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

# Copyright (c) 2011 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the queues extension interface.
"""


import os

from PyQt5.QtCore import QProcess
from PyQt5.QtWidgets import QDialog, QApplication, QInputDialog

from E5Gui import E5MessageBox

from ..HgExtension import HgExtension
from ..HgDialog import HgDialog


class Queues(HgExtension):
    """
    Class implementing the queues extension interface.
    """
    APPLIED_LIST = 0
    UNAPPLIED_LIST = 1
    SERIES_LIST = 2
    
    POP = 0
    PUSH = 1
    GOTO = 2
    
    QUEUE_DELETE = 0
    QUEUE_PURGE = 1
    QUEUE_ACTIVATE = 2
    
    def __init__(self, vcs):
        """
        Constructor
        
        @param vcs reference to the Mercurial vcs object
        """
        super(Queues, self).__init__(vcs)
        
        self.qdiffDialog = None
        self.qheaderDialog = None
        self.queuesListDialog = None
        self.queuesListGuardsDialog = None
        self.queuesListAllGuardsDialog = None
        self.queuesDefineGuardsDialog = None
        self.queuesListQueuesDialog = None
        self.queueStatusDialog = None
    
    def shutdown(self):
        """
        Public method used to shutdown the queues interface.
        """
        if self.qdiffDialog is not None:
            self.qdiffDialog.close()
        if self.qheaderDialog is not None:
            self.qheaderDialog.close()
        if self.queuesListDialog is not None:
            self.queuesListDialog.close()
        if self.queuesListGuardsDialog is not None:
            self.queuesListGuardsDialog.close()
        if self.queuesListAllGuardsDialog is not None:
            self.queuesListAllGuardsDialog.close()
        if self.queuesDefineGuardsDialog is not None:
            self.queuesDefineGuardsDialog.close()
        if self.queuesListQueuesDialog is not None:
            self.queuesListQueuesDialog.close()
        if self.queueStatusDialog is not None:
            self.queueStatusDialog.close()
    
    def __getPatchesList(self, repodir, listType, withSummary=False):
        """
        Private method to get a list of patches of a given type.
        
        @param repodir directory name of the repository (string)
        @param listType type of patches list to get
            (Queues.APPLIED_LIST, Queues.UNAPPLIED_LIST, Queues.SERIES_LIST)
        @param withSummary flag indicating to get a summary as well (boolean)
        @return list of patches (list of string)
        @exception ValueError raised to indicate an invalid patch list type
        """
        patchesList = []
        
        if listType == Queues.APPLIED_LIST:
            args = self.vcs.initCommand("qapplied")
        elif listType == Queues.UNAPPLIED_LIST:
            args = self.vcs.initCommand("qunapplied")
        elif listType == Queues.SERIES_LIST:
            args = self.vcs.initCommand("qseries")
        else:
            raise ValueError("illegal value for listType")
        if withSummary:
            args.append("--summary")
        
        client = self.vcs.getClient()
        output = ""
        if client:
            output = client.runcommand(args)[0]
        else:
            process = QProcess()
            process.setWorkingDirectory(repodir)
            process.start('hg', args)
            procStarted = process.waitForStarted(5000)
            if procStarted:
                finished = process.waitForFinished(30000)
                if finished and process.exitCode() == 0:
                    output = str(process.readAllStandardOutput(),
                                 self.vcs.getEncoding(), 'replace')
        
        for line in output.splitlines():
            if withSummary:
                li = line.strip().split(": ")
                if len(li) == 1:
                    patch, summary = li[0][:-1], ""
                else:
                    patch, summary = li[0], li[1]
                patchesList.append("{0}@@{1}".format(patch, summary))
            else:
                patchesList.append(line.strip())
        
        return patchesList
    
    def __getCurrentPatch(self, repodir):
        """
        Private method to get the name of the current patch.
        
        @param repodir directory name of the repository (string)
        @return name of the current patch (string)
        """
        currentPatch = ""
        
        args = self.vcs.initCommand("qtop")
        
        client = self.vcs.getClient()
        if client:
            currentPatch = client.runcommand(args)[0].strip()
        else:
            process = QProcess()
            process.setWorkingDirectory(repodir)
            process.start('hg', args)
            procStarted = process.waitForStarted(5000)
            if procStarted:
                finished = process.waitForFinished(30000)
                if finished and process.exitCode() == 0:
                    currentPatch = str(process.readAllStandardOutput(),
                                       self.vcs.getEncoding(),
                                       'replace').strip()
        
        return currentPatch
    
    def __getCommitMessage(self, repodir):
        """
        Private method to get the commit message of the current patch.
        
