src/common/quassel.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2018 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  19  ***************************************************************************/
  20
  21 #include "quassel.h"
  22
  23 #include <algorithm>
  24 #include <iostream>
  25
  26 #include <signal.h>
  27 #if !defined Q_OS_WIN && !defined Q_OS_MAC
  28 #  include <sys/types.h>
  29 #  include <sys/time.h>
  30 #  include <sys/resource.h>
  31 #endif
  32
  33 #include <QCoreApplication>
  34 #include <QDateTime>
  35 #include <QDir>
  36 #include <QFileInfo>
  37 #include <QHostAddress>
  38 #include <QLibraryInfo>
  39 #include <QMetaEnum>
  40 #include <QSettings>
  41 #include <QTranslator>
  42 #include <QUuid>
  43
  44 #include "bufferinfo.h"
  45 #include "identity.h"
  46 #include "logger.h"
  47 #include "message.h"
  48 #include "network.h"
  49 #include "peer.h"
  50 #include "protocol.h"
  51 #include "syncableobject.h"
  52 #include "types.h"
  53
  54 #include "../../version.h"
  55
  56 Quassel *Quassel::instance()
  57 {
  58     static Quassel instance;
  59     return &instance;
  60 }
  61
  62
  63 Quassel::Quassel()
  64 {
  65 }
  66
  67
  68 bool Quassel::init()
  69 {
  70     if (instance()->_initialized)
  71         return true;  // allow multiple invocations because of MonolithicApplication
  72
  73     // Setup signal handling
  74     // TODO: Don't use unsafe methods, see handleSignal()
  75
  76     // We catch SIGTERM and SIGINT (caused by Ctrl+C) to graceful shutdown Quassel.
  77     signal(SIGTERM, handleSignal);
  78     signal(SIGINT, handleSignal);
  79 #ifndef Q_OS_WIN
  80     // SIGHUP is used to reload configuration (i.e. SSL certificates)
  81     // Windows does not support SIGHUP
  82     signal(SIGHUP, handleSignal);
  83 #endif
  84
  85     if (instance()->_handleCrashes) {
  86         // we have crashhandler for win32 and unix (based on execinfo).
  87 #if defined(Q_OS_WIN) || defined(HAVE_EXECINFO)
  88 # ifndef Q_OS_WIN
  89         // we only handle crashes ourselves if coredumps are disabled
  90         struct rlimit *limit = (rlimit *)malloc(sizeof(struct rlimit));
  91         int rc = getrlimit(RLIMIT_CORE, limit);
  92
  93         if (rc == -1 || !((long)limit->rlim_cur > 0 || limit->rlim_cur == RLIM_INFINITY)) {
  94 # endif /* Q_OS_WIN */
  95             signal(SIGABRT, handleSignal);
  96             signal(SIGSEGV, handleSignal);
  97 # ifndef Q_OS_WIN
  98             signal(SIGBUS, handleSignal);
  99         }
 100         free(limit);
 101 # endif /* Q_OS_WIN */
 102 #endif /* Q_OS_WIN || HAVE_EXECINFO */
 103     }
 104
 105     instance()->_initialized = true;
 106     qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
 107
 108     instance()->setupEnvironment();
 109     instance()->registerMetaTypes();
 110
 111     Network::setDefaultCodecForServer("UTF-8");
 112     Network::setDefaultCodecForEncoding("UTF-8");
 113     Network::setDefaultCodecForDecoding("ISO-8859-15");
 114
 115     if (isOptionSet("help")) {
 116         instance()->_cliParser->usage();
 117         return false;
 118     }
 119
 120     if (isOptionSet("version")) {
 121         std::cout << qPrintable("Quassel IRC: " + Quassel::buildInfo().plainVersionString) << std::endl;
 122         return false;
 123     }
 124
 125     // Set up logging
 126     if (isOptionSet("loglevel")) {
 127         QString level = optionValue("loglevel").toLower();
 128
 129         if (level == "debug")
