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