Plugins/VcsPlugins/vcsGit/GitLogBrowserDialog.py

changeset 6020
baf6da1ae288
child 6048
82ad8ec9548c
diff -r 58ecdaf0b789 -r baf6da1ae288 Plugins/VcsPlugins/vcsGit/GitLogBrowserDialog.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Plugins/VcsPlugins/vcsGit/GitLogBrowserDialog.py	Sun Dec 10 17:42:11 2017 +0100
@@ -0,0 +1,2338 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2014 - 2017 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module implementing a dialog to browse the log history.
+"""
+
+from __future__ import unicode_literals
+try:
+    str = unicode
+except NameError:
+    pass
+
+import os
+import collections
+
+from PyQt5.QtCore import pyqtSlot, qVersion, Qt, QDate, QProcess, QTimer, \
+    QRegExp, QSize, QPoint, QFileInfo
+from PyQt5.QtGui import QCursor, QColor, QPixmap, QPainter, QPen, QIcon, \
+    QTextCursor
+from PyQt5.QtWidgets import QWidget, QDialogButtonBox, QHeaderView, \
+    QTreeWidgetItem, QApplication, QLineEdit, QMenu, QInputDialog, QToolTip
+
+from E5Gui.E5Application import e5App
+from E5Gui import E5MessageBox, E5FileDialog
+
+from .Ui_GitLogBrowserDialog import Ui_GitLogBrowserDialog
+
+from .GitDiffHighlighter import GitDiffHighlighter
+from .GitDiffGenerator import GitDiffGenerator
+from .GitUtilities import strToQByteArray
+
+import UI.PixmapCache
+import Preferences
+import Utilities
+
+COLORNAMES = ["red", "green", "purple", "cyan", "olive", "magenta",
+              "gray", "yellow", "darkred", "darkgreen", "darkblue",
+              "darkcyan", "darkmagenta", "blue"]
+COLORS = [str(QColor(x).name()) for x in COLORNAMES]
+
+
+class GitLogBrowserDialog(QWidget, Ui_GitLogBrowserDialog):
+    """
+    Class implementing a dialog to browse the log history.
+    """
+    IconColumn = 0
+    CommitIdColumn = 1
+    AuthorColumn = 2
+    DateColumn = 3
+    CommitterColumn = 4
+    CommitDateColumn = 5
+    SubjectColumn = 6
+    BranchColumn = 7
+    TagsColumn = 8
+    
+    def __init__(self, vcs, parent=None):
+        """
+        Constructor
+        
+        @param vcs reference to the vcs object
+        @param parent parent widget (QWidget)
+        """
+        super(GitLogBrowserDialog, self).__init__(parent)
+        self.setupUi(self)
+        
+        windowFlags = self.windowFlags()
+        windowFlags |= Qt.WindowContextHelpButtonHint
+        self.setWindowFlags(windowFlags)
+        
+        self.mainSplitter.setSizes([300, 400])
+        self.mainSplitter.setStretchFactor(0, 1)
+        self.mainSplitter.setStretchFactor(1, 2)
+        self.diffSplitter.setStretchFactor(0, 1)
+        self.diffSplitter.setStretchFactor(1, 2)
+        
+        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
+        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
+        
+        self.filesTree.headerItem().setText(self.filesTree.columnCount(), "")
+        self.filesTree.header().setSortIndicator(1, Qt.AscendingOrder)
+        
+        self.upButton.setIcon(UI.PixmapCache.getIcon("1uparrow.png"))
+        self.downButton.setIcon(UI.PixmapCache.getIcon("1downarrow.png"))
+        
+        self.refreshButton = self.buttonBox.addButton(
+            self.tr("&Refresh"), QDialogButtonBox.ActionRole)
+        self.refreshButton.setToolTip(
+            self.tr("Press to refresh the list of commits"))
+        self.refreshButton.setEnabled(False)
+        
+        self.findPrevButton.setIcon(UI.PixmapCache.getIcon("1leftarrow.png"))
+        self.findNextButton.setIcon(UI.PixmapCache.getIcon("1rightarrow.png"))
+        self.__findBackwards = False
+        
+        self.modeComboBox.addItem(self.tr("Find"), "find")
+        self.modeComboBox.addItem(self.tr("Filter"), "filter")
+        
+        self.fieldCombo.addItem(self.tr("Commit ID"), "commitId")
+        self.fieldCombo.addItem(self.tr("Author"), "author")
+        self.fieldCombo.addItem(self.tr("Committer"), "committer")
+        self.fieldCombo.addItem(self.tr("Subject"), "subject")
+        self.fieldCombo.addItem(self.tr("File"), "file")
+        
+        self.__logTreeNormalFont = self.logTree.font()
+        self.__logTreeNormalFont.setBold(False)
+        self.__logTreeBoldFont = self.logTree.font()
+        self.__logTreeBoldFont.setBold(True)
+        
+        font = Preferences.getEditorOtherFonts("MonospacedFont")
+        self.diffEdit.setFontFamily(font.family())
+        self.diffEdit.setFontPointSize(font.pointSize())
+        
+        self.diffHighlighter = GitDiffHighlighter(self.diffEdit.document())
+        self.__diffGenerator = GitDiffGenerator(vcs, self)
+        self.__diffGenerator.finished.connect(self.__generatorFinished)
+        
+        self.vcs = vcs
+        
+        self.__detailsTemplate = self.tr(
+            "<table>"
+            "<tr><td><b>Commit ID</b></td><td>{0}</td></tr>"
+            "<tr><td><b>Date</b></td><td>{1}</td></tr>"
+            "<tr><td><b>Author</b></td><td>{2} &lt;{3}&gt;</td></tr>"
+            "<tr><td><b>Commit Date</b></td><td>{4}</td></tr>"
+            "<tr><td><b>Committer</b></td><td>{5} &lt;{6}&gt;</td></tr>"
+            "{7}"
+            "<tr><td><b>Subject</b></td><td>{8}</td></tr>"
+            "{9}"
+            "</table>"
+        )
+        self.__parentsTemplate = self.tr(
+            "<tr><td><b>Parents</b></td><td>{0}</td></tr>"
+        )
+        self.__childrenTemplate = self.tr(
+            "<tr><td><b>Children</b></td><td>{0}</td></tr>"
+        )
+        self.__branchesTemplate = self.tr(
+            "<tr><td><b>Branches</b></td><td>{0}</td></tr>"
+        )
+        self.__tagsTemplate = self.tr(
+            "<tr><td><b>Tags</b></td><td>{0}</td></tr>"
+        )
+        self.__mesageTemplate = self.tr(
+            "<tr><td><b>Message</b></td><td>{0}</td></tr>"
+        )
+        
+        self.__formatTemplate = (
+            'format:recordstart%n'
+            'commit|%h%n'
+            'parents|%p%n'
+            'author|%an%n'
+            'authormail|%ae%n'
+            'authordate|%ai%n'
+            'committer|%cn%n'
+            'committermail|%ce%n'
+            'committerdate|%ci%n'
+            'refnames|%d%n'
+            'subject|%s%n'
+            'bodystart%n'
+            '%b%n'
+            'bodyend%n'
+        )
+        
+        self.__filename = ""
+        self.__isFile = False
+        self.__selectedCommitIDs = []
+        self.intercept = False
+        
+        self.__initData()
+        
+        self.fromDate.setDisplayFormat("yyyy-MM-dd")
+        self.toDate.setDisplayFormat("yyyy-MM-dd")
+        self.__resetUI()
+        
+        # roles used in the log tree
+        self.__subjectRole = Qt.UserRole
+        self.__messageRole = Qt.UserRole + 1
+        self.__changesRole = Qt.UserRole + 2
+        self.__edgesRole = Qt.UserRole + 3
+        self.__parentsRole = Qt.UserRole + 4
+        self.__branchesRole = Qt.UserRole + 5
+        self.__authorMailRole = Qt.UserRole + 6
+        self.__committerMailRole = Qt.UserRole + 7
+        
+        # roles used in the file tree
+        self.__diffFileLineRole = Qt.UserRole
+        
+        self.process = QProcess()
+        self.process.finished.connect(self.__procFinished)
+        self.process.readyReadStandardOutput.connect(self.__readStdout)
+        self.process.readyReadStandardError.connect(self.__readStderr)
+        
+        self.flags = {
+            'A': self.tr('Added'),
+            'D': self.tr('Deleted'),
+            'M': self.tr('Modified'),
+            'C': self.tr('Copied'),
+            'R': self.tr('Renamed'),
+            'T': self.tr('Type changed'),
+            'U': self.tr('Unmerged'),
+            'X': self.tr('Unknown'),
+        }
+        
+        self.__dotRadius = 8
+        self.__rowHeight = 20
+        
+        self.logTree.setIconSize(
+            QSize(100 * self.__rowHeight, self.__rowHeight))
+        
+        self.detailsEdit.anchorClicked.connect(self.__commitIdClicked)
+        
+        self.__initLogTreeContextMenu()
+        self.__initActionsMenu()
+        
+        self.__finishCallbacks = []
+    
+    def __addFinishCallback(self, callback):
+        """
+        Private method to add a method to be called once the process finished.
+        
+        The callback methods are invoke in a FIFO style and are consumed. If
+        a callback method needs to be called again, it must be added again.
+        
+        @param callback callback method
+        @type function
+        """
+        if callback not in self.__finishCallbacks:
+            self.__finishCallbacks.append(callback)
+    
+    def __initLogTreeContextMenu(self):
+        """
+        Private method to initialize the log tree context menu.