 130             setLogLevel(DebugLevel);
 131         else if (level == "info")
 132             setLogLevel(InfoLevel);
 133         else if (level == "warning")
 134             setLogLevel(WarningLevel);
 135         else if (level == "error")
 136             setLogLevel(ErrorLevel);
 137         else {
 138             qWarning() << qPrintable(tr("Invalid log level %1; supported are Debug|Info|Warning|Error").arg(level));
 139             return false;
 140         }
 141     }
 142
 143     QString logfilename = optionValue("logfile");
 144     if (!logfilename.isEmpty()) {
 145         instance()->_logFile.reset(new QFile{logfilename});
 146         if (!logFile()->open(QIODevice::Append | QIODevice::Text)) {
 147             qWarning() << qPrintable(tr("Could not open log file \"%1\": %2").arg(logfilename, logFile()->errorString()));
 148             instance()->_logFile.reset();
 149         }
 150     }
 151 #ifdef HAVE_SYSLOG
 152     instance()->_logToSyslog = isOptionSet("syslog");
 153 #endif
 154
 155 #if QT_VERSION < 0x050000
 156     qInstallMsgHandler(Logger::logMessage);
 157 #else
 158     qInstallMessageHandler(Logger::logMessage);
 159 #endif
 160
 161     return true;
 162 }
 163
 164
 165 void Quassel::destroy()
 166 {
 167     if (logFile()) {
 168         logFile()->close();
 169         instance()->_logFile.reset();
 170     }
 171 }
 172
 173
 174 void Quassel::registerQuitHandler(QuitHandler handler)
 175 {
 176     instance()->_quitHandlers.emplace_back(std::move(handler));
 177 }
 178
 179 void Quassel::quit()
 180 {
 181     if (_quitHandlers.empty()) {
 182         QCoreApplication::quit();
 183     }
 184     else {
 185         for (auto &&handler : _quitHandlers) {
 186             handler();
 187         }
 188     }
 189 }
 190
 191
 192 void Quassel::registerReloadHandler(ReloadHandler handler)
 193 {
 194     instance()->_reloadHandlers.emplace_back(std::move(handler));
 195 }
 196
 197
 198 bool Quassel::reloadConfig()
 199 {
 200     bool result{true};
 201     for (auto &&handler : _reloadHandlers) {
 202         result = result && handler();
 203     }
 204     return result;
 205 }
 206
 207
 208 //! Register our custom types with Qt's Meta Object System.
 209 /**  This makes them available for QVariant and in signals/slots, among other things.
 210 *
 211 */
 212 void Quassel::registerMetaTypes()
 213 {
 214     // Complex types
 215     qRegisterMetaType<Message>("Message");
 216     qRegisterMetaType<BufferInfo>("BufferInfo");
 217     qRegisterMetaType<NetworkInfo>("NetworkInfo");
 218     qRegisterMetaType<Network::Server>("Network::Server");
 219     qRegisterMetaType<Identity>("Identity");
 220
 221     qRegisterMetaTypeStreamOperators<Message>("Message");
 222     qRegisterMetaTypeStreamOperators<BufferInfo>("BufferInfo");
 223     qRegisterMetaTypeStreamOperators<NetworkInfo>("NetworkInfo");
 224     qRegisterMetaTypeStreamOperators<Network::Server>("Network::Server");
 225     qRegisterMetaTypeStreamOperators<Identity>("Identity");
 226
 227     qRegisterMetaType<IdentityId>("IdentityId");
 228     qRegisterMetaType<BufferId>("BufferId");
 229     qRegisterMetaType<NetworkId>("NetworkId");
 230     qRegisterMetaType<UserId>("UserId");
 231     qRegisterMetaType<AccountId>("AccountId");
 232     qRegisterMetaType<MsgId>("MsgId");
 233
 234     qRegisterMetaType<QHostAddress>("QHostAddress");
 235     qRegisterMetaTypeStreamOperators<QHostAddress>("QHostAddress");
 236     qRegisterMetaType<QUuid>("QUuid");
 237     qRegisterMetaTypeStreamOperators<QUuid>("QUuid");
