/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the tools applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** information use the contact form at http://www.qt.io/contact-us.
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** $QT_END_LICENSE$
**
****************************************************************************/

#include <qglobal.h>
#include <stdlib.h>
#include "codemarker.h"
#include "codeparser.h"
#include "config.h"
#include "cppcodemarker.h"
#include "cppcodeparser.h"
#include "doc.h"
#include "htmlgenerator.h"
#include "location.h"
#include "plaincodemarker.h"
#include "puredocparser.h"
#include "tokenizer.h"
#include "tree.h"
#include "qdocdatabase.h"
#include "jscodemarker.h"
#include "qmlcodemarker.h"
#include "qmlcodeparser.h"
#include <qdatetime.h>
#include <qdebug.h>
#include "qtranslator.h"
#ifndef QT_BOOTSTRAPPED
#  include "qcoreapplication.h"
#endif
#include "qcommandlineoption.h"
#include "qcommandlineparser.h"

#include <algorithm>

QT_BEGIN_NAMESPACE

bool creationTimeBefore(const QFileInfo &fi1, const QFileInfo &fi2)
{
    return fi1.lastModified() < fi2.lastModified();
}

static bool highlighting = false;
static bool showInternal = false;
static bool singleExec = false;
static bool writeQaPages = false;
static bool redirectDocumentationToDevNull = false;
static bool noLinkErrors = false;
static bool autolinkErrors = false;
static bool obsoleteLinks = false;
static QStringList defines;
static QStringList dependModules;
static QStringList indexDirs;
static QString currentDir;
static QString prevCurrentDir;
static QHash<QString,QString> defaults;
#ifndef QT_NO_TRANSLATION
typedef QPair<QString, QTranslator*> Translator;
static QList<Translator> translators;
#endif

/*!
  Read some XML indexes containing definitions from other
  documentation sets. \a config contains a variable that
  lists directories where index files can bge found. It also
  contains the \c depends variable, which lists the modules
  that the current module depends on.
*/
static void loadIndexFiles(Config& config)
{
    QDocDatabase* qdb = QDocDatabase::qdocDB();
    QStringList indexFiles;
    QStringList configIndexes = config.getStringList(CONFIG_INDEXES);
    foreach (const QString &index, configIndexes) {
        QFileInfo fi(index);
        if (fi.exists() && fi.isFile())
            indexFiles << index;
        else
            Location::null.warning(QString("Index file not found: %1").arg(index));
    }

    dependModules += config.getStringList(CONFIG_DEPENDS);
    dependModules.removeDuplicates();

    bool noOutputSubdirs = false;
    QString singleOutputSubdir;
    if (config.getBool(QString("HTML.nosubdirs"))) {
        noOutputSubdirs = true;
        singleOutputSubdir = config.getString("HTML.outputsubdir");
        if (singleOutputSubdir.isEmpty())
            singleOutputSubdir = "html";
    }

