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gtkgui_helpers.py

##    gtkgui_helpers.py
##
## Copyright (C) 2003-2006 Yann Le Boulanger <asterix@lagaule.org>
## Copyright (C) 2004-2005 Vincent Hanquez <tab@snarc.org>
## Copyright (C) 2005-2006 Nikos Kouremenos <nkour@jabber.org>
## Copyright (C) 2005 Dimitur Kirov <dkirov@gmail.com>
## Copyright (C) 2005 Travis Shirk <travis@pobox.com>
## Copyright (C) 2005 Norman Rasmussen <norman@rasmussen.co.za>
##
## This program 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 2 only.
##
## This program 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.
##

import xml.sax.saxutils
import gtk
import gobject
import pango
import os
import sys

import vcard


HAS_PYWIN32 = True
if os.name == 'nt':
      try:
            import win32file
            import win32con
            import pywintypes
      except ImportError:
            HAS_PYWIN32 = False

from common import i18n
i18n.init()
_ = i18n._
from common import gajim
from common import helpers

screen_w = gtk.gdk.screen_width()
screen_h = gtk.gdk.screen_height()

def popup_emoticons_under_button(menu, button, parent_win):
      ''' pops emoticons menu under button, which is in parent_win'''
      window_x1, window_y1 = parent_win.get_origin()
      def position_menu_under_button(menu):
            # inline function, which will not keep refs, when used as CB
            button_x, button_y = button.allocation.x, button.allocation.y
            
            # now convert them to X11-relative
            window_x, window_y = window_x1, window_y1
            x = window_x + button_x
            y = window_y + button_y

            menu_width, menu_height = menu.size_request()

            ## should we pop down or up?
            if (y + button.allocation.height + menu_height
                  < gtk.gdk.screen_height()):
                  # now move the menu below the button
                  y += button.allocation.height
            else:
                  # now move the menu above the button
                  y -= menu_height

            # push_in is True so all the menuitems are always inside screen
            push_in = True
            return (x, y, push_in)

      menu.popup(None, None, position_menu_under_button, 1, 0)
      
def get_theme_font_for_option(theme, option):
      '''return string description of the font, stored in
      theme preferences'''
      font_name = gajim.config.get_per('themes', theme, option)
      font_desc = pango.FontDescription()
      font_prop_str =  gajim.config.get_per('themes', theme, option + 'attrs')
      if font_prop_str:
            if font_prop_str.find('B') != -1:
                  font_desc.set_weight(pango.WEIGHT_BOLD)
            if font_prop_str.find('I') != -1:
                  font_desc.set_style(pango.STYLE_ITALIC)
      fd = pango.FontDescription(font_name)
      fd.merge(font_desc, True)
      return fd.to_string()
      
def get_default_font():
      '''Get the desktop setting for application font
      first check for GNOME, then XFCE and last KDE
      it returns None on failure or else a string 'Font Size' '''
      
      try:
            import gconf
            # in try because daemon may not be there
            client = gconf.client_get_default()

            return helpers.ensure_unicode_string(
                  client.get_string('/desktop/gnome/interface/font_name'))
      except:
            pass

      # try to get xfce default font
      # Xfce 4.2 adopts freedesktop.org's Base Directory Specification
      # see http://www.xfce.org/~benny/xfce/file-locations.html
      # and http://freedesktop.org/Standards/basedir-spec
      xdg_config_home = os.environ.get('XDG_CONFIG_HOME', '')
      if xdg_config_home == '':
            xdg_config_home = os.path.expanduser('~/.config') # default 
      xfce_config_file = os.path.join(xdg_config_home, 'xfce4/mcs_settings/gtk.xml')
      
      kde_config_file = os.path.expanduser('~/.kde/share/config/kdeglobals')
      
      if os.path.exists(xfce_config_file):
            try:
                  for line in file(xfce_config_file):
                        if line.find('name="Gtk/FontName"') != -1:
                              start = line.find('value="') + 7
                              return helpers.ensure_unicode_string(
                                    line[start:line.find('"', start)])
            except:
                  #we talk about file
                  print >> sys.stderr, _('Error: cannot open %s for reading') % xfce_config_file
      