 238
 239     qRegisterMetaTypeStreamOperators<IdentityId>("IdentityId");
 240     qRegisterMetaTypeStreamOperators<BufferId>("BufferId");
 241     qRegisterMetaTypeStreamOperators<NetworkId>("NetworkId");
 242     qRegisterMetaTypeStreamOperators<UserId>("UserId");
 243     qRegisterMetaTypeStreamOperators<AccountId>("AccountId");
 244     qRegisterMetaTypeStreamOperators<MsgId>("MsgId");
 245
 246     qRegisterMetaType<Protocol::SessionState>("Protocol::SessionState");
 247     qRegisterMetaType<PeerPtr>("PeerPtr");
 248     qRegisterMetaTypeStreamOperators<PeerPtr>("PeerPtr");
 249
 250     // Versions of Qt prior to 4.7 didn't define QVariant as a meta type
 251     if (!QMetaType::type("QVariant")) {
 252         qRegisterMetaType<QVariant>("QVariant");
 253         qRegisterMetaTypeStreamOperators<QVariant>("QVariant");
 254     }
 255 }
 256
 257
 258 void Quassel::setupEnvironment()
 259 {
 260     // On modern Linux systems, XDG_DATA_DIRS contains a list of directories containing application data. This
 261     // is, for example, used by Qt for finding icons and other things. In case Quassel is installed in a non-standard
 262     // prefix (or run from the build directory), it makes sense to add this to XDG_DATA_DIRS so we don't have to
 263     // hack extra search paths into various places.
 264 #ifdef Q_OS_UNIX
 265     QString xdgDataVar = QFile::decodeName(qgetenv("XDG_DATA_DIRS"));
 266     if (xdgDataVar.isEmpty())
 267         xdgDataVar = QLatin1String("/usr/local/share:/usr/share"); // sane defaults
 268
 269     QStringList xdgDirs = xdgDataVar.split(QLatin1Char(':'), QString::SkipEmptyParts);
 270
 271     // Add our install prefix (if we're not in a bindir, this just adds the current workdir)
 272     QString appDir = QCoreApplication::applicationDirPath();
 273     int binpos = appDir.lastIndexOf("/bin");
 274     if (binpos >= 0) {
 275         appDir.replace(binpos, 4, "/share");
 276         xdgDirs.append(appDir);
 277         // Also append apps/quassel, this is only for QIconLoader to find icons there
 278         xdgDirs.append(appDir + "/apps/quassel");
 279     } else
 280         xdgDirs.append(appDir);  // build directory is always the last fallback
 281
 282     xdgDirs.removeDuplicates();
 283
 284     qputenv("XDG_DATA_DIRS", QFile::encodeName(xdgDirs.join(":")));
 285 #endif
 286 }
 287
 288
 289 void Quassel::setupBuildInfo()
 290 {
 291     BuildInfo buildInfo;
 292     buildInfo.applicationName = "quassel";
 293     buildInfo.coreApplicationName = "quasselcore";
 294     buildInfo.clientApplicationName = "quasselclient";
 295     buildInfo.organizationName = "Quassel Project";
 296     buildInfo.organizationDomain = "quassel-irc.org";
 297
 298     buildInfo.protocolVersion = 10; // FIXME: deprecated, will be removed
 299
 300     buildInfo.baseVersion = QUASSEL_VERSION_STRING;
 301     buildInfo.generatedVersion = GIT_DESCRIBE;
 302
 303     // Check if we got a commit hash
 304     if (!QString(GIT_HEAD).isEmpty()) {
 305         buildInfo.commitHash = GIT_HEAD;
 306         // Set to Unix epoch, wrapped as a string for backwards-compatibility
 307         buildInfo.commitDate = QString::number(GIT_COMMIT_DATE);
 308     }
 309     else if (!QString(DIST_HASH).contains("Format")) {
 310         buildInfo.commitHash = DIST_HASH;
 311         // Leave as Unix epoch if set as Unix epoch, but don't force this for
 312         // backwards-compatibility with existing packaging/release tools that might set strings.
