conversation_textview.py

##	conversation_textview.py
##
## Copyright (C) 2005-2006 Yann Leboulanger <asterix@lagaule.org>
## Copyright (C) 2005-2006 Nikos Kouremenos <kourem@gmail.com>
## Copyright (C) 2005-2006 Travis Shirk <travis@pobox.com>
##
## This file is part of Gajim.
##
## Gajim is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 3 only.
##
## Gajim is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Gajim.  If not, see <http://www.gnu.org/licenses/>.
##

import random
from tempfile import gettempdir
from subprocess import Popen
from threading import Timer # for smooth scrolling

import gtk
import pango
import gobject
import time
import os
import tooltips
import dialogs
import locale
import Queue

import gtkgui_helpers
from common import gajim
from common import helpers
from calendar import timegm
from common.fuzzyclock import FuzzyClock

from htmltextview import HtmlTextView
from common.exceptions import GajimGeneralException

NOT_SHOWN = 0
ALREADY_RECEIVED = 1
SHOWN = 2

def is_selection_modified(mark):
	name = mark.get_name()
	if name and name in ('selection_bound', 'insert'):
		return True
	else:
		return False

def has_focus(widget):
	return widget.flags() & gtk.HAS_FOCUS == gtk.HAS_FOCUS

class TextViewImage(gtk.Image):

	def __init__(self, anchor):
		super(TextViewImage, self).__init__()
		self.anchor = anchor
		self._selected = False
		self._disconnect_funcs = []
		self.connect('parent-set', self.on_parent_set)
		self.connect('expose-event', self.on_expose)

	def _get_selected(self):
		parent = self.get_parent()
		if not parent or not self.anchor: return False
		buffer = parent.get_buffer()
		position = buffer.get_iter_at_child_anchor(self.anchor)
		bounds = buffer.get_selection_bounds()
		if bounds and position.in_range(*bounds):
			return True
		else:
			return False

	def get_state(self):
		parent = self.get_parent()
		if not parent:
			return gtk.STATE_NORMAL
		if self._selected:
			if has_focus(parent):
				return gtk.STATE_SELECTED
			else:
				return gtk.STATE_ACTIVE
		else:
			return gtk.STATE_NORMAL

	def _update_selected(self):
		selected = self._get_selected()
		if self._selected != selected:
			self._selected = selected
			self.queue_draw()

	def _do_connect(self, widget, signal, callback):
		id = widget.connect(signal, callback)
		def disconnect():
			widget.disconnect(id)
		self._disconnect_funcs.append(disconnect)

	def _disconnect_signals(self):
		for func in self._disconnect_funcs:
			func()
		self._disconnect_funcs = []

	def on_parent_set(self, widget, old_parent):
		parent = self.get_parent()
		if not parent:
			self._disconnect_signals()
			return

		self._do_connect(parent, 'style-set', self.do_queue_draw)
		self._do_connect(parent, 'focus-in-event', self.do_queue_draw)
		self._do_connect(parent, 'focus-out-event', self.do_queue_draw)

		textbuf = parent.get_buffer()
		self._do_connect(textbuf, 'mark-set', self.on_mark_set)
		self._do_connect(textbuf, 'mark-deleted', self.on_mark_deleted)

	def do_queue_draw(self, *args):
		self.queue_draw()
		return False

	def on_mark_set(self, buf, iterat, mark):
		self.on_mark_modified(mark)
		return False

	def on_mark_deleted(self, buf, mark):
		self.on_mark_modified(mark)
		return False

	def on_mark_modified(self, mark):
		if is_selection_modified(mark):
			self._update_selected()

	def on_expose(self, widget, event):
		state = self.get_state()
		if state != gtk.STATE_NORMAL:
			gc = widget.get_style().base_gc[state]
			area = widget.allocation
			widget.window.draw_rectangle(gc, True, area.x, area.y,
				area.width, area.height)
		return False


class ConversationTextview:
	'''Class for the conversation textview (where user reads already said messages)
	for chat/groupchat windows'''

	FOCUS_OUT_LINE_PIXBUF = gtk.gdk.pixbuf_new_from_file(os.path.join(
		gajim.DATA_DIR, 'pixmaps', 'muc_separator.png'))
	XEP0184_WARNING_PIXBUF = gtk.gdk.pixbuf_new_from_file(os.path.join(
		gajim.DATA_DIR, 'pixmaps', 'receipt_missing.png'))

	# smooth scroll constants
	MAX_SCROLL_TIME = 0.4 # seconds
	SCROLL_DELAY = 33 # milliseconds

	def __init__(self, account, used_in_history_window = False):
		'''if used_in_history_window is True, then we do not show
		Clear menuitem in context menu'''
		self.used_in_history_window = used_in_history_window