        @param repodir directory name of the repository (string)
        @return name of the current patch (string)
        """
        message = ""
        
        args = self.vcs.initCommand("qheader")
        
        client = self.vcs.getClient()
        if client:
            message = client.runcommand(args)[0]
        else:
            process = QProcess()
            process.setWorkingDirectory(repodir)
            process.start('hg', args)
            procStarted = process.waitForStarted(5000)
            if procStarted:
                finished = process.waitForFinished(30000)
                if finished and process.exitCode() == 0:
                    message = str(process.readAllStandardOutput(),
                                  self.vcs.getEncoding(), 'replace')
        
        return message
    
    def getGuardsList(self, repodir, allGuards=True):
        """
        Public method to get a list of all guards defined.
        
        @param repodir directory name of the repository (string)
        @param allGuards flag indicating to get all guards (boolean)
        @return sorted list of guards (list of strings)
        """
        guardsList = []
        
        args = self.vcs.initCommand("qselect")
        if allGuards:
            args.append("--series")
        
        client = self.vcs.getClient()
        output = ""
        if client:
            output = client.runcommand(args)[0]
        else:
            process = QProcess()
            process.setWorkingDirectory(repodir)
            process.start('hg', args)
            procStarted = process.waitForStarted(5000)
            if procStarted:
                finished = process.waitForFinished(30000)
                if finished and process.exitCode() == 0:
                    output = str(process.readAllStandardOutput(),
                                 self.vcs.getEncoding(), 'replace')
        
        for guard in output.splitlines():
            guard = guard.strip()
            if allGuards:
                guard = guard[1:]
            if guard not in guardsList:
                guardsList.append(guard)
        
        return sorted(guardsList)
    
    def hgQueueNewPatch(self, name):
        """
        Public method to create a new named patch.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        from .HgQueuesNewPatchDialog import HgQueuesNewPatchDialog
        dlg = HgQueuesNewPatchDialog(HgQueuesNewPatchDialog.NEW_MODE)
        if dlg.exec_() == QDialog.Accepted:
            (name, message,
             (userData, currentUser, userName),
             (dateData, currentDate, dateStr)) = dlg.getData()
            
            args = self.vcs.initCommand("qnew")
            if message != "":
                args.append("--message")
                args.append(message)
            if userData:
                if currentUser:
                    args.append("--currentuser")
                else:
                    args.append("--user")
                    args.append(userName)
            if dateData:
                if currentDate:
                    args.append("--currentdate")
                else:
                    args.append("--date")
                    args.append(dateStr)
            args.append(name)
            
            dia = HgDialog(self.tr('New Patch'), self.vcs)
            res = dia.startProcess(args, repodir)
            if res:
                dia.exec_()
                self.vcs.checkVCSStatus()
    
    def hgQueueRefreshPatch(self, name, editMessage=False):
        """
        Public method to refresh the current patch.
        
        @param name file/directory name (string)
        @param editMessage flag indicating to edit the current
            commit message (boolean)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        args = self.vcs.initCommand("qrefresh")
        
        if editMessage:
            currentMessage = self.__getCommitMessage(repodir)
            from .HgQueuesNewPatchDialog import HgQueuesNewPatchDialog
            dlg = HgQueuesNewPatchDialog(HgQueuesNewPatchDialog.REFRESH_MODE,
                                         currentMessage)
            if dlg.exec_() == QDialog.Accepted:
                (name, message,
                 (userData, currentUser, userName),
                 (dateData, currentDate, dateStr)) = dlg.getData()
                if message != "" and message != currentMessage:
                    args.append("--message")
                    args.append(message)
                if userData:
                    if currentUser:
                        args.append("--currentuser")
                    else:
                        args.append("--user")
                        args.append(userName)
                if dateData:
                    if currentDate:
                        args.append("--currentdate")
                    else:
                        args.append("--date")
                        args.append(dateStr)
            else:
                return
        
        dia = HgDialog(self.tr('Update Current Patch'), self.vcs)
        res = dia.startProcess(args, repodir)
        if res:
            dia.exec_()
            self.vcs.checkVCSStatus()
    
    def hgQueueShowPatch(self, name):
        """
        Public method to show the contents of the current patch.
        