 313         buildInfo.commitDate = QString(DIST_DATE);
 314     }
 315
 316     // create a nice version string
 317     if (buildInfo.generatedVersion.isEmpty()) {
 318         if (!buildInfo.commitHash.isEmpty()) {
 319             // dist version
 320             buildInfo.plainVersionString = QString{"v%1 (dist-%2)"}
 321                                                .arg(buildInfo.baseVersion)
 322                                                .arg(buildInfo.commitHash.left(7));
 323             buildInfo.fancyVersionString = QString{"v%1 (dist-<a href=\"https://github.com/quassel/quassel/commit/%3\">%2</a>)"}
 324                                                .arg(buildInfo.baseVersion)
 325                                                .arg(buildInfo.commitHash.left(7))
 326                                                .arg(buildInfo.commitHash);
 327         }
 328         else {
 329             // we only have a base version :(
 330             buildInfo.plainVersionString = QString{"v%1 (unknown revision)"}.arg(buildInfo.baseVersion);
 331         }
 332     }
 333     else {
 334         // analyze what we got from git-describe
 335         static const QRegExp rx{"(.*)-(\\d+)-g([0-9a-f]+)(-dirty)?$"};
 336         if (rx.exactMatch(buildInfo.generatedVersion)) {
 337             QString distance = rx.cap(2) == "0" ? QString{} : QString{"%1+%2 "}.arg(rx.cap(1), rx.cap(2));
 338             buildInfo.plainVersionString = QString{"v%1 (%2git-%3%4)"}.arg(buildInfo.baseVersion, distance, rx.cap(3), rx.cap(4));
 339             if (!buildInfo.commitHash.isEmpty()) {
 340                 buildInfo.fancyVersionString = QString{"v%1 (%2git-<a href=\"https://github.com/quassel/quassel/commit/%5\">%3</a>%4)"}
 341                                                    .arg(buildInfo.baseVersion, distance, rx.cap(3), rx.cap(4), buildInfo.commitHash);
 342             }
 343         }
 344         else {
 345             buildInfo.plainVersionString = QString{"v%1 (invalid revision)"}.arg(buildInfo.baseVersion);
 346         }
 347     }
 348     if (buildInfo.fancyVersionString.isEmpty()) {
 349         buildInfo.fancyVersionString = buildInfo.plainVersionString;
 350     }
 351
 352     instance()->_buildInfo = std::move(buildInfo);
 353 }
 354
 355
 356 const Quassel::BuildInfo &Quassel::buildInfo()
 357 {
 358     return instance()->_buildInfo;
 359 }
 360
 361
 362 //! Signal handler for graceful shutdown.
 363 //! @todo: Ensure this doesn't use unsafe methods (it does currently)
 364 //!        cf. QSocketNotifier, UnixSignalWatcher
 365 void Quassel::handleSignal(int sig)
 366 {
 367     switch (sig) {
 368     case SIGTERM:
 369     case SIGINT:
 370         qWarning("%s", qPrintable(QString("Caught signal %1 - exiting.").arg(sig)));
 371         instance()->quit();
 372         break;
 373 #ifndef Q_OS_WIN
 374 // Windows does not support SIGHUP
 375     case SIGHUP:
 376         // Most applications use this as the 'configuration reload' command, e.g. nginx uses it for
 377         // graceful reloading of processes.