		# no need to inherit TextView, use it as atrribute is safer
		self.tv = HtmlTextView()
		self.tv.html_hyperlink_handler = self.html_hyperlink_handler

		# set properties
		self.tv.set_border_width(1)
		self.tv.set_accepts_tab(True)
		self.tv.set_editable(False)
		self.tv.set_cursor_visible(False)
		self.tv.set_wrap_mode(gtk.WRAP_WORD_CHAR)
		self.tv.set_left_margin(2)
		self.tv.set_right_margin(2)
		self.handlers = {}
		self.images = []
		self.image_cache = {}
		self.xep0184_marks = {}
		self.xep0184_shown = {}

		# It's True when we scroll in the code, so we can detect scroll from user
		self.auto_scrolling = False

		# connect signals
		id = self.tv.connect('motion_notify_event',
			self.on_textview_motion_notify_event)
		self.handlers[id] = self.tv
		id = self.tv.connect('populate_popup', self.on_textview_populate_popup)
		self.handlers[id] = self.tv
		id = self.tv.connect('button_press_event',
			self.on_textview_button_press_event)
		self.handlers[id] = self.tv

		id = self.tv.connect('expose-event',
			self.on_textview_expose_event)
		self.handlers[id] = self.tv


		self.account = account
		self.change_cursor = None
		self.last_time_printout = 0

		font = pango.FontDescription(gajim.config.get('conversation_font'))
		self.tv.modify_font(font)
		buffer = self.tv.get_buffer()
		end_iter = buffer.get_end_iter()
		buffer.create_mark('end', end_iter, False)

		self.tagIn = buffer.create_tag('incoming')
		color = gajim.config.get('inmsgcolor')
		self.tagIn.set_property('foreground', color)
		self.tagOut = buffer.create_tag('outgoing')
		color = gajim.config.get('outmsgcolor')
		self.tagOut.set_property('foreground', color)
		self.tagStatus = buffer.create_tag('status')
		color = gajim.config.get('statusmsgcolor')
		self.tagStatus.set_property('foreground', color)

		colors = gajim.config.get('gc_nicknames_colors')
		colors = colors.split(':')
		for i,color in enumerate(colors):
			tagname = 'gc_nickname_color_' + str(i)
			tag = buffer.create_tag(tagname)
			tag.set_property('foreground', color)

		tag = buffer.create_tag('marked')
		color = gajim.config.get('markedmsgcolor')
		tag.set_property('foreground', color)
		tag.set_property('weight', pango.WEIGHT_BOLD)

		tag = buffer.create_tag('time_sometimes')
		tag.set_property('foreground', 'darkgrey')
		tag.set_property('scale', pango.SCALE_SMALL)
		tag.set_property('justification', gtk.JUSTIFY_CENTER)

		tag = buffer.create_tag('small')
		tag.set_property('scale', pango.SCALE_SMALL)

		tag = buffer.create_tag('restored_message')
		color = gajim.config.get('restored_messages_color')
		tag.set_property('foreground', color)

		self.tagURL = buffer.create_tag('url')
		color = gajim.config.get('urlmsgcolor')
		self.tagURL.set_property('foreground', color)
		self.tagURL.set_property('underline', pango.UNDERLINE_SINGLE)
		id = self.tagURL.connect('event', self.hyperlink_handler, 'url')
		self.handlers[id] = self.tagURL

		self.tagMail = buffer.create_tag('mail')
		self.tagMail.set_property('foreground', color)
		self.tagMail.set_property('underline', pango.UNDERLINE_SINGLE)
		id = self.tagMail.connect('event', self.hyperlink_handler, 'mail')
		self.handlers[id] = self.tagMail

		tag = buffer.create_tag('bold')
		tag.set_property('weight', pango.WEIGHT_BOLD)

		tag = buffer.create_tag('italic')
		tag.set_property('style', pango.STYLE_ITALIC)

		tag = buffer.create_tag('underline')
		tag.set_property('underline', pango.UNDERLINE_SINGLE)

		buffer.create_tag('focus-out-line', justification = gtk.JUSTIFY_CENTER)

		tag = buffer.create_tag('xep0184-warning')