+        """
+        self.__logTreeMenu = QMenu()
+        
+        # commit ID column
+        act = self.__logTreeMenu.addAction(
+            self.tr("Show Commit ID Column"))
+        act.setToolTip(self.tr(
+            "Press to show the commit ID column"))
+        act.setCheckable(True)
+        act.setChecked(self.vcs.getPlugin().getPreferences(
+            "ShowCommitIdColumn"))
+        act.triggered.connect(self.__showCommitIdColumn)
+        
+        # author and date columns
+        act = self.__logTreeMenu.addAction(
+            self.tr("Show Author Columns"))
+        act.setToolTip(self.tr(
+            "Press to show the author columns"))
+        act.setCheckable(True)
+        act.setChecked(self.vcs.getPlugin().getPreferences(
+            "ShowAuthorColumns"))
+        act.triggered.connect(self.__showAuthorColumns)
+        
+        # committer and commit date columns
+        act = self.__logTreeMenu.addAction(
+            self.tr("Show Committer Columns"))
+        act.setToolTip(self.tr(
+            "Press to show the committer columns"))
+        act.setCheckable(True)
+        act.setChecked(self.vcs.getPlugin().getPreferences(
+            "ShowCommitterColumns"))
+        act.triggered.connect(self.__showCommitterColumns)
+        
+        # branches column
+        act = self.__logTreeMenu.addAction(
+            self.tr("Show Branches Column"))
+        act.setToolTip(self.tr(
+            "Press to show the branches column"))
+        act.setCheckable(True)
+        act.setChecked(self.vcs.getPlugin().getPreferences(
+            "ShowBranchesColumn"))
+        act.triggered.connect(self.__showBranchesColumn)
+        
+        # tags column
+        act = self.__logTreeMenu.addAction(
+            self.tr("Show Tags Column"))
+        act.setToolTip(self.tr(
+            "Press to show the Tags column"))
+        act.setCheckable(True)
+        act.setChecked(self.vcs.getPlugin().getPreferences(
+            "ShowTagsColumn"))
+        act.triggered.connect(self.__showTagsColumn)
+        
+        # set column visibility as configured
+        self.__showCommitIdColumn(self.vcs.getPlugin().getPreferences(
+            "ShowCommitIdColumn"))
+        self.__showAuthorColumns(self.vcs.getPlugin().getPreferences(
+            "ShowAuthorColumns"))
+        self.__showCommitterColumns(self.vcs.getPlugin().getPreferences(
+            "ShowCommitterColumns"))
+        self.__showBranchesColumn(self.vcs.getPlugin().getPreferences(
+            "ShowBranchesColumn"))
+        self.__showTagsColumn(self.vcs.getPlugin().getPreferences(
+            "ShowTagsColumn"))
+    
+    def __initActionsMenu(self):
+        """
+        Private method to initialize the actions menu.
+        """
+        self.__actionsMenu = QMenu()
+        self.__actionsMenu.setTearOffEnabled(True)
+        if qVersion() >= "5.1.0":
+            self.__actionsMenu.setToolTipsVisible(True)
+        else:
+            self.__actionsMenu.hovered.connect(self.__actionsMenuHovered)
+        
+        self.__cherryAct = self.__actionsMenu.addAction(
+            self.tr("Copy Commits"), self.__cherryActTriggered)
+        self.__cherryAct.setToolTip(self.tr(
+            "Cherry-pick the selected commits to the current branch"))
+        
+        self.__actionsMenu.addSeparator()
+        
+        self.__tagAct = self.__actionsMenu.addAction(
+            self.tr("Tag"), self.__tagActTriggered)
+        self.__tagAct.setToolTip(self.tr("Tag the selected commit"))
+        
+        self.__branchAct = self.__actionsMenu.addAction(
+            self.tr("Branch"), self.__branchActTriggered)
+        self.__branchAct.setToolTip(self.tr(
+            "Create a new branch at the selected commit."))
+        self.__branchSwitchAct = self.__actionsMenu.addAction(
+            self.tr("Branch && Switch"), self.__branchSwitchActTriggered)
+        self.__branchSwitchAct.setToolTip(self.tr(
+            "Create a new branch at the selected commit and switch"
+            " the work tree to it."))
+        
+        self.__switchAct = self.__actionsMenu.addAction(
+            self.tr("Switch"), self.__switchActTriggered)
+        self.__switchAct.setToolTip(self.tr(
+            "Switch the working directory to the selected commit"))
+        self.__actionsMenu.addSeparator()
+        
+        self.__shortlogAct = self.__actionsMenu.addAction(
+            self.tr("Show Short Log"), self.__shortlogActTriggered)
+        self.__shortlogAct.setToolTip(self.tr(
+            "Show a dialog with a log output for release notes"))
+        
+        self.__describeAct = self.__actionsMenu.addAction(
+            self.tr("Describe"), self.__describeActTriggered)
+        self.__describeAct.setToolTip(self.tr(
+            "Show the most recent tag reachable from a commit"))
+        
+        self.actionsButton.setIcon(
+            UI.PixmapCache.getIcon("actionsToolButton.png"))
+        self.actionsButton.setMenu(self.__actionsMenu)
+    
+    def __actionsMenuHovered(self, action):
+        """
+        Private slot to show the tooltip for an action menu entry.
+        
+        @param action action to show tooltip for
+        @type QAction
+        """
+        QToolTip.showText(
+            QCursor.pos(), action.toolTip(),
+            self.__actionsMenu, self.__actionsMenu.actionGeometry(action))
+    
+    def __initData(self):
+        """
+        Private method to (re-)initialize some data.
+        """
+        self.__maxDate = QDate()
+        self.__minDate = QDate()
+        self.__filterLogsEnabled = True
+        
+        self.buf = []        # buffer for stdout
+        self.diff = None
+        self.__started = False
+        self.__skipEntries = 0
+        self.projectMode = False
+        
+        # attributes to store log graph data
+        self.__commitIds = []
+        self.__commitColors = {}
+        self.__commitColor = 0
+        
+        self.__projectRevision = ""
+        
+        self.__childrenInfo = collections.defaultdict(list)
+    
+    def closeEvent(self, e):
+        """
+        Protected slot implementing a close event handler.
+        
+        @param e close event (QCloseEvent)
+        """
+        if self.process is not None and \
+           self.process.state() != QProcess.NotRunning:
+            self.process.terminate()
+            QTimer.singleShot(2000, self.process.kill)
+            self.process.waitForFinished(3000)
+        
+        self.vcs.getPlugin().setPreferences(
+            "LogBrowserGeometry", self.saveGeometry())
+        self.vcs.getPlugin().setPreferences(
+            "LogBrowserSplitterStates", [
+                self.mainSplitter.saveState(),
+                self.detailsSplitter.saveState(),
+                self.diffSplitter.saveState(),
+            ]
+        )
+        
+        e.accept()
+    
+    def show(self):
+        """
+        Public slot to show the dialog.
+        """
+        self.__reloadGeometry()
+        self.__restoreSplitterStates()
+        self.__resetUI()
+        
+        super(GitLogBrowserDialog, self).show()
+    
+    def __reloadGeometry(self):
+        """
+        Private method to restore the geometry.
+        """
+        geom = self.vcs.getPlugin().getPreferences("LogBrowserGeometry")
+        if geom.isEmpty():
+            s = QSize(1000, 800)
+            self.resize(s)
+        else:
+            self.restoreGeometry(geom)
+    
+    def __restoreSplitterStates(self):
+        """
+        Private method to restore the state of the various splitters.
+        """
+        states = self.vcs.getPlugin().getPreferences(
+            "LogBrowserSplitterStates")
+        if len(states) == 3:
+            # we have three splitters
+            self.mainSplitter.restoreState(states[0])
+            self.detailsSplitter.restoreState(states[1])
+            self.diffSplitter.restoreState(states[2])
+    
+    def __resetUI(self):
+        """
+        Private method to reset the user interface.
+        """
+        self.fromDate.setDate(QDate.currentDate())
+        self.toDate.setDate(QDate.currentDate())
+        self.fieldCombo.setCurrentIndex(self.fieldCombo.findData("subject"))
+        self.limitSpinBox.setValue(self.vcs.getPlugin().getPreferences(
+            "LogLimit"))
+        self.stopCheckBox.setChecked(self.vcs.getPlugin().getPreferences(
+            "StopLogOnCopy"))
+        
+        self.logTree.clear()
+    
+    def __resizeColumnsLog(self):
+        """
+        Private method to resize the log tree columns.
+        """
+        self.logTree.header().resizeSections(QHeaderView.ResizeToContents)
+        self.logTree.header().setStretchLastSection(True)
+    
+    def __resizeColumnsFiles(self):
+        """
+        Private method to resize the changed files tree columns.
+        """
+        self.filesTree.header().resizeSections(QHeaderView.ResizeToContents)
+        self.filesTree.header().setStretchLastSection(True)
+    
+    def __resortFiles(self):
+        """
+        Private method to resort the changed files tree.
+        """
+        self.filesTree.setSortingEnabled(True)
+        self.filesTree.sortItems(1, Qt.AscendingOrder)
+        self.filesTree.setSortingEnabled(False)
+    
+    def __getColor(self, n):
+        """
+        Private method to get the (rotating) name of the color given an index.
+        
+        @param n color index (integer)
+        @return color name (string)
+        """
+        return COLORS[n % len(COLORS)]
+    
+    def __generateEdges(self, commitId, parents):
+        """
+        Private method to generate edge info for the give data.
+        
+        @param commitId commit id to calculate edge info for (string)
+        @param parents list of parent commits (list of strings)
+        @return tuple containing the column and color index for
+            the given node and a list of tuples indicating the edges
+            between the given node and its parents
+            (integer, integer, [(integer, integer, integer), ...])
+        """
+        if commitId not in self.__commitIds:
+            # new head
+            self.__commitIds.append(commitId)
+            self.__commitColors[commitId] = self.__commitColor
+            self.__commitColor += 1
+        
+        col = self.__commitIds.index(commitId)
+        color = self.__commitColors.pop(commitId)
+        nextCommitIds = self.__commitIds[:]
+        
+        # add parents to next
+        addparents = [p for p in parents if p not in nextCommitIds]
+        nextCommitIds[col:col + 1] = addparents
+        
+        # set colors for the parents
+        for i, p in enumerate(addparents):
+            if not i:
+                self.__commitColors[p] = color
+            else:
+                self.__commitColors[p] = self.__commitColor
+                self.__commitColor += 1
+        
+        # add edges to the graph
+        edges = []
+        if parents:
+            for ecol, ecommitId in enumerate(self.__commitIds):
+                if ecommitId in nextCommitIds:
+                    edges.append(
+                        (ecol, nextCommitIds.index(ecommitId),
+                         self.__commitColors[ecommitId]))
+                elif ecommitId == commitId:
+                    for p in parents:
+                        edges.append(
+                            (ecol, nextCommitIds.index(p),
+                             self.__commitColors[p]))
+        
+        self.__commitIds = nextCommitIds
+        return col, color, edges
+    
+    def __generateIcon(self, column, color, bottomedges, topedges, dotColor,
+                       currentCommit):
+        """
+        Private method to generate an icon containing the revision tree for the
+        given data.
