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

# Copyright (c) 2014 - 2018 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to show the output of the git status command
process.
"""

from __future__ import unicode_literals
try:
    str = unicode
except NameError:
    pass

import os
import tempfile

from PyQt5.QtCore import pyqtSlot, Qt, QProcess, QTimer, QSize
from PyQt5.QtGui import QTextCursor, QCursor
from PyQt5.QtWidgets import QWidget, QDialogButtonBox, QMenu, QHeaderView, \
    QTreeWidgetItem, QLineEdit, QInputDialog, QToolTip

from E5Gui.E5Application import e5App
from E5Gui import E5MessageBox

from Globals import qVersionTuple

from .Ui_GitStatusDialog import Ui_GitStatusDialog

from .GitDiffHighlighter import GitDiffHighlighter
from .GitDiffGenerator import GitDiffGenerator
from .GitDiffParser import GitDiffParser
from .GitUtilities import strToQByteArray

import Preferences
import UI.PixmapCache
import Utilities


class GitStatusDialog(QWidget, Ui_GitStatusDialog):
    """
    Class implementing a dialog to show the output of the git status command
    process.
    """
    ConflictStates = ["AA", "AU", "DD", "DU", "UA", "UD", "UU"]
    
    ConflictRole = Qt.UserRole
    
    def __init__(self, vcs, parent=None):
        """
        Constructor
        
        @param vcs reference to the vcs object
        @param parent parent widget (QWidget)
        """
        super(GitStatusDialog, self).__init__(parent)
        self.setupUi(self)
        
        self.__toBeCommittedColumn = 0
        self.__statusWorkColumn = 1
        self.__statusIndexColumn = 2
        self.__pathColumn = 3
        self.__lastColumn = self.statusList.columnCount()
        
        self.refreshButton = self.buttonBox.addButton(
            self.tr("Refresh"), QDialogButtonBox.ActionRole)
        self.refreshButton.setToolTip(
            self.tr("Press to refresh the status display"))
        self.refreshButton.setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        
        self.diff = None
        self.vcs = vcs
        self.vcs.committed.connect(self.__committed)
        self.process = QProcess()
        self.process.finished.connect(self.__procFinished)
        self.process.readyReadStandardOutput.connect(self.__readStdout)
        self.process.readyReadStandardError.connect(self.__readStderr)
        
        self.errorGroup.hide()
        self.inputGroup.hide()
        
        self.vDiffSplitter.setStretchFactor(0, 2)
        self.vDiffSplitter.setStretchFactor(0, 2)
        self.vDiffSplitter.setSizes([400, 400])
        self.__hDiffSplitterState = None
        self.__vDiffSplitterState = None
        
        self.statusList.headerItem().setText(self.__lastColumn, "")
        self.statusList.header().setSortIndicator(
            self.__pathColumn, Qt.AscendingOrder)
        
        font = Preferences.getEditorOtherFonts("MonospacedFont")
        self.lDiffEdit.setFontFamily(font.family())
        self.lDiffEdit.setFontPointSize(font.pointSize())
        self.rDiffEdit.setFontFamily(font.family())
        self.rDiffEdit.setFontPointSize(font.pointSize())
        self.lDiffEdit.customContextMenuRequested.connect(
            self.__showLDiffContextMenu)
        self.rDiffEdit.customContextMenuRequested.connect(
            self.__showRDiffContextMenu)
        
        self.__lDiffMenu = QMenu()
        self.__stageLinesAct = self.__lDiffMenu.addAction(
            UI.PixmapCache.getIcon("vcsAdd.png"),
            self.tr("Stage Selected Lines"),
            self.__stageHunkOrLines)
        self.__revertLinesAct = self.__lDiffMenu.addAction(
            UI.PixmapCache.getIcon("vcsRevert.png"),
            self.tr("Revert Selected Lines"),
            self.__revertHunkOrLines)
        self.__stageHunkAct = self.__lDiffMenu.addAction(
            UI.PixmapCache.getIcon("vcsAdd.png"),
            self.tr("Stage Hunk"),
            self.__stageHunkOrLines)
        self.__revertHunkAct = self.__lDiffMenu.addAction(
            UI.PixmapCache.getIcon("vcsRevert.png"),
            self.tr("Revert Hunk"),
            self.__revertHunkOrLines)
        
        self.__rDiffMenu = QMenu()
        self.__unstageLinesAct = self.__rDiffMenu.addAction(
            UI.PixmapCache.getIcon("vcsRemove.png"),
            self.tr("Unstage Selected Lines"),
            self.__unstageHunkOrLines)
        self.__unstageHunkAct = self.__rDiffMenu.addAction(
            UI.PixmapCache.getIcon("vcsRemove.png"),
            self.tr("Unstage Hunk"),
            self.__unstageHunkOrLines)
        