    if (dependModules.size() > 0) {
        if (indexDirs.size() > 0) {
            for (int i = 0; i < indexDirs.size(); i++) {
                if (indexDirs[i].startsWith("..")) {
                    const QString prefix(QDir(currentDir).relativeFilePath(prevCurrentDir));
                    if (!prefix.isEmpty())
                        indexDirs[i].prepend(prefix + QLatin1Char('/'));
                }
            }
            /*
              Add all subdirectories of the indexdirs as dependModules,
              when an asterisk is used in the 'depends' list.
            */
            if (dependModules.contains("*")) {
                dependModules.removeOne("*");
                for (int i = 0; i < indexDirs.size(); i++) {
                    QDir scanDir = QDir(indexDirs[i]);
                    scanDir.setFilter(QDir::Dirs | QDir::NoDotAndDotDot);
                    QFileInfoList dirList = scanDir.entryInfoList();
                    for (int j = 0; j < dirList.size(); j++) {
                        if (dirList[j].fileName().toLower() != config.getString(CONFIG_PROJECT).toLower())
                            dependModules.append(dirList[j].fileName());
                    }
                }
            }
            for (int i = 0; i < dependModules.size(); i++) {
                QString indexToAdd;
                QList<QFileInfo> foundIndices;
                for (int j = 0; j < indexDirs.size(); j++) {
                    QString fileToLookFor = indexDirs[j] + QLatin1Char('/');
                    if (noOutputSubdirs)
                        fileToLookFor += singleOutputSubdir + QLatin1Char('/');
                    else
                        fileToLookFor += dependModules[i] + QLatin1Char('/');
                    fileToLookFor += dependModules[i] + QLatin1String(".index");
                    if (QFile::exists(fileToLookFor)) {
                        QFileInfo tempFileInfo(fileToLookFor);
                        if (!foundIndices.contains(tempFileInfo))
                            foundIndices.append(tempFileInfo);
                    }
                }
                std::sort(foundIndices.begin(), foundIndices.end(), creationTimeBefore);
                if (foundIndices.size() > 1) {
                    /*
                        QDoc should always use the last entry in the multimap when there are
                        multiple index files for a module, since the last modified file has the
                        highest UNIX timestamp.
                    */
                    QStringList indexPaths;
                    for (int k = 0; k < foundIndices.size(); k++)
                        indexPaths << foundIndices[k].absoluteFilePath();
                    Location::null.warning(QString("Multiple index files found for dependency \"%1\":\n%2").arg(
                                               dependModules[i], indexPaths.join('\n')));
                    Location::null.warning(QString("Using %1 as index file for dependency \"%2\"").arg(
                                               foundIndices[foundIndices.size() - 1].absoluteFilePath(),
                                               dependModules[i]));
                    indexToAdd = foundIndices[foundIndices.size() - 1].absoluteFilePath();
                }
                else if (foundIndices.size() == 1) {
                    indexToAdd = foundIndices[0].absoluteFilePath();
                }
                if (!indexToAdd.isEmpty()) {
                    if (!indexFiles.contains(indexToAdd))
                        indexFiles << indexToAdd;
                }
                else {
                    Location::null.warning(QString("\"%1\" Cannot locate index file for dependency \"%2\"").arg(
                                               config.getString(CONFIG_PROJECT), dependModules[i]));
                }
            }
        }
        else {
            Location::null.warning(QLatin1String("Dependent modules specified, but no index directories were set. There will probably be errors for missing links."));
        }
    }
    qdb->readIndexes(indexFiles);
}

/*!
  Processes the qdoc config file \a fileName. This is the
  controller for all of qdoc.
 */
static void processQdocconfFile(const QString &fileName)
{
    /*
      The Config instance represents the configuration data for qdoc.
      All the other classes are initialized with the config. Below, we
      initialize the configuration with some default values.

      I don't think the call to translate() does anything here. For one
      thing, the translators haven't been installed at this point. And
      I doubt any translator would translate QDoc anyway. But I left it
      here because it does no harm.
     */
    Config config(QCoreApplication::translate("QDoc", "qdoc"));

    QHash<QString,QString>::iterator iter;
    for (iter = defaults.begin(); iter != defaults.end(); ++iter)
        config.setStringList(iter.key(), QStringList() << iter.value());

    config.setStringList(CONFIG_SYNTAXHIGHLIGHTING, QStringList(highlighting ? "true" : "false"));
    config.setStringList(CONFIG_SHOWINTERNAL, QStringList(showInternal ? "true" : "false"));
    config.setStringList(CONFIG_SINGLEEXEC, QStringList(singleExec ? "true" : "false"));
    config.setStringList(CONFIG_WRITEQAPAGES, QStringList(writeQaPages ? "true" : "false"));
    config.setStringList(CONFIG_REDIRECTDOCUMENTATIONTODEVNULL, QStringList(redirectDocumentationToDevNull ? "true" : "false"));
    config.setStringList(CONFIG_NOLINKERRORS, QStringList(noLinkErrors ? "true" : "false"));
    config.setStringList(CONFIG_AUTOLINKERRORS, QStringList(autolinkErrors ? "true" : "false"));
    config.setStringList(CONFIG_OBSOLETELINKS, QStringList(obsoleteLinks ? "true" : "false"));

    /*
      With the default configuration values in place, load
      the qdoc configuration file. Note that the configuration
      file may include other configuration files.

