src/views/versioncontrol/versioncontrolobserver.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "versioncontrolobserver.h"
  21
  22 #include "dolphin_versioncontrolsettings.h"
  23
  24 #include <KLocale>
  25 #include <KService>
  26 #include <KDebug>
  27 #include <KServiceTypeTrader>
  28 #include <kitemviews/kfileitemmodel.h>
  29 #include <kversioncontrolplugin2.h>
  30
  31 #include "updateitemstatesthread.h"
  32
  33 #include <QFile>
  34 #include <QMutexLocker>
  35 #include <QTimer>
  36
  37 VersionControlObserver::VersionControlObserver(QObject* parent) :
  38     QObject(parent),
  39     m_pendingItemStatesUpdate(false),
  40     m_versionedDirectory(false),
  41     m_silentUpdate(false),
  42     m_model(0),
  43     m_dirVerificationTimer(0),
  44     m_plugin(0),
  45     m_updateItemStatesThread(0)
  46 {
  47     // The verification timer specifies the timeout until the shown directory
  48     // is checked whether it is versioned. Per default it is assumed that users
  49     // don't iterate through versioned directories and a high timeout is used
  50     // The timeout will be decreased as soon as a versioned directory has been
  51     // found (see verifyDirectory()).
  52     m_dirVerificationTimer = new QTimer(this);
  53     m_dirVerificationTimer->setSingleShot(true);
  54     m_dirVerificationTimer->setInterval(500);
  55     connect(m_dirVerificationTimer, &QTimer::timeout,
  56             this, &VersionControlObserver::verifyDirectory);
  57 }
  58
  59 VersionControlObserver::~VersionControlObserver()
  60 {
  61     if (m_plugin) {
  62         m_plugin->disconnect(this);
  63         m_plugin = 0;
  64     }
  65 }
  66
  67 void VersionControlObserver::setModel(KFileItemModel* model)
  68 {
  69     if (m_model) {
  70         disconnect(m_model, &KFileItemModel::itemsInserted,
  71                    this, &VersionControlObserver::delayedDirectoryVerification);
  72         disconnect(m_model, &KFileItemModel::itemsChanged,
  73                    this, &VersionControlObserver::delayedDirectoryVerification);
  74     }
  75
  76     m_model = model;
  77
  78     if (model) {
  79         connect(m_model, &KFileItemModel::itemsInserted,
  80                 this, &VersionControlObserver::delayedDirectoryVerification);
  81         connect(m_model, &KFileItemModel::itemsChanged,
  82                 this, &VersionControlObserver::delayedDirectoryVerification);
  83     }
  84 }
  85
  86 KFileItemModel* VersionControlObserver::model() const
  87 {
  88     return m_model;
  89 }
  90
  91 QList<QAction*> VersionControlObserver::actions(const KFileItemList& items) const
  92 {
  93     QList<QAction*> actions;
  94
  95     bool hasNullItems = false;
  96     foreach (const KFileItem& item, items) {
  97         if (item.isNull()) {
  98             kWarning() << "Requesting version-control-actions for empty items";
  99             hasNullItems = true;
 100             break;
 101         }
 102     }
 103
 104     if (!m_model || hasNullItems) {
 105         return actions;
 106     }
 107
 108     KVersionControlPlugin2* pluginV2 = qobject_cast<KVersionControlPlugin2*>(m_plugin);
 109     if (pluginV2) {
 110         // Use version 2 of the KVersionControlPlugin which allows providing actions
 111         // also for non-versioned directories.
 112         actions = pluginV2->actions(items);
 113     } else if (isVersioned()) {
 114         // Support deprecated interfaces from KVersionControlPlugin version 1.
 115         // Context menu actions where only available for versioned directories.
