Helpviewer/Bookmarks/BookmarksManager.py

# -*- coding: utf-8 -*-

# Copyright (c) 2009 - 2012 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the bookmarks manager.
"""

import os

from PyQt4.QtCore import pyqtSignal, Qt, QT_TRANSLATE_NOOP, QObject, QFile, QByteArray, \
    QBuffer, QIODevice, QXmlStreamReader, QDate, QFileInfo, QUrl
from PyQt4.QtGui import QUndoStack, QUndoCommand, QApplication, QDialog

from E5Gui import E5MessageBox, E5FileDialog

from .BookmarkNode import BookmarkNode
from .BookmarksModel import BookmarksModel
from .DefaultBookmarks import DefaultBookmarks
from .XbelReader import XbelReader
from .XbelWriter import XbelWriter
from .BookmarksImportDialog import BookmarksImportDialog

from Utilities.AutoSaver import AutoSaver
import Utilities
import Preferences

BOOKMARKBAR = QT_TRANSLATE_NOOP("BookmarksManager", "Bookmarks Bar")
BOOKMARKMENU = QT_TRANSLATE_NOOP("BookmarksManager", "Bookmarks Menu")

StartRoot = 0
StartMenu = 1
StartToolBar = 2


class BookmarksManager(QObject):
    """
    Class implementing the bookmarks manager.
    
    @signal entryAdded(BookmarkNode) emitted after a bookmark node has been added
    @signal entryRemoved(BookmarkNode, int, BookmarkNode) emitted after a bookmark
        node has been removed
    @signal entryChanged(BookmarkNode) emitted after a bookmark node has been changed
    @signal bookmarksSaved() emitted after the bookmarks were saved
    @signal bookmarksReloaded() emitted after the bookmarks were reloaded
    """
    entryAdded = pyqtSignal(BookmarkNode)
    entryRemoved = pyqtSignal(BookmarkNode, int, BookmarkNode)
    entryChanged = pyqtSignal(BookmarkNode)
    bookmarksSaved = pyqtSignal()
    bookmarksReloaded = pyqtSignal()
    
    def __init__(self, parent=None):
        """
        Constructor
        
        @param parent reference to the parent object (QObject)
        """
        super().__init__(parent)
        
        self.__saveTimer = AutoSaver(self, self.save)
        self.entryAdded.connect(self.__saveTimer.changeOccurred)
        self.entryRemoved.connect(self.__saveTimer.changeOccurred)
        self.entryChanged.connect(self.__saveTimer.changeOccurred)
        
        self.__initialize()
    
    def __initialize(self):
        """
        Private method to initialize some data.
        """
        self.__loaded = False
        self.__bookmarkRootNode = None
        self.__toolbar = None
        self.__menu = None
        self.__bookmarksModel = None
        self.__commands = QUndoStack()
    
    @classmethod
    def getFileName(cls):
        """
        Public method to get the file name of the bookmark file.
        
        @return name of the bookmark file (string)
        """
        return os.path.join(Utilities.getConfigDir(), "browser", "bookmarks.xbel")
    
    def close(self):
        """
        Public method to close the bookmark manager.
        """
        self.__saveTimer.saveIfNeccessary()
    
    def undoRedoStack(self):
        """
        Public method to get a reference to the undo stack.
        
        @return reference to the undo stack (QUndoStack)
        """
        return self.__commands
    
    def changeExpanded(self):
        """
        Public method to handle a change of the expanded state.
        """
        self.__saveTimer.changeOccurred()
    
    def reload(self):
        """
        Public method used to initiate a reloading of the bookmarks.
        """
        self.__initialize()
        self.load()
        self.bookmarksReloaded.emit()
    
    def load(self):
        """
        Public method to load the bookmarks.
        """
        if self.__loaded:
            return
        
        self.__loaded = True
        
        bookmarkFile = self.getFileName()
        if not QFile.exists(bookmarkFile):
            ba = QByteArray(DefaultBookmarks)
            bookmarkFile = QBuffer(ba)
            bookmarkFile.open(QIODevice.ReadOnly)
        
        reader = XbelReader()
        self.__bookmarkRootNode = reader.read(bookmarkFile)
        if reader.error() != QXmlStreamReader.NoError:
            E5MessageBox.warning(None,
                self.trUtf8("Loading Bookmarks"),
                self.trUtf8("""Error when loading bookmarks on line {0}, column {1}:\n"""
                            """{2}""")\
                    .format(reader.lineNumber(),
                            reader.columnNumber(),
                            reader.errorString()))
        