		# One mark at the begining then 2 marks between each lines
		size = gajim.config.get('max_conversation_lines')
		size = 2 * size - 1
		self.marks_queue = Queue.Queue(size)

		self.allow_focus_out_line = True
		# holds a mark at the end of --- line
		self.focus_out_end_mark = None

		self.xep0184_warning_tooltip = tooltips.BaseTooltip()

		self.line_tooltip = tooltips.BaseTooltip()
		# use it for hr too
		self.tv.focus_out_line_pixbuf = ConversationTextview.FOCUS_OUT_LINE_PIXBUF
		self.smooth_id = None

	def del_handlers(self):
		for i in self.handlers.keys():
			if self.handlers[i].handler_is_connected(i):
				self.handlers[i].disconnect(i)
		del self.handlers
		self.tv.destroy()
		#FIXME:
		# self.line_tooltip.destroy()

	def update_tags(self):
		self.tagIn.set_property('foreground', gajim.config.get('inmsgcolor'))
		self.tagOut.set_property('foreground', gajim.config.get('outmsgcolor'))
		self.tagStatus.set_property('foreground',
			gajim.config.get('statusmsgcolor'))
		self.tagURL.set_property('foreground', gajim.config.get('urlmsgcolor'))
		self.tagMail.set_property('foreground', gajim.config.get('urlmsgcolor'))

	def at_the_end(self):
		buffer = self.tv.get_buffer()
		end_iter = buffer.get_end_iter()
		end_rect = self.tv.get_iter_location(end_iter)
		visible_rect = self.tv.get_visible_rect()
		if end_rect.y <= (visible_rect.y + visible_rect.height):
			return True
		return False

	# Smooth scrolling inspired by Pidgin code
	def smooth_scroll(self):
		parent = self.tv.get_parent()
		if not parent:
			return False
		vadj = parent.get_vadjustment()
		max_val = vadj.upper - vadj.page_size + 1
		cur_val = vadj.get_value()
		# scroll by 1/3rd of remaining distance
		onethird = cur_val + ((max_val - cur_val) / 3.0)
		self.auto_scrolling = True
		vadj.set_value(onethird)
		self.auto_scrolling = False
		if max_val - onethird < 0.01:
			self.smooth_id = None
			self.smooth_scroll_timer.cancel()
			return False
		return True

	def smooth_scroll_timeout(self):
		gobject.idle_add(self.do_smooth_scroll_timeout)
		return

	def do_smooth_scroll_timeout(self):
		if not self.smooth_id:
			# we finished scrolling
			return
		gobject.source_remove(self.smooth_id)
		self.smooth_id = None
		parent = self.tv.get_parent()
		if parent:
			vadj = parent.get_vadjustment()
			self.auto_scrolling = True
			vadj.set_value(vadj.upper - vadj.page_size + 1)
			self.auto_scrolling = False

	def smooth_scroll_to_end(self):
		if None != self.smooth_id: # already scrolling
			return False
		self.smooth_id = gobject.timeout_add(self.SCROLL_DELAY,
			self.smooth_scroll)
		self.smooth_scroll_timer = Timer(self.MAX_SCROLL_TIME,
			self.smooth_scroll_timeout)
		self.smooth_scroll_timer.start()
		return False

	def scroll_to_end(self):
		parent = self.tv.get_parent()
		buffer = self.tv.get_buffer()
		end_mark = buffer.get_mark('end')
		if not end_mark:
			return False
		self.auto_scrolling = True
		self.tv.scroll_to_mark(end_mark, 0, True, 0, 1)
		adjustment = parent.get_hadjustment()
		adjustment.set_value(0)
		self.auto_scrolling = False
		return False # when called in an idle_add, just do it once

	def bring_scroll_to_end(self, diff_y = 0,
	use_smooth=gajim.config.get('use_smooth_scrolling')):
		''' scrolls to the end of textview if end is not visible '''
		buffer = self.tv.get_buffer()
		end_iter = buffer.get_end_iter()
		end_rect = self.tv.get_iter_location(end_iter)
		visible_rect = self.tv.get_visible_rect()
		# scroll only if expected end is not visible
		if end_rect.y >= (visible_rect.y + visible_rect.height + diff_y):
			if use_smooth:
				gobject.idle_add(self.smooth_scroll_to_end)
			else:
				gobject.idle_add(self.scroll_to_end_iter)

	def scroll_to_end_iter(self):
		buffer = self.tv.get_buffer()
		end_iter = buffer.get_end_iter()
		if not end_iter:
			return False
		self.tv.scroll_to_iter(end_iter, 0, False, 1, 1)
		return False # when called in an idle_add, just do it once

	def stop_scrolling(self):
		if self.smooth_id:
			gobject.source_remove(self.smooth_id)
			self.smooth_id = None
			self.smooth_scroll_timer.cancel()

	def show_xep0184_warning(self, id):
		if self.xep0184_marks.has_key(id):
			return

