openlp/openlp/core/utils/__init__.py

# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=80 tabstop=4 softtabstop=4

###############################################################################
# OpenLP - Open Source Lyrics Projection                                      #
# --------------------------------------------------------------------------- #
# Copyright (c) 2008-2011 Raoul Snyman                                        #
# Portions copyright (c) 2008-2011 Tim Bentley, Jonathan Corwin, Michael      #
# Gorven, Scott Guerrieri, Meinert Jordan, Andreas Preikschat, Christian      #
# Richter, Philip Ridout, Maikel Stuivenberg, Martin Thompson, Jon Tibble,    #
# Carsten Tinggaard, Frode Woldsund                                           #
# --------------------------------------------------------------------------- #
# 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 of the License.                              #
#                                                                             #
# 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.                                                               #
#                                                                             #
# You should have received a copy of the GNU General Public License along     #
# with this program; if not, write to the Free Software Foundation, Inc., 59  #
# Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
###############################################################################
"""
The :mod:`openlp.core.utils` module provides the utility libraries for OpenLP.
"""
import logging
import os
import re
import sys
import time
import urllib2
from datetime import datetime

from PyQt4 import QtGui, QtCore
if sys.platform != u'win32' and sys.platform != u'darwin':
    try:
        from xdg import BaseDirectory
        XDG_BASE_AVAILABLE = True
    except ImportError:
        XDG_BASE_AVAILABLE = False

import openlp
from openlp.core.lib import Receiver, translate

log = logging.getLogger(__name__)
IMAGES_FILTER = None
UNO_CONNECTION_TYPE = u'pipe'
#UNO_CONNECTION_TYPE = u'socket'

class VersionThread(QtCore.QThread):
    """
    A special Qt thread class to fetch the version of OpenLP from the website.
    This is threaded so that it doesn't affect the loading time of OpenLP.
    """
    def __init__(self, parent, app_version):
        QtCore.QThread.__init__(self, parent)
        self.app_version = app_version
        self.version_splitter = re.compile(
            r'([0-9]+).([0-9]+).([0-9]+)(?:-bzr([0-9]+))?')

    def run(self):
        """
        Run the thread.
        """
        time.sleep(1)
        Receiver.send_message(u'maindisplay_blank_check')
        version = check_latest_version(self.app_version)
        remote_version = {}
        local_version = {}
        match = self.version_splitter.match(version)
        if match:
            remote_version[u'major'] = int(match.group(1))
            remote_version[u'minor'] = int(match.group(2))
            remote_version[u'release'] = int(match.group(3))
            if len(match.groups()) > 3 and match.group(4):
                remote_version[u'revision'] = int(match.group(4))
        else:
            return
        match = self.version_splitter.match(self.app_version[u'full'])
        if match:
            local_version[u'major'] = int(match.group(1))
            local_version[u'minor'] = int(match.group(2))
            local_version[u'release'] = int(match.group(3))
            if len(match.groups()) > 3 and match.group(4):
                local_version[u'revision'] = int(match.group(4))
        else:
            return
        if remote_version[u'major'] > local_version[u'major'] or \
            remote_version[u'minor'] > local_version[u'minor'] or \
            remote_version[u'release'] > local_version[u'release']:
            Receiver.send_message(u'openlp_version_check', u'%s' % version)
        elif remote_version.get(u'revision') and \
            local_version.get(u'revision') and \
            remote_version[u'revision'] > local_version[u'revision']:
            Receiver.send_message(u'openlp_version_check', u'%s' % version)


class AppLocation(object):
    """
    The :class:`AppLocation` class is a static class which retrieves a
    directory based on the directory type.
    """
    AppDir = 1
    ConfigDir = 2
    DataDir = 3
    PluginsDir = 4
    VersionDir = 5
    CacheDir = 6
    LanguageDir = 7

    @staticmethod
    def get_directory(dir_type=1):
        """
        Return the appropriate directory according to the directory type.