        others = []
        for index in range(len(self.__bookmarkRootNode.children()) - 1, -1, -1):
            node = self.__bookmarkRootNode.children()[index]
            if node.type() == BookmarkNode.Folder:
                if (node.title == self.trUtf8("Toolbar Bookmarks") or \
                    node.title == BOOKMARKBAR) and \
                   self.__toolbar is None:
                    node.title = self.trUtf8(BOOKMARKBAR)
                    self.__toolbar = node
                
                if (node.title == self.trUtf8("Menu") or \
                    node.title == BOOKMARKMENU) and \
                   self.__menu is None:
                    node.title = self.trUtf8(BOOKMARKMENU)
                    self.__menu = node
            else:
                others.append(node)
            self.__bookmarkRootNode.remove(node)
        
        if len(self.__bookmarkRootNode.children()) > 0:
            raise RuntimeError("Error loading bookmarks.")
        
        if self.__toolbar is None:
            self.__toolbar = BookmarkNode(BookmarkNode.Folder, self.__bookmarkRootNode)
            self.__toolbar.title = self.trUtf8(BOOKMARKBAR)
        else:
            self.__bookmarkRootNode.add(self.__toolbar)
        
        if self.__menu is None:
            self.__menu = BookmarkNode(BookmarkNode.Folder, self.__bookmarkRootNode)
            self.__menu.title = self.trUtf8(BOOKMARKMENU)
        else:
            self.__bookmarkRootNode.add(self.__menu)
        
        for node in others:
            self.__menu.add(node)
        
        self.__convertFromOldBookmarks()
    
    def save(self):
        """
        Public method to save the bookmarks.
        """
        if not self.__loaded:
            return
        
        writer = XbelWriter()
        bookmarkFile = self.getFileName()
        
        # save root folder titles in English (i.e. not localized)
        self.__menu.title = BOOKMARKMENU
        self.__toolbar.title = BOOKMARKBAR
        if not writer.write(bookmarkFile, self.__bookmarkRootNode):
            E5MessageBox.warning(None,
                self.trUtf8("Saving Bookmarks"),
                self.trUtf8("""Error saving bookmarks to <b>{0}</b>.""")\
                    .format(bookmarkFile))
        
        # restore localized titles
        self.__menu.title = self.trUtf8(BOOKMARKMENU)
        self.__toolbar.title = self.trUtf8(BOOKMARKBAR)
        
        self.bookmarksSaved.emit()
    
    def addBookmark(self, parent, node, row=-1):
        """
        Public method to add a bookmark.
        
        @param parent reference to the node to add to (BookmarkNode)
        @param node reference to the node to add (BookmarkNode)
        @param row row number (integer)
        """
        if not self.__loaded:
            return
        
        command = InsertBookmarksCommand(self, parent, node, row)
        self.__commands.push(command)
    
    def removeBookmark(self, node):
        """
        Public method to remove a bookmark.
        
        @param node reference to the node to be removed (BookmarkNode)
        """
        if not self.__loaded:
            return
        
        parent = node.parent()
        row = parent.children().index(node)
        command = RemoveBookmarksCommand(self, parent, row)
        self.__commands.push(command)
    
    def setTitle(self, node, newTitle):
        """
        Public method to set the title of a bookmark.
        
        @param node reference to the node to be changed (BookmarkNode)
        @param newTitle title to be set (string)
        """
        if not self.__loaded:
            return
        
        command = ChangeBookmarkCommand(self, node, newTitle, True)
        self.__commands.push(command)
    
    def setUrl(self, node, newUrl):
        """
        Public method to set the URL of a bookmark.
        
        @param node reference to the node to be changed (BookmarkNode)
        @param newUrl URL to be set (string)
        """
        if not self.__loaded:
            return
        
        command = ChangeBookmarkCommand(self, node, newUrl, False)
        self.__commands.push(command)
    
    def bookmarks(self):
        """
        Public method to get a reference to the root bookmark node.
        
        @return reference to the root bookmark node (BookmarkNode)
        """
        if not self.__loaded:
            self.load()
        
        return self.__bookmarkRootNode
    
    def menu(self):
        """
        Public method to get a reference to the bookmarks menu node.
        
        @return reference to the bookmarks menu node (BookmarkNode)
        """
        if not self.__loaded:
            self.load()
        
        return self.__menu
    
    def toolbar(self):
        """
        Public method to get a reference to the bookmarks toolbar node.
        