        self.lDiffHighlighter = GitDiffHighlighter(self.lDiffEdit.document())
        self.rDiffHighlighter = GitDiffHighlighter(self.rDiffEdit.document())
        
        self.lDiffParser = None
        self.rDiffParser = None
        
        self.__selectedName = ""
        
        self.__diffGenerator = GitDiffGenerator(vcs, self)
        self.__diffGenerator.finished.connect(self.__generatorFinished)
        
        self.modifiedIndicators = [
            self.tr('added'),
            self.tr('copied'),
            self.tr('deleted'),
            self.tr('modified'),
            self.tr('renamed'),
        ]
        self.modifiedOnlyIndicators = [
            self.tr('modified'),
        ]
        
        self.unversionedIndicators = [
            self.tr('not tracked'),
        ]
        
        self.missingIndicators = [
            self.tr('deleted'),
        ]
        
        self.unmergedIndicators = [
            self.tr('unmerged'),
        ]

        self.status = {
            ' ': self.tr("unmodified"),
            'A': self.tr('added'),
            'C': self.tr('copied'),
            'D': self.tr('deleted'),
            'M': self.tr('modified'),
            'R': self.tr('renamed'),
            'U': self.tr('unmerged'),
            '?': self.tr('not tracked'),
            '!': self.tr('ignored'),
        }
        
        self.__ioEncoding = Preferences.getSystem("IOEncoding")
        
        self.__initActionsMenu()
    
    def __initActionsMenu(self):
        """
        Private method to initialize the actions menu.
        """
        self.__actionsMenu = QMenu()
        self.__actionsMenu.setTearOffEnabled(True)
        if qVersionTuple() >= (5, 1, 0):
            self.__actionsMenu.setToolTipsVisible(True)
        else:
            self.__actionsMenu.hovered.connect(self.__actionsMenuHovered)
        self.__actionsMenu.aboutToShow.connect(self.__showActionsMenu)
        
        self.__commitAct = self.__actionsMenu.addAction(
            self.tr("Commit"), self.__commit)
        self.__commitAct.setToolTip(self.tr("Commit the selected changes"))
        self.__amendAct = self.__actionsMenu.addAction(
            self.tr("Amend"), self.__amend)
        self.__amendAct.setToolTip(self.tr(
            "Amend the latest commit with the selected changes"))
        self.__commitSelectAct = self.__actionsMenu.addAction(
            self.tr("Select all for commit"), self.__commitSelectAll)
        self.__commitDeselectAct = self.__actionsMenu.addAction(
            self.tr("Unselect all from commit"), self.__commitDeselectAll)
        
        self.__actionsMenu.addSeparator()
        self.__addAct = self.__actionsMenu.addAction(
            self.tr("Add"), self.__add)
        self.__addAct.setToolTip(self.tr("Add the selected files"))
        self.__stageAct = self.__actionsMenu.addAction(
            self.tr("Stage changes"), self.__stage)
        self.__stageAct.setToolTip(self.tr(
            "Stages all changes of the selected files"))
        self.__unstageAct = self.__actionsMenu.addAction(
            self.tr("Unstage changes"), self.__unstage)
        self.__unstageAct.setToolTip(self.tr(
            "Unstages all changes of the selected files"))
        
        self.__actionsMenu.addSeparator()
        
        self.__diffAct = self.__actionsMenu.addAction(
            self.tr("Differences"), self.__diff)
        self.__diffAct.setToolTip(self.tr(
            "Shows the differences of the selected entry in a"
            " separate dialog"))
        self.__sbsDiffAct = self.__actionsMenu.addAction(
            self.tr("Differences Side-By-Side"), self.__sbsDiff)
        self.__sbsDiffAct.setToolTip(self.tr(
            "Shows the differences of the selected entry side-by-side in"
            " a separate dialog"))
        
        self.__actionsMenu.addSeparator()
        
        self.__revertAct = self.__actionsMenu.addAction(
            self.tr("Revert"), self.__revert)
        self.__revertAct.setToolTip(self.tr(
            "Reverts the changes of the selected files"))
        
        self.__actionsMenu.addSeparator()
        
        self.__forgetAct = self.__actionsMenu.addAction(
            self.tr("Forget missing"), self.__forget)
        self.__forgetAct.setToolTip(self.tr(
            "Forgets about the selected missing files"))
        self.__restoreAct = self.__actionsMenu.addAction(
            self.tr("Restore missing"), self.__restoreMissing)
        self.__restoreAct.setToolTip(self.tr(
            "Restores the selected missing files"))
        
        self.__actionsMenu.addSeparator()
        
        self.__editAct = self.__actionsMenu.addAction(
            self.tr("Edit file"), self.__editConflict)
        self.__editAct.setToolTip(self.tr(
            "Edit the selected conflicting file"))
        
        self.__actionsMenu.addSeparator()
        
        act = self.__actionsMenu.addAction(
            self.tr("Adjust column sizes"), self.__resizeColumns)
        act.setToolTip(self.tr(
            "Adjusts the width of all columns to their contents"))
        