 116         QString directory;
 117         if (items.count() == 1) {
 118             const KFileItem rootItem = m_model->rootItem();
 119             if (!rootItem.isNull() && items.first().url() == rootItem.url()) {
 120                 directory = rootItem.url().path();
 121             }
 122         }
 123
 124         actions = directory.isEmpty() ? m_plugin->contextMenuActions(items)
 125                                       : m_plugin->contextMenuActions(directory);
 126     }
 127
 128     return actions;
 129 }
 130
 131 void VersionControlObserver::delayedDirectoryVerification()
 132 {
 133     m_silentUpdate = false;
 134     m_dirVerificationTimer->start();
 135 }
 136
 137 void VersionControlObserver::silentDirectoryVerification()
 138 {
 139     m_silentUpdate = true;
 140     m_dirVerificationTimer->start();
 141 }
 142
 143 void VersionControlObserver::verifyDirectory()
 144 {
 145     if (!m_model) {
 146         return;
 147     }
 148
 149     const KFileItem rootItem = m_model->rootItem();
 150     if (rootItem.isNull() || !rootItem.url().isLocalFile()) {
 151         return;
 152     }
 153
 154     if (m_plugin) {
 155         m_plugin->disconnect(this);
 156     }
 157
 158     m_plugin = searchPlugin(rootItem.url());
 159     if (m_plugin) {
 160         KVersionControlPlugin2* pluginV2 = qobject_cast<KVersionControlPlugin2*>(m_plugin);
 161         if (pluginV2) {
 162             connect(pluginV2, &KVersionControlPlugin2::itemVersionsChanged,
 163                     this, &VersionControlObserver::silentDirectoryVerification);
 164         } else {
 165             connect(m_plugin, &KVersionControlPlugin::versionStatesChanged,
 166                     this, &VersionControlObserver::silentDirectoryVerification);
 167         }
 168         connect(m_plugin, &KVersionControlPlugin::infoMessage,
 169                 this, &VersionControlObserver::infoMessage);
 170         connect(m_plugin, &KVersionControlPlugin::errorMessage,
 171                 this, &VersionControlObserver::errorMessage);
 172         connect(m_plugin, &KVersionControlPlugin::operationCompletedMessage,
 173                 this, &VersionControlObserver::operationCompletedMessage);
 174
 175         if (!m_versionedDirectory) {
 176             m_versionedDirectory = true;
 177
 178             // The directory is versioned. Assume that the user will further browse through
 179             // versioned directories and decrease the verification timer.
 180             m_dirVerificationTimer->setInterval(100);
 181         }
 182         updateItemStates();
 183     } else if (m_versionedDirectory) {
 184         m_versionedDirectory = false;
 185
 186         // The directory is not versioned. Reset the verification timer to a higher
 187         // value, so that browsing through non-versioned directories is not slown down
 188         // by an immediate verification.
 189         m_dirVerificationTimer->setInterval(500);
 190     }
 191 }
 192
 193 void VersionControlObserver::slotThreadFinished()
 194 {
 195     UpdateItemStatesThread* thread = m_updateItemStatesThread;
 196     m_updateItemStatesThread = 0; // The thread deletes itself automatically (see updateItemStates())
 197
 198     if (!m_plugin || !thread) {
 199         return;
 200     }
 201
 202     const QMap<QString, QVector<ItemState> >& itemStates = thread->itemStates();
 203     QMap<QString, QVector<ItemState> >::const_iterator it = itemStates.constBegin();
 204     for (; it != itemStates.constEnd(); ++it) {
 205         const QVector<ItemState>& items = it.value();
 206
 207         foreach (const ItemState& item, items) {
 208             QHash<QByteArray, QVariant> values;
 209             values.insert("version", QVariant(item.version));
 210             m_model->setData(m_model->index(item.item), values);
 211         }
 212     }
 213
 214     if (!m_silentUpdate) {
 215         // Using an empty message results in clearing the previously shown information message and showing
 216         // the default status bar information. This is useful as the user already gets feedback that the
 217         // operation has been completed because of the icon emblems.
 218         emit operationCompletedMessage(QString());
 219     }
 220
 221     if (m_pendingItemStatesUpdate) {
 222         m_pendingItemStatesUpdate = false;
 223         updateItemStates();
 224     }
 225 }
 226
 227 void VersionControlObserver::updateItemStates()
 228 {
 229     Q_ASSERT(m_plugin);
 230     if (m_updateItemStatesThread) {
 231         // An update is currently ongoing. Wait until the thread has finished
 232         // the update (see slotThreadFinished()).