+        
+        @param column column index of the revision (integer)
+        @param color color of the node (integer)
+        @param bottomedges list of edges for the bottom of the node
+            (list of tuples of three integers)
+        @param topedges list of edges for the top of the node
+            (list of tuples of three integers)
+        @param dotColor color to be used for the dot (QColor)
+        @param currentCommit flag indicating to draw the icon for the
+            current commit (boolean)
+        @return icon for the node (QIcon)
+        """
+        def col2x(col, radius):
+            """
+            Local function to calculate a x-position for a column.
+            
+            @param col column number (integer)
+            @param radius radius of the indicator circle (integer)
+            """
+            return int(1.2 * radius) * col + radius // 2 + 3
+        
+        radius = self.__dotRadius
+        w = len(bottomedges) * radius + 20
+        h = self.__rowHeight
+        
+        dot_x = col2x(column, radius) - radius // 2
+        dot_y = h // 2
+        
+        pix = QPixmap(w, h)
+        pix.fill(QColor(0, 0, 0, 0))
+        painter = QPainter(pix)
+        painter.setRenderHint(QPainter.Antialiasing)
+        
+        pen = QPen(Qt.blue)
+        pen.setWidth(2)
+        painter.setPen(pen)
+        
+        lpen = QPen(pen)
+        lpen.setColor(Qt.black)
+        painter.setPen(lpen)
+        
+        # draw the revision history lines
+        for y1, y2, lines in ((0, h, bottomedges),
+                              (-h, 0, topedges)):
+            if lines:
+                for start, end, ecolor in lines:
+                    lpen = QPen(pen)
+                    lpen.setColor(QColor(self.__getColor(ecolor)))
+                    lpen.setWidth(2)
+                    painter.setPen(lpen)
+                    x1 = col2x(start, radius)
+                    x2 = col2x(end, radius)
+                    painter.drawLine(x1, dot_y + y1, x2, dot_y + y2)
+        
+        penradius = 1
+        pencolor = Qt.black
+        
+        dot_y = (h // 2) - radius // 2
+        
+        # draw a dot for the revision
+        if currentCommit:
+            # enlarge dot for the current revision
+            delta = 2
+            radius += 2 * delta
+            dot_y -= delta
+            dot_x -= delta
+        painter.setBrush(dotColor)
+        pen = QPen(pencolor)
+        pen.setWidth(penradius)
+        painter.setPen(pen)
+        painter.drawEllipse(dot_x, dot_y, radius, radius)
+        painter.end()
+        return QIcon(pix)
+    
+    def __identifyProject(self):
+        """
+        Private method to determine the revision of the project directory.
+        """
+        errMsg = ""
+        
+        args = self.vcs.initCommand("show")
+        args.append("--abbrev={0}".format(
+            self.vcs.getPlugin().getPreferences("CommitIdLength")))
+        args.append("--format=%h")
+        args.append("--no-patch")
+        args.append("HEAD")
+        
+        output = ""
+        process = QProcess()
+        process.setWorkingDirectory(self.repodir)
+        process.start('git', args)
+        procStarted = process.waitForStarted(5000)
+        if procStarted:
+            finished = process.waitForFinished(30000)
+            if finished and process.exitCode() == 0:
+                output = str(process.readAllStandardOutput(),
+                             Preferences.getSystem("IOEncoding"),
+                             'replace')
+            else:
+                if not finished:
+                    errMsg = self.tr(
+                        "The git process did not finish within 30s.")
+        else:
+            errMsg = self.tr("Could not start the git executable.")
+        
+        if errMsg:
+            E5MessageBox.critical(
+                self,
+                self.tr("Git Error"),
+                errMsg)
+        
+        if output:
+            self.__projectRevision = output.strip()
+    
+    def __generateLogItem(self, author, date, committer, commitDate, subject,
+                          message, commitId, changedPaths, parents, refnames,
+                          authorMail, committerMail):
+        """
+        Private method to generate a log tree entry.
+        
+        @param author author info (string)
+        @param date date info (string)
+        @param committer committer info (string)
+        @param commitDate commit date info (string)
+        @param subject subject of the log entry (string)
+        @param message text of the log message (list of strings)
+        @param commitId commit id info (string)
+        @param changedPaths list of dictionary objects containing
+            info about the changed files/directories
+        @param parents list of parent revisions (list of integers)
+        @param refnames tags and branches of the commit (string)
+        @param authorMail author's email address (string)
+        @param committerMail committer's email address (string)
+        @return reference to the generated item (QTreeWidgetItem)
+        """
+        branches = []
+        allBranches = []
+        tags = []
+        names = refnames.strip()[1:-1].split(",")
+        for name in names:
+            name = name.strip()
+            if name:
+                if "HEAD" in name:
+                    tags.append(name)
+                elif name.startswith("tag: "):
+                    tags.append(name.split()[1])
+                else:
+                    if "/" not in name:
+                        branches.append(name)
+                    elif "refs/bisect/" in name:
+                        bname = name.replace("refs/", "").split("-", 1)[0]
+                        branches.append(bname)
+                    else:
+                        branches.append(name)
+                    allBranches.append(name)
+        
+        logMessageColumnWidth = self.vcs.getPlugin().getPreferences(
+            "LogSubjectColumnWidth")
+        msgtxt = subject
+        if logMessageColumnWidth and len(msgtxt) > logMessageColumnWidth:
+            msgtxt = "{0}...".format(msgtxt[:logMessageColumnWidth])
+        columnLabels = [
+            "",
+            commitId,
+            author,
+            date.rsplit(None, 1)[0].rsplit(":", 1)[0],
+            committer,
+            commitDate.rsplit(None, 1)[0].rsplit(":", 1)[0],
+            msgtxt,
+            ", ".join(branches),
+            ", ".join(tags),
+        ]
+        itm = QTreeWidgetItem(self.logTree, columnLabels)
+        
+        parents = [p.strip() for p in parents.split()]
+        column, color, edges = self.__generateEdges(commitId, parents)
+        
+        itm.setData(0, self.__subjectRole, subject)
+        itm.setData(0, self.__messageRole, message)
+        itm.setData(0, self.__changesRole, changedPaths)
+        itm.setData(0, self.__edgesRole, edges)
+        itm.setData(0, self.__branchesRole, allBranches)
+        itm.setData(0, self.__authorMailRole, authorMail)
+        itm.setData(0, self.__committerMailRole, committerMail)
+        if not parents:
+            itm.setData(0, self.__parentsRole, [])
+        else:
+            itm.setData(0, self.__parentsRole, parents)
+            for parent in parents:
+                self.__childrenInfo[parent].append(commitId)
+        
+        if self.logTree.topLevelItemCount() > 1:
+            topedges = \
+                self.logTree.topLevelItem(
+                    self.logTree.indexOfTopLevelItem(itm) - 1)\
+                .data(0, self.__edgesRole)
+        else:
+            topedges = None
+        
+        icon = self.__generateIcon(column, color, edges, topedges,
+                                   QColor("blue"),
+                                   commitId == self.__projectRevision)
+        itm.setIcon(0, icon)
+        
+        return itm
+    
+    def __generateFileItem(self, action, path, copyfrom, additions, deletions):
+        """
+        Private method to generate a changed files tree entry.
+        
+        @param action indicator for the change action ("A", "C", "D", "M",
+            "R", "T", "U", "X")
+        @param path path of the file in the repository (string)
+        @param copyfrom path the file was copied from (string)
+        @param additions number of added lines (int)
+        @param deletions number of deleted lines (int)
+        @return reference to the generated item (QTreeWidgetItem)
+        """
+        if len(action) > 1:
+            # includes confidence level
+            confidence = int(action[1:])
+            actionTxt = self.tr("{0} ({1}%)", "action, confidence").format(
+                self.flags[action[0]], confidence)
+        else:
+            actionTxt = self.flags[action]
+        itm = QTreeWidgetItem(self.filesTree, [
+            actionTxt,
+            path,
+            str(additions),
+            str(deletions),
+            copyfrom,
+        ])
+        
+        itm.setTextAlignment(2, Qt.AlignRight)
+        itm.setTextAlignment(3, Qt.AlignRight)
+        
+        return itm
+    
+    def __getLogEntries(self, skip=0, noEntries=0):
+        """
+        Private method to retrieve log entries from the repository.
+        
+        @param skip number of log entries to skip (integer)
+        @keyparam noEntries number of entries to get (0 = default) (int)
+        """
+        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
+        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(True)
+        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
+        QApplication.processEvents()
+        
+        QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
+        QApplication.processEvents()
+        
+        self.buf = []
+        self.cancelled = False
+        self.errors.clear()
+        self.intercept = False
+        
+        if noEntries == 0:
+            noEntries = self.limitSpinBox.value()
+        
+        args = self.vcs.initCommand("log")
+        args.append('--max-count={0}'.format(noEntries))
+        args.append('--numstat')
+        args.append('--abbrev={0}'.format(
+            self.vcs.getPlugin().getPreferences("CommitIdLength")))
+        if self.vcs.getPlugin().getPreferences("FindCopiesHarder"):
+            args.append('--find-copies-harder')
+        args.append('--format={0}'.format(self.__formatTemplate))
+        args.append('--full-history')
+        args.append('--all')
+        args.append('--skip={0}'.format(skip))
+        if not self.projectMode:
+            if not self.stopCheckBox.isChecked():
+                args.append('--follow')
+            args.append('--')
+            args.append(self.__filename)
+        
+        self.process.kill()
+        
+        self.process.setWorkingDirectory(self.repodir)
+        
+        self.process.start('git', args)
+        procStarted = self.process.waitForStarted(5000)
+        if not procStarted:
+            self.inputGroup.setEnabled(False)
+            self.inputGroup.hide()
+            E5MessageBox.critical(
+                self,
+                self.tr('Process Generation Error'),
+                self.tr(
+                    'The process {0} could not be started. '
+                    'Ensure, that it is in the search path.'
+                ).format('git'))
+    
+    def start(self, fn, isFile=False, noEntries=0):
+        """
+        Public slot to start the git log command.