        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 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(
            "StatusDialogGeometry", self.saveGeometry())
        self.vcs.getPlugin().setPreferences(
            "StatusDialogSplitterStates", [
                self.vDiffSplitter.saveState(),
                self.hDiffSplitter.saveState()
            ]
        )
        
        e.accept()
    
    def show(self):
        """
        Public slot to show the dialog.
        """
        super(GitStatusDialog, self).show()
        
        geom = self.vcs.getPlugin().getPreferences(
            "StatusDialogGeometry")
        if geom.isEmpty():
            s = QSize(900, 600)
            self.resize(s)
        else:
            self.restoreGeometry(geom)
        
        states = self.vcs.getPlugin().getPreferences(
            "StatusDialogSplitterStates")
        if len(states) == 2:
            # we have two splitters
            self.vDiffSplitter.restoreState(states[0])
            self.hDiffSplitter.restoreState(states[1])
    
    def __resort(self):
        """
        Private method to resort the tree.
        """
        self.statusList.sortItems(
            self.statusList.sortColumn(),
            self.statusList.header().sortIndicatorOrder())
    
    def __resizeColumns(self):
        """
        Private method to resize the list columns.
        """
        self.statusList.header().resizeSections(QHeaderView.ResizeToContents)
        self.statusList.header().setStretchLastSection(True)
    
    def __generateItem(self, status, path):
        """
        Private method to generate a status item in the status list.
        
        @param status status indicator (string)
        @param path path of the file or directory (string)
        """
        statusWorkText = self.status[status[1]]
        statusIndexText = self.status[status[0]]
        itm = QTreeWidgetItem(self.statusList, [
            "",
            statusWorkText,
            statusIndexText,
            path,
        ])
        
        itm.setTextAlignment(self.__statusWorkColumn, Qt.AlignHCenter)
        itm.setTextAlignment(self.__statusIndexColumn, Qt.AlignHCenter)
        itm.setTextAlignment(self.__pathColumn, Qt.AlignLeft)
    
        if status not in self.ConflictStates + ["??", "!!"] and \
                statusIndexText in self.modifiedIndicators:
            itm.setFlags(itm.flags() | Qt.ItemIsUserCheckable)
            itm.setCheckState(self.__toBeCommittedColumn, Qt.Checked)
        else:
            itm.setFlags(itm.flags() & ~Qt.ItemIsUserCheckable)
        
        if statusWorkText not in self.__statusFilters:
            self.__statusFilters.append(statusWorkText)
        if statusIndexText not in self.__statusFilters:
            self.__statusFilters.append(statusIndexText)
        
        if status in self.ConflictStates:
            itm.setIcon(self.__statusWorkColumn,
                        UI.PixmapCache.getIcon(
                            os.path.join("VcsPlugins", "vcsGit", "icons",
                                         "conflict.png")))
        itm.setData(0, self.ConflictRole, status in self.ConflictStates)
    
    def start(self, fn):
        """
        Public slot to start the git status command.
        
        @param fn filename(s)/directoryname(s) to show the status of
            (string or list of strings)
        """
        self.errorGroup.hide()
        self.intercept = False
        self.args = fn
        
        self.__ioEncoding = Preferences.getSystem("IOEncoding")
        
        self.statusFilterCombo.clear()
        self.__statusFilters = []
        self.statusList.clear()
        
        self.setWindowTitle(self.tr('Git Status'))
        
        args = self.vcs.initCommand("status")
        args.append('--porcelain')
        args.append("--")
        if isinstance(fn, list):
            self.dname, fnames = self.vcs.splitPathList(fn)
            self.vcs.addArguments(args, fn)
        else:
            self.dname, fname = self.vcs.splitPath(fn)
            args.append(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.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'))
        else:
            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)
    
    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)
        
        self.inputGroup.setEnabled(False)
        self.inputGroup.hide()
        self.refreshButton.setEnabled(True)
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
        self.buttonBox.button(QDialogButtonBox.Close).setFocus(
            Qt.OtherFocusReason)
        
        self.__statusFilters.sort()
        self.__statusFilters.insert(0, "<{0}>".format(self.tr("all")))
        self.statusFilterCombo.addItems(self.__statusFilters)
        
        self.__resort()
        self.__resizeColumns()
        
        self.__refreshDiff()
    
    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.__finish()
        elif button == self.refreshButton:
            self.on_refreshButton_clicked()
    
    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.__finish()
    
    def __readStdout(self):
        """
        Private slot to handle the readyReadStandardOutput signal.
        