        @param name file/directory name (string)
        """
        from ..HgDiffDialog import HgDiffDialog
        self.qdiffDialog = HgDiffDialog(self.vcs)
        self.qdiffDialog.show()
        QApplication.processEvents()
        self.qdiffDialog.start(name, qdiff=True)
    
    def hgQueueShowHeader(self, name):
        """
        Public method to show the commit message of the current patch.
        
        @param name file/directory name (string)
        """
        from .HgQueuesHeaderDialog import HgQueuesHeaderDialog
        self.qheaderDialog = HgQueuesHeaderDialog(self.vcs)
        self.qheaderDialog.show()
        QApplication.processEvents()
        self.qheaderDialog.start(name)
    
    def hgQueuePushPopPatches(self, name, operation, doAll=False, named=False,
                              force=False):
        """
        Public method to push patches onto the stack or pop patches off the
        stack.
        
        @param name file/directory name (string)
        @param operation operation type to be performed (Queues.POP,
            Queues.PUSH, Queues.GOTO)
        @keyparam doAll flag indicating to push/pop all (boolean)
        @keyparam named flag indicating to push/pop until a named patch
            is at the top of the stack (boolean)
        @keyparam force flag indicating a forceful pop (boolean)
        @return flag indicating that the project should be reread (boolean)
        @exception ValueError raised to indicate an invalid operation
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return False
        
        if operation == Queues.POP:
            args = self.vcs.initCommand("qpop")
            title = self.tr("Pop Patches")
            listType = Queues.APPLIED_LIST
        elif operation == Queues.PUSH:
            args = self.vcs.initCommand("qpush")
            title = self.tr("Push Patches")
            listType = Queues.UNAPPLIED_LIST
        elif operation == Queues.GOTO:
            args = self.vcs.initCommand("qgoto")
            title = self.tr("Go to Patch")
            listType = Queues.SERIES_LIST
        else:
            raise ValueError("illegal value for operation")
        args.append("-v")
        if force:
            args.append("--force")
        if doAll and operation in (Queues.POP, Queues.PUSH):
            args.append("--all")
        elif named or operation == Queues.GOTO:
            patchnames = self.__getPatchesList(repodir, listType)
            if patchnames:
                patch, ok = QInputDialog.getItem(
                    None,
                    self.tr("Select Patch"),
                    self.tr("Select the target patch name:"),
                    patchnames,
                    0, False)
                if ok and patch:
                    args.append(patch)
                else:
                    return False
            else:
                E5MessageBox.information(
                    None,
                    self.tr("Select Patch"),
                    self.tr("""No patches to select from."""))
                return False
        
        dia = HgDialog(title, self.vcs)
        res = dia.startProcess(args, repodir)
        if res:
            dia.exec_()
            res = dia.hasAddOrDelete()
            self.vcs.checkVCSStatus()
        return res
    
    def hgQueueListPatches(self, name):
        """
        Public method to show a list of all patches.
        
        @param name file/directory name (string)
        """
        from .HgQueuesListDialog import HgQueuesListDialog
        self.queuesListDialog = HgQueuesListDialog(self.vcs)
        self.queuesListDialog.show()
        self.queuesListDialog.start(name)
    
    def hgQueueFinishAppliedPatches(self, name):
        """
        Public method to finish all applied patches.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        args = self.vcs.initCommand("qfinish")
        args.append("--applied")
        
        dia = HgDialog(self.tr('Finish Applied Patches'), self.vcs)
        res = dia.startProcess(args, repodir)
        if res:
            dia.exec_()
            self.vcs.checkVCSStatus()
    
    def hgQueueRenamePatch(self, name):
        """
        Public method to rename the current or a selected patch.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        args = self.vcs.initCommand("qrename")
        patchnames = sorted(self.__getPatchesList(repodir, Queues.SERIES_LIST))
        if patchnames:
            currentPatch = self.__getCurrentPatch(repodir)
            if currentPatch:
                from .HgQueuesRenamePatchDialog import (
                    HgQueuesRenamePatchDialog
                )
                dlg = HgQueuesRenamePatchDialog(currentPatch, patchnames)
                if dlg.exec_() == QDialog.Accepted:
                    newName, selectedPatch = dlg.getData()
                    if selectedPatch:
                        args.append(selectedPatch)
                    args.append(newName)
                    