 378         quInfo() << "Caught signal" << SIGHUP << "- reloading configuration";
 379         if (instance()->reloadConfig()) {
 380             quInfo() << "Successfully reloaded configuration";
 381         }
 382         break;
 383 #endif
 384     case SIGABRT:
 385     case SIGSEGV:
 386 #ifndef Q_OS_WIN
 387     case SIGBUS:
 388 #endif
 389         instance()->logBacktrace(instance()->coreDumpFileName());
 390         exit(EXIT_FAILURE);
 391     default:
 392         ;
 393     }
 394 }
 395
 396
 397 void Quassel::disableCrashHandler()
 398 {
 399     instance()->_handleCrashes = false;
 400 }
 401
 402
 403 Quassel::RunMode Quassel::runMode() {
 404     return instance()->_runMode;
 405 }
 406
 407
 408 void Quassel::setRunMode(RunMode runMode)
 409 {
 410     instance()->_runMode = runMode;
 411 }
 412
 413
 414 void Quassel::setCliParser(std::shared_ptr<AbstractCliParser> parser)
 415 {
 416     instance()->_cliParser = std::move(parser);
 417 }
 418
 419
 420 QString Quassel::optionValue(const QString &key)
 421 {
 422     return instance()->_cliParser ? instance()->_cliParser->value(key) : QString{};
 423 }
 424
 425
 426 bool Quassel::isOptionSet(const QString &key)
 427 {
 428     return instance()->_cliParser ? instance()->_cliParser->isSet(key) : false;
 429 }
 430
 431
 432 Quassel::LogLevel Quassel::logLevel()
 433 {
 434     return instance()->_logLevel;
 435 }
 436
 437
 438 void Quassel::setLogLevel(LogLevel logLevel)
 439 {
 440     instance()->_logLevel = logLevel;
 441 }
 442
 443
 444 QFile *Quassel::logFile() {
 445     return instance()->_logFile.get();
 446 }
 447
 448
 449 bool Quassel::logToSyslog()
 450 {
 451     return instance()->_logToSyslog;
 452 }
 453
 454
 455 void Quassel::logFatalMessage(const char *msg)
 456 {
 457 #ifdef Q_OS_MAC
 458     Q_UNUSED(msg)
 459 #else
 460     QFile dumpFile(instance()->coreDumpFileName());
 461     dumpFile.open(QIODevice::Append);
 462     QTextStream dumpStream(&dumpFile);
 463
 464     dumpStream << "Fatal: " << msg << '\n';
 465     dumpStream.flush();
 466     dumpFile.close();
 467 #endif
 468 }
 469
 470
 471 const QString &Quassel::coreDumpFileName()
 472 {
 473     if (_coreDumpFileName.isEmpty()) {
 474         QDir configDir(configDirPath());
 475         _coreDumpFileName = configDir.absoluteFilePath(QString("Quassel-Crash-%1.log").arg(QDateTime::currentDateTime().toString("yyyyMMdd-hhmm")));
 476         QFile dumpFile(_coreDumpFileName);
 477         dumpFile.open(QIODevice::Append);
 478         QTextStream dumpStream(&dumpFile);
 479         dumpStream << "Quassel IRC: " << _buildInfo.baseVersion << ' ' << _buildInfo.commitHash << '\n';
 480         qDebug() << "Quassel IRC: " << _buildInfo.baseVersion << ' ' << _buildInfo.commitHash;
 481         dumpStream.flush();
 482         dumpFile.close();
 483     }
 484     return _coreDumpFileName;
 485 }
 486
 487
 488 QString Quassel::configDirPath()
 489 {
 490     if (!instance()->_configDirPath.isEmpty())
 491         return instance()->_configDirPath;
 492
 493     QString path;
 494     if (isOptionSet("datadir")) {
 495         qWarning() << "Obsolete option --datadir used!";
 496         path = Quassel::optionValue("datadir");
 497     }
 498     else if (isOptionSet("configdir")) {
 499         path = Quassel::optionValue("configdir");
 500     }
 501     else {