        ``dir_type``
            The directory type you want, for instance the data directory.
        """
        if dir_type == AppLocation.AppDir:
            return _get_frozen_path(
                os.path.abspath(os.path.split(sys.argv[0])[0]),
                os.path.split(openlp.__file__)[0])
        elif dir_type == AppLocation.PluginsDir:
            app_path = os.path.abspath(os.path.split(sys.argv[0])[0])
            return _get_frozen_path(os.path.join(app_path, u'plugins'),
                os.path.join(os.path.split(openlp.__file__)[0], u'plugins'))
        elif dir_type == AppLocation.VersionDir:
            return _get_frozen_path(
                os.path.abspath(os.path.split(sys.argv[0])[0]),
                os.path.split(openlp.__file__)[0])
        elif dir_type == AppLocation.LanguageDir:
            app_path = _get_frozen_path(
                os.path.abspath(os.path.split(sys.argv[0])[0]),
                os.path.split(openlp.__file__)[0])
            return os.path.join(app_path, u'i18n')
        else:
            return _get_os_dir_path(dir_type)

    @staticmethod
    def get_data_path():
        """
        Return the path OpenLP stores all its data under.
        """
        path = AppLocation.get_directory(AppLocation.DataDir)
        if not os.path.exists(path):
            os.makedirs(path)
        return path

    @staticmethod
    def get_section_data_path(section):
        """
        Return the path a particular module stores its data under.
        """
        data_path = AppLocation.get_data_path()
        path = os.path.join(data_path, section)
        if not os.path.exists(path):
            os.makedirs(path)
        return path

def _get_os_dir_path(dir_type):
    """
    Return a path based on which OS and environment we are running in.
    """
    if sys.platform == u'win32':
        if dir_type == AppLocation.DataDir:
            return os.path.join(os.getenv(u'APPDATA'), u'openlp', u'data')
        return os.path.join(os.getenv(u'APPDATA'), u'openlp')
    elif sys.platform == u'darwin':
        if dir_type == AppLocation.DataDir:
            return os.path.join(os.getenv(u'HOME'), u'Library',
                u'Application Support', u'openlp', u'Data')
        return os.path.join(os.getenv(u'HOME'), u'Library',
            u'Application Support', u'openlp')
    else:
        if XDG_BASE_AVAILABLE:
            if dir_type == AppLocation.ConfigDir:
                return os.path.join(BaseDirectory.xdg_config_home, u'openlp')
            elif dir_type == AppLocation.DataDir:
                return os.path.join(BaseDirectory.xdg_data_home, u'openlp')
            elif dir_type == AppLocation.CacheDir:
                return os.path.join(BaseDirectory.xdg_cache_home, u'openlp')
        if dir_type == AppLocation.DataDir:
            return os.path.join(os.getenv(u'HOME'), u'.openlp', u'data')
        return os.path.join(os.getenv(u'HOME'), u'.openlp')

def _get_frozen_path(frozen_option, non_frozen_option):
    """
    Return a path based on the system status.
    """
    if hasattr(sys, u'frozen') and sys.frozen == 1:
        return frozen_option
    return non_frozen_option

def check_latest_version(current_version):
    """
    Check the latest version of OpenLP against the version file on the OpenLP
    site.

    ``current_version``
        The current version of OpenLP.
    """
    version_string = current_version[u'full']
    # set to prod in the distribution config file.
    settings = QtCore.QSettings()
    settings.beginGroup(u'general')
    last_test = unicode(settings.value(u'last version test',
        QtCore.QVariant(datetime.now().date())).toString())
    this_test = unicode(datetime.now().date())
    settings.setValue(u'last version test', QtCore.QVariant(this_test))
    settings.endGroup()
    if last_test != this_test:
        if current_version[u'build']:
            req = urllib2.Request(
                u'http://www.openlp.org/files/dev_version.txt')
        else:
            req = urllib2.Request(u'http://www.openlp.org/files/version.txt')
        req.add_header(u'User-Agent', u'OpenLP/%s' % current_version[u'full'])
        remote_version = None
        try:
            remote_version = unicode(urllib2.urlopen(req, None).read()).strip()
        except IOError:
            log.exception(u'Failed to download the latest OpenLP version file')
        if remote_version:
            version_string = remote_version
    return version_string

def add_actions(target, actions):
    """
    Adds multiple actions to a menu or toolbar in one command.

    ``target``
        The menu or toolbar to add actions to.