        It reads the output of the process, formats it and inserts it into
        the contents pane.
        """
        if self.process is not None:
            self.process.setReadChannel(QProcess.StandardOutput)
            
            while self.process.canReadLine():
                line = str(self.process.readLine(), self.__ioEncoding,
                           'replace')
                
                status = line[:2]
                path = line[3:].strip().split(" -> ")[-1].strip('"')
                self.__generateItem(status, path)
    
    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(),
                    self.__ioEncoding, 'replace')
            self.errorGroup.show()
            self.errors.insertPlainText(s)
            self.errors.ensureCursorVisible()
            
            # show input in case the process asked for some input
            self.inputGroup.setEnabled(True)
            self.inputGroup.show()
    
    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.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(GitStatusDialog, self).keyPressEvent(evt)
    
    @pyqtSlot()
    def on_refreshButton_clicked(self):
        """
        Private slot to refresh the status display.
        """
        selectedItems = self.statusList.selectedItems()
        if len(selectedItems) == 1:
            self.__selectedName = selectedItems[0].text(self.__pathColumn)
        else:
            self.__selectedName = ""
        
        self.start(self.args)
    
    @pyqtSlot(str)
    def on_statusFilterCombo_activated(self, txt):
        """
        Private slot to react to the selection of a status filter.
        
        @param txt selected status filter (string)
        """
        if txt == "<{0}>".format(self.tr("all")):
            for topIndex in range(self.statusList.topLevelItemCount()):
                topItem = self.statusList.topLevelItem(topIndex)
                topItem.setHidden(False)
        else:
            for topIndex in range(self.statusList.topLevelItemCount()):
                topItem = self.statusList.topLevelItem(topIndex)
                topItem.setHidden(
                    topItem.text(self.__statusWorkColumn) != txt and
                    topItem.text(self.__statusIndexColumn) != txt
                )
    
    @pyqtSlot()
    def on_statusList_itemSelectionChanged(self):
        """
        Private slot to act upon changes of selected items.
        """
        self.__generateDiffs()
    
    ###########################################################################
    ## Menu handling methods
    ###########################################################################
    
    def __showActionsMenu(self):
        """
        Private slot to prepare the actions button menu before it is shown.
        """
        modified = len(self.__getModifiedItems())
        modifiedOnly = len(self.__getModifiedOnlyItems())
        unversioned = len(self.__getUnversionedItems())
        missing = len(self.__getMissingItems())
        commitable = len(self.__getCommitableItems())
        commitableUnselected = len(self.__getCommitableUnselectedItems())
        stageable = len(self.__getStageableItems())
        unstageable = len(self.__getUnstageableItems())
        conflicting = len(self.__getConflictingItems())

        self.__commitAct.setEnabled(commitable)
        self.__amendAct.setEnabled(commitable)
        self.__commitSelectAct.setEnabled(commitableUnselected)
        self.__commitDeselectAct.setEnabled(commitable)
        self.__addAct.setEnabled(unversioned)
        self.__stageAct.setEnabled(stageable)
        self.__unstageAct.setEnabled(unstageable)
        self.__diffAct.setEnabled(modified)
        self.__sbsDiffAct.setEnabled(modifiedOnly == 1)
        self.__revertAct.setEnabled(stageable)
        self.__forgetAct.setEnabled(missing)
        self.__restoreAct.setEnabled(missing)
        self.__editAct.setEnabled(conflicting == 1)
    
    def __amend(self):
        """
        Private slot to handle the Amend context menu entry.
        """
        self.__commit(amend=True)
    
    def __commit(self, amend=False):
        """
        Private slot to handle the Commit context menu entry.
        