      The Location class keeps track of the current location
      in the file being processed, mainly for error reporting
      purposes.
     */
    currentDir = QFileInfo(fileName).path();
    Location::initialize(config);
    config.load(fileName);
    QString project = config.getString(CONFIG_PROJECT);
    //qDebug() << "Start project:" << project;
    /*
      Add the defines to the configuration variables.
     */
    QStringList defs = defines + config.getStringList(CONFIG_DEFINES);
    config.setStringList(CONFIG_DEFINES,defs);
    Location::terminate();

    prevCurrentDir = QDir::currentPath();
    currentDir = QFileInfo(fileName).path();
    if (!currentDir.isEmpty())
        QDir::setCurrent(currentDir);

    QString phase = " in -";
    if (Generator::singleExec())
        phase += "single exec mode, ";
    else
        phase += "separate exec mode, ";
    if (Generator::preparing())
        phase += "prepare phase ";
    else if (Generator::generating())
        phase += "generate phase ";
    QString msg = "Running qdoc for " + config.getString(CONFIG_PROJECT) + phase;
    Location::logToStdErr(msg);

    /*
      Initialize all the classes and data structures with the
      qdoc configuration. This is safe to do for each qdocconf
      file processed, because all the data structures created
      are either cleared after they have been used, or they
      are cleared in the terminate() functions below.
     */
    Location::initialize(config);
    Tokenizer::initialize(config);
    Doc::initialize(config);
    CodeMarker::initialize(config);
    CodeParser::initialize(config);
    Generator::initialize(config);

#ifndef QT_NO_TRANSLATION
    /*
      Load the language translators, if the configuration specifies any,
      but only if they haven't already been loaded. This works in both
      -prepare/-generate mode and -singleexec mode.
     */
    QStringList fileNames = config.getStringList(CONFIG_TRANSLATORS);
    QStringList::ConstIterator fn = fileNames.constBegin();
    while (fn != fileNames.constEnd()) {
        bool found = false;
        if (!translators.isEmpty()) {
            for (int i=0; i<translators.size(); ++i) {
                if (translators.at(i).first == *fn) {
                    found = true;
                    break;
                }
            }
        }
        if (!found) {
            QTranslator *translator = new QTranslator(0);
            if (!translator->load(*fn)) {
                config.lastLocation().error(QCoreApplication::translate("QDoc", "Cannot load translator '%1'").arg(*fn));
            }
            else {
                QCoreApplication::instance()->installTranslator(translator);
                translators.append(Translator(*fn, translator));
            }
        }
        ++fn;
    }
#endif

    //QSet<QString> outputLanguages = config.getStringSet(CONFIG_OUTPUTLANGUAGES);

    /*
      Get the source language (Cpp) from the configuration
      and the location in the configuration file where the
      source language was set.
     */
    QString lang = config.getString(CONFIG_LANGUAGE);
    Location langLocation = config.lastLocation();

    /*
      Initialize the qdoc database, where all the parsed source files
      will be stored. The database includes a tree of nodes, which gets
      built as the source files are parsed. The documentation output is
      generated by traversing that tree.