+        
+        @param fn filename to show the log for (string)
+        @keyparam isFile flag indicating log for a file is to be shown
+            (boolean)
+        @keyparam noEntries number of entries to get (0 = default) (int)
+        """
+        self.__isFile = isFile
+        
+        self.sbsSelectLabel.clear()
+        
+        self.errorGroup.hide()
+        QApplication.processEvents()
+        
+        self.__initData()
+        
+        self.__filename = fn
+        self.dname, self.fname = self.vcs.splitPath(fn)
+        
+        # find the root of the repo
+        self.repodir = self.dname
+        while not os.path.isdir(os.path.join(self.repodir, self.vcs.adminDir)):
+            self.repodir = os.path.dirname(self.repodir)
+            if os.path.splitdrive(self.repodir)[1] == os.sep:
+                return
+        
+        self.projectMode = (self.fname == "." and self.dname == self.repodir)
+        self.stopCheckBox.setDisabled(self.projectMode or self.fname == ".")
+        self.activateWindow()
+        self.raise_()
+        
+        self.logTree.clear()
+        self.__started = True
+        self.__identifyProject()
+        self.__getLogEntries(noEntries=noEntries)
+    
+    def __procFinished(self, exitCode, exitStatus):
+        """
+        Private slot connected to the finished signal.
+        
+        @param exitCode exit code of the process (integer)
+        @param exitStatus exit status of the process (QProcess.ExitStatus)
+        """
+        self.__processBuffer()
+        self.__finish()
+    
+    def __finish(self):
+        """
+        Private slot called when the process finished or the user pressed
+        the button.
+        """
+        if self.process is not None and \
+           self.process.state() != QProcess.NotRunning:
+            self.process.terminate()
+            QTimer.singleShot(2000, self.process.kill)
+            self.process.waitForFinished(3000)
+        
+        QApplication.restoreOverrideCursor()
+        
+        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
+        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
+        self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
+        
+        self.inputGroup.setEnabled(False)
+        self.inputGroup.hide()
+        self.refreshButton.setEnabled(True)
+        
+        while self.__finishCallbacks:
+            self.__finishCallbacks.pop(0)()
+    
+    def __processBufferItem(self, logEntry):
+        """
+        Private method to process a log entry.
+        
+        @param logEntry dictionary as generated by __processBuffer
+        """
+        self.__generateLogItem(
+            logEntry["author"], logEntry["authordate"],
+            logEntry["committer"], logEntry["committerdate"],
+            logEntry["subject"], logEntry["body"],
+            logEntry["commit"], logEntry["changed_files"],
+            logEntry["parents"], logEntry["refnames"],
+            logEntry["authormail"], logEntry["committermail"]
+        )
+        for date in [logEntry["authordate"], logEntry["committerdate"]]:
+            dt = QDate.fromString(date, Qt.ISODate)
+            if not self.__maxDate.isValid() and \
+               not self.__minDate.isValid():
+                self.__maxDate = dt
+                self.__minDate = dt
+            else:
+                if self.__maxDate < dt:
+                    self.__maxDate = dt
+                if self.__minDate > dt:
+                    self.__minDate = dt
+    
+    def __processBuffer(self):
+        """
+        Private method to process the buffered output of the git log command.
+        """
+        noEntries = 0
+        logEntry = {"changed_files": []}
+        descriptionBody = False
+        
+        for line in self.buf:
+            line = line.rstrip()
+            if line == "recordstart":
+                if len(logEntry) > 1:
+                    self.__processBufferItem(logEntry)
+                    noEntries += 1
+                logEntry = {"changed_files": []}
+                descriptionBody = False
+                fileChanges = False
+                body = []
+            elif line == "bodystart":
+                descriptionBody = True
+            elif line == "bodyend":
+                if bool(body) and not bool(body[-1]):
+                    body.pop()
+                logEntry["body"] = body
+                descriptionBody = False
+                fileChanges = True
+            elif descriptionBody:
+                body.append(line)
+            elif fileChanges:
+                if line:
+                    if "changed_files" not in logEntry:
+                        logEntry["changed_files"] = []
+                    changeInfo = line.strip().split("\t")
+                    if "=>" in changeInfo[2]:
+                        # copy/move
+                        if "{" in changeInfo[2] and "}" in changeInfo[2]:
+                            # change info of the form
+                            # test/{pack1 => pack2}/file1.py
+                            head, tail = changeInfo[2].split("{", 1)
+                            middle, tail = tail.split("}", 1)
+                            middleSrc, middleDst = middle.split("=>")
+                            src = head + middleSrc.strip() + tail
+                            dst = head + middleDst.strip() + tail
+                        else:
+                            src, dst = changeInfo[2].split("=>")
+                        logEntry["changed_files"].append({
+                            "action": "C",
+                            "added": changeInfo[0].strip(),
+                            "deleted": changeInfo[1].strip(),
+                            "path": dst.strip(),
+                            "copyfrom": src.strip(),
+                        })
+                    else:
+                        logEntry["changed_files"].append({
+                            "action": "M",
+                            "added": changeInfo[0].strip(),
+                            "deleted": changeInfo[1].strip(),
+                            "path": changeInfo[2].strip(),
+                            "copyfrom": "",
+                        })
+            else:
+                try:
+                    key, value = line.split("|", 1)
+                except ValueError:
+                    key = ""
+                    value = line
+                if key in ("commit", "parents", "author", "authormail",
+                           "authordate", "committer", "committermail",
+                           "committerdate", "refnames", "subject"):
+                    logEntry[key] = value.strip()
+        if len(logEntry) > 1:
+            self.__processBufferItem(logEntry)
+            noEntries += 1
+        
+        self.__resizeColumnsLog()
+        
+        if self.__started:
+            if self.__selectedCommitIDs:
+                self.logTree.setCurrentItem(self.logTree.findItems(
+                    self.__selectedCommitIDs[0], Qt.MatchExactly,
+                    self.CommitIdColumn)[0])
+            else:
+                self.logTree.setCurrentItem(self.logTree.topLevelItem(0))
+            self.__started = False
+        
+        self.__skipEntries += noEntries
+        if noEntries < self.limitSpinBox.value() and not self.cancelled:
+            self.nextButton.setEnabled(False)
+            self.limitSpinBox.setEnabled(False)
+        else:
+            self.nextButton.setEnabled(True)
+            self.limitSpinBox.setEnabled(True)
+        
+        # update the log filters
+        self.__filterLogsEnabled = False
+        self.fromDate.setMinimumDate(self.__minDate)
+        self.fromDate.setMaximumDate(self.__maxDate)
+        self.fromDate.setDate(self.__minDate)
+        self.toDate.setMinimumDate(self.__minDate)
+        self.toDate.setMaximumDate(self.__maxDate)
+        self.toDate.setDate(self.__maxDate)
+        
+        self.__filterLogsEnabled = True
+        if self.__actionMode() == "filter":
+            self.__filterLogs()
+        
+        self.__updateToolMenuActions()
+        
+        # restore selected items
+        if self.__selectedCommitIDs:
+            for commitID in self.__selectedCommitIDs:
+                items = self.logTree.findItems(
+                    commitID, Qt.MatchExactly, self.CommitIdColumn)
+                if items:
+                    items[0].setSelected(True)
+            self.__selectedCommitIDs = []
+    
+    def __readStdout(self):
+        """
+        Private slot to handle the readyReadStandardOutput signal.
+        
+        It reads the output of the process and inserts it into a buffer.
+        """
+        self.process.setReadChannel(QProcess.StandardOutput)
+        
+        while self.process.canReadLine():
+            line = str(self.process.readLine(),
+                       Preferences.getSystem("IOEncoding"),
+                       'replace')
+            self.buf.append(line)
+    
+    def __readStderr(self):
+        """
+        Private slot to handle the readyReadStandardError signal.
+        
+        It reads the error output of the process and inserts it into the
+        error pane.
+        """
+        if self.process is not None:
+            s = str(self.process.readAllStandardError(),
+                    Preferences.getSystem("IOEncoding"),
+                    'replace')
+            self.__showError(s)
+    
+    def __showError(self, out):
+        """
+        Private slot to show some error.
+        
+        @param out error to be shown (string)
+        """
+        self.errorGroup.show()
+        self.errors.insertPlainText(out)
+        self.errors.ensureCursorVisible()
+        
+        # show input in case the process asked for some input
+        self.inputGroup.setEnabled(True)
+        self.inputGroup.show()
+    
+    def on_buttonBox_clicked(self, button):
+        """
+        Private slot called by a button of the button box clicked.
+        
+        @param button button that was clicked (QAbstractButton)
+        """
+        if button == self.buttonBox.button(QDialogButtonBox.Close):
+            self.close()
+        elif button == self.buttonBox.button(QDialogButtonBox.Cancel):
+            self.cancelled = True
+            self.__finish()
+        elif button == self.refreshButton:
+            self.on_refreshButton_clicked()
+    
+    @pyqtSlot()
+    def on_refreshButton_clicked(self):
+        """
+        Private slot to refresh the log.
+        """
+        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
+        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(True)
+        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
+        
+        self.refreshButton.setEnabled(False)
+        
+        # save the selected items commit IDs
+        self.__selectedCommitIDs = []
+        for item in self.logTree.selectedItems():
+            self.__selectedCommitIDs.append(item.text(self.CommitIdColumn))
+        
+        self.start(self.__filename, isFile=self.__isFile,
+                   noEntries=self.logTree.topLevelItemCount())
+    
+    def on_passwordCheckBox_toggled(self, isOn):
+        """
+        Private slot to handle the password checkbox toggled.
+        
+        @param isOn flag indicating the status of the check box (boolean)
+        """
+        if isOn:
+            self.input.setEchoMode(QLineEdit.Password)
+        else:
+            self.input.setEchoMode(QLineEdit.Normal)
+    
+    @pyqtSlot()
+    def on_sendButton_clicked(self):
+        """
+        Private slot to send the input to the git process.
+        """
+        inputTxt = self.input.text()
+        inputTxt += os.linesep
+        
+        if self.passwordCheckBox.isChecked():
+            self.errors.insertPlainText(os.linesep)
+            self.errors.ensureCursorVisible()
+        else:
+            self.errors.insertPlainText(inputTxt)
+            self.errors.ensureCursorVisible()
+        self.errorGroup.show()
+        
+        self.process.write(strToQByteArray(inputTxt))
+        
+        self.passwordCheckBox.setChecked(False)
+        self.input.clear()
+    
+    def on_input_returnPressed(self):
+        """
+        Private slot to handle the press of the return key in the input field.