 233         m_pendingItemStatesUpdate = true;
 234         return;
 235     }
 236
 237     QMap<QString, QVector<ItemState> > itemStates;
 238     createItemStatesList(itemStates);
 239
 240     if (!itemStates.isEmpty()) {
 241         if (!m_silentUpdate) {
 242             emit infoMessage(i18nc("@info:status", "Updating version information..."));
 243         }
 244         m_updateItemStatesThread = new UpdateItemStatesThread(m_plugin, itemStates);
 245         connect(m_updateItemStatesThread, &UpdateItemStatesThread::finished,
 246                 this, &VersionControlObserver::slotThreadFinished);
 247         connect(m_updateItemStatesThread, &UpdateItemStatesThread::finished,
 248                 m_updateItemStatesThread, &UpdateItemStatesThread::deleteLater);
 249
 250         m_updateItemStatesThread->start(); // slotThreadFinished() is called when finished
 251     }
 252 }
 253
 254 int VersionControlObserver::createItemStatesList(QMap<QString, QVector<ItemState> >& itemStates,
 255                                                  const int firstIndex)
 256 {
 257     const int itemCount = m_model->count();
 258     const int currentExpansionLevel = m_model->expandedParentsCount(firstIndex);
 259
 260     QVector<ItemState> items;
 261     items.reserve(itemCount - firstIndex);
 262
 263     int index;
 264     for (index = firstIndex; index < itemCount; ++index) {
 265         const int expansionLevel = m_model->expandedParentsCount(index);
 266
 267         if (expansionLevel == currentExpansionLevel) {
 268             ItemState itemState;
 269             itemState.item = m_model->fileItem(index);
 270             itemState.version = KVersionControlPlugin2::UnversionedVersion;
 271
 272             items.append(itemState);
 273         } else if (expansionLevel > currentExpansionLevel) {
 274             // Sub folder
 275             index += createItemStatesList(itemStates, index) - 1;
 276         } else {
 277             break;
 278         }
 279     }
 280
 281     if (items.count() > 0) {
 282         const KUrl& url = items.first().item.url();
 283         itemStates.insert(url.directory(KUrl::AppendTrailingSlash), items);
 284     }
 285
 286     return index - firstIndex; // number of processed items
 287 }
 288
 289 KVersionControlPlugin* VersionControlObserver::searchPlugin(const KUrl& directory) const
 290 {
 291     static bool pluginsAvailable = true;
 292     static QList<KVersionControlPlugin*> plugins;
 293
 294     if (!pluginsAvailable) {
 295         // A searching for plugins has already been done, but no
 296         // plugins are installed
 297         return 0;
 298     }
 299
 300     if (plugins.isEmpty()) {
 301         // No searching for plugins has been done yet. Query the KServiceTypeTrader for
 302         // all fileview version control plugins and remember them in 'plugins'.
 303         const QStringList enabledPlugins = VersionControlSettings::enabledPlugins();
 304
 305         const KService::List pluginServices = KServiceTypeTrader::self()->query("FileViewVersionControlPlugin");
 306         for (KService::List::ConstIterator it = pluginServices.constBegin(); it != pluginServices.constEnd(); ++it) {
 307             if (enabledPlugins.contains((*it)->name())) {
 308                 KVersionControlPlugin* plugin = (*it)->createInstance<KVersionControlPlugin>();
 309                 if (plugin) {
 310                     plugins.append(plugin);
 311                 }
 312             }
 313         }
 314         if (plugins.isEmpty()) {
 315             pluginsAvailable = false;
 316             return 0;
 317         }
 318     }
 319
 320     // We use the number of upUrl() calls to find the best matching plugin
 321     // for the given directory. The smaller value, the better it is (0 is best).
 322     KVersionControlPlugin* bestPlugin = 0;
 323     int bestScore = INT_MAX;
 324
 325     // Verify whether the current directory contains revision information
 326     // like .svn, .git, ...
 327     foreach (KVersionControlPlugin* plugin, plugins) {
 328         const QString fileName = directory.path(KUrl::AddTrailingSlash) + plugin->fileName();
 329         if (QFile::exists(fileName)) {
 330             // The score of this plugin is 0 (best), so we can just return this plugin,
 331             // instead of going through the plugin scoring procedure, we can't find a better one ;)
 332             return plugin;
 333         }
 334
 335         // Version control systems like Git provide the version information
 336         // file only in the root directory. Check whether the version information file can
 337         // be found in one of the parent directories. For performance reasons this
 338         // step is only done, if the previous directory was marked as versioned by
 339         // m_versionedDirectory. Drawback: Until e. g. Git is recognized, the root directory
 340         // must be shown at least once.
 341         if (m_versionedDirectory) {
 342             KUrl dirUrl(directory);
 343             KUrl upUrl = dirUrl.upUrl();
 344             int upUrlCounter = 1;
 345             while ((upUrlCounter < bestScore) && (upUrl != dirUrl)) {
 346                 const QString fileName = dirUrl.path(KUrl::AddTrailingSlash) + plugin->fileName();
 347                 if (QFile::exists(fileName)) {
 348                     if (upUrlCounter < bestScore) {
 349                         bestPlugin = plugin;
 350                         bestScore = upUrlCounter;
 351                     }
 352                     break;
 353                 }
 354                 dirUrl = upUrl;
 355                 upUrl = dirUrl.upUrl();
 356                 ++upUrlCounter;
 357             }
 358         }
 359     }
 360
 361     return bestPlugin;
 362 }
 363
 364 bool VersionControlObserver::isVersioned() const
 365 {
 366     return m_versionedDirectory && m_plugin;
 367 }
 368
 369 #include "versioncontrolobserver.moc"