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/*
SPDX-FileCopyrightText: 2020 Friedrich W. H. Kossebau <kossebau@kde.org>
SPDX-License-Identifier: LGPL-2.0-or-later
*/
#include "sessionfilestracker.h"
// library
#include <kdevelopsessionsobserver.h>
// KF
#include <KDirWatch>
#include <KConfig>
#include <KConfigGroup>
// Qt
#include <QFileInfo>
#include <QDir>
#include <QStandardPaths>
#include <QUuid>
#include <QMutexLocker>
#include <QMetaObject>
#include <QCoreApplication>
// Std
#include <algorithm>
namespace {
namespace Strings {
QString sessionConfigFileName() { return QStringLiteral("sessionrc"); }
}
}
Q_GLOBAL_STATIC(SessionFilesTracker, s_SessionFilesTrackerInstance)
SessionFilesTracker *SessionFilesTracker::instance()
{
return s_SessionFilesTrackerInstance();
}
static void setSessionDataList(QObject* observer, const QVector<KDevelopSessionData>& sessionDataList)
{
QMetaObject::invokeMethod(observer, "setSessionDataList", Qt::AutoConnection,
Q_ARG(QVector<KDevelopSessionData>, sessionDataList));
}
static void cleanupSessionFilesTracker()
{
if (s_SessionFilesTrackerInstance.exists()) {
s_SessionFilesTrackerInstance->cleanup();
}
}
SessionFilesTracker::SessionFilesTracker()
: QObject()
, m_dirWatch(new KDirWatch(this))
{
// KDirWatch might have QFileSystemWatcher,
// which wants to be deleted before qApp is gone - bug 261541
qAddPostRoutine(cleanupSessionFilesTracker);
m_sessionDir = QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation) + QLatin1String("/kdevelop/sessions");
m_dirWatch->stopScan();
m_dirWatch->addDir(m_sessionDir, KDirWatch::WatchSubDirs);
connect(m_dirWatch, &KDirWatch::dirty, this, &SessionFilesTracker::sessionSourceChanged);
updateSessions();
}
SessionFilesTracker::~SessionFilesTracker() = default;
void SessionFilesTracker::cleanup()
{
delete m_dirWatch;
m_dirWatch = nullptr;
}
void SessionFilesTracker::registerObserver(QObject* observer)
{
if (!qobject_cast<KDevelopSessionsObserver*>(observer)) {
return;
}
QMutexLocker lock(&m_mutex);
const bool isFirstObserver = m_observers.isEmpty();
m_observers.append(observer);
setSessionDataList(observer, m_sessionDataList);
if (isFirstObserver) {
m_dirWatch->startScan(true);
}
}
void SessionFilesTracker::unregisterObserver(QObject* observer)
{
if (!qobject_cast<KDevelopSessionsObserver*>(observer)) {
return;
}
QMutexLocker lock(&m_mutex);
m_observers.removeOne(observer);
if (m_observers.isEmpty()) {
m_dirWatch->stopScan();
}
}
QVector<KDevelopSessionData> SessionFilesTracker::readSessionDataList() const
{
QVector<KDevelopSessionData> sessions;
QDir sessionBaseDir(m_sessionDir);
const auto dirEntries = sessionBaseDir.entryList(QDir::Dirs);
sessions.reserve(dirEntries.size());
for (const QString& sessionDirName : dirEntries) {
if (QUuid(sessionDirName).isNull()) {
continue;
}
QDir sessionDir(sessionBaseDir.absoluteFilePath(sessionDirName));
const QString sessionConfigFilePath = sessionDir.filePath(Strings::sessionConfigFileName());
if (!QFile::exists(sessionConfigFilePath)) {
continue;
}
KConfig sessionDataStorage(sessionConfigFilePath, KConfig::SimpleConfig);
const KConfigGroup mainSessionData = sessionDataStorage.group(QString());
const KDevelopSessionData sessionData {
sessionDirName,
mainSessionData.readEntry("SessionName"),
mainSessionData.readEntry("SessionPrettyContents"),
};
sessions.append(sessionData);
}
sessions.squeeze();
std::sort(sessions.begin(), sessions.end(), [](const KDevelopSessionData& a, const KDevelopSessionData& b) {
return a.id < b.id;
});
return sessions;
}
void SessionFilesTracker::sessionSourceChanged(const QString& path)
{
// session data is not changed too often, so we are fine to simply rescan all the data
// in case any relevant files (or the main dir) have been touched
// session dirs removed or added?
if (m_sessionDir == path) {
updateSessions();
} else {
// session config file?
QFileInfo pathInfo(path);
if (pathInfo.fileName() == Strings::sessionConfigFileName()) {
updateSessions();
}
}
}
void SessionFilesTracker::updateSessions()
{
QMutexLocker lock(&m_mutex);
const auto newSessionDataList = readSessionDataList();
if (m_sessionDataList == newSessionDataList) {
return;
}
m_sessionDataList = newSessionDataList;
for (auto* observer : std::as_const(m_observers)) {
setSessionDataList(observer, m_sessionDataList);
}
}
#include "moc_sessionfilestracker.cpp"
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