        @param amend flag indicating to perform an amend operation (boolean)
        """
        names = [os.path.join(self.dname, itm.text(self.__pathColumn))
                 for itm in self.__getCommitableItems()]
        if not names:
            E5MessageBox.information(
                self,
                self.tr("Commit"),
                self.tr("""There are no entries selected to be"""
                        """ committed."""))
            return
        
        if Preferences.getVCS("AutoSaveFiles"):
            vm = e5App().getObject("ViewManager")
            for name in names:
                vm.saveEditor(name)
        self.vcs.vcsCommit(names, commitAll=False, amend=amend)
        # staged changes
    
    def __committed(self):
        """
        Private slot called after the commit has finished.
        """
        if self.isVisible():
            self.on_refreshButton_clicked()
            self.vcs.checkVCSStatus()
    
    def __commitSelectAll(self):
        """
        Private slot to select all entries for commit.
        """
        self.__commitSelect(True)
    
    def __commitDeselectAll(self):
        """
        Private slot to deselect all entries from commit.
        """
        self.__commitSelect(False)
    
    def __add(self):
        """
        Private slot to handle the Add context menu entry.
        """
        names = [os.path.join(self.dname, itm.text(self.__pathColumn))
                 for itm in self.__getUnversionedItems()]
        if not names:
            E5MessageBox.information(
                self,
                self.tr("Add"),
                self.tr("""There are no unversioned entries"""
                        """ available/selected."""))
            return
        
        self.vcs.vcsAdd(names)
        self.on_refreshButton_clicked()
        
        project = e5App().getObject("Project")
        for name in names:
            project.getModel().updateVCSStatus(name)
        self.vcs.checkVCSStatus()
    
    def __stage(self):
        """
        Private slot to handle the Stage context menu entry.
        """
        names = [os.path.join(self.dname, itm.text(self.__pathColumn))
                 for itm in self.__getStageableItems()]
        if not names:
            E5MessageBox.information(
                self,
                self.tr("Stage"),
                self.tr("""There are no stageable entries"""
                        """ available/selected."""))
            return
        
        self.vcs.vcsAdd(names)
        self.on_refreshButton_clicked()
        
        project = e5App().getObject("Project")
        for name in names:
            project.getModel().updateVCSStatus(name)
        self.vcs.checkVCSStatus()
    
    def __unstage(self):
        """
        Private slot to handle the Unstage context menu entry.
        """
        names = [os.path.join(self.dname, itm.text(self.__pathColumn))
                 for itm in self.__getUnstageableItems()]
        if not names:
            E5MessageBox.information(
                self,
                self.tr("Unstage"),
                self.tr("""There are no unstageable entries"""
                        """ available/selected."""))
            return
        
        self.vcs.gitUnstage(names)
        self.on_refreshButton_clicked()
        
        project = e5App().getObject("Project")
        for name in names:
            project.getModel().updateVCSStatus(name)
        self.vcs.checkVCSStatus()
    
    def __forget(self):
        """
        Private slot to handle the Forget Missing context menu entry.
        """
        names = [os.path.join(self.dname, itm.text(self.__pathColumn))
                 for itm in self.__getMissingItems()]
        if not names:
            E5MessageBox.information(
                self,
                self.tr("Forget Missing"),
                self.tr("""There are no missing entries"""
                        """ available/selected."""))
            return

        self.vcs.vcsRemove(names, stageOnly=True)
        self.on_refreshButton_clicked()

    def __revert(self):
        """
        Private slot to handle the Revert context menu entry.
        """
        names = [os.path.join(self.dname, itm.text(self.__pathColumn))
                 for itm in self.__getStageableItems()]
        if not names:
            E5MessageBox.information(
                self,
                self.tr("Revert"),
                self.tr("""There are no uncommitted, unstaged changes"""
                        """ available/selected."""))
            return

        self.vcs.gitRevert(names)
        self.raise_()
        self.activateWindow()
        self.on_refreshButton_clicked()

        project = e5App().getObject("Project")
        for name in names:
            project.getModel().updateVCSStatus(name)
        self.vcs.checkVCSStatus()

    def __restoreMissing(self):
        """
        Private slot to handle the Restore Missing context menu entry.
        """
        names = [os.path.join(self.dname, itm.text(self.__pathColumn))
                 for itm in self.__getMissingItems()]
        if not names:
            E5MessageBox.information(
                self,
                self.tr("Restore Missing"),
                self.tr("""There are no missing entries"""
                        """ available/selected."""))
            return

        self.vcs.gitRevert(names)
        self.on_refreshButton_clicked()
        self.vcs.checkVCSStatus()
    
    def __editConflict(self):
        """
        Private slot to handle the Edit file context menu entry.
        """
        itm = self.__getConflictingItems()[0]
        filename = os.path.join(self.__repodir, itm.text(self.__pathColumn))
        if Utilities.MimeTypes.isTextFile(filename):
            e5App().getObject("ViewManager").getEditor(filename)

    def __diff(self):
        """
        Private slot to handle the Diff context menu entry.
        """
        namesW = [os.path.join(self.dname, itm.text(self.__pathColumn))
                  for itm in self.__getStageableItems()]
        namesS = [os.path.join(self.dname, itm.text(self.__pathColumn))
                  for itm in self.__getUnstageableItems()]
        if not namesW and not namesS:
            E5MessageBox.information(
                self,
                self.tr("Differences"),
                self.tr("""There are no uncommitted changes"""
                        """ available/selected."""))
            return
        