    ``actions``
        The actions to be added.  An action consisting of the keyword 'None'
        will result in a separator being inserted into the target.
    """
    for action in actions:
        if action is None:
            target.addSeparator()
        else:
            target.addAction(action)

def get_filesystem_encoding():
    """
    Returns the name of the encoding used to convert Unicode filenames into
    system file names.
    """
    encoding = sys.getfilesystemencoding()
    if encoding is None:
        encoding = sys.getdefaultencoding()
    return encoding

def get_images_filter():
    """
    Returns a filter string for a file dialog containing all the supported
    image formats.
    """
    global IMAGES_FILTER
    if not IMAGES_FILTER:
        log.debug(u'Generating images filter.')
        formats = [unicode(fmt)
            for fmt in QtGui.QImageReader.supportedImageFormats()]
        visible_formats = u'(*.%s)' % u'; *.'.join(formats)
        actual_formats = u'(*.%s)' % u' *.'.join(formats)
        IMAGES_FILTER = u'%s %s %s' % (translate('OpenLP', 'Image Files'),
            visible_formats, actual_formats)
    return IMAGES_FILTER

def split_filename(path):
    """
    Return a list of the parts in a given path.
    """
    path = os.path.abspath(path)
    if not os.path.isfile(path):
        return path, u''
    else:
        return os.path.split(path)

def delete_file(file_path_name):
    """
    Deletes a file from the system.

    ``file_path_name``
        The file, including path, to delete.
    """
    if not file_path_name:
        return False
    try:
        if os.path.exists(file_path_name):
            os.remove(file_path_name)
        return True
    except (IOError, OSError):
        log.exception("Unable to delete file %s" % file_path_name)
        return False

def get_web_page(url, header=None, update_openlp=False):
    """
    Attempts to download the webpage at url and returns that page or None.

    ``url``
        The URL to be downloaded.

    ``header``
        An optional HTTP header to pass in the request to the web server.

    ``update_openlp``
        Tells OpenLP to update itself if the page is successfully downloaded.
        Defaults to False.
    """
    # TODO: Add proxy usage.  Get proxy info from OpenLP settings, add to a
    # proxy_handler, build into an opener and install the opener into urllib2.
    # http://docs.python.org/library/urllib2.html
    if not url:
        return None
    req = urllib2.Request(url)
    if header:
        req.add_header(header[0], header[1])
    page = None
    log.debug(u'Downloading URL = %s' % url)
    try:
        page = urllib2.urlopen(req)
        log.debug(u'Downloaded URL = %s' % page.geturl())
    except urllib2.URLError:
        log.exception(u'The web page could not be downloaded')
    if not page:
        return None
    if update_openlp:
        Receiver.send_message(u'openlp_process_events')
    return page

def file_is_unicode(filename):
    """
    Checks if a file is valid unicode and returns the unicode decoded file or
    None.

    ``filename``
        File to check is valid unicode.
    """
    if not filename:
        return None
    ucsfile = None
    try:
        ucsfile = filename.decode(u'utf-8')
    except UnicodeDecodeError:
        log.exception(u'Filename "%s" is not valid UTF-8' %
            filename.decode(u'utf-8', u'replace'))
    if not ucsfile:
        return None
    return ucsfile

def string_is_unicode(test_string):
    """
    Makes sure a string is unicode.

    ``test_string``
        The string to confirm is unicode.
    """
    return_string = u''
    if not test_string:
        return return_string
    if isinstance(test_string, unicode):
        return_string = test_string
    if not isinstance(test_string, unicode):
        try:
            return_string = unicode(test_string, u'utf-8')
        except UnicodeError:
            log.exception("Error encoding string to unicode")
    return return_string

def get_uno_command():
    """
    Returns the UNO command to launch an openoffice.org instance.
    """
    COMMAND = u'soffice'
    OPTIONS = u'-nologo -norestore -minimized -invisible -nofirststartwizard'
    if UNO_CONNECTION_TYPE == u'pipe':
      CONNECTION = u'"-accept=pipe,name=openlp_pipe;urp;"'
    else:
      CONNECTION = u'"-accept=socket,host=localhost,port=2002;urp;"' 
    return u'%s %s %s' % (COMMAND, OPTIONS, CONNECTION)

def get_uno_instance(resolver):
    """
    Returns a running openoffice.org instance.

    ``resolver``
        The UNO resolver to use to find a running instance.
    """
    log.debug(u'get UNO Desktop Openoffice - resolve')
    if UNO_CONNECTION_TYPE == u'pipe':
        return resolver.resolve(u'uno:pipe,name=openlp_pipe;' \
            + u'urp;StarOffice.ComponentContext')
    else:
        return resolver.resolve(u'uno:socket,host=localhost,port=2002;' \
            + u'urp;StarOffice.ComponentContext')

from languagemanager import LanguageManager
from actions import ActionList

__all__ = [u'AppLocation', u'check_latest_version', u'add_actions',
    u'get_filesystem_encoding', u'LanguageManager', u'ActionList',
    u'get_web_page', u'file_is_unicode', u'string_is_unicode',
    u'get_uno_command', u'get_uno_instance', u'delete_file']