        @return reference to the bookmarks toolbar node (BookmarkNode)
        """
        if not self.__loaded:
            self.load()
        
        return self.__toolbar
    
    def bookmarksModel(self):
        """
        Public method to get a reference to the bookmarks model.
        
        @return reference to the bookmarks model (BookmarksModel)
        """
        if self.__bookmarksModel is None:
            self.__bookmarksModel = BookmarksModel(self, self)
        return self.__bookmarksModel
    
    def importBookmarks(self):
        """
        Public method to import bookmarks.
        """
        dlg = BookmarksImportDialog()
        if dlg.exec_() == QDialog.Accepted:
            importRootNode = dlg.getImportedBookmarks()
            if importRootNode is not None:
                self.addBookmark(self.menu(), importRootNode)
    
    def exportBookmarks(self):
        """
        Public method to export the bookmarks.
        """
        fileName, selectedFilter = E5FileDialog.getSaveFileNameAndFilter(
            None,
            self.trUtf8("Export Bookmarks"),
            "eric5_bookmarks.xbel",
            self.trUtf8("XBEL bookmarks (*.xbel);;XBEL bookmarks (*.xml)"))
        if not fileName:
            return
        
        ext = QFileInfo(fileName).suffix()
        if not ext:
            ex = selectedFilter.split("(*")[1].split(")")[0]
            if ex:
                fileName += ex
        
        writer = XbelWriter()
        if not writer.write(fileName, self.__bookmarkRootNode):
            E5MessageBox.critical(None,
                self.trUtf8("Exporting Bookmarks"),
                self.trUtf8("""Error exporting bookmarks to <b>{0}</b>.""")\
                    .format(fileName))
    
    def __convertFromOldBookmarks(self):
        """
        Private method to convert the old bookmarks into the new ones.
        """
        bmNames = Preferences.Prefs.settings.value('Bookmarks/Names')
        bmFiles = Preferences.Prefs.settings.value('Bookmarks/Files')
        
        if bmNames is not None and bmFiles is not None:
            if len(bmNames) == len(bmFiles):
                convertedRootNode = BookmarkNode(BookmarkNode.Folder)
                convertedRootNode.title = self.trUtf8("Converted {0}")\
                    .format(QDate.currentDate().toString(Qt.SystemLocaleShortDate))
                for i in range(len(bmNames)):
                    node = BookmarkNode(BookmarkNode.Bookmark, convertedRootNode)
                    node.title = bmNames[i]
                    url = QUrl(bmFiles[i])
                    if not url.scheme():
                        url.setScheme("file")
                    node.url = url.toString()
                self.addBookmark(self.menu(), convertedRootNode)
                
                Preferences.Prefs.settings.remove('Bookmarks')
    
    def iconChanged(self, url):
        """
        Public slot to update the icon image for an URL.
        
        @param url URL of the icon to update (QUrl or string)
        """
        if isinstance(url, QUrl):
            url = url.toString()
        nodes = self.bookmarksForUrl(url)
        for node in nodes:
            self.bookmarksModel().entryChanged(node)
    
    def bookmarkForUrl(self, url, start=StartRoot):
        """
        Public method to get a bookmark node for a given URL.
        
        @param url URL of the bookmark to search for (QUrl or string)
        @keyparam start indicator for the start of the search
            (StartRoot, StartMenu, StartToolBar)
        @return bookmark node for the given url (BookmarkNode)
        """
        if start == StartMenu:
            startNode = self.__menu
        elif start == StartToolBar:
            startNode = self.__toolbar
        else:
            startNode = self.__bookmarkRootNode
        if startNode is None:
            return None
        
        if isinstance(url, QUrl):
            url = url.toString()
        
        return self.__searchBookmark(url, startNode)
    
    def __searchBookmark(self, url, startNode):
        """
        Private method get a bookmark node for a given URL.
        
        @param url URL of the bookmark to search for (string)
        @param startNode reference to the node to start searching (BookmarkNode)
        @return bookmark node for the given url (BookmarkNode)
        """
        bm = None
        for node in startNode.children():
            if node.type() == BookmarkNode.Folder:
                bm = self.__searchBookmark(url, node)
            elif node.type() == BookmarkNode.Bookmark:
                if node.url == url:
                    bm = node
            if bm is not None:
                return bm
        return None
    
    def bookmarksForUrl(self, url, start=StartRoot):
        """
        Public method to get a list of bookmark nodes for a given URL.
        