+        """
+        self.intercept = True
+        self.on_sendButton_clicked()
+    
+    def keyPressEvent(self, evt):
+        """
+        Protected slot to handle a key press event.
+        
+        @param evt the key press event (QKeyEvent)
+        """
+        if self.intercept:
+            self.intercept = False
+            evt.accept()
+            return
+        super(GitLogBrowserDialog, self).keyPressEvent(evt)
+    
+    def __prepareFieldSearch(self):
+        """
+        Private slot to prepare the filed search data.
+        
+        @return tuple of field index, search expression and flag indicating
+            that the field index is a data role (integer, string, boolean)
+        """
+        indexIsRole = False
+        txt = self.fieldCombo.itemData(self.fieldCombo.currentIndex())
+        if txt == "author":
+            fieldIndex = self.AuthorColumn
+            searchRx = QRegExp(self.rxEdit.text(), Qt.CaseInsensitive)
+        elif txt == "committer":
+            fieldIndex = self.CommitterColumn
+            searchRx = QRegExp(self.rxEdit.text(), Qt.CaseInsensitive)
+        elif txt == "commitId":
+            fieldIndex = self.CommitIdColumn
+            txt = self.rxEdit.text()
+            if txt.startswith("^"):
+                searchRx = QRegExp("^\s*{0}".format(txt[1:]),
+                                   Qt.CaseInsensitive)
+            else:
+                searchRx = QRegExp(txt, Qt.CaseInsensitive)
+        elif txt == "file":
+            fieldIndex = self.__changesRole
+            searchRx = QRegExp(self.rxEdit.text(), Qt.CaseInsensitive)
+            indexIsRole = True
+        else:
+            fieldIndex = self.__subjectRole
+            searchRx = QRegExp(self.rxEdit.text(), Qt.CaseInsensitive)
+            indexIsRole = True
+        
+        return fieldIndex, searchRx, indexIsRole
+    
+    def __filterLogs(self):
+        """
+        Private method to filter the log entries.
+        """
+        if self.__filterLogsEnabled:
+            from_ = self.fromDate.date().toString("yyyy-MM-dd")
+            to_ = self.toDate.date().addDays(1).toString("yyyy-MM-dd")
+            fieldIndex, searchRx, indexIsRole = self.__prepareFieldSearch()
+            
+            visibleItemCount = self.logTree.topLevelItemCount()
+            currentItem = self.logTree.currentItem()
+            for topIndex in range(self.logTree.topLevelItemCount()):
+                topItem = self.logTree.topLevelItem(topIndex)
+                if indexIsRole:
+                    if fieldIndex == self.__changesRole:
+                        changes = topItem.data(0, self.__changesRole)
+                        txt = "\n".join(
+                            [c["path"] for c in changes] +
+                            [c["copyfrom"] for c in changes]
+                        )
+                    else:
+                        # Filter based on complete subject text
+                        txt = topItem.data(0, self.__subjectRole)
+                else:
+                    txt = topItem.text(fieldIndex)
+                if topItem.text(self.DateColumn) <= to_ and \
+                   topItem.text(self.DateColumn) >= from_ and \
+                   searchRx.indexIn(txt) > -1:
+                    topItem.setHidden(False)
+                    if topItem is currentItem:
+                        self.on_logTree_currentItemChanged(topItem, None)
+                else:
+                    topItem.setHidden(True)
+                    if topItem is currentItem:
+                        self.filesTree.clear()
+                    visibleItemCount -= 1
+            self.logTree.header().setSectionHidden(
+                self.IconColumn,
+                visibleItemCount != self.logTree.topLevelItemCount())
+    
+    def __updateSbsSelectLabel(self):
+        """
+        Private slot to update the enabled status of the diff buttons.
+        """
+        self.sbsSelectLabel.clear()
+        if self.__isFile:
+            selectedItems = self.logTree.selectedItems()
+            if len(selectedItems) == 1:
+                currentItem = selectedItems[0]
+                commit2 = currentItem.text(self.CommitIdColumn).strip()
+                parents = currentItem.data(0, self.__parentsRole)
+                if parents:
+                    parentLinks = []
+                    for index in range(len(parents)):
+                        parentLinks.append(
+                            '<a href="sbsdiff:{0}_{1}">&nbsp;{2}&nbsp;</a>'
+                            .format(parents[index], commit2, index + 1))
+                    self.sbsSelectLabel.setText(
+                        self.tr('Side-by-Side Diff to Parent {0}').format(
+                            " ".join(parentLinks)))
+            elif len(selectedItems) == 2:
+                commit2 = selectedItems[0].text(self.CommitIdColumn)
+                commit1 = selectedItems[1].text(self.CommitIdColumn)
+                index2 = self.logTree.indexOfTopLevelItem(selectedItems[0])
+                index1 = self.logTree.indexOfTopLevelItem(selectedItems[1])
+                
+                if index2 < index1:
+                    # swap to always compare old to new
+                    commit1, commit2 = commit2, commit1
+                self.sbsSelectLabel.setText(self.tr(
+                    '<a href="sbsdiff:{0}_{1}">Side-by-Side Compare</a>')
+                    .format(commit1, commit2))
+    
+    def __updateToolMenuActions(self):
+        """
+        Private slot to update the status of the tool menu actions and
+        the tool menu button.
+        """
+        if self.projectMode:
+            selectCount = len(self.logTree.selectedItems())
+            self.__cherryAct.setEnabled(selectCount > 0)
+            self.__describeAct.setEnabled(selectCount > 0)
+            self.__tagAct.setEnabled(selectCount == 1)
+            self.__switchAct.setEnabled(selectCount == 1)
+            self.__branchAct.setEnabled(selectCount == 1)
+            self.__branchSwitchAct.setEnabled(selectCount == 1)
+            self.__shortlogAct.setEnabled(selectCount == 1)
+            
+            self.actionsButton.setEnabled(True)
+        else:
+            self.actionsButton.setEnabled(False)
+    
+    def __updateDetailsAndFiles(self):
+        """
+        Private slot to update the details and file changes panes.
+        """
+        self.detailsEdit.clear()
+        self.filesTree.clear()
+        self.__diffUpdatesFiles = False
+        
+        selectedItems = self.logTree.selectedItems()
+        if len(selectedItems) == 1:
+            self.detailsEdit.setHtml(
+                self.__generateDetailsTableText(selectedItems[0]))
+            self.__updateFilesTree(self.filesTree, selectedItems[0])
+            self.__resizeColumnsFiles()
+            self.__resortFiles()
+            if self.filesTree.topLevelItemCount() == 0:
+                self.__diffUpdatesFiles = True
+                # give diff a chance to update the files list
+        elif len(selectedItems) == 2:
+            self.__diffUpdatesFiles = True
+            index1 = self.logTree.indexOfTopLevelItem(selectedItems[0])
+            index2 = self.logTree.indexOfTopLevelItem(selectedItems[1])
+            if index1 > index2:
+                # Swap the entries
+                selectedItems[0], selectedItems[1] = \
+                    selectedItems[1], selectedItems[0]
+            html = "{0}<hr/>{1}".format(
+                self.__generateDetailsTableText(selectedItems[0]),
+                self.__generateDetailsTableText(selectedItems[1]),
+            )
+            self.detailsEdit.setHtml(html)
+            # self.filesTree is updated by the diff
+    
+    def __generateDetailsTableText(self, itm):
+        """
+        Private method to generate an HTML table with the details of the given
+        changeset.
+        
+        @param itm reference to the item the table should be based on
+        @type QTreeWidgetItem
+        @return HTML table containing details
+        @rtype str
+        """
+        if itm is not None:
+            commitId = itm.text(self.CommitIdColumn)
+            
+            parentLinks = []
+            for parent in [str(x) for x in itm.data(0, self.__parentsRole)]:
+                parentLinks.append('<a href="rev:{0}">{0}</a>'.format(parent))
+            if parentLinks:
+                parentsStr = self.__parentsTemplate.format(
+                    ", ".join(parentLinks))
+            else:
+                parentsStr = ""
+            
+            childLinks = []
+            for child in [str(x) for x in self.__childrenInfo[commitId]]:
+                childLinks.append('<a href="rev:{0}">{0}</a>'.format(child))
+            if childLinks:
+                childrenStr = self.__childrenTemplate.format(
+                    ", ".join(childLinks))
+            else:
+                childrenStr = ""
+            
+            branchLinks = []
+            for branch, branchHead in self.__getBranchesForCommit(commitId):
+                branchLinks.append('<a href="rev:{0}">{1}</a>'.format(
+                    branchHead, branch))
+            if branchLinks:
+                branchesStr = self.__branchesTemplate.format(
+                    ", ".join(branchLinks))
+            else:
+                branchesStr = ""
+            
+            tagLinks = []
+            for tag, tagCommit in self.__getTagsForCommit(commitId):
+                if tagCommit:
+                    tagLinks.append('<a href="rev:{0}">{1}</a>'.format(
+                        tagCommit, tag))
+                else:
+                    tagLinks.append(tag)
+            if tagLinks:
+                tagsStr = self.__tagsTemplate.format(
+                    ", ".join(tagLinks))
+            else:
+                tagsStr = ""
+            
+            if itm.data(0, self.__messageRole):
+                messageStr = self.__mesageTemplate.format(
+                    "<br/>".join(itm.data(0, self.__messageRole)))
+            else:
+                messageStr = ""
+            
+            html = self.__detailsTemplate.format(
+                commitId,
+                itm.text(self.DateColumn),
+                itm.text(self.AuthorColumn),
+                itm.data(0, self.__authorMailRole).strip(),
+                itm.text(self.CommitDateColumn),
+                itm.text(self.CommitterColumn),
+                itm.data(0, self.__committerMailRole).strip(),
+                parentsStr + childrenStr + branchesStr + tagsStr,
+                itm.data(0, self.__subjectRole),
+                messageStr,
+            )
+        else:
+            html = ""
+        
+        return html
+    
+    def __updateFilesTree(self, parent, itm):
+        """
+        Private method to update the files tree with changes of the given item.
+        
+        @param parent parent for the items to be added
+        @type QTreeWidget or QTreeWidgetItem
+        @param itm reference to the item the update should be based on
+        @type QTreeWidgetItem
+        """
+        if itm is not None:
+            changes = itm.data(0, self.__changesRole)
+            if len(changes) > 0:
+                for change in changes:
+                    self.__generateFileItem(
+                        change["action"], change["path"], change["copyfrom"],
+                        change["added"], change["deleted"])
+                self.__resizeColumnsFiles()
+                self.__resortFiles()
+    
+    def __getBranchesForCommit(self, commitId):
+        """
+        Private method to get all branches reachable from a commit ID.