                    dia = HgDialog(self.tr("Rename Patch"), self.vcs)
                    res = dia.startProcess(args, repodir)
                    if res:
                        dia.exec_()
    
    def hgQueueDeletePatch(self, name):
        """
        Public method to delete a selected unapplied patch.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        args = self.vcs.initCommand("qdelete")
        patchnames = sorted(self.__getPatchesList(repodir,
                                                  Queues.UNAPPLIED_LIST))
        if patchnames:
            patch, ok = QInputDialog.getItem(
                None,
                self.tr("Select Patch"),
                self.tr("Select the patch to be deleted:"),
                patchnames,
                0, False)
            if ok and patch:
                args.append(patch)
                
                dia = HgDialog(self.tr("Delete Patch"), self.vcs)
                res = dia.startProcess(args, repodir)
                if res:
                    dia.exec_()
        else:
            E5MessageBox.information(
                None,
                self.tr("Select Patch"),
                self.tr("""No patches to select from."""))
    
    def hgQueueFoldUnappliedPatches(self, name):
        """
        Public method to fold patches into the current patch.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        args = self.vcs.initCommand("qfold")
        patchnames = sorted(
            self.__getPatchesList(repodir, Queues.UNAPPLIED_LIST,
                                  withSummary=True))
        if patchnames:
            from .HgQueuesFoldDialog import HgQueuesFoldDialog
            dlg = HgQueuesFoldDialog(patchnames)
            if dlg.exec_() == QDialog.Accepted:
                message, patchesList = dlg.getData()
                if message:
                    args.append("--message")
                    args.append(message)
                if patchesList:
                    args.extend(patchesList)
                    
                    dia = HgDialog(self.tr("Fold Patches"), self.vcs)
                    res = dia.startProcess(args, repodir)
                    if res:
                        dia.exec_()
                else:
                    E5MessageBox.information(
                        None,
                        self.tr("Fold Patches"),
                        self.tr("""No patches selected."""))
        else:
            E5MessageBox.information(
                None,
                self.tr("Fold Patches"),
                self.tr("""No patches available to be folded."""))
    
    def hgQueueGuardsList(self, name):
        """
        Public method to list the guards for the current or a named patch.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        patchnames = sorted(
            self.__getPatchesList(repodir, Queues.SERIES_LIST))
        if patchnames:
            from .HgQueuesListGuardsDialog import HgQueuesListGuardsDialog
            self.queuesListGuardsDialog = HgQueuesListGuardsDialog(
                self.vcs, patchnames)
            self.queuesListGuardsDialog.show()
            self.queuesListGuardsDialog.start(name)
        else:
            E5MessageBox.information(
                None,
                self.tr("List Guards"),
                self.tr("""No patches available to list guards for."""))
    
    def hgQueueGuardsListAll(self, name):
        """
        Public method to list all guards of all patches.
        
        @param name file/directory name (string)
        """
        from .HgQueuesListAllGuardsDialog import HgQueuesListAllGuardsDialog
        self.queuesListAllGuardsDialog = HgQueuesListAllGuardsDialog(self.vcs)
        self.queuesListAllGuardsDialog.show()
        self.queuesListAllGuardsDialog.start(name)
    
    def hgQueueGuardsDefine(self, name):
        """
        Public method to define guards for the current or a named patch.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        patchnames = sorted(
            self.__getPatchesList(repodir, Queues.SERIES_LIST))
        if patchnames:
            from .HgQueuesDefineGuardsDialog import HgQueuesDefineGuardsDialog
            self.queuesDefineGuardsDialog = HgQueuesDefineGuardsDialog(
                self.vcs, self, patchnames)
            self.queuesDefineGuardsDialog.show()
            self.queuesDefineGuardsDialog.start(name)
        else:
            E5MessageBox.information(
                None,
                self.tr("Define Guards"),
                self.tr("""No patches available to define guards for."""))
    