      elif os.path.exists(kde_config_file):
            try:
                  for line in file(kde_config_file):
                        if line.find('font=') == 0: # font=Verdana,9,other_numbers
                              start = 5 # 5 is len('font=')
                              line = line[start:]
                              values = line.split(',')
                              font_name = values[0]
                              font_size = values[1]
                              font_string = '%s %s' % (font_name, font_size) # Verdana 9
                              return helpers.ensure_unicode_string(font_string)
            except:
                  #we talk about file
                  print >> sys.stderr, _('Error: cannot open %s for reading') % kde_config_file
      
      return None
      
def reduce_chars_newlines(text, max_chars = 0, max_lines = 0):
      '''Cut the chars after 'max_chars' on each line
      and show only the first 'max_lines'.
      If any of the params is not present (None or 0) the action
      on it is not performed'''

      def _cut_if_long(str):
            if len(str) > max_chars:
                  str = str[:max_chars - 3] + '...'
            return str
      
      if max_lines == 0:
            lines = text.split('\n')
      else:
            lines = text.split('\n', max_lines)[:max_lines]
      if max_chars > 0:
            if lines:
                  lines = map(lambda e: _cut_if_long(e), lines)
      if lines:
            reduced_text = reduce(lambda e, e1: e + '\n' + e1, lines)
      else:
            reduced_text = ''
      return reduced_text

def escape_for_pango_markup(string):
      # escapes < > & ' "
      # for pango markup not to break
      if string is None:
            return
      if gtk.pygtk_version >= (2, 8, 0) and gtk.gtk_version >= (2, 8, 0):
            escaped_str = gobject.markup_escape_text(string)
      else:
            escaped_str = xml.sax.saxutils.escape(string, {"'": '&apos;',
                  '"': '&quot;'})
      
      return escaped_str

def autodetect_browser_mailer():
      # recognize the environment for appropriate browser/mailer
      if os.path.isdir('/proc'):
            # under Linux: checking if 'gnome-session' or
            # 'startkde' programs were run before gajim, by
            # checking /proc (if it exists)
            #
            # if something is unclear, read `man proc`;
            # if /proc exists, directories that have only numbers
            # in their names contain data about processes.
            # /proc/[xxx]/exe is a symlink to executable started
            # as process number [xxx].
            # filter out everything that we are not interested in:
            files = os.listdir('/proc')

            # files that doesn't have only digits in names...
            files = filter(str.isdigit, files)

            # files that aren't directories...
            files = filter(lambda f:os.path.isdir('/proc/' + f), files)

            # processes owned by somebody not running gajim...
            # (we check if we have access to that file)
            files = filter(lambda f:os.access('/proc/' + f +'/exe', os.F_OK), files)

            # be sure that /proc/[number]/exe is really a symlink
            # to avoid TBs in incorrectly configured systems
            files = filter(lambda f:os.path.islink('/proc/' + f + '/exe'), files)

            # list of processes
            processes = [os.path.basename(os.readlink('/proc/' + f +'/exe')) for f in files]
            if 'gnome-session' in processes:
                  gajim.config.set('openwith', 'gnome-open')
            elif 'startkde' in processes:
                  gajim.config.set('openwith', 'kfmclient exec')
            else:
                  gajim.config.set('openwith', 'custom')

def move_window(window, x, y):
      '''moves the window but also checks if out of screen'''
      if x < 0:
            x = 0
      if y < 0:
            y = 0
      window.move(x, y)

def resize_window(window, w, h):
      '''resizes window but also checks if huge window or negative values'''
      if not w or not h:
            return
      if w > screen_w:
            w = screen_w
      if h > screen_h:
            h = screen_h
      window.resize(abs(w), abs(h))

class TagInfoHandler(xml.sax.ContentHandler):
      def __init__(self, tagname1, tagname2):
            xml.sax.ContentHandler.__init__(self)
            self.tagname1 = tagname1
            self.tagname2 = tagname2
            self.servers = []

      def startElement(self, name, attributes):
            if name == self.tagname1:
                  for attribute in attributes.getNames():
                        if attribute == 'jid':
                              jid = attributes.getValue(attribute)
                              # we will get the port next time so we just set it 0 here
                              self.servers.append([jid, 0])
            elif name == self.tagname2:
                  for attribute in attributes.getNames():
                        if attribute == 'port':
                              port = attributes.getValue(attribute)
                              # we received the jid last time, so we now assign the port
                              # number to the last jid in the list
                              self.servers[-1][1] = port