        @param url URL of the bookmarks to search for (QUrl or string)
        @keyparam start indicator for the start of the search
            (StartRoot, StartMenu, StartToolBar)
        @return list of bookmark nodes for the given url (list of BookmarkNode)
        """
        if start == StartMenu:
            startNode = self.__menu
        elif start == StartToolBar:
            startNode = self.__toolbar
        else:
            startNode = self.__bookmarkRootNode
        if startNode is None:
            return None
        
        if isinstance(url, QUrl):
            url = url.toString()
        
        return self.__searchBookmarks(url, startNode)
    
    def __searchBookmarks(self, url, startNode):
        """
        Private method get a list of bookmark nodes for a given URL.
        
        @param url URL of the bookmarks to search for (string)
        @param startNode reference to the node to start searching (BookmarkNode)
        @return list of bookmark nodes for the given url (list of BookmarkNode)
        """
        bm = []
        for node in startNode.children():
            if node.type() == BookmarkNode.Folder:
                bm.extend(self.__searchBookmarks(url, node))
            elif node.type() == BookmarkNode.Bookmark:
                if node.url == url:
                    bm.append(node)
        return bm


class RemoveBookmarksCommand(QUndoCommand):
    """
    Class implementing the Remove undo command.
    """
    def __init__(self, bookmarksManager, parent, row):
        """
        Constructor
        
        @param bookmarksManager reference to the bookmarks manager (BookmarksManager)
        @param parent reference to the parent node (BookmarkNode)
        @param row row number of bookmark (integer)
        """
        super().__init__(
            QApplication.translate("BookmarksManager", "Remove Bookmark"))
        
        self._row = row
        self._bookmarksManager = bookmarksManager
        try:
            self._node = parent.children()[row]
        except IndexError:
            self._node = BookmarkNode()
        self._parent = parent
    
    def undo(self):
        """
        Public slot to perform the undo action.
        """
        self._parent.add(self._node, self._row)
        self._bookmarksManager.entryAdded.emit(self._node)
    
    def redo(self):
        """
        Public slot to perform the redo action.
        """
        self._parent.remove(self._node)
        self._bookmarksManager.entryRemoved.emit(self._parent, self._row, self._node)


class InsertBookmarksCommand(RemoveBookmarksCommand):
    """
    Class implementing the Insert undo command.
    """
    def __init__(self, bookmarksManager, parent, node, row):
        """
        Constructor
        
        @param bookmarksManager reference to the bookmarks manager (BookmarksManager)
        @param parent reference to the parent node (BookmarkNode)
        @param node reference to the node to be inserted (BookmarkNode)
        @param row row number of bookmark (integer)
        """
        RemoveBookmarksCommand.__init__(self, bookmarksManager, parent, row)
        self.setText(QApplication.translate("BookmarksManager", "Insert Bookmark"))
        self._node = node
    
    def undo(self):
        """
        Public slot to perform the undo action.
        """
        RemoveBookmarksCommand.redo(self)
    
    def redo(self):
        """
        Public slot to perform the redo action.
        """
        RemoveBookmarksCommand.undo(self)


class ChangeBookmarkCommand(QUndoCommand):
    """
    Class implementing the Insert undo command.
    """
    def __init__(self, bookmarksManager, node, newValue, title):
        """
        Constructor
        
        @param bookmarksManager reference to the bookmarks manager (BookmarksManager)
        @param node reference to the node to be changed (BookmarkNode)
        @param newValue new value to be set (string)
        @param title flag indicating a change of the title (True) or
            the URL (False) (boolean)
        """
        super().__init__()
        
        self._bookmarksManager = bookmarksManager
        self._title = title
        self._newValue = newValue
        self._node = node
        
        if self._title:
            self._oldValue = self._node.title
            self.setText(QApplication.translate("BookmarksManager", "Name Change"))
        else:
            self._oldValue = self._node.url
            self.setText(QApplication.translate("BookmarksManager", "Address Change"))
    
    def undo(self):
        """
        Public slot to perform the undo action.
        """
        if self._title:
            self._node.title = self._oldValue
        else:
            self._node.url = self._oldValue
        self._bookmarksManager.entryChanged.emit(self._node)
    
    def redo(self):
        """
        Public slot to perform the redo action.
        """
        if self._title:
            self._node.title = self._newValue
        else:
            self._node.url = self._newValue
        self._bookmarksManager.entryChanged.emit(self._node)