    def hgQueueGuardsDropAll(self, name):
        """
        Public method to drop all guards of the current or a named patch.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        patchnames = sorted(
            self.__getPatchesList(repodir, Queues.SERIES_LIST))
        if patchnames:
            patch, ok = QInputDialog.getItem(
                None,
                self.tr("Drop All Guards"),
                self.tr("Select the patch to drop guards for"
                        " (leave empty for the current patch):"),
                [""] + patchnames,
                0, False)
            if ok:
                args = self.vcs.initCommand("qguard")
                if patch:
                    args.append(patch)
                args.append("--none")
                
                client = self.vcs.getClient()
                if client:
                    client.runcommand(args)
                else:
                    process = QProcess()
                    process.setWorkingDirectory(repodir)
                    process.start('hg', args)
                    procStarted = process.waitForStarted(5000)
                    if procStarted:
                        process.waitForFinished(30000)
        else:
            E5MessageBox.information(
                None,
                self.tr("Drop All Guards"),
                self.tr("""No patches available to define guards for."""))
    
    def hgQueueGuardsSetActive(self, name):
        """
        Public method to set the active guards.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        guardsList = self.getGuardsList(repodir)
        if guardsList:
            activeGuardsList = self.getGuardsList(repodir, allGuards=False)
            from .HgQueuesGuardsSelectionDialog import (
                HgQueuesGuardsSelectionDialog
            )
            dlg = HgQueuesGuardsSelectionDialog(
                guardsList, activeGuards=activeGuardsList, listOnly=False)
            if dlg.exec_() == QDialog.Accepted:
                guards = dlg.getData()
                if guards:
                    args = self.vcs.initCommand("qselect")
                    args.extend(guards)
                    
                    dia = HgDialog(self.tr('Set Active Guards'), self.vcs)
                    res = dia.startProcess(args, repodir)
                    if res:
                        dia.exec_()
        else:
            E5MessageBox.information(
                None,
                self.tr("Set Active Guards"),
                self.tr("""No guards available to select from."""))
            return
    
    def hgQueueGuardsDeactivate(self, name):
        """
        Public method to deactivate all active guards.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        args = self.vcs.initCommand("qselect")
        args.append("--none")
        
        dia = HgDialog(self.tr('Deactivate Guards'), self.vcs)
        res = dia.startProcess(args, repodir)
        if res:
            dia.exec_()
    
    def hgQueueGuardsIdentifyActive(self, name):
        """
        Public method to list all active guards.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        guardsList = self.getGuardsList(repodir, allGuards=False)
        if guardsList:
            from .HgQueuesGuardsSelectionDialog import (
                HgQueuesGuardsSelectionDialog
            )
            dlg = HgQueuesGuardsSelectionDialog(guardsList, listOnly=True)
            dlg.exec_()
    
    def hgQueueCreateRenameQueue(self, name, isCreate):
        """
        Public method to create a new queue or rename the active queue.
        
        @param name file/directory name (string)
        @param isCreate flag indicating to create a new queue (boolean)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        if isCreate:
            title = self.tr("Create New Queue")
        else:
            title = self.tr("Rename Active Queue")
        from .HgQueuesQueueManagementDialog import (
            HgQueuesQueueManagementDialog
        )
        dlg = HgQueuesQueueManagementDialog(
            HgQueuesQueueManagementDialog.NAME_INPUT,
            title, False, repodir, self.vcs)
        if dlg.exec_() == QDialog.Accepted:
            queueName = dlg.getData()
            if queueName:
                args = self.vcs.initCommand("qqueue")
                if isCreate:
                    args.append("--create")
                else:
                    args.append("--rename")
                args.append(queueName)
                
                client = self.vcs.getClient()
                error = ""
                if client:
                    error = client.runcommand(args)[1]
                else:
                    process = QProcess()
                    process.setWorkingDirectory(repodir)
                    process.start('hg', args)
                    procStarted = process.waitForStarted(5000)
                    if procStarted:
                        finished = process.waitForFinished(30000)
                        if finished:
                            if process.exitCode() != 0:
                                error = str(process.readAllStandardError(),
                                            self.vcs.getEncoding(), 'replace')
                
                if error:
                    if isCreate:
                        errMsg = self.tr(
                            "Error while creating a new queue.")
                    else:
                        errMsg = self.tr(
                            "Error while renaming the active queue.")
                    E5MessageBox.warning(
                        None,
                        title,
                        """<p>{0}</p><p>{1}</p>""".format(errMsg, error))
                else:
                    if (
                        self.queuesListQueuesDialog is not None and
                        self.queuesListQueuesDialog.isVisible()
                    ):
                        self.queuesListQueuesDialog.refresh()
    
    def hgQueueDeletePurgeActivateQueue(self, name, operation):
        """
        Public method to delete the reference to a queue and optionally
        remove the patch directory or set the active queue.
        