+        
+        @param commitId commit ID to get the branches for
+        @type str
+        @return list of tuples containing the branch name and the associated
+            commit ID of its branch head
+        @rtype tuple of (str, str)
+        """
+        branches = []
+        
+        args = self.vcs.initCommand("branch")
+        args.append("--list")
+        args.append("--verbose")
+        args.append("--contains")
+        args.append(commitId)
+        
+        output = ""
+        process = QProcess()
+        process.setWorkingDirectory(self.repodir)
+        process.start('git', args)
+        procStarted = process.waitForStarted(5000)
+        if procStarted:
+            finished = process.waitForFinished(30000)
+            if finished and process.exitCode() == 0:
+                output = str(process.readAllStandardOutput(),
+                             Preferences.getSystem("IOEncoding"),
+                             'replace')
+        
+        if output:
+            for line in output.splitlines():
+                name, commitId = line[2:].split(None, 2)[:2]
+                branches.append((name, commitId))
+        
+        return branches
+    
+    def __getTagsForCommit(self, commitId):
+        """
+        Private method to get all tags reachable from a commit ID.
+        
+        @param commitId commit ID to get the tags for
+        @type str
+        @return list of tuples containing the tag name and the associated
+            commit ID
+        @rtype tuple of (str, str)
+        """
+        tags = []
+        
+        args = self.vcs.initCommand("tag")
+        args.append("--list")
+        args.append("--contains")
+        args.append(commitId)
+        
+        output = ""
+        process = QProcess()
+        process.setWorkingDirectory(self.repodir)
+        process.start('git', args)
+        procStarted = process.waitForStarted(5000)
+        if procStarted:
+            finished = process.waitForFinished(30000)
+            if finished and process.exitCode() == 0:
+                output = str(process.readAllStandardOutput(),
+                             Preferences.getSystem("IOEncoding"),
+                             'replace')
+        
+        if output:
+            tagNames = []
+            for line in output.splitlines():
+                tagNames.append(line.strip())
+            
+            # determine the commit IDs for the tags
+            for tagName in tagNames:
+                commitId = self.__getCommitForTag(tagName)
+                tags.append((tagName, commitId))
+        
+        return tags
+    
+    def __getCommitForTag(self, tag):
+        """
+        Private method to get the commit id for a tag.
+        
+        @param tag tag name (string)
+        @return commit id shortened to 10 characters (string)
+        """
+        args = self.vcs.initCommand("show")
+        args.append("--abbrev-commit")
+        args.append("--abbrev={0}".format(
+            self.vcs.getPlugin().getPreferences("CommitIdLength")))
+        args.append("--no-patch")
+        args.append(tag)
+        
+        output = ""
+        process = QProcess()
+        process.setWorkingDirectory(self.repodir)
+        process.start('git', args)
+        procStarted = process.waitForStarted(5000)
+        if procStarted:
+            finished = process.waitForFinished(30000)
+            if finished and process.exitCode() == 0:
+                output = str(process.readAllStandardOutput(),
+                             Preferences.getSystem("IOEncoding"),
+                             'replace')
+        
+        if output:
+            for line in output.splitlines():
+                if line.startswith("commit "):
+                    commitId = line.split()[1].strip()
+                    return commitId
+        
+        return ""
+    
+    @pyqtSlot(QPoint)
+    def on_logTree_customContextMenuRequested(self, pos):
+        """
+        Private slot to show the context menu of the log tree.
+        
+        @param pos position of the mouse pointer (QPoint)
+        """
+        self.__logTreeMenu.popup(self.logTree.mapToGlobal(pos))
+    
+    @pyqtSlot(QTreeWidgetItem, QTreeWidgetItem)
+    def on_logTree_currentItemChanged(self, current, previous):
+        """
+        Private slot called, when the current item of the log tree changes.
+        
+        @param current reference to the new current item (QTreeWidgetItem)
+        @param previous reference to the old current item (QTreeWidgetItem)
+        """
+        self.__updateToolMenuActions()
+        
+        # Highlight the current entry using a bold font
+        for col in range(self.logTree.columnCount()):
+            current and current.setFont(col, self.__logTreeBoldFont)
+            previous and previous.setFont(col, self.__logTreeNormalFont)
+        
+        # set the state of the up and down buttons
+        self.upButton.setEnabled(
+            current is not None and
+            self.logTree.indexOfTopLevelItem(current) > 0)
+        self.downButton.setEnabled(
+            current is not None and
+            len(current.data(0, self.__parentsRole)) > 0 and
+            (self.logTree.indexOfTopLevelItem(current) <
+                self.logTree.topLevelItemCount() - 1 or
+             self.nextButton.isEnabled()))
+    
+    @pyqtSlot()
+    def on_logTree_itemSelectionChanged(self):
+        """
+        Private slot called, when the selection has changed.
+        """
+        self.__updateDetailsAndFiles()
+        self.__updateSbsSelectLabel()
+        self.__updateToolMenuActions()
+        self.__generateDiffs()
+    
+    @pyqtSlot()
+    def on_upButton_clicked(self):
+        """
+        Private slot to move the current item up one entry.
+        """
+        itm = self.logTree.itemAbove(self.logTree.currentItem())
+        if itm:
+            self.logTree.setCurrentItem(itm)
+    
+    @pyqtSlot()
+    def on_downButton_clicked(self):
+        """
+        Private slot to move the current item down one entry.
+        """
+        itm = self.logTree.itemBelow(self.logTree.currentItem())
+        if itm:
+            self.logTree.setCurrentItem(itm)
+        else:
+            # load the next bunch and try again
+            if self.nextButton.isEnabled():
+                self.__addFinishCallback(self.on_downButton_clicked)
+                self.on_nextButton_clicked()
+    
+    @pyqtSlot()
+    def on_nextButton_clicked(self):
+        """
+        Private slot to handle the Next button.
+        """
+        if self.__skipEntries > 0 and self.nextButton.isEnabled():
+            self.__getLogEntries(skip=self.__skipEntries)
+    
+    @pyqtSlot(QDate)
+    def on_fromDate_dateChanged(self, date):
+        """
+        Private slot called, when the from date changes.
+        
+        @param date new date (QDate)
+        """
+        if self.__actionMode() == "filter":
+            self.__filterLogs()
+    
+    @pyqtSlot(QDate)
+    def on_toDate_dateChanged(self, date):
+        """
+        Private slot called, when the from date changes.
+        
+        @param date new date (QDate)
+        """
+        if self.__actionMode() == "filter":
+            self.__filterLogs()
+    
+    @pyqtSlot(str)
+    def on_fieldCombo_activated(self, txt):
+        """
+        Private slot called, when a new filter field is selected.
+        
+        @param txt text of the selected field (string)
+        """
+        if self.__actionMode() == "filter":
+            self.__filterLogs()
+    
+    @pyqtSlot(str)
+    def on_rxEdit_textChanged(self, txt):
+        """
+        Private slot called, when a filter expression is entered.
+        
+        @param txt filter expression (string)
+        """
+        if self.__actionMode() == "filter":
+            self.__filterLogs()
+        elif self.__actionMode() == "find":
+            self.__findItem(self.__findBackwards, interactive=True)
+    
+    @pyqtSlot()
+    def on_rxEdit_returnPressed(self):
+        """
+        Private slot handling a press of the Return key in the rxEdit input.
+        """
+        if self.__actionMode() == "find":
+            self.__findItem(self.__findBackwards, interactive=True)
+    
+    @pyqtSlot(bool)
+    def on_stopCheckBox_clicked(self, checked):
+        """
+        Private slot called, when the stop on copy/move checkbox is clicked.
+        
+        @param checked flag indicating the state of the check box (boolean)
+        """
+        self.vcs.getPlugin().setPreferences("StopLogOnCopy",
+                                            self.stopCheckBox.isChecked())
+        self.nextButton.setEnabled(True)
+        self.limitSpinBox.setEnabled(True)
+    
+    ##################################################################
+    ## Tool button menu action methods below
+    ##################################################################
+    
+    @pyqtSlot()
+    def __cherryActTriggered(self):
+        """
+        Private slot to handle the Copy Commits action.
+        """
+        commits = {}
+        
+        for itm in self.logTree.selectedItems():
+            index = self.logTree.indexOfTopLevelItem(itm)
+            commits[index] = itm.text(self.CommitIdColumn)
+        
+        if commits:
+            pfile = e5App().getObject("Project").getProjectFile()
+            lastModified = QFileInfo(pfile).lastModified().toString()
+            shouldReopen = (
+                self.vcs.gitCherryPick(
+                    self.repodir,
+                    [commits[i] for i in sorted(commits.keys(), reverse=True)]
+                ) or
+                QFileInfo(pfile).lastModified().toString() != lastModified
+            )
+            if shouldReopen:
+                res = E5MessageBox.yesNo(
+                    None,
+                    self.tr("Copy Changesets"),
+                    self.tr(
+                        """The project should be reread. Do this now?"""),
+                    yesDefault=True)
+                if res:
+                    e5App().getObject("Project").reopenProject()
+                    return
+            
+            self.on_refreshButton_clicked()
+    
+    @pyqtSlot()
+    def __tagActTriggered(self):
+        """
+        Private slot to tag the selected commit.
+        """
+        if len(self.logTree.selectedItems()) == 1:
+            itm = self.logTree.selectedItems()[0]
+            commit = itm.text(self.CommitIdColumn)
+            tag = itm.text(self.TagsColumn).strip().split(", ", 1)[0]
+            res = self.vcs.vcsTag(self.repodir, revision=commit, tagName=tag)
+            if res:
+                self.on_refreshButton_clicked()
+    
+    @pyqtSlot()
+    def __switchActTriggered(self):
+        """
+        Private slot to switch the working directory to the
+        selected commit.