 502 #ifdef Q_OS_MAC
 503         // On Mac, the path is always the same
 504         path = QDir::homePath() + "/Library/Application Support/Quassel/";
 505 #else
 506         // We abuse QSettings to find us a sensible path on the other platforms
 507 #  ifdef Q_OS_WIN
 508         // don't use the registry
 509         QSettings::Format format = QSettings::IniFormat;
 510 #  else
 511         QSettings::Format format = QSettings::NativeFormat;
 512 #  endif
 513         QSettings s(format, QSettings::UserScope, QCoreApplication::organizationDomain(), buildInfo().applicationName);
 514         QFileInfo fileInfo(s.fileName());
 515         path = fileInfo.dir().absolutePath();
 516 #endif /* Q_OS_MAC */
 517     }
 518
 519     path = QFileInfo{path}.absoluteFilePath();
 520
 521     if (!path.endsWith(QDir::separator()) && !path.endsWith('/'))
 522         path += QDir::separator();
 523
 524     QDir qDir{path};
 525     if (!qDir.exists(path)) {
 526         if (!qDir.mkpath(path)) {
 527             qCritical() << "Unable to create Quassel config directory:" << qPrintable(qDir.absolutePath());
 528             return {};
 529         }
 530     }
 531
 532     instance()->_configDirPath = path;
 533     return path;
 534 }
 535
 536
 537 void Quassel::setDataDirPaths(const QStringList &paths) {
 538     instance()->_dataDirPaths = paths;
 539 }
 540
 541
 542 QStringList Quassel::dataDirPaths()
 543 {
 544     return instance()->_dataDirPaths;
 545 }
 546
 547
 548 QStringList Quassel::findDataDirPaths()
 549 {
 550     // TODO Qt5
 551     // We don't use QStandardPaths for now, as we still need to provide fallbacks for Qt4 and
 552     // want to stay consistent.
 553
 554     QStringList dataDirNames;
 555 #ifdef Q_OS_WIN
 556     dataDirNames << qgetenv("APPDATA") + QCoreApplication::organizationDomain() + "/share/apps/quassel/"
 557                  << qgetenv("APPDATA") + QCoreApplication::organizationDomain()
 558                  << QCoreApplication::applicationDirPath();
 559 #elif defined Q_OS_MAC
 560     dataDirNames << QDir::homePath() + "/Library/Application Support/Quassel/"
 561                  << QCoreApplication::applicationDirPath();
 562 #else
 563     // Linux et al
 564
 565     // XDG_DATA_HOME is the location for users to override system-installed files, usually in .local/share
 566     // This should thus come first.
 567     QString xdgDataHome = QFile::decodeName(qgetenv("XDG_DATA_HOME"));
 568     if (xdgDataHome.isEmpty())
 569         xdgDataHome = QDir::homePath() + QLatin1String("/.local/share");
 570     dataDirNames << xdgDataHome;
 571
 572     // Now whatever is configured through XDG_DATA_DIRS
 573     QString xdgDataDirs = QFile::decodeName(qgetenv("XDG_DATA_DIRS"));
 574     if (xdgDataDirs.isEmpty())
 575         dataDirNames << "/usr/local/share" << "/usr/share";
 576     else
 577         dataDirNames << xdgDataDirs.split(':', QString::SkipEmptyParts);
 578
 579     // Just in case, also check our install prefix
 580     dataDirNames << QCoreApplication::applicationDirPath() + "/../share";
 581
 582     // Normalize and append our application name
 583     for (int i = 0; i < dataDirNames.count(); i++)
 584         dataDirNames[i] = QDir::cleanPath(dataDirNames.at(i)) + "/quassel/";
 585
 586 #endif
 587
 588     // Add resource path and workdir just in case.