      def endElement(self, name):
            pass

def parse_server_xml(path_to_file):
      try:
            handler = TagInfoHandler('item', 'active')
            xml.sax.parse(path_to_file, handler)
            return handler.servers
      # handle exception if unable to open file
      except IOError, message:
            print >> sys.stderr, _('Error reading file:'), message
      # handle exception parsing file
      except xml.sax.SAXParseException, message:
            print >> sys.stderr, _('Error parsing file:'), message

def set_unset_urgency_hint(window, unread_messages_no):
      '''sets/unsets urgency hint in window argument
      depending if we have unread messages or not'''
      if gtk.gtk_version >= (2, 8, 0) and gtk.pygtk_version >= (2, 8, 0) and \
            gajim.config.get('use_urgency_hint'):
            if unread_messages_no > 0:
                  window.props.urgency_hint = True
            else:
                  window.props.urgency_hint = False

def get_abspath_for_script(scriptname, want_type = False):
      '''checks if we are svn or normal user and returns abspath to asked script
      if want_type is True we return 'svn' or 'install' '''
      if os.path.isdir('.svn'): # we are svn user
            type = 'svn'
            cwd = os.getcwd() # it's always ending with src

            if scriptname == 'gajim-remote':
                  path_to_script = cwd + '/gajim-remote.py'
            
            elif scriptname == 'gajim':
                  script = '#!/bin/sh\n' # the script we may create
                  script += 'cd %s' % cwd
                  path_to_script = cwd + '/../scripts/gajim_sm_script'
                        
                  try:
                        if os.path.exists(path_to_script):
                              os.remove(path_to_script)

                        f = open(path_to_script, 'w')
                        script += '\nexec python -OOt gajim.py $0 $@\n'
                        f.write(script)
                        f.close()
                        os.chmod(path_to_script, 0700)
                  except OSError: # do not traceback (could be a permission problem)
                        #we talk about a file here
                        s = _('Could not write to %s. Session Management support will not work') % path_to_script
                        print >> sys.stderr, s

      else: # normal user (not svn user)
            type = 'install'
            # always make it like '/usr/local/bin/gajim'
            path_to_script = helpers.is_in_path(scriptname, True)
            
      
      if want_type:
            return path_to_script, type
      else:
            return path_to_script

def get_pixbuf_from_data(file_data, want_type = False):
      '''Gets image data and returns gtk.gdk.Pixbuf
      if want_type is True it also returns 'jpeg', 'png' etc'''
      pixbufloader = gtk.gdk.PixbufLoader()
      try:
            pixbufloader.write(file_data)
            pixbufloader.close()
            pixbuf = pixbufloader.get_pixbuf()
      except gobject.GError: # 'unknown image format'
            pixbuf = None

      if want_type:
            typ = pixbufloader.get_format()['name']
            return pixbuf, typ
      else:
            return pixbuf

def get_invisible_cursor():
      pixmap = gtk.gdk.Pixmap(None, 1, 1, 1)
      color = gtk.gdk.Color()
      cursor = gtk.gdk.Cursor(pixmap, pixmap, color, color, 0, 0)
      return cursor

def get_current_desktop(window):
      '''returns the current virtual desktop for given window
      NOTE: window is GDK window'''
      prop = window.property_get('_NET_CURRENT_DESKTOP')
      if prop is None: # it means it's normal window (not root window)
            # so we look for it's current virtual desktop in another property
            prop = window.property_get('_NET_WM_DESKTOP')

      if prop is not None:
            # f.e. prop is ('CARDINAL', 32, [0]) we want 0 or 1.. from [0]
            current_virtual_desktop_no = prop[2][0]
            return current_virtual_desktop_no

def possibly_move_window_in_current_desktop(window):
      '''moves GTK window to current virtual desktop if it is not in the
      current virtual desktop
      window is GTK window'''
      if os.name == 'nt':
            return

      root_window = gtk.gdk.screen_get_default().get_root_window()
      # current user's vd
      current_virtual_desktop_no = get_current_desktop(root_window)
      