+        """
+        if len(self.logTree.selectedItems()) == 1:
+            itm = self.logTree.selectedItems()[0]
+            commit = itm.text(self.CommitIdColumn)
+            branches = [b for b in itm.text(self.BranchColumn).split(", ")
+                        if "/" not in b]
+            if len(branches) == 1:
+                branch = branches[0]
+            elif len(branches) > 1:
+                branch, ok = QInputDialog.getItem(
+                    self,
+                    self.tr("Switch"),
+                    self.tr("Select a branch"),
+                    [""] + branches,
+                    0, False)
+                if not ok:
+                    return
+            else:
+                branch = ""
+            if branch:
+                rev = branch
+            else:
+                rev = commit
+            pfile = e5App().getObject("Project").getProjectFile()
+            lastModified = QFileInfo(pfile).lastModified().toString()
+            shouldReopen = (
+                self.vcs.vcsUpdate(self.repodir, revision=rev) or
+                QFileInfo(pfile).lastModified().toString() != lastModified
+            )
+            if shouldReopen:
+                res = E5MessageBox.yesNo(
+                    None,
+                    self.tr("Switch"),
+                    self.tr(
+                        """The project should be reread. Do this now?"""),
+                    yesDefault=True)
+                if res:
+                    e5App().getObject("Project").reopenProject()
+                    return
+            
+            self.on_refreshButton_clicked()
+    
+    @pyqtSlot()
+    def __branchActTriggered(self):
+        """
+        Private slot to create a new branch starting at the selected commit.
+        """
+        if len(self.logTree.selectedItems()) == 1:
+            from .GitBranchDialog import GitBranchDialog
+            itm = self.logTree.selectedItems()[0]
+            commit = itm.text(self.CommitIdColumn)
+            branches = [b for b in itm.text(self.BranchColumn).split(", ")
+                        if "/" not in b]
+            if len(branches) == 1:
+                branch = branches[0]
+            elif len(branches) > 1:
+                branch, ok = QInputDialog.getItem(
+                    self,
+                    self.tr("Branch"),
+                    self.tr("Select a default branch"),
+                    [""] + branches,
+                    0, False)
+                if not ok:
+                    return
+            else:
+                branch = ""
+            res = self.vcs.gitBranch(
+                self.repodir, revision=commit, branchName=branch,
+                branchOp=GitBranchDialog.CreateBranch)
+            if res:
+                self.on_refreshButton_clicked()
+    
+    @pyqtSlot()
+    def __branchSwitchActTriggered(self):
+        """
+        Private slot to create a new branch starting at the selected commit
+        and switch the work tree to it.
+        """
+        if len(self.logTree.selectedItems()) == 1:
+            from .GitBranchDialog import GitBranchDialog
+            itm = self.logTree.selectedItems()[0]
+            commit = itm.text(self.CommitIdColumn)
+            branches = [b for b in itm.text(self.BranchColumn).split(", ")
+                        if "/" not in b]
+            if len(branches) == 1:
+                branch = branches[0]
+            elif len(branches) > 1:
+                branch, ok = QInputDialog.getItem(
+                    self,
+                    self.tr("Branch & Switch"),
+                    self.tr("Select a default branch"),
+                    [""] + branches,
+                    0, False)
+                if not ok:
+                    return
+            else:
+                branch = ""
+            pfile = e5App().getObject("Project").getProjectFile()
+            lastModified = QFileInfo(pfile).lastModified().toString()
+            res, shouldReopen = self.vcs.gitBranch(
+                self.repodir, revision=commit, branchName=branch,
+                branchOp=GitBranchDialog.CreateSwitchBranch)
+            shouldReopen = shouldReopen or \
+                QFileInfo(pfile).lastModified().toString() != lastModified
+            if res:
+                if shouldReopen:
+                    res = E5MessageBox.yesNo(
+                        None,
+                        self.tr("Switch"),
+                        self.tr(
+                            """The project should be reread. Do this now?"""),
+                        yesDefault=True)
+                    if res:
+                        e5App().getObject("Project").reopenProject()
+                        return
+                
+                self.on_refreshButton_clicked()
+    
+    @pyqtSlot()
+    def __shortlogActTriggered(self):
+        """
+        Private slot to show a short log suitable for release announcements.
+        """
+        if len(self.logTree.selectedItems()) == 1:
+            itm = self.logTree.selectedItems()[0]
+            commit = itm.text(self.CommitIdColumn)
+            branch = itm.text(self.BranchColumn).split(", ", 1)[0]
+            branches = [b for b in itm.text(self.BranchColumn).split(", ")
+                        if "/" not in b]
+            if len(branches) == 1:
+                branch = branches[0]
+            elif len(branches) > 1:
+                branch, ok = QInputDialog.getItem(
+                    self,
+                    self.tr("Show Short Log"),
+                    self.tr("Select a branch"),
+                    [""] + branches,
+                    0, False)
+                if not ok:
+                    return
+            else:
+                branch = ""
+            if branch:
+                rev = branch
+            else:
+                rev = commit
+            self.vcs.gitShortlog(self.repodir, commit=rev)
+    
+    @pyqtSlot()
+    def __describeActTriggered(self):
+        """
+        Private slot to show the most recent tag reachable from a commit.
+        """
+        commits = []
+        
+        for itm in self.logTree.selectedItems():
+            commits.append(itm.text(self.CommitIdColumn))
+        
+        if commits:
+            self.vcs.gitDescribe(self.repodir, commits)
+    
+    ##################################################################
+    ## Log context menu action methods below
+    ##################################################################
+    
+    @pyqtSlot(bool)
+    def __showCommitterColumns(self, on):
+        """
+        Private slot to show/hide the committer columns.
+        
+        @param on flag indicating the selection state (boolean)
+        """
+        self.logTree.setColumnHidden(self.CommitterColumn, not on)
+        self.logTree.setColumnHidden(self.CommitDateColumn, not on)
+        self.vcs.getPlugin().setPreferences("ShowCommitterColumns", on)
+        self.__resizeColumnsLog()
+    
+    @pyqtSlot(bool)
+    def __showAuthorColumns(self, on):
+        """
+        Private slot to show/hide the committer columns.
+        
+        @param on flag indicating the selection state (boolean)
+        """
+        self.logTree.setColumnHidden(self.AuthorColumn, not on)
+        self.logTree.setColumnHidden(self.DateColumn, not on)
+        self.vcs.getPlugin().setPreferences("ShowAuthorColumns", on)
+        self.__resizeColumnsLog()
+    
+    @pyqtSlot(bool)
+    def __showCommitIdColumn(self, on):
+        """
+        Private slot to show/hide the commit ID column.
+        
+        @param on flag indicating the selection state (boolean)
+        """
+        self.logTree.setColumnHidden(self.CommitIdColumn, not on)
+        self.vcs.getPlugin().setPreferences("ShowCommitIdColumn", on)
+        self.__resizeColumnsLog()
+    
+    @pyqtSlot(bool)
+    def __showBranchesColumn(self, on):
+        """
+        Private slot to show/hide the branches column.
+        
+        @param on flag indicating the selection state (boolean)
+        """
+        self.logTree.setColumnHidden(self.BranchColumn, not on)
+        self.vcs.getPlugin().setPreferences("ShowBranchesColumn", on)
+        self.__resizeColumnsLog()
+    
+    @pyqtSlot(bool)
+    def __showTagsColumn(self, on):
+        """
+        Private slot to show/hide the tags column.
+        
+        @param on flag indicating the selection state (boolean)
+        """
+        self.logTree.setColumnHidden(self.TagsColumn, not on)
+        self.vcs.getPlugin().setPreferences("ShowTagsColumn", on)
+        self.__resizeColumnsLog()
+    
+    ##################################################################
+    ## Search and filter methods below
+    ##################################################################
+    
+    def __actionMode(self):
+        """
+        Private method to get the selected action mode.
+        
+        @return selected action mode (string, one of filter or find)
+        """
+        return self.modeComboBox.itemData(
+            self.modeComboBox.currentIndex())
+    
+    @pyqtSlot(int)
+    def on_modeComboBox_currentIndexChanged(self, index):
+        """
+        Private slot to react on mode changes.
+        
+        @param index index of the selected entry (integer)
+        """
+        mode = self.modeComboBox.itemData(index)
+        findMode = mode == "find"
+        filterMode = mode == "filter"
+        
+        self.fromDate.setEnabled(filterMode)
+        self.toDate.setEnabled(filterMode)
+        self.findPrevButton.setVisible(findMode)
+        self.findNextButton.setVisible(findMode)
+        
+        if findMode:
+            for topIndex in range(self.logTree.topLevelItemCount()):
+                self.logTree.topLevelItem(topIndex).setHidden(False)
+            self.logTree.header().setSectionHidden(self.IconColumn, False)
+        elif filterMode:
+            self.__filterLogs()
+    
+    @pyqtSlot()
+    def on_findPrevButton_clicked(self):
+        """
+        Private slot to find the previous item matching the entered criteria.
+        """
+        self.__findItem(True)
+    
+    @pyqtSlot()
+    def on_findNextButton_clicked(self):
+        """
+        Private slot to find the next item matching the entered criteria.
+        """
+        self.__findItem(False)
+    
+    def __findItem(self, backwards=False, interactive=False):
+        """
+        Private slot to find an item matching the entered criteria.
+        
+        @param backwards flag indicating to search backwards (boolean)
+        @param interactive flag indicating an interactive search (boolean)
+        """
+        self.__findBackwards = backwards
+        
+        fieldIndex, searchRx, indexIsRole = self.__prepareFieldSearch()
+        currentIndex = self.logTree.indexOfTopLevelItem(
+            self.logTree.currentItem())
+        if backwards:
+            if interactive:
+                indexes = range(currentIndex, -1, -1)
+            else:
+                indexes = range(currentIndex - 1, -1, -1)
+        else:
+            if interactive:
+                indexes = range(currentIndex, self.logTree.topLevelItemCount())
+            else:
+                indexes = range(currentIndex + 1,
+                                self.logTree.topLevelItemCount())
+        
+        for index in indexes:
+            topItem = self.logTree.topLevelItem(index)
+            if indexIsRole:
+                if fieldIndex == self.__changesRole:
+                    changes = topItem.data(0, self.__changesRole)
+                    txt = "\n".join(
+                        [c["path"] for c in changes] +
+                        [c["copyfrom"] for c in changes]
+                    )
+                else:
+                    # Filter based on complete subject text
+                    txt = topItem.data(0, self.__subjectRole)
+            else:
+                txt = topItem.text(fieldIndex)
+            if searchRx.indexIn(txt) > -1:
+                self.logTree.setCurrentItem(self.logTree.topLevelItem(index))
+                break
+        else:
+            E5MessageBox.information(
+                self,
+                self.tr("Find Commit"),
+                self.tr("""'{0}' was not found.""").format(self.rxEdit.text()))
+    
+    ##################################################################
+    ## Commit navigation methods below
+    ##################################################################
+    
+    def __commitIdClicked(self, url):
+        """
+        Private slot to handle the anchorClicked signal of the changeset
+        details pane.