 589     // Workdir should have precedence
 590     dataDirNames.prepend(QCoreApplication::applicationDirPath() + "/data/");
 591     dataDirNames.append(":/data/");
 592
 593     // Append trailing '/' and check for existence
 594     auto iter = dataDirNames.begin();
 595     while (iter != dataDirNames.end()) {
 596         if (!iter->endsWith(QDir::separator()) && !iter->endsWith('/'))
 597             iter->append(QDir::separator());
 598         if (!QFile::exists(*iter))
 599             iter = dataDirNames.erase(iter);
 600         else
 601             ++iter;
 602     }
 603
 604     dataDirNames.removeDuplicates();
 605
 606     return dataDirNames;
 607 }
 608
 609
 610 QString Quassel::findDataFilePath(const QString &fileName)
 611 {
 612     QStringList dataDirs = dataDirPaths();
 613     foreach(QString dataDir, dataDirs) {
 614         QString path = dataDir + fileName;
 615         if (QFile::exists(path))
 616             return path;
 617     }
 618     return QString();
 619 }
 620
 621
 622 QStringList Quassel::scriptDirPaths()
 623 {
 624     QStringList res(configDirPath() + "scripts/");
 625     foreach(QString path, dataDirPaths())
 626     res << path + "scripts/";
 627     return res;
 628 }
 629
 630
 631 QString Quassel::translationDirPath()
 632 {
 633     if (instance()->_translationDirPath.isEmpty()) {
 634         // We support only one translation dir; fallback mechanisms wouldn't work else.
 635         // This means that if we have a $data/translations dir, the internal :/i18n resource won't be considered.
 636         foreach(const QString &dir, dataDirPaths()) {
 637             if (QFile::exists(dir + "translations/")) {
 638                 instance()->_translationDirPath = dir + "translations/";
 639                 break;
 640             }
 641         }
 642         if (instance()->_translationDirPath.isEmpty())
 643             instance()->_translationDirPath = ":/i18n/";
 644     }
 645     return instance()->_translationDirPath;
 646 }
 647
 648
 649 void Quassel::loadTranslation(const QLocale &locale)
 650 {
 651     QTranslator *qtTranslator = QCoreApplication::instance()->findChild<QTranslator *>("QtTr");
 652     QTranslator *quasselTranslator = QCoreApplication::instance()->findChild<QTranslator *>("QuasselTr");
 653
 654     if (qtTranslator)
 655         qApp->removeTranslator(qtTranslator);
 656     if (quasselTranslator)
 657         qApp->removeTranslator(quasselTranslator);
 658
 659     // We use QLocale::C to indicate that we don't want a translation
 660     if (locale.language() == QLocale::C)
 661         return;
 662
 663     qtTranslator = new QTranslator(qApp);
 664     qtTranslator->setObjectName("QtTr");
 665     qApp->installTranslator(qtTranslator);
 666
 667     quasselTranslator = new QTranslator(qApp);
 668     quasselTranslator->setObjectName("QuasselTr");
 669     qApp->installTranslator(quasselTranslator);
 670
 671 #if QT_VERSION >= 0x040800 && !defined Q_OS_MAC
 672     bool success = qtTranslator->load(locale, QString("qt_"), translationDirPath());
 673     if (!success)
 674         qtTranslator->load(locale, QString("qt_"), QLibraryInfo::location(QLibraryInfo::TranslationsPath));
 675     quasselTranslator->load(locale, QString(""), translationDirPath());
 676 #else
 677     bool success = qtTranslator->load(QString("qt_%1").arg(locale.name()), translationDirPath());
 678     if (!success)
 679         qtTranslator->load(QString("qt_%1").arg(locale.name()), QLibraryInfo::location(QLibraryInfo::TranslationsPath));
 680     quasselTranslator->load(QString("%1").arg(locale.name()), translationDirPath());