      Note: qdocDB() allocates a new instance only if no instance exists.
      So it is safe to call qdocDB() any time.
     */
    QDocDatabase* qdb = QDocDatabase::qdocDB();
    qdb->setVersion(config.getString(CONFIG_VERSION));
    qdb->setShowInternal(config.getBool(CONFIG_SHOWINTERNAL));
    qdb->setSingleExec(config.getBool(CONFIG_SINGLEEXEC));
    /*
      By default, the only output format is HTML.
     */
    QSet<QString> outputFormats = config.getOutputFormats();
    Location outputFormatsLocation = config.lastLocation();

    qdb->clearSearchOrder();
    if (!Generator::singleExec()) {
        Generator::debug("  loading index files");
        loadIndexFiles(config);
        Generator::debug("  done loading index files");
        qdb->newPrimaryTree(project);
    }
    else if (Generator::preparing())
        qdb->newPrimaryTree(project);
    else
        qdb->setPrimaryTree(project);

    dependModules = config.getStringList(CONFIG_DEPENDS);
    dependModules.removeDuplicates();
    qdb->setSearchOrder(dependModules);

    QSet<QString> excludedDirs;
    QSet<QString> excludedFiles;
    QStringList excludedDirsList;
    QStringList excludedFilesList;

    if (!Generator::singleExec() || !Generator::generating()) {
        QStringList headerList;
        QStringList sourceList;

        Generator::debug("Reading excludedirs");
        excludedDirsList = config.getCanonicalPathList(CONFIG_EXCLUDEDIRS);
        foreach (const QString &excludeDir, excludedDirsList) {
            QString p = QDir::fromNativeSeparators(excludeDir);
            QDir tmp(p);
            if (tmp.exists())
                excludedDirs.insert(p);
        }

        Generator::debug("Reading excludefiles");
        excludedFilesList = config.getCanonicalPathList(CONFIG_EXCLUDEFILES);
        foreach (const QString& excludeFile, excludedFilesList) {
            QString p = QDir::fromNativeSeparators(excludeFile);
            excludedFiles.insert(p);
        }

        Generator::debug("Reading headerdirs");
        headerList = config.getAllFiles(CONFIG_HEADERS,CONFIG_HEADERDIRS,excludedDirs,excludedFiles);
        QMap<QString,QString> headers;
        QMultiMap<QString,QString> headerFileNames;
        for (int i=0; i<headerList.size(); ++i) {
            if (headerList[i].contains(QString("doc/snippets")))
                continue;
            if (headers.contains(headerList[i]))
                continue;
            headers.insert(headerList[i],headerList[i]);
            QString t = headerList[i].mid(headerList[i].lastIndexOf('/')+1);
            headerFileNames.insert(t,t);
        }

        Generator::debug("Reading sourcedirs");
        sourceList = config.getAllFiles(CONFIG_SOURCES,CONFIG_SOURCEDIRS,excludedDirs,excludedFiles);
        QMap<QString,QString> sources;
        QMultiMap<QString,QString> sourceFileNames;
        for (int i=0; i<sourceList.size(); ++i) {
            if (sourceList[i].contains(QString("doc/snippets")))
                continue;
            if (sources.contains(sourceList[i]))
                continue;
            sources.insert(sourceList[i],sourceList[i]);
            QString t = sourceList[i].mid(sourceList[i].lastIndexOf('/')+1);
            sourceFileNames.insert(t,t);
        }
        /*
          Find all the qdoc files in the example dirs, and add
          them to the source files to be parsed.
        */
        Generator::debug("Reading exampledirs");
        QStringList exampleQdocList = config.getExampleQdocFiles(excludedDirs, excludedFiles);
        for (int i=0; i<exampleQdocList.size(); ++i) {
            if (!sources.contains(exampleQdocList[i])) {
                sources.insert(exampleQdocList[i],exampleQdocList[i]);
                QString t = exampleQdocList[i].mid(exampleQdocList[i].lastIndexOf('/')+1);
                sourceFileNames.insert(t,t);
            }
        }

