
def make_message(self, txt, time, nickname, nick_color, history, user, identifier, str_time=None, highlight=False, old_message=None, revisions=0):
time = time or datetime.now()
me = False
if txt.startswith('/me '):
me = True
txt = '\x19%(info_col)s}' % {'info_col': get_theme().COLOR_ME_MESSAGE[0]} + txt[4:]
msg = Message(
txt='%s\x19o'%(txt.replace('\t', ' '),),
nick_color=nick_color,
time=time,
str_time=(time.strftime("%Y-%m-%d %H:%M:%S") if history else time.strftime("%H:%M:%S")) if str_time is None else '',
nickname=nickname,
user=user,
identifier=identifier,
highlight=highlight,
me=me,
old_message=old_message,
revisions=revisions)
log.debug('Set message %s with %s.', identifier, msg)
return msg
def add_message(self, txt, time=None, nickname=None, nick_color=None, history=None, user=None, highlight=False, identifier=None, str_time=None):
msg = self.make_message(txt, time, nickname, nick_color, history, user, identifier, str_time=str_time, highlight=highlight)
self.messages.append(msg)
while len(self.messages) > self.messages_nb_limit:
self.messages.pop(0)
ret_val = None
for window in self.windows: # make the associated windows
# build the lines from the new message
nb = window.build_new_message(msg, history=history, highlight=highlight, timestamp=config.get("show_timestamps", "true") != 'false')
if ret_val is None:
ret_val = nb
if window.pos != 0:
window.scroll_up(nb)
return ret_val or 1
def modify_message(self, txt, old_id, new_id, highlight=False, time=None, user=None):
for i in range(len(self.messages) -1, -1, -1):
msg = self.messages[i]
if msg.identifier == old_id:
if msg.user and msg.user is not user:
raise CorrectionError("Different users")
elif len(msg.str_time) > 8: # ugly
raise CorrectionError("Delayed message")
message = self.make_message(txt, time if time else msg.time, msg.nickname, msg.nick_color, None, msg.user, new_id, highlight=highlight, old_message=msg, revisions=msg.revisions + 1)
self.messages[i] = message
log.debug('Replacing message %s with %s.', old_id, new_id)
return message
log.debug('Message %s not found in text_buffer, abort replacement.', old_id)
raise CorrectionError("nothing to replace")
def del_window(self, win):
self.windows.remove(win)
def __del__(self):
log.debug('** Deleting %s messages from textbuffer', len(self.messages))
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