		buffer = self.tv.get_buffer()
		buffer.begin_user_action()

		self.xep0184_marks[id] = buffer.create_mark(None,
			buffer.get_end_iter(), left_gravity=True)
		self.xep0184_shown[id] = NOT_SHOWN

		def show_it():
			if self.xep0184_shown[id] == ALREADY_RECEIVED:
				return False

			end_iter = buffer.get_iter_at_mark(
				self.xep0184_marks[id])
			buffer.insert(end_iter, ' ')
			buffer.insert_pixbuf(end_iter,
				ConversationTextview.XEP0184_WARNING_PIXBUF)
			before_img_iter = buffer.get_iter_at_mark(
				self.xep0184_marks[id])
			before_img_iter.forward_char()
			post_img_iter = before_img_iter.copy()
			post_img_iter.forward_char()
			buffer.apply_tag_by_name('xep0184-warning', before_img_iter,
				post_img_iter)

			self.xep0184_shown[id] = SHOWN
			return False
		gobject.timeout_add_seconds(2, show_it)

		buffer.end_user_action()

	def hide_xep0184_warning(self, id):
		if not self.xep0184_marks.has_key(id):
			return

		if self.xep0184_shown[id] == NOT_SHOWN:
			self.xep0184_shown[id] = ALREADY_RECEIVED
			return

		buffer = self.tv.get_buffer()
		buffer.begin_user_action()

		begin_iter = buffer.get_iter_at_mark(self.xep0184_marks[id])

		end_iter = begin_iter.copy()
		# XXX: Is there a nicer way?
		end_iter.forward_char();
		end_iter.forward_char();

		buffer.delete(begin_iter, end_iter)
		buffer.delete_mark(self.xep0184_marks[id])

		buffer.end_user_action()

		del self.xep0184_marks[id]
		del self.xep0184_shown[id]

	def show_focus_out_line(self):
		if not self.allow_focus_out_line:
			# if room did not receive focus-in from the last time we added
			# --- line then do not readd
			return

		print_focus_out_line = False
		buffer = self.tv.get_buffer()

		if self.focus_out_end_mark is None:
			# this happens only first time we focus out on this room
			print_focus_out_line = True

		else:
			focus_out_end_iter = buffer.get_iter_at_mark(self.focus_out_end_mark)
			focus_out_end_iter_offset = focus_out_end_iter.get_offset()
			if focus_out_end_iter_offset != buffer.get_end_iter().get_offset():
				# this means after last-focus something was printed
				# (else end_iter's offset is the same as before)
				# only then print ---- line (eg. we avoid printing many following
				# ---- lines)
				print_focus_out_line = True

		if print_focus_out_line and buffer.get_char_count() > 0:
			buffer.begin_user_action()

			# remove previous focus out line if such focus out line exists
			if self.focus_out_end_mark is not None:
				end_iter_for_previous_line = buffer.get_iter_at_mark(
					self.focus_out_end_mark)
				begin_iter_for_previous_line = end_iter_for_previous_line.copy()
				# img_char+1 (the '\n')
				begin_iter_for_previous_line.backward_chars(2)

				# remove focus out line
				buffer.delete(begin_iter_for_previous_line,
					end_iter_for_previous_line)
				buffer.delete_mark(self.focus_out_end_mark)

			# add the new focus out line
			end_iter = buffer.get_end_iter()
			buffer.insert(end_iter, '\n')
			buffer.insert_pixbuf(end_iter,
				ConversationTextview.FOCUS_OUT_LINE_PIXBUF)

			end_iter = buffer.get_end_iter()
			before_img_iter = end_iter.copy()
			# one char back (an image also takes one char)
			before_img_iter.backward_char()
			buffer.apply_tag_by_name('focus-out-line', before_img_iter, end_iter)

			self.allow_focus_out_line = False

			# update the iter we hold to make comparison the next time
			self.focus_out_end_mark = buffer.create_mark(None,
				buffer.get_end_iter(), left_gravity=True)

			buffer.end_user_action()