        Generator::debug("Adding doc/image dirs found in exampledirs to imagedirs");
        QSet<QString> exampleImageDirs;
        QStringList exampleImageList = config.getExampleImageFiles(excludedDirs, excludedFiles);
        for (int i=0; i<exampleImageList.size(); ++i) {
            if (exampleImageList[i].contains("doc/images")) {
                QString t = exampleImageList[i].left(exampleImageList[i].lastIndexOf("doc/images")+10);
                if (!exampleImageDirs.contains(t)) {
                    exampleImageDirs.insert(t);
                }
            }
        }
        Generator::augmentImageDirs(exampleImageDirs);

        /*
          Parse each header file in the set using the appropriate parser and add it
          to the big tree.
        */
        QSet<CodeParser *> usedParsers;

        Generator::debug("Parsing header files");
        int parsed = 0;
        QMap<QString,QString>::ConstIterator h = headers.constBegin();
        while (h != headers.constEnd()) {
            CodeParser *codeParser = CodeParser::parserForHeaderFile(h.key());
            if (codeParser) {
                ++parsed;
                Generator::debug(QString("Parsing " + h.key()));
                codeParser->parseHeaderFile(config.location(), h.key());
                usedParsers.insert(codeParser);
            }
            ++h;
        }

        foreach (CodeParser *codeParser, usedParsers)
            codeParser->doneParsingHeaderFiles();

        usedParsers.clear();
        qdb->resolveInheritance();

        /*
          Parse each source text file in the set using the appropriate parser and
          add it to the big tree.
        */
        parsed = 0;
        Generator::debug("Parsing source files");
        QMap<QString,QString>::ConstIterator s = sources.constBegin();
        while (s != sources.constEnd()) {
            CodeParser *codeParser = CodeParser::parserForSourceFile(s.key());
            if (codeParser) {
                ++parsed;
                Generator::debug(QString("Parsing " + s.key()));
                codeParser->parseSourceFile(config.location(), s.key());
                usedParsers.insert(codeParser);
            }
            ++s;
        }
        Generator::debug(QString("Parsing done."));

        foreach (CodeParser *codeParser, usedParsers)
            codeParser->doneParsingSourceFiles();

        /*
          Now the primary tree has been built from all the header and
          source files. Resolve all the class names, function names,
          targets, URLs, links, and other stuff that needs resolving.
        */
        Generator::debug("Resolving stuff prior to generating docs");
        qdb->resolveIssues();
    }
    else {
        Generator::debug("Reading excludedirs");
        excludedDirsList = config.getCanonicalPathList(CONFIG_EXCLUDEDIRS);
        foreach (const QString &excludeDir, excludedDirsList) {
            QString p = QDir::fromNativeSeparators(excludeDir);
            QDir tmp(p);
            if (tmp.exists())
                excludedDirs.insert(p);
        }

        Generator::debug("Reading excludefiles");
        excludedFilesList = config.getCanonicalPathList(CONFIG_EXCLUDEFILES);
        foreach (const QString& excludeFile, excludedFilesList) {
            QString p = QDir::fromNativeSeparators(excludeFile);
            excludedFiles.insert(p);
        }

        Generator::debug("Adding doc/image dirs found in exampledirs to imagedirs");
        QSet<QString> exampleImageDirs;
        QStringList exampleImageList = config.getExampleImageFiles(excludedDirs, excludedFiles);
        for (int i=0; i<exampleImageList.size(); ++i) {
            if (exampleImageList[i].contains("doc/images")) {
                QString t = exampleImageList[i].left(exampleImageList[i].lastIndexOf("doc/images")+10);
                if (!exampleImageDirs.contains(t)) {
                    exampleImageDirs.insert(t);
                }
            }
        }
        Generator::augmentImageDirs(exampleImageDirs);
        qdb->resolveStuff();
    }