 681 #endif
 682 }
 683
 684
 685 // ---- Quassel::Features ---------------------------------------------------------------------------------------------
 686
 687 Quassel::Features::Features()
 688 {
 689     QStringList features;
 690
 691     // TODO Qt5: Use QMetaEnum::fromType()
 692     auto featureEnum = Quassel::staticMetaObject.enumerator(Quassel::staticMetaObject.indexOfEnumerator("Feature"));
 693     _features.resize(featureEnum.keyCount(), true);  // enable all known features to true
 694 }
 695
 696
 697 Quassel::Features::Features(const QStringList &features, LegacyFeatures legacyFeatures)
 698 {
 699     // TODO Qt5: Use QMetaEnum::fromType()
 700     auto featureEnum = Quassel::staticMetaObject.enumerator(Quassel::staticMetaObject.indexOfEnumerator("Feature"));
 701     _features.resize(featureEnum.keyCount(), false);
 702
 703     for (auto &&feature : features) {
 704         int i = featureEnum.keyToValue(qPrintable(feature));
 705         if (i >= 0) {
 706             _features[i] = true;
 707         }
 708         else {
 709             _unknownFeatures << feature;
 710         }
 711     }
 712
 713     if (legacyFeatures) {
 714         // TODO Qt5: Use QMetaEnum::fromType()
 715         auto legacyFeatureEnum = Quassel::staticMetaObject.enumerator(Quassel::staticMetaObject.indexOfEnumerator("LegacyFeature"));
 716         for (quint32 mask = 0x0001; mask <= 0x8000; mask <<=1) {
 717             if (static_cast<quint32>(legacyFeatures) & mask) {
 718                 int i = featureEnum.keyToValue(legacyFeatureEnum.valueToKey(mask));
 719                 if (i >= 0) {
 720                     _features[i] = true;
 721                 }
 722             }
 723         }
 724     }
 725 }
 726
 727
 728 bool Quassel::Features::isEnabled(Feature feature) const
 729 {
 730     size_t i = static_cast<size_t>(feature);
 731     return i < _features.size() ? _features[i] : false;
 732 }
 733
 734
 735 QStringList Quassel::Features::toStringList(bool enabled) const
 736 {
 737     // Check if any feature is enabled
 738     if (!enabled && std::all_of(_features.cbegin(), _features.cend(), [](bool feature) { return !feature; })) {
 739         return QStringList{} << "NoFeatures";
 740     }
 741
 742     QStringList result;
 743
 744     // TODO Qt5: Use QMetaEnum::fromType()
 745     auto featureEnum = Quassel::staticMetaObject.enumerator(Quassel::staticMetaObject.indexOfEnumerator("Feature"));
 746     for (quint32 i = 0; i < _features.size(); ++i) {
 747         if (_features[i] == enabled) {
 748             result << featureEnum.key(i);
 749         }
 750     }
 751     return result;
 752 }
 753
 754
 755 Quassel::LegacyFeatures Quassel::Features::toLegacyFeatures() const
 756 {
 757     // TODO Qt5: Use LegacyFeatures (flag operators for enum classes not supported in Qt4)
 758     quint32 result{0};
 759     // TODO Qt5: Use QMetaEnum::fromType()
 760     auto featureEnum = Quassel::staticMetaObject.enumerator(Quassel::staticMetaObject.indexOfEnumerator("Feature"));
 761     auto legacyFeatureEnum = Quassel::staticMetaObject.enumerator(Quassel::staticMetaObject.indexOfEnumerator("LegacyFeature"));
 762
 763     for (quint32 i = 0; i < _features.size(); ++i) {
 764         if (_features[i]) {
 765             int v = legacyFeatureEnum.keyToValue(featureEnum.key(i));
 766             if (v >= 0) {
 767                 result |= v;
 768             }
 769         }
 770     }
 771     return static_cast<LegacyFeatures>(result);
 772 }
 773
 774
 775 QStringList Quassel::Features::unknownFeatures() const
 776 {
 777     return _unknownFeatures;
 778 }