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#include <QDir>
#include <QSettings>
#include <QLocale>
#include <QApplication>
#include <QProcess>

#include "xsession.h"

// TODO: void instead of bool? (or return something useful)
bool XSession::init(const QString& name, const QString& exec,
                    const QString& comment, const QString& icon) {
    this->name_ = name;
    this->exec_ = exec;
    this->comment_ = comment;
    this->icon_ = icon;
}

bool XSession::isActive() const {
    return true;
}

bool XSession::isLocked() const {
    return false;
}

int XSession::priority() const {
    return 0;
}

QString XSession::icon() const {
    QString icon(this->icon_);

    if(icon.isEmpty()) {
        if (this->name_.contains("kde", Qt::CaseInsensitive)) {
            icon = "kde";
        } else if (this->name_.contains("gnome", Qt::CaseInsensitive)) {
            icon = "gnome";
        } else if (this->name_.contains("xfce", Qt::CaseInsensitive)) {
            icon = "xfce";
        } else {
            icon = "linux";
        }
    }

    return icon;
}

bool XSession::run() const {
    return QProcess::startDetached(this->exec_);
}

QList<Session*> XSession::readSessions(const QString& path) {
    QList<Session*> retval;
    foreach (QFileInfo fi, QDir(path).entryInfoList(QStringList("*.desktop"))) {
        if (fi.baseName().compare("default.desktop") == 0) {
            continue;
        }

        QSettings settings(fi.absoluteFilePath(), QSettings::IniFormat);
        settings.setIniCodec("UTF-8");

        settings.beginGroup("Desktop Entry");

        if (settings.value("NoDisplay").toString().compare("true") == 0 ||
            settings.value("Hidden").toString().compare("true") == 0) {
            continue;
        }

        if (!settings.contains("Exec")) {
            // TODO: error message
            continue;
        }
        QString exec(settings.value("Exec").toString());

        QString locale(QLocale::system().name());
        QString language(locale.split("_").at(0));
        QString name;
        if (settings.contains("Name[" + locale + "]")) {
            name = settings.value("Name[" + locale + "]").toString();
        } else if (settings.contains("Name[" + language + "]")) {
            name = settings.value("Name[" + language + "]").toString();
        } else if (settings.contains("Name")) {
            name = settings.value("Name").toString();
        } else {
            // TODO: error message
            continue;
        }

        QString comment;
        if (settings.contains("Comment[" + locale + "]")) {
            comment = settings.value("Comment[" + locale + "]").toString();
        } else if (settings.contains("Comment[" + language + "]")) {
            comment = settings.value("Comment[" + language + "]").toString();
        } else {
            comment = settings.value("Comment").toString();
        }

        QString icon(settings.value("Icon").toString());
        if (QDir::isRelativePath(icon)) {
            // icons with relative paths are too complicated to find
            // see http://freedesktop.org/wiki/Specifications/icon-theme-spec
            // let's just ignore them
            icon = QString();
        }

        XSession* session = new XSession;
        session->init(name, exec, comment, icon);

        retval.append(session);
    }

    return retval;
}

bool XSession::operator<(const Session& other) const {
    int p0 = this->priority();
    int p1 = other.priority();

    if (p0 < p1) return true;
    if (p0 == p1) {
        QString d0 = this->shortDescription();
        QString d1 = other.shortDescription();
        return d0.localeAwareCompare(d1) < 0;
    }
    return false;
}