      # vd roster window is in
      window_virtual_desktop = get_current_desktop(window.window)

      # if one of those is None, something went wrong and we cannot know
      # VD info, just hide it (default action) and not show it afterwards
      if None not in (window_virtual_desktop, current_virtual_desktop_no):
            if current_virtual_desktop_no != window_virtual_desktop:
                  # we are in another VD that the window was
                  # so show it in current VD
                  window.show()

def file_is_locked(path_to_file):
      '''returns True if file is locked (WINDOWS ONLY)'''
      if os.name != 'nt': # just in case
            return
      
      if not HAS_PYWIN32:
            return
      
      secur_att = pywintypes.SECURITY_ATTRIBUTES()
      secur_att.Initialize()
      
      try:
            # try make a handle for READING the file
            hfile = win32file.CreateFile(
                  path_to_file,                             # path to file
                  win32con.GENERIC_READ,              # open for reading
                  0,                                              # do not share with other proc
                  secur_att,
                  win32con.OPEN_EXISTING,             # existing file only
                  win32con.FILE_ATTRIBUTE_NORMAL,     # normal file
                  0                                               # no attr. template
            )
      except pywintypes.error, e:
            return True
      else: # in case all went ok, close file handle (go to hell WinAPI)
            hfile.Close()
            return False

def _get_fade_color(treeview, selected, focused):
      '''get a gdk color that is between foreground and background in 0.3
      0.7 respectively colors of the cell for the given treeview'''
      style = treeview.style
      if selected:
            if focused: # is the window focused?
                  state = gtk.STATE_SELECTED
            else: # is it not? NOTE: many gtk themes change bg on this
                  state = gtk.STATE_ACTIVE
      else:
            state = gtk.STATE_NORMAL
      bg = style.base[state]
      fg = style.text[state]

      p = 0.3 # background
      q = 0.7 # foreground # p + q should do 1.0
      return gtk.gdk.Color(int(bg.red*p + fg.red*q),
                        int(bg.green*p + fg.green*q),
                        int(bg.blue*p + fg.blue*q))

def get_scaled_pixbuf(pixbuf, kind):
      '''returns scaled pixbuf, keeping ratio etc or None
      kind is either "chat" or "roster" or "notification" or "tooltip"'''
      
      # resize to a width / height for the avatar not to have distortion
      # (keep aspect ratio)
      width = gajim.config.get(kind + '_avatar_width')
      height = gajim.config.get(kind + '_avatar_height')
      if width < 1 or height < 1:
            return None

      # Pixbuf size
      pix_width = pixbuf.get_width()
      pix_height = pixbuf.get_height()
      # don't make avatars bigger than they are
      if pix_width < width and pix_height < height:
            return pixbuf # we don't want to make avatar bigger

      ratio = float(pix_width) / float(pix_height)
      if ratio > 1:
            w = width
            h = int(w / ratio)
      else:
            h = height
            w = int(h * ratio)
      scaled_buf = pixbuf.scale_simple(w, h, gtk.gdk.INTERP_HYPER)
      return scaled_buf

def get_avatar_pixbuf_from_cache(fjid, is_fake_jid = False):
      '''checks if jid has cached avatar and if that avatar is valid image
      (can be shown)
      returns None if there is no image in vcard
      returns 'ask' if cached vcard should not be used (user changed his vcard,
      so we have new sha) or if we don't have the vcard'''

      jid, nick = gajim.get_room_and_nick_from_fjid(fjid)
      if gajim.config.get('hide_avatar_of_transport') and\
            gajim.jid_is_transport(jid):
            # don't show avatar for the transport itself
            return None

      puny_jid = helpers.sanitize_filename(jid)
      if is_fake_jid:
            puny_nick = helpers.sanitize_filename(nick)
            path = os.path.join(gajim.VCARD_PATH, puny_jid, puny_nick)
      else:
            path = os.path.join(gajim.VCARD_PATH, puny_jid)
      if not os.path.isfile(path):
            return 'ask'

      vcard_dict = gajim.connections.values()[0].get_cached_vcard(fjid,
            is_fake_jid)
      if not vcard_dict: # This can happen if cached vcard is too old
            return 'ask'
      if not vcard_dict.has_key('PHOTO'):
            return None
      pixbuf = vcard.get_avatar_pixbuf_encoded_mime(vcard_dict['PHOTO'])[0]
      return pixbuf

def make_gtk_month_python_month(month):
      '''gtk start counting months from 0, so January is 0
      but python's time start from 1, so align to python
      month MUST be integer'''
      return month + 1

def make_python_month_gtk_month(month):
      return month - 1

def make_color_string(color):
      '''create #aabbcc color string from gtk color'''
      col = '#'
      for i in (color.red, color.green, color.blue):
            h = hex(i)[2:4]
            if len(h) == 1:
                  h = '0' + h
            col += h
      return col