    /*
      The primary tree is built and all the stuff that needed
      resolving has been resolved. Now traverse the tree and
      generate the documentation output. More than one output
      format can be requested. The tree is traversed for each
      one.
     */
    Generator::debug("Generating docs");
    QSet<QString>::ConstIterator of = outputFormats.constBegin();
    while (of != outputFormats.constEnd()) {
        Generator* generator = Generator::generatorForFormat(*of);
        if (generator == 0)
            outputFormatsLocation.fatal(QCoreApplication::translate("QDoc",
                                               "Unknown output format '%1'").arg(*of));
        generator->generateDocs();
        ++of;
    }
#if 0
    if (Generator::generating() && Generator::writeQaPages())
        qdb->printLinkCounts(project);
#endif
    qdb->clearLinkCounts();

    Generator::debug("Terminating qdoc classes");
    if (Generator::debugging())
        Generator::stopDebugging(project);

    QDocDatabase::qdocDB()->setVersion(QString());
    Generator::terminate();
    CodeParser::terminate();
    CodeMarker::terminate();
    Doc::terminate();
    Tokenizer::terminate();
    Location::terminate();
    QDir::setCurrent(prevCurrentDir);

    Generator::debug("qdoc classes terminated");
}

extern Q_CORE_EXPORT QBasicAtomicInt qt_qhash_seed;
QT_END_NAMESPACE

int main(int argc, char **argv)
{
    QT_USE_NAMESPACE

#ifndef QT_BOOTSTRAPPED
    qt_qhash_seed.testAndSetRelaxed(-1, 0); // set the hash seed to 0 if it wasn't set yet
#endif
    QCoreApplication app(argc, argv);
    app.setApplicationVersion(QStringLiteral(QT_VERSION_STR));

    /*
      Create code parsers for the languages to be parsed,
      and create a tree for C++.
     */
    CppCodeParser cppParser;
    QmlCodeParser qmlParser;
    PureDocParser docParser;

    /*
      Create code markers for plain text, C++,
      javascript, and QML.
     */
    PlainCodeMarker plainMarker;
    CppCodeMarker cppMarker;
    JsCodeMarker jsMarker;
    QmlCodeMarker qmlMarker;

    HtmlGenerator htmlGenerator;

    QCommandLineParser parser;
    parser.setApplicationDescription(QCoreApplication::translate("qdoc", "Qt documentation generator"));
    parser.addHelpOption();
    parser.addVersionOption();

    parser.setSingleDashWordOptionMode(QCommandLineParser::ParseAsLongOptions);

    parser.addPositionalArgument("file1.qdocconf ...", QCoreApplication::translate("qdoc", "Input files"));

    QCommandLineOption defineOption(QStringList() << QStringLiteral("D"));
    defineOption.setDescription(QCoreApplication::translate("qdoc", "Define the argument as a macro while parsing sources"));
    defineOption.setValueName(QStringLiteral("macro[=def]"));
    parser.addOption(defineOption);

    QCommandLineOption dependsOption(QStringList() << QStringLiteral("depends"));
    dependsOption.setDescription(QCoreApplication::translate("qdoc", "Specify dependent modules"));
    dependsOption.setValueName(QStringLiteral("module"));
    parser.addOption(dependsOption);

    QCommandLineOption highlightingOption(QStringList() << QStringLiteral("highlighting"));
    highlightingOption.setDescription(QCoreApplication::translate("qdoc", "Turn on syntax highlighting (makes qdoc run slower)"));
    parser.addOption(highlightingOption);

    QCommandLineOption showInternalOption(QStringList() << QStringLiteral("showinternal"));
    showInternalOption.setDescription(QCoreApplication::translate("qdoc", "Include content marked internal"));
    parser.addOption(showInternalOption);

    QCommandLineOption redirectDocumentationToDevNullOption(QStringList() << QStringLiteral("redirect-documentation-to-dev-null"));
    redirectDocumentationToDevNullOption.setDescription(QCoreApplication::translate("qdoc", "Save all documentation content to /dev/null. Useful if someone is interested in qdoc errors only."));
    parser.addOption(redirectDocumentationToDevNullOption);