			# scroll to the end (via idle in case the scrollbar has appeared)
			gobject.idle_add(self.scroll_to_end)

	def show_xep0184_warning_tooltip(self):
		pointer = self.tv.get_pointer()
		x, y = self.tv.window_to_buffer_coords(gtk.TEXT_WINDOW_TEXT,
			pointer[0], pointer[1])
		tags = self.tv.get_iter_at_location(x, y).get_tags()
		tag_table = self.tv.get_buffer().get_tag_table()
		xep0184_warning = False
		for tag in tags:
			if tag == tag_table.lookup('xep0184-warning'):
				xep0184_warning = True
				break
		if xep0184_warning and not self.xep0184_warning_tooltip.win:
			# check if the current pointer is still over the line
			position = self.tv.window.get_origin()
			self.xep0184_warning_tooltip.show_tooltip(_('This icon indicates that '
				'this message has not yet\nbeen received by the remote end. '
				"If this icon stays\nfor a long time, it's likely the message got "
				'lost.'), 8, position[1] + pointer[1])

	def show_line_tooltip(self):
		pointer = self.tv.get_pointer()
		x, y = self.tv.window_to_buffer_coords(gtk.TEXT_WINDOW_TEXT,
			pointer[0], pointer[1])
		tags = self.tv.get_iter_at_location(x, y).get_tags()
		tag_table = self.tv.get_buffer().get_tag_table()
		over_line = False
		for tag in tags:
			if tag == tag_table.lookup('focus-out-line'):
				over_line = True
				break
		if over_line and not self.line_tooltip.win:
			# check if the current pointer is still over the line
			position = self.tv.window.get_origin()
			self.line_tooltip.show_tooltip(_('Text below this line is what has '
			'been said since the last time you paid attention to this group chat'),
				8, position[1] + pointer[1])

	def on_textview_expose_event(self, widget, event):
		expalloc = event.area
		exp_x0 = expalloc.x
		exp_y0 = expalloc.y
		exp_x1 = exp_x0 + expalloc.width
		exp_y1 = exp_y0 + expalloc.height

		try:
			tryfirst = [self.image_cache[(exp_x0, exp_y0)]]
		except KeyError:
			tryfirst = []

		for image in tryfirst + self.images:
			imgalloc = image.allocation
			img_x0 = imgalloc.x
			img_y0 = imgalloc.y
			img_x1 = img_x0 + imgalloc.width
			img_y1 = img_y0 + imgalloc.height

			if img_x0 <= exp_x0 and img_y0 <= exp_y0 and \
			exp_x1 <= img_x1 and exp_y1 <= img_y1:
				self.image_cache[(img_x0, img_y0)] = image
				widget.propagate_expose(image, event)
				return True
		return False

	def on_textview_motion_notify_event(self, widget, event):
		'''change the cursor to a hand when we are over a mail or an
		url'''
		pointer_x, pointer_y, spam = self.tv.window.get_pointer()
		x, y = self.tv.window_to_buffer_coords(gtk.TEXT_WINDOW_TEXT,
			pointer_x, pointer_y)
		tags = self.tv.get_iter_at_location(x, y).get_tags()
		if self.change_cursor:
			self.tv.get_window(gtk.TEXT_WINDOW_TEXT).set_cursor(
				gtk.gdk.Cursor(gtk.gdk.XTERM))
			self.change_cursor = None
		tag_table = self.tv.get_buffer().get_tag_table()
		over_line = False
		xep0184_warning = False
		for tag in tags:
			if tag in (tag_table.lookup('url'), tag_table.lookup('mail')):
				self.tv.get_window(gtk.TEXT_WINDOW_TEXT).set_cursor(
					gtk.gdk.Cursor(gtk.gdk.HAND2))
				self.change_cursor = tag
			elif tag == tag_table.lookup('focus-out-line'):
				over_line = True
			elif tag == tag_table.lookup('xep0184-warning'):
				xep0184_warning = True

		if self.line_tooltip.timeout != 0:
			# Check if we should hide the line tooltip
			if not over_line:
				self.line_tooltip.hide_tooltip()
		if over_line and not self.line_tooltip.win:
			self.line_tooltip.timeout = gobject.timeout_add(500,
				self.show_line_tooltip)
			self.tv.get_window(gtk.TEXT_WINDOW_TEXT).set_cursor(
				gtk.gdk.Cursor(gtk.gdk.LEFT_PTR))
			self.change_cursor = tag
		if xep0184_warning and not self.xep0184_warning_tooltip.win:
			self.xep0184_warning_tooltip.timeout = \
				gobject.timeout_add(500,
				self.show_xep0184_warning_tooltip)
			self.tv.get_window(gtk.TEXT_WINDOW_TEXT).set_cursor(
				gtk.gdk.Cursor(gtk.gdk.LEFT_PTR))
			self.change_cursor = tag

	def clear(self, tv = None):
		'''clear text in the textview'''
		buffer = self.tv.get_buffer()
		start, end = buffer.get_bounds()
		buffer.delete(start, end)
		size = gajim.config.get('max_conversation_lines')
		size = 2 * size - 1
		self.marks_queue = Queue.Queue(size)
		self.focus_out_end_mark = None