def make_pixbuf_grayscale(pixbuf):
      pixbuf2 = pixbuf.copy()
      pixbuf.saturate_and_pixelate(pixbuf2, 0.0, False)
      return pixbuf2

def get_path_to_generic_or_avatar(generic, jid = None, suffix = None):
      '''Chooses between avatar image and default image.
      Returns full path to the avatar image if it exists,
      otherwise returns full path to the image.'''
      if jid:
            puny_jid = helpers.sanitize_filename(jid)
            path_to_file = os.path.join(gajim.AVATAR_PATH, puny_jid) + suffix
            if os.path.exists(path_to_file):
                  return path_to_file
      return os.path.abspath(generic)

def decode_filechooser_file_paths(file_paths):
      '''decode as UTF-8 under Windows and
      ask sys.getfilesystemencoding() in POSIX
      file_paths MUST be LIST'''
      file_paths_list = list()
      
      if os.name == 'nt': # decode as UTF-8 under Windows
            for file_path in file_paths:
                  file_path = file_path.decode('utf8')
                  file_paths_list.append(file_path)
      else:
            for file_path in file_paths:
                  try:
                        file_path = file_path.decode(sys.getfilesystemencoding())
                  except:
                        try:
                              file_path = file_path.decode('utf-8')
                        except:
                              pass
                  file_paths_list.append(file_path)
      
      return file_paths_list

def possibly_set_gajim_as_xmpp_handler():
      '''registers (by default only the first time) xmmp: to Gajim.'''
      try:
            import gconf
            # in try because daemon may not be there
            client = gconf.client_get_default()
      except:
            return
      
      
      path_to_dot_kde = os.path.expanduser('~/.kde')
      if os.path.exists(path_to_dot_kde):
            path_to_kde_file = os.path.join(path_to_dot_kde, 
                  'share/services/xmpp.protocol')
            if not os.path.exists(path_to_kde_file):
                  path_to_kde_file = None
      else:
            path_to_kde_file = None
      
      if gajim.config.get('set_xmpp://_handler_everytime'):
                  # it's false by default
                  we_set = True
      elif client.get_string('/desktop/gnome/url-handlers/xmpp/command') is None:
            # only the first time (GNOME/GCONF)
            we_set = True
      elif path_to_kde_file is not None and not os.path.exists(path_to_kde_file):
            # only the first time (KDE)
            we_set = True
      else:
            we_set = False
            
      if not we_set:
            return
      
      path_to_gajim_script, typ = get_abspath_for_script('gajim-remote', True)
      if path_to_gajim_script:
            if typ == 'svn':
                  command = path_to_gajim_script + ' open_chat %s'
            else: # 'installed'
                  command = 'gajim-remote open_chat %s'
            
            # setting for GNOME/Gconf
            client.set_bool('/desktop/gnome/url-handlers/xmpp/enabled', True)
            client.set_string('/desktop/gnome/url-handlers/xmpp/command', command)
            client.set_bool('/desktop/gnome/url-handlers/xmpp/needs_terminal', False)
            
            # setting for KDE
            if path_to_kde_file is not None: # user has run kde at least once
                  f = open(path_to_kde_file, 'w')
                  f.write('''\
[Protocol]
exec=%s "%%u"
protocol=xmpp
input=none
output=none
helper=true
listing=false
reading=false
writing=false
makedir=false
deleting=false
icon=gajim
Description=xmpp
''' % command)
                  f.close()

def escape_underscore(s):
      '''Escape underlines to prevent them from being interpreted
      as keyboard accelerators'''
      return s.replace('_', '__')

def get_state_image_from_file_path_show(file_path, show):
      state_file = show.replace(' ', '_')
      files = []
      files.append(os.path.join(file_path, state_file + '.png'))
      files.append(os.path.join(file_path, state_file + '.gif'))
      image = gtk.Image()
      image.set_from_pixbuf(None)
      for file_ in files:
            if os.path.exists(file_):
                  image.set_from_file(file_)
                  break

      return image

def get_possible_button_event(event):
      '''mouse or keyboard caused the event?'''
      if event.type == gtk.gdk.KEY_PRESS:
            event_button = 0 # no event.button so pass 0
      else: # BUTTON_PRESS event, so pass event.button
            event_button = event.button

      return event_button

def destroy_widget(widget):
      widget.destroy()

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