    QCommandLineOption noExamplesOption(QStringList() << QStringLiteral("no-examples"));
    noExamplesOption.setDescription(QCoreApplication::translate("qdoc", "Do not generate documentation for examples"));
    parser.addOption(noExamplesOption);

    QCommandLineOption indexDirOption(QStringList() << QStringLiteral("indexdir"));
    indexDirOption.setDescription(QCoreApplication::translate("qdoc", "Specify a directory where QDoc should search for index files to load"));
    indexDirOption.setValueName(QStringLiteral("dir"));
    parser.addOption(indexDirOption);

    QCommandLineOption installDirOption(QStringList() << QStringLiteral("installdir"));
    installDirOption.setDescription(QCoreApplication::translate("qdoc", "Specify the directory where the output will be after running \"make install\""));
    installDirOption.setValueName(QStringLiteral("dir"));
    parser.addOption(installDirOption);

    QCommandLineOption obsoleteLinksOption(QStringList() << QStringLiteral("obsoletelinks"));
    obsoleteLinksOption.setDescription(QCoreApplication::translate("qdoc", "Report links from obsolete items to non-obsolete items"));
    parser.addOption(obsoleteLinksOption);

    QCommandLineOption outputDirOption(QStringList() << QStringLiteral("outputdir"));
    outputDirOption.setDescription(QCoreApplication::translate("qdoc", "Specify output directory, overrides setting in qdocconf file"));
    outputDirOption.setValueName(QStringLiteral("dir"));
    parser.addOption(outputDirOption);

    QCommandLineOption outputFormatOption(QStringList() << QStringLiteral("outputformat"));
    outputFormatOption.setDescription(QCoreApplication::translate("qdoc", "Specify output format, overrides setting in qdocconf file"));
    outputFormatOption.setValueName(QStringLiteral("format"));
    parser.addOption(outputFormatOption);

    QCommandLineOption noLinkErrorsOption(QStringList() << QStringLiteral("no-link-errors"));
    noLinkErrorsOption.setDescription(QCoreApplication::translate("qdoc", "Do not print link errors (i.e. missing targets)"));
    parser.addOption(noLinkErrorsOption);

    QCommandLineOption autoLinkErrorsOption(QStringList() << QStringLiteral("autolink-errors"));
    autoLinkErrorsOption.setDescription(QCoreApplication::translate("qdoc", "Show errors when automatic linking fails"));
    parser.addOption(autoLinkErrorsOption);

    QCommandLineOption debugOption(QStringList() << QStringLiteral("debug"));
    debugOption.setDescription(QCoreApplication::translate("qdoc", "Enable debug output"));
    parser.addOption(debugOption);

    QCommandLineOption prepareOption(QStringList() << QStringLiteral("prepare"));
    prepareOption.setDescription(QCoreApplication::translate("qdoc", "Run qdoc only to generate an index file, not the docs"));
    parser.addOption(prepareOption);

    QCommandLineOption generateOption(QStringList() << QStringLiteral("generate"));
    generateOption.setDescription(QCoreApplication::translate("qdoc", "Run qdoc to read the index files and generate the docs"));
    parser.addOption(generateOption);

    QCommandLineOption logProgressOption(QStringList() << QStringLiteral("log-progress"));
    logProgressOption.setDescription(QCoreApplication::translate("qdoc", "Log progress on stderr."));
    parser.addOption(logProgressOption);

    QCommandLineOption singleExecOption(QStringList() << QStringLiteral("single-exec"));
    singleExecOption.setDescription(QCoreApplication::translate("qdoc", "Run qdoc once over all the qdoc conf files."));
    parser.addOption(singleExecOption);