	def visit_url_from_menuitem(self, widget, link):
		'''basically it filters out the widget instance'''
		helpers.launch_browser_mailer('url', link)

	def on_textview_populate_popup(self, textview, menu):
		'''we override the default context menu and we prepend Clear
		(only if used_in_history_window is False)
		and if we have sth selected we show a submenu with actions on 
		the phrase (see on_conversation_textview_button_press_event)'''

		separator_menuitem_was_added = False
		if not self.used_in_history_window:
			item = gtk.SeparatorMenuItem()
			menu.prepend(item)
			separator_menuitem_was_added = True

			item = gtk.ImageMenuItem(gtk.STOCK_CLEAR)
			menu.prepend(item)
			id = item.connect('activate', self.clear)
			self.handlers[id] = item

		if self.selected_phrase:
			if not separator_menuitem_was_added:
				item = gtk.SeparatorMenuItem()
				menu.prepend(item)

			self.selected_phrase = helpers.reduce_chars_newlines(
				self.selected_phrase, 25, 2)
			item = gtk.MenuItem(_('_Actions for "%s"') % self.selected_phrase)
			menu.prepend(item)
			submenu = gtk.Menu()
			item.set_submenu(submenu)

			always_use_en = gajim.config.get('always_english_wikipedia')
			if always_use_en:
				link = 'http://en.wikipedia.org/wiki/Special:Search?search=%s'\
					% self.selected_phrase
			else:
				link = 'http://%s.wikipedia.org/wiki/Special:Search?search=%s'\
					% (gajim.LANG, self.selected_phrase)
			item = gtk.MenuItem(_('Read _Wikipedia Article'))
			id = item.connect('activate', self.visit_url_from_menuitem, link)
			self.handlers[id] = item
			submenu.append(item)

			item = gtk.MenuItem(_('Look it up in _Dictionary'))
			dict_link = gajim.config.get('dictionary_url')
			if dict_link == 'WIKTIONARY':
				# special link (yeah undocumented but default)
				always_use_en = gajim.config.get('always_english_wiktionary')
				if always_use_en:
					link = 'http://en.wiktionary.org/wiki/Special:Search?search=%s'\
						% self.selected_phrase
				else:
					link = 'http://%s.wiktionary.org/wiki/Special:Search?search=%s'\
						% (gajim.LANG, self.selected_phrase)
				id = item.connect('activate', self.visit_url_from_menuitem, link)
				self.handlers[id] = item
			else:
				if dict_link.find('%s') == -1:
					# we must have %s in the url if not WIKTIONARY
					item = gtk.MenuItem(_(
						'Dictionary URL is missing an "%s" and it is not WIKTIONARY'))
					item.set_property('sensitive', False)
				else:
					link = dict_link % self.selected_phrase
					id = item.connect('activate', self.visit_url_from_menuitem,
						link)
					self.handlers[id] = item
			submenu.append(item)


			search_link = gajim.config.get('search_engine')
			if search_link.find('%s') == -1:
				# we must have %s in the url
				item = gtk.MenuItem(_('Web Search URL is missing an "%s"'))
				item.set_property('sensitive', False)
			else:
				item = gtk.MenuItem(_('Web _Search for it'))
				link =	search_link % self.selected_phrase
				id = item.connect('activate', self.visit_url_from_menuitem, link)
				self.handlers[id] = item
			submenu.append(item)

			item = gtk.MenuItem(_('Open as _Link'))
			id = item.connect('activate', self.visit_url_from_menuitem, link)
			self.handlers[id] = item
			submenu.append(item)

		menu.show_all()

	def on_textview_button_press_event(self, widget, event):
		# If we clicked on a taged text do NOT open the standard popup menu
		# if normal text check if we have sth selected
		self.selected_phrase = '' # do not move belove event button check!

		if event.button != 3: # if not right click
			return False

		x, y = self.tv.window_to_buffer_coords(gtk.TEXT_WINDOW_TEXT,
			int(event.x), int(event.y))
		iter = self.tv.get_iter_at_location(x, y)
		tags = iter.get_tags()


		if tags: # we clicked on sth special (it can be status message too)
			for tag in tags:
				tag_name = tag.get_property('name')
				if tag_name in ('url', 'mail'):
					return True # we block normal context menu