        @param name file/directory name (string)
        @param operation operation to be performed (Queues.QUEUE_DELETE,
            Queues.QUEUE_PURGE, Queues.QUEUE_ACTIVATE)
        @exception ValueError raised to indicate an invalid operation
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        if operation == Queues.QUEUE_PURGE:
            title = self.tr("Purge Queue")
        elif operation == Queues.QUEUE_DELETE:
            title = self.tr("Delete Queue")
        elif operation == Queues.QUEUE_ACTIVATE:
            title = self.tr("Activate Queue")
        else:
            raise ValueError("illegal value for operation")
        
        from .HgQueuesQueueManagementDialog import (
            HgQueuesQueueManagementDialog
        )
        dlg = HgQueuesQueueManagementDialog(
            HgQueuesQueueManagementDialog.QUEUE_INPUT,
            title, True, repodir, self.vcs)
        if dlg.exec_() == QDialog.Accepted:
            queueName = dlg.getData()
            if queueName:
                args = self.vcs.initCommand("qqueue")
                if operation == Queues.QUEUE_PURGE:
                    args.append("--purge")
                elif operation == Queues.QUEUE_DELETE:
                    args.append("--delete")
                args.append(queueName)
                
                client = self.vcs.getClient()
                error = ""
                if client:
                    error = client.runcommand(args)[1]
                else:
                    process = QProcess()
                    process.setWorkingDirectory(repodir)
                    process.start('hg', args)
                    procStarted = process.waitForStarted(5000)
                    if procStarted:
                        finished = process.waitForFinished(30000)
                        if finished:
                            if process.exitCode() != 0:
                                error = str(process.readAllStandardError(),
                                            self.vcs.getEncoding(), 'replace')
                
                if error:
                    if operation == Queues.QUEUE_PURGE:
                        errMsg = self.tr("Error while purging the queue.")
                    elif operation == Queues.QUEUE_DELETE:
                        errMsg = self.tr("Error while deleting the queue.")
                    elif operation == Queues.QUEUE_ACTIVATE:
                        errMsg = self.tr(
                            "Error while setting the active queue.")
                    E5MessageBox.warning(
                        None,
                        title,
                        """<p>{0}</p><p>{1}</p>""".format(errMsg, error))
                else:
                    if (
                        self.queuesListQueuesDialog is not None and
                        self.queuesListQueuesDialog.isVisible()
                    ):
                        self.queuesListQueuesDialog.refresh()
    
    def hgQueueListQueues(self, name):
        """
        Public method to list available queues.
        
        @param name file/directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        from .HgQueuesQueueManagementDialog import (
            HgQueuesQueueManagementDialog
        )
        self.queuesListQueuesDialog = HgQueuesQueueManagementDialog(
            HgQueuesQueueManagementDialog.NO_INPUT,
            self.tr("Available Queues"),
            False, repodir, self.vcs)
        self.queuesListQueuesDialog.show()
    
    def hgQueueInit(self, name):
        """
        Public method to initialize a new queue repository.
        
        @param name directory name (string)
        """
        # find the root of the repo
        repodir = self.vcs.splitPath(name)[0]
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        args = self.vcs.initCommand("init")
        args.append('--mq')
        args.append(repodir)
        # init is not possible with the command server
        dia = HgDialog(
            self.tr('Initializing new queue repository'), self.vcs)
        res = dia.startProcess(args)
        if res:
            dia.exec_()
    
    def hgQueueStatus(self, name):
        """
        Public method used to view the status of a queue repository.
        
        @param name directory name (string)
        """
        from ..HgStatusDialog import HgStatusDialog
        self.queueStatusDialog = HgStatusDialog(self.vcs, mq=True)
        self.queueStatusDialog.show()
        self.queueStatusDialog.start(name)