    QCommandLineOption writeQaPagesOption(QStringList() << QStringLiteral("write-qa-pages"));
    writeQaPagesOption.setDescription(QCoreApplication::translate("qdoc", "Write QA pages."));
    parser.addOption(writeQaPagesOption);

    parser.process(app);

    defines += parser.values(defineOption);
    dependModules += parser.values(dependsOption);
    highlighting = parser.isSet(highlightingOption);
    showInternal = parser.isSet(showInternalOption);
    singleExec = parser.isSet(singleExecOption);
    writeQaPages = parser.isSet(writeQaPagesOption);
    redirectDocumentationToDevNull = parser.isSet(redirectDocumentationToDevNullOption);
    Config::generateExamples = !parser.isSet(noExamplesOption);
    foreach (const QString &indexDir, parser.values(indexDirOption)) {
        if (QFile::exists(indexDir))
            indexDirs += indexDir;
        else
            qDebug() << "Cannot find index directory" << indexDir;
    }
    if (parser.isSet(installDirOption))
        Config::installDir = parser.value(installDirOption);
    obsoleteLinks = parser.isSet(obsoleteLinksOption);
    if (parser.isSet(outputDirOption))
        Config::overrideOutputDir = parser.value(outputDirOption);
    foreach (const QString &format, parser.values(outputFormatOption))
        Config::overrideOutputFormats.insert(format);
    noLinkErrors = parser.isSet(noLinkErrorsOption);
    autolinkErrors = parser.isSet(autoLinkErrorsOption);
    if (parser.isSet(debugOption))
        Generator::startDebugging(QString("command line"));
    if (parser.isSet(prepareOption))
        Generator::setQDocPass(Generator::Prepare);
    if (parser.isSet(generateOption))
        Generator::setQDocPass(Generator::Generate);
    if (parser.isSet(singleExecOption))
        Generator::setSingleExec();
    if (parser.isSet(writeQaPagesOption))
        Generator::setWriteQaPages();
    if (parser.isSet(logProgressOption))
        Location::startLoggingProgress();

    /*
      The default indent for code is 4.
      The default value for false is 0.
      The default supported file extensions are cpp, h, qdoc and qml.
      The default language is c++.
      The default output format is html.
      The default tab size is 8.
      And those are all the default values for configuration variables.
     */
    if (defaults.isEmpty()) {
        defaults.insert(CONFIG_CODEINDENT, QLatin1String("4"));
        defaults.insert(CONFIG_FALSEHOODS, QLatin1String("0"));
        defaults.insert(CONFIG_FILEEXTENSIONS, QLatin1String("*.cpp *.h *.qdoc *.qml"));
        defaults.insert(CONFIG_LANGUAGE, QLatin1String("Cpp"));
        defaults.insert(CONFIG_OUTPUTFORMATS, QLatin1String("HTML"));
        defaults.insert(CONFIG_TABSIZE, QLatin1String("8"));
    }

    QStringList qdocFiles = parser.positionalArguments();
    if (qdocFiles.isEmpty())
        parser.showHelp();

    if (singleExec)
        qdocFiles = Config::loadMaster(qdocFiles.at(0));

    /*
      Main loop is now modified to handle single exec mode.
     */
    if (Generator::singleExec())
        Generator::setQDocPass(Generator::Prepare);
    foreach (const QString &qf, qdocFiles) {
        dependModules.clear();
        processQdocconfFile(qf);
    }
    if (Generator::singleExec()) {
        Generator::setQDocPass(Generator::Generate);
        QDocDatabase* qdb = QDocDatabase::qdocDB();
        qdb->processForest();
        foreach (const QString &qf, qdocFiles) {
            dependModules.clear();
            processQdocconfFile(qf);
        }
    }

#ifndef QT_NO_TRANSLATION
    if (!translators.isEmpty()) {
        for (int i=0; i<translators.size(); ++i) {
            delete translators.at(i).second;
        }
    }
    translators.clear();
#endif

#ifdef DEBUG_SHUTDOWN_CRASH
    qDebug() << "main(): Delete qdoc database";
#endif
    QDocDatabase::destroyQdocDB();
#ifdef DEBUG_SHUTDOWN_CRASH
    qDebug() << "main(): qdoc database deleted";
#endif

    return EXIT_SUCCESS;
}