        diffMode = "work2stage2repo"
        names = namesW + namesS
        
        if self.diff is None:
            from .GitDiffDialog import GitDiffDialog
            self.diff = GitDiffDialog(self.vcs)
        self.diff.show()
        self.diff.start(names, diffMode=diffMode, refreshable=True)
    
    def __sbsDiff(self):
        """
        Private slot to handle the Diff context menu entry.
        """
        itm = self.__getModifiedOnlyItems()[0]
        workModified = (itm.text(self.__statusWorkColumn) in
                        self.modifiedOnlyIndicators)
        stageModified = (itm.text(self.__statusIndexColumn) in
                         self.modifiedOnlyIndicators)
        names = [os.path.join(self.dname, itm.text(self.__pathColumn))]
        
        if workModified and stageModified:
            # select from all three variants
            messages = [
                self.tr("Working Tree to Staging Area"),
                self.tr("Staging Area to HEAD Commit"),
                self.tr("Working Tree to HEAD Commit"),
            ]
            result, ok = QInputDialog.getItem(
                None,
                self.tr("Side-by-Side Difference"),
                self.tr("Select the compare method."),
                messages,
                0, False)
            if not ok:
                return
            
            if result == messages[0]:
                revisions = ["", ""]
            elif result == messages[1]:
                revisions = ["HEAD", "Stage"]
            else:
                revisions = ["HEAD", ""]
        elif workModified:
            # select from work variants
            messages = [
                self.tr("Working Tree to Staging Area"),
                self.tr("Working Tree to HEAD Commit"),
            ]
            result, ok = QInputDialog.getItem(
                None,
                self.tr("Side-by-Side Difference"),
                self.tr("Select the compare method."),
                messages,
                0, False)
            if not ok:
                return
            
            if result == messages[0]:
                revisions = ["", ""]
            else:
                revisions = ["HEAD", ""]
        else:
            revisions = ["HEAD", "Stage"]
        
        self.vcs.gitSbsDiff(names[0], revisions=revisions)
    
    def __getCommitableItems(self):
        """
        Private method to retrieve all entries the user wants to commit.
        
        @return list of all items, the user has checked
        """
        commitableItems = []
        for index in range(self.statusList.topLevelItemCount()):
            itm = self.statusList.topLevelItem(index)
            if itm.checkState(self.__toBeCommittedColumn) == Qt.Checked:
                commitableItems.append(itm)
        return commitableItems
    
    def __getCommitableUnselectedItems(self):
        """
        Private method to retrieve all entries the user may commit but hasn't
        selected.
        
        @return list of all items, the user has not checked
        """
        items = []
        for index in range(self.statusList.topLevelItemCount()):
            itm = self.statusList.topLevelItem(index)
            if itm.flags() & Qt.ItemIsUserCheckable and \
               itm.checkState(self.__toBeCommittedColumn) == Qt.Unchecked:
                items.append(itm)
        return items
    
    def __getModifiedItems(self):
        """
        Private method to retrieve all entries, that have a modified status.
        
        @return list of all items with a modified status
        """
        modifiedItems = []
        for itm in self.statusList.selectedItems():
            if (itm.text(self.__statusWorkColumn) in
                    self.modifiedIndicators or
                itm.text(self.__statusIndexColumn) in
                    self.modifiedIndicators):
                modifiedItems.append(itm)
        return modifiedItems
    
    def __getModifiedOnlyItems(self):
        """
        Private method to retrieve all entries, that have a modified status.
        
        @return list of all items with a modified status
        """
        modifiedItems = []
        for itm in self.statusList.selectedItems():
            if (itm.text(self.__statusWorkColumn) in
                    self.modifiedOnlyIndicators or
                itm.text(self.__statusIndexColumn) in
                    self.modifiedOnlyIndicators):
                modifiedItems.append(itm)
        return modifiedItems
    
    def __getUnversionedItems(self):
        """
        Private method to retrieve all entries, that have an unversioned
        status.
        
        @return list of all items with an unversioned status
        """
        unversionedItems = []
        for itm in self.statusList.selectedItems():
            if itm.text(self.__statusWorkColumn) in self.unversionedIndicators:
                unversionedItems.append(itm)
        return unversionedItems
    
    def __getStageableItems(self):
        """
        Private method to retrieve all entries, that have a stageable
        status.
        
        @return list of all items with a stageable status
        """
        stageableItems = []
        for itm in self.statusList.selectedItems():
            if itm.text(self.__statusWorkColumn) in \
                    self.modifiedIndicators + self.unmergedIndicators:
                stageableItems.append(itm)
        return stageableItems
    
    def __getUnstageableItems(self):
        """
        Private method to retrieve all entries, that have an unstageable
        status.
        
