paths.cpp

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#include "paths.h"
#include <stdexcept>
#include <filesystem>
#include <QFile>
#include <QTemporaryFile>
#if defined (Q_OS_WIN32) || defined (Q_OS_MAC)
#include <QApplication>
#endif
#include <QtDebug>
#include <QDir>
#include <QUrl>
#include <QStandardPaths>
 
namespace LC::Util
{
    QStringList GetPathCandidates (SysPath path, QString suffix)
    {
        if (!suffix.isEmpty () && suffix.at (suffix.size () - 1) != '/')
            suffix += '/';
 
        switch (path)
        {
        case SysPath::QML:
            return GetPathCandidates (SysPath::Share, "qml" QT_STRINGIFY (QT_VERSION_MAJOR) "/" + suffix);
        case SysPath::Share:
#ifdef Q_OS_WIN32
            return { QApplication::applicationDirPath () + "/share/" + suffix };
#elif defined (Q_OS_MAC) && !defined (USE_UNIX_LAYOUT)
            return { QApplication::applicationDirPath () + "/../Resources/share/" + suffix };
#else
    #ifdef INSTALL_PREFIX
            return { INSTALL_PREFIX "/share/leechcraft/" + suffix };
    #endif
            return
            {
                "/usr/local/share/leechcraft/" + suffix,
                "/usr/share/leechcraft/" + suffix
            };
#endif
        }
 
        qWarning () << Q_FUNC_INFO
                << "unknown system path"
                << static_cast<int> (path);
        return {};
    }
 
    QString GetSysPath (SysPath path, const QString& suffix, const QString& filename)
    {
        for (const QString& cand : GetPathCandidates (path, suffix))
            if (QFile::exists (cand + filename))
                return cand + filename;
 
        qWarning () << Q_FUNC_INFO
                << "unable to find"
                << suffix
                << filename;
        return QString ();
    }
 
    QUrl GetSysPathUrl (SysPath path, const QString& subfolder, const QString& filename)
    {
        return QUrl::fromLocalFile (GetSysPath (path, subfolder, filename));
    }
 
    QStringList GetSystemPaths ()
    {
        return QString (qgetenv ("PATH")).split (':', Qt::SkipEmptyParts);
    }
 
    QString FindInSystemPath (const QString& name, const QStringList& paths,
            const std::function<bool (QFileInfo)>& filter)
    {
        for (const auto& dir : paths)
        {
            const QFileInfo fi (dir + '/' + name);
            if (!fi.exists ())
                continue;
 
            if (filter && !filter (fi))
                continue;
 
            return fi.absoluteFilePath ();
        }
 
        return {};
    }
 
    QDir GetUserDir (UserDir dir, const QString& subpath)
    {
        QString path;
        switch (dir)
        {
        case UserDir::Cache:
            path = QStandardPaths::writableLocation (QStandardPaths::CacheLocation);
            break;
        case UserDir::LC:
            path = QDir::home ().path () + "/.leechcraft/";
            break;
        }
 
        if (path.isEmpty ())
            throw std::runtime_error ("cannot get root path");
 
        if (!path.endsWith ('/'))
            path += '/';
        if (dir == UserDir::Cache)
            path += QLatin1String ("leechcraft5/");
        path += subpath;
 
        if (!QDir {}.exists (path) &&
                !QDir {}.mkpath (path))
            throw std::runtime_error ("cannot create path " + path.toStdString ());
 
        return { path };
    }
 
    QDir CreateIfNotExists (QString path)
    {
        auto home = QDir::home ();
        path.prepend (".leechcraft/");
 
        if (!home.exists (path) &&
                !home.mkpath (path))
            throw std::runtime_error (qPrintable (QObject::tr ("Could not create %1")
                        .arg (QDir::toNativeSeparators (home.filePath (path)))));
 
        if (!home.cd (path))
            throw std::runtime_error (qPrintable (QObject::tr ("Could not cd into %1")
                    .arg (QDir::toNativeSeparators (home.filePath (path)))));
 
        return home;
    }
 
    QString GetTemporaryName (const QString& pattern)
    {
        static const auto defaultPattern = QStringLiteral ("lc_temp.XXXXXX");
        QTemporaryFile file (QDir::tempPath () + '/' + (pattern.isEmpty () ? defaultPattern : pattern));
        if (!file.open ())
            qWarning () << "unable to open temporary file" << file.errorString ();
        const auto name = file.fileName ();
        file.close ();
        file.remove ();
        return name;
    }
 
    SpaceInfo GetSpaceInfo (const QString& path)
    {
        const auto& info = std::filesystem::space (path.toStdString ());
        return
        {
            .Capacity_ = info.capacity,
            .Free_ = info.free,
            .Available_ = info.available
        };
    }
}