+        
+        @param url URL that was clicked
+        @type QUrl
+        """
+        if url.scheme() == "rev":
+            # a commit ID was clicked, show the respective item
+            commitId = url.path()
+            items = self.logTree.findItems(commitId, Qt.MatchStartsWith,
+                                           self.CommitIdColumn)
+            if items:
+                itm = items[0]
+                if itm.isHidden():
+                    itm.setHidden(False)
+                self.logTree.setCurrentItem(itm)
+            else:
+                # load the next batch and try again
+                if self.nextButton.isEnabled():
+                    self.__addFinishCallback(
+                        lambda: self.__commitIdClicked(url))
+                    self.on_nextButton_clicked()
+    
+    ###########################################################################
+    ## Diff handling methods below
+    ###########################################################################
+    
+    def __generateDiffs(self, parent=1):
+        """
+        Private slot to generate diff outputs for the selected item.
+        
+        @param parent number of parent to diff against
+        @type int
+        """
+        self.diffEdit.clear()
+        self.diffLabel.setText(self.tr("Differences"))
+        self.diffSelectLabel.clear()
+        try:
+            self.diffHighlighter.regenerateRules()
+        except AttributeError:
+            # backward compatibility
+            pass
+        
+        selectedItems = self.logTree.selectedItems()
+        if len(selectedItems) == 1:
+            currentItem = selectedItems[0]
+            commit2 = currentItem.text(self.CommitIdColumn)
+            parents = currentItem.data(0, self.__parentsRole)
+            if len(parents) >= parent:
+                self.diffLabel.setText(
+                    self.tr("Differences to Parent {0}").format(parent))
+                commit1 = parents[parent - 1]
+                
+                self.__diffGenerator.start(self.__filename, [commit1, commit2])
+            
+            if len(parents) > 1:
+                parentLinks = []
+                for index in range(1, len(parents) + 1):
+                    if parent == index:
+                        parentLinks.append("&nbsp;{0}&nbsp;".format(index))
+                    else:
+                        parentLinks.append(
+                            '<a href="diff:{0}">&nbsp;{0}&nbsp;</a>'
+                            .format(index))
+                    self.diffSelectLabel.setText(
+                        self.tr('Diff to Parent {0}')
+                        .format(" ".join(parentLinks)))
+        elif len(selectedItems) == 2:
+            commit2 = selectedItems[0].text(self.CommitIdColumn)
+            commit1 = selectedItems[1].text(self.CommitIdColumn)
+            index2 = self.logTree.indexOfTopLevelItem(selectedItems[0])
+            index1 = self.logTree.indexOfTopLevelItem(selectedItems[1])
+            
+            if index2 < index1:
+                # swap to always compare old to new
+                commit1, commit2 = commit2, commit1
+            
+            self.__diffGenerator.start(self.__filename, [commit1, commit2])
+    
+    def __generatorFinished(self):
+        """
+        Private slot connected to the finished signal of the diff generator.
+        """
+        diff, _, errors, fileSeparators = self.__diffGenerator.getResult()
+        
+        if diff:
+            self.diffEdit.setPlainText("".join(diff))
+        elif errors:
+            self.diffEdit.setPlainText("".join(errors))
+        else:
+            self.diffEdit.setPlainText(self.tr('There is no difference.'))
+        
+        self.saveLabel.setVisible(bool(diff))
+        
+        fileSeparators = self.__mergeFileSeparators(fileSeparators)
+        if self.__diffUpdatesFiles:
+            for oldFileName, newFileName, lineNumber, _ in fileSeparators:
+                if oldFileName == newFileName:
+                    item = QTreeWidgetItem(self.filesTree, ["", oldFileName])
+                elif oldFileName == "/dev/null":
+                    item = QTreeWidgetItem(self.filesTree, ["", newFileName])
+                else:
+                    item = QTreeWidgetItem(
+                        self.filesTree, ["", newFileName, "", "", oldFileName])
+                item.setData(0, self.__diffFileLineRole, lineNumber)
+            self.__resizeColumnsFiles()
+            self.__resortFiles()
+        else:
+            for oldFileName, newFileName, lineNumber, _ in fileSeparators:
+                for fileName in (oldFileName, newFileName):
+                    if fileName != "/dev/null":
+                        items = self.filesTree.findItems(
+                            fileName, Qt.MatchExactly, 1)
+                        for item in items:
+                            item.setData(0, self.__diffFileLineRole,
+                                         lineNumber)
+        
+        tc = self.diffEdit.textCursor()
+        tc.movePosition(QTextCursor.Start)
+        self.diffEdit.setTextCursor(tc)
+        self.diffEdit.ensureCursorVisible()
+    
+    def __mergeFileSeparators(self, fileSeparators):
+        """
+        Private method to merge the file separator entries.
+        
+        @param fileSeparators list of file separator entries to be merged
+        @return merged list of file separator entries
+        """
+        separators = {}
+        for oldFile, newFile, pos1, pos2 in sorted(fileSeparators):
+            if (oldFile, newFile) not in separators:
+                separators[(oldFile, newFile)] = [oldFile, newFile, pos1, pos2]
+            else:
+                if pos1 != -2:
+                    separators[(oldFile, newFile)][2] = pos1
+                if pos2 != -2:
+                    separators[(oldFile, newFile)][3] = pos2
+        return list(separators.values())
+    
+    @pyqtSlot(QTreeWidgetItem, QTreeWidgetItem)
+    def on_filesTree_currentItemChanged(self, current, previous):
+        """
+        Private slot called, when the current item of the files tree changes.
+        
+        @param current reference to the new current item (QTreeWidgetItem)
+        @param previous reference to the old current item (QTreeWidgetItem)
+        """
+        if current:
+            para = current.data(0, self.__diffFileLineRole)
+            if para is not None:
+                if para == 0:
+                    tc = self.diffEdit.textCursor()
+                    tc.movePosition(QTextCursor.Start)
+                    self.diffEdit.setTextCursor(tc)
+                    self.diffEdit.ensureCursorVisible()
+                elif para == -1:
+                    tc = self.diffEdit.textCursor()
+                    tc.movePosition(QTextCursor.End)
+                    self.diffEdit.setTextCursor(tc)
+                    self.diffEdit.ensureCursorVisible()
+                else:
+                    # step 1: move cursor to end
+                    tc = self.diffEdit.textCursor()
+                    tc.movePosition(QTextCursor.End)
+                    self.diffEdit.setTextCursor(tc)
+                    self.diffEdit.ensureCursorVisible()
+                    
+                    # step 2: move cursor to desired line
+                    tc = self.diffEdit.textCursor()
+                    delta = tc.blockNumber() - para
+                    tc.movePosition(QTextCursor.PreviousBlock,
+                                    QTextCursor.MoveAnchor, delta)
+                    self.diffEdit.setTextCursor(tc)
+                    self.diffEdit.ensureCursorVisible()
+    
+    @pyqtSlot(str)
+    def on_diffSelectLabel_linkActivated(self, link):
+        """
+        Private slot to handle the selection of a diff target.
+        
+        @param link activated link
+        @type str
+        """
+        if ":" in link:
+            scheme, parent = link.split(":", 1)
+            if scheme == "diff":
+                try:
+                    parent = int(parent)
+                    self.__generateDiffs(parent)
+                except ValueError:
+                    # ignore silently
+                    pass
+    
+    @pyqtSlot(str)
+    def on_saveLabel_linkActivated(self, link):
+        """
+        Private slot to handle the selection of the save link.
+        
+        @param link activated link
+        @type str
+        """
+        if ":" not in link:
+            return
+        
+        scheme, rest = link.split(":", 1)
+        if scheme != "save" or rest != "me":
+            return
+        
+        if self.projectMode:
+            fname = self.vcs.splitPath(self.__filename)[0]
+            fname += "/{0}.diff".format(os.path.split(fname)[-1])
+        else:
+            dname, fname = self.vcs.splitPath(self.__filename)
+            if fname != '.':
+                fname = "{0}.diff".format(self.__filename)
+            else:
+                fname = dname
+        
+        fname, selectedFilter = E5FileDialog.getSaveFileNameAndFilter(
+            self,
+            self.tr("Save Diff"),
+            fname,
+            self.tr("Patch Files (*.diff)"),
+            None,
+            E5FileDialog.Options(E5FileDialog.DontConfirmOverwrite))
+        
+        if not fname:
+            return  # user aborted
+        
+        ext = QFileInfo(fname).suffix()
+        if not ext:
+            ex = selectedFilter.split("(*")[1].split(")")[0]
+            if ex:
+                fname += ex
+        if QFileInfo(fname).exists():
+            res = E5MessageBox.yesNo(
+                self,
+                self.tr("Save Diff"),
+                self.tr("<p>The patch file <b>{0}</b> already exists."
+                        " Overwrite it?</p>").format(fname),
+                icon=E5MessageBox.Warning)
+            if not res:
+                return
+        fname = Utilities.toNativeSeparators(fname)
+        
+        eol = e5App().getObject("Project").getEolString()
+        try:
+            f = open(fname, "w", encoding="utf-8", newline="")
+            f.write(eol.join(self.diffEdit.toPlainText().splitlines()))
+            f.write(eol)
+            f.close()
+        except IOError as why:
+            E5MessageBox.critical(
+                self, self.tr('Save Diff'),
+                self.tr(
+                    '<p>The patch file <b>{0}</b> could not be saved.'
+                    '<br>Reason: {1}</p>')
+                .format(fname, str(why)))
+    
+    @pyqtSlot(str)
+    def on_sbsSelectLabel_linkActivated(self, link):
+        """
+        Private slot to handle selection of a side-by-side link.
+        
+        @param link text of the selected link
+        @type str
+        """
+        if ":" in link:
+            scheme, path = link.split(":", 1)
+            if scheme == "sbsdiff" and "_" in path:
+                commit1, commit2 = path.split("_", 1)
+                self.vcs.gitSbsDiff(self.__filename,
+                                    revisions=(commit1, commit2))

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