        @return list of all items with an unstageable status
        """
        unstageableItems = []
        for itm in self.statusList.selectedItems():
            if itm.text(self.__statusIndexColumn) in self.modifiedIndicators:
                unstageableItems.append(itm)
        return unstageableItems
    
    def __getMissingItems(self):
        """
        Private method to retrieve all entries, that have a missing status.
        
        @return list of all items with a missing status
        """
        missingItems = []
        for itm in self.statusList.selectedItems():
            if itm.text(self.__statusWorkColumn) in self.missingIndicators:
                missingItems.append(itm)
        return missingItems
    
    def __getConflictingItems(self):
        """
        Private method to retrieve all entries, that have a conflict status.
        
        @return list of all items with a conflict status
        """
        conflictingItems = []
        for itm in self.statusList.selectedItems():
            if itm.data(0, self.ConflictRole):
                conflictingItems.append(itm)
        return conflictingItems
    
    def __commitSelect(self, selected):
        """
        Private slot to select or deselect all entries.
        
        @param selected commit selection state to be set (boolean)
        """
        for index in range(self.statusList.topLevelItemCount()):
            itm = self.statusList.topLevelItem(index)
            if itm.flags() & Qt.ItemIsUserCheckable:
                if selected:
                    itm.setCheckState(self.__toBeCommittedColumn, Qt.Checked)
                else:
                    itm.setCheckState(self.__toBeCommittedColumn, Qt.Unchecked)
    
    ###########################################################################
    ## Diff handling methods below
    ###########################################################################
    
    def __generateDiffs(self):
        """
        Private slot to generate diff outputs for the selected item.
        """
        self.lDiffEdit.clear()
        self.rDiffEdit.clear()
        try:
            self.lDiffHighlighter.regenerateRules()
            self.rDiffHighlighter.regenerateRules()
        except AttributeError:
            # backward compatibility
            pass
        
        selectedItems = self.statusList.selectedItems()
        if len(selectedItems) == 1:
            fn = os.path.join(self.dname,
                              selectedItems[0].text(self.__pathColumn))
            self.__diffGenerator.start(fn, diffMode="work2stage2repo")
    
    def __generatorFinished(self):
        """
        Private slot connected to the finished signal of the diff generator.
        """
        diff1, diff2 = self.__diffGenerator.getResult()[:2]
        
        if diff1:
            self.lDiffParser = GitDiffParser(diff1)
            for line in diff1[:]:
                if line.startswith("@@ "):
                    break
                else:
                    diff1.pop(0)
            self.lDiffEdit.setPlainText("".join(diff1))
        else:
            self.lDiffParser = None
        
        if diff2:
            self.rDiffParser = GitDiffParser(diff2)
            for line in diff2[:]:
                if line.startswith("@@ "):
                    break
                else:
                    diff2.pop(0)
            self.rDiffEdit.setPlainText("".join(diff2))
        else:
            self.rDiffParser = None
        
        for diffEdit in [self.lDiffEdit, self.rDiffEdit]:
            tc = diffEdit.textCursor()
            tc.movePosition(QTextCursor.Start)
            diffEdit.setTextCursor(tc)
            diffEdit.ensureCursorVisible()
    
    def __showLDiffContextMenu(self, coord):
        """
        Private slot to show the context menu of the status list.
        
        @param coord position of the mouse pointer (QPoint)
        """
        if bool(self.lDiffEdit.toPlainText()):
            cursor = self.lDiffEdit.textCursor()
            if cursor.hasSelection():
                self.__stageLinesAct.setEnabled(True)
                self.__revertLinesAct.setEnabled(True)
                self.__stageHunkAct.setEnabled(False)
                self.__revertHunkAct.setEnabled(False)
            else:
                self.__stageLinesAct.setEnabled(False)
                self.__revertLinesAct.setEnabled(False)
                self.__stageHunkAct.setEnabled(True)
                self.__revertHunkAct.setEnabled(True)
                
                cursor = self.lDiffEdit.cursorForPosition(coord)
                self.lDiffEdit.setTextCursor(cursor)
            
            self.__lDiffMenu.popup(self.lDiffEdit.mapToGlobal(coord))
    
    def __showRDiffContextMenu(self, coord):
        """
        Private slot to show the context menu of the status list.
        