		# we check if sth was selected and if it was we assign
		# selected_phrase variable
		# so on_conversation_textview_populate_popup can use it
		buffer = self.tv.get_buffer()
		return_val = buffer.get_selection_bounds()
		if return_val: # if sth was selected when we right-clicked
			# get the selected text
			start_sel, finish_sel = return_val[0], return_val[1]
			self.selected_phrase = buffer.get_text(start_sel, finish_sel).decode(
				'utf-8')
		elif ord(iter.get_char()) > 31:
			# we clicked on a word, do as if it's selected for context menu
			start_sel = iter.copy()
			if not start_sel.starts_word():
				start_sel.backward_word_start()
			finish_sel = iter.copy()
			if not finish_sel.ends_word():
				finish_sel.forward_word_end()
			self.selected_phrase = buffer.get_text(start_sel, finish_sel).decode(
				'utf-8')

	def on_open_link_activate(self, widget, kind, text):
		helpers.launch_browser_mailer(kind, text)

	def on_copy_link_activate(self, widget, text):
		clip = gtk.clipboard_get()
		clip.set_text(text)

	def on_start_chat_activate(self, widget, jid):
		gajim.interface.new_chat_from_jid(self.account, jid)

	def on_join_group_chat_menuitem_activate(self, widget, room_jid):
		if 'join_gc' in gajim.interface.instances[self.account]:
			instance = gajim.interface.instances[self.account]['join_gc']
			instance.xml.get_widget('room_jid_entry').set_text(room_jid)
			gajim.interface.instances[self.account]['join_gc'].window.present()
		else:
			try:
				gajim.interface.instances[self.account]['join_gc'] = \
				dialogs.JoinGroupchatWindow(self.account, room_jid)
			except GajimGeneralException:
				pass

	def on_add_to_roster_activate(self, widget, jid):
		dialogs.AddNewContactWindow(self.account, jid)

	def make_link_menu(self, event, kind, text):
		xml = gtkgui_helpers.get_glade('chat_context_menu.glade')
		menu = xml.get_widget('chat_context_menu')
		childs = menu.get_children()
		if kind == 'url':
			id = childs[0].connect('activate', self.on_copy_link_activate, text)
			self.handlers[id] = childs[0]
			id = childs[1].connect('activate', self.on_open_link_activate, kind,
				text)
			self.handlers[id] = childs[1]
			childs[2].hide() # copy mail address
			childs[3].hide() # open mail composer
			childs[4].hide() # jid section separator
			childs[5].hide() # start chat
			childs[6].hide() # join group chat
			childs[7].hide() # add to roster
		else: # It's a mail or a JID
			# load muc icon
			join_group_chat_menuitem = xml.get_widget('join_group_chat_menuitem')
			muc_icon = gtkgui_helpers.load_icon('muc_active')
			if muc_icon:
				join_group_chat_menuitem.set_image(muc_icon)

			text = text.lower()
			id = childs[2].connect('activate', self.on_copy_link_activate, text)
			self.handlers[id] = childs[2]
			id = childs[3].connect('activate', self.on_open_link_activate, kind,
				text)
			self.handlers[id] = childs[3]
			id = childs[5].connect('activate', self.on_start_chat_activate, text)
			self.handlers[id] = childs[5]
			id = childs[6].connect('activate',
				self.on_join_group_chat_menuitem_activate, text)
			self.handlers[id] = childs[6]

			allow_add = False
			c = gajim.contacts.get_first_contact_from_jid(self.account, text)
			if c and not gajim.contacts.is_pm_from_contact(self.account, c):
				if _('Not in Roster') in c.groups:
					allow_add = True
			else: # he or she's not at all in the account contacts
				allow_add = True

			if allow_add:
				id = childs[7].connect('activate', self.on_add_to_roster_activate,
					text)
				self.handlers[id] = childs[7]
				childs[7].show() # show add to roster menuitem
			else:
				childs[7].hide() # hide add to roster menuitem

			childs[0].hide() # copy link location
			childs[1].hide() # open link in browser

		menu.popup(None, None, None, event.button, event.time)

	def hyperlink_handler(self, texttag, widget, event, iter, kind):
		if event.type == gtk.gdk.BUTTON_PRESS:
			begin_iter = iter.copy()
			# we get the begining of the tag
			while not begin_iter.begins_tag(texttag):
				begin_iter.backward_char()
			end_iter = iter.copy()
			# we get the end of the tag
			while not end_iter.ends_tag(texttag):
				end_iter.forward_char()
			word = self.tv.get_buffer().get_text(begin_iter, end_iter).decode(
				'utf-8')
			if event.button == 3: # right click
				self.make_link_menu(event, kind, word)
			else:
				# we launch the correct application
				helpers.launch_browser_mailer(kind, word)