        @param coord position of the mouse pointer (QPoint)
        """
        if bool(self.rDiffEdit.toPlainText()):
            cursor = self.rDiffEdit.textCursor()
            if cursor.hasSelection():
                self.__unstageLinesAct.setEnabled(True)
                self.__unstageHunkAct.setEnabled(False)
            else:
                self.__unstageLinesAct.setEnabled(False)
                self.__unstageHunkAct.setEnabled(True)
                
                cursor = self.rDiffEdit.cursorForPosition(coord)
                self.rDiffEdit.setTextCursor(cursor)
            
            self.__rDiffMenu.popup(self.rDiffEdit.mapToGlobal(coord))
    
    def __stageHunkOrLines(self):
        """
        Private method to stage the selected lines or hunk.
        """
        cursor = self.lDiffEdit.textCursor()
        startIndex, endIndex = self.__selectedLinesIndexes(self.lDiffEdit)
        if cursor.hasSelection():
            patch = self.lDiffParser.createLinesPatch(startIndex, endIndex)
        else:
            patch = self.lDiffParser.createHunkPatch(startIndex)
        if patch:
            patchFile = self.__tmpPatchFileName()
            try:
                f = open(patchFile, "w")
                f.write(patch)
                f.close()
                self.vcs.gitApply(self.dname, patchFile, cached=True,
                                  noDialog=True)
                self.on_refreshButton_clicked()
            finally:
                os.remove(patchFile)
    
    def __unstageHunkOrLines(self):
        """
        Private method to unstage the selected lines or hunk.
        """
        cursor = self.rDiffEdit.textCursor()
        startIndex, endIndex = self.__selectedLinesIndexes(self.rDiffEdit)
        if cursor.hasSelection():
            patch = self.rDiffParser.createLinesPatch(startIndex, endIndex,
                                                      reverse=True)
        else:
            patch = self.rDiffParser.createHunkPatch(startIndex)
        if patch:
            patchFile = self.__tmpPatchFileName()
            try:
                f = open(patchFile, "w")
                f.write(patch)
                f.close()
                self.vcs.gitApply(self.dname, patchFile, cached=True,
                                  reverse=True, noDialog=True)
                self.on_refreshButton_clicked()
            finally:
                os.remove(patchFile)
    
    def __revertHunkOrLines(self):
        """
        Private method to revert the selected lines or hunk.
        """
        cursor = self.lDiffEdit.textCursor()
        startIndex, endIndex = self.__selectedLinesIndexes(self.lDiffEdit)
        if cursor.hasSelection():
            title = self.tr("Revert selected lines")
        else:
            title = self.tr("Revert hunk")
        res = E5MessageBox.yesNo(
            self,
            title,
            self.tr("""Are you sure you want to revert the selected"""
                    """ changes?"""))
        if res:
            if cursor.hasSelection():
                patch = self.lDiffParser.createLinesPatch(startIndex, endIndex,
                                                          reverse=True)
            else:
                patch = self.lDiffParser.createHunkPatch(startIndex)
            if patch:
                patchFile = self.__tmpPatchFileName()
                try:
                    f = open(patchFile, "w")
                    f.write(patch)
                    f.close()
                    self.vcs.gitApply(self.dname, patchFile, reverse=True,
                                      noDialog=True)
                    self.on_refreshButton_clicked()
                finally:
                    os.remove(patchFile)
    
    def __selectedLinesIndexes(self, diffEdit):
        """
        Private method to extract the indexes of the selected lines.
        
        @param diffEdit reference to the edit widget (QTextEdit)
        @return tuple of start and end indexes (integer, integer)
        """
        cursor = diffEdit.textCursor()
        selectionStart = cursor.selectionStart()
        selectionEnd = cursor.selectionEnd()

        startIndex = -1
        
        lineStart = 0
        for lineIdx, line in enumerate(diffEdit.toPlainText().splitlines()):
            lineEnd = lineStart + len(line)
            if lineStart <= selectionStart <= lineEnd:
                startIndex = lineIdx
            if lineStart <= selectionEnd <= lineEnd:
                endIndex = lineIdx
                break
            lineStart = lineEnd + 1

        return startIndex, endIndex
    
    def __tmpPatchFileName(self):
        """
        Private method to generate a temporary patch file.
        
        @return name of the temporary file (string)
        """
        prefix = 'eric-git-{0}-'.format(os.getpid())
        suffix = '-patch'
        fd, path = tempfile.mkstemp(suffix, prefix)
        os.close(fd)
        return path
    
    def __refreshDiff(self):
        """
        Private method to refresh the diff output after a refresh.
        """
        if self.__selectedName:
            for index in range(self.statusList.topLevelItemCount()):
                itm = self.statusList.topLevelItem(index)
                if itm.text(self.__pathColumn) == self.__selectedName:
                    itm.setSelected(True)
                    break
        
        self.__selectedName = ""