	def html_hyperlink_handler(self, texttag, widget, event, iter, kind, href):
		if event.type == gtk.gdk.BUTTON_PRESS:
			if event.button == 3: # right click
				self.make_link_menu(event, kind, href)
				return True
			else:
				# we launch the correct application
				helpers.launch_browser_mailer(kind, href)


	def detect_and_print_special_text(self, otext, other_tags):
		'''detects special text (emots & links & formatting)
		prints normal text before any special text it founts,
		then print special text (that happens many times until
		last special text is printed) and then returns the index
		after *last* special text, so we can print it in
		print_conversation_line()'''

		buffer = self.tv.get_buffer()

		start = 0
		end = 0
		index = 0

		# basic: links + mail + formatting is always checked (we like that)
		if gajim.config.get('emoticons_theme'): # search for emoticons & urls
			iterator = gajim.interface.emot_and_basic_re.finditer(otext)
		else: # search for just urls + mail + formatting
			iterator = gajim.interface.basic_pattern_re.finditer(otext)
		for match in iterator:
			start, end = match.span()
			special_text = otext[start:end]
			if start != 0:
				text_before_special_text = otext[index:start]
				end_iter = buffer.get_end_iter()
				# we insert normal text
				buffer.insert_with_tags_by_name(end_iter,
					text_before_special_text, *other_tags)
			index = end # update index

			# now print it
			self.print_special_text(special_text, other_tags)

		return index # the position after *last* special text

	def latex_to_image(self, str):
		result = None
		exitcode = 0

		# some latex commands are really bad
		blacklist = ['\\def', '\\let', '\\futurelet',
			'\\newcommand', '\\renewcomment', '\\else', '\\fi', '\\write',
			'\\input', '\\include', '\\chardef', '\\catcode', '\\makeatletter',
			'\\noexpand', '\\toksdef', '\\every', '\\errhelp', '\\errorstopmode',
			'\\scrollmode', '\\nonstopmode', '\\batchmode', '\\read', '\\csname',
			'\\newhelp', '\\relax', '\\afterground', '\\afterassignment',
			'\\expandafter', '\\noexpand', '\\special', '\\command', '\\loop',
			'\\repeat', '\\toks', '\\output', '\\line', '\\mathcode', '\\name',
			'\\item', '\\section', '\\mbox', '\\DeclareRobustCommand', '\\[',
			'\\]']

		str = str[2:len(str)-2]

		# filter latex code with bad commands
		for word in blacklist:
			if word in str:
				exitcode = 1
				break

		if exitcode == 0:
			random.seed()
			tmpfile = os.path.join(gettempdir(), 'gajimtex_' + random.randint(0,
				100).__str__())

			# build latex string
			texstr = '\\documentclass[12pt]{article}\\usepackage[dvips]{graphicx}'
			texstr += '\\usepackage{amsmath}\\usepackage{amssymb}'
			texstr += '\\pagestyle{empty}'
			texstr += '\\begin{document}\\begin{large}\\begin{gather*}'
			texstr += str
			texstr += '\\end{gather*}\\end{large}\\end{document}'

			file = open(os.path.join(tmpfile + '.tex'), 'w+')
			file.write(texstr)
			file.flush()
			file.close()

			p = Popen(['latex', '--interaction=nonstopmode', tmpfile + '.tex'],
				cwd=gettempdir())
			exitcode = p.wait()

		if exitcode == 0:
			p = Popen(['dvips', '-E', '-o', tmpfile + '.ps', tmpfile + '.dvi'],
				cwd=gettempdir())
			exitcode = p.wait()

		if exitcode == 0:
			latex_png_dpi = gajim.config.get('latex_png_dpi')
			p = Popen(['convert', '-background', 'white', '-flatten', '-density', latex_png_dpi, tmpfile + '.ps', tmpfile + '.png'],
				cwd=gettempdir())
			exitcode = p.wait()

		extensions = ['.tex', '.log', '.aux', '.dvi', '.ps']
		for ext in extensions:
			try:
				os.remove(tmpfile + ext)
			except Exception:
				pass

		if exitcode == 0:
			result = tmpfile + '.png'

		return result

	def print_special_text(self, special_text, other_tags):
		'''is called by detect_and_print_special_text and prints
		special text (emots, links, formatting)'''
		tags = []
		use_other_tags = True
		text_is_valid_uri = False
		show_ascii_formatting_chars = \
			gajim.config.get('show_ascii_formatting_chars')
		buffer = self.tv.get_buffer()

		# Check if we accept this as an uri
		schemes = gajim.config.get('uri_schemes').split()
		for scheme in schemes:
			if special_text.startswith(scheme + ':'):
				text_is_valid_uri = True