diff src/fswatcher.cpp @ 538:bdc9de794839 fswatcher

Start separate FsWatcher class to manage filesystem watch policy

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fswatcher.cpp	Fri Feb 10 17:53:04 2012 +0000
@@ -0,0 +1,145 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    EasyMercurial
+
+    Based on hgExplorer by Jari Korhonen
+    Copyright (c) 2010 Jari Korhonen
+    Copyright (c) 2011 Chris Cannam
+    Copyright (c) 2011 Queen Mary, University of London
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#include "fswatcher.h"
+
+#include <QMutexLocker>
+#include <QDir>
+
+#include <deque>
+
+FsWatcher::FsWatcher() :
+    m_lastToken(0),
+    m_lastCounter(0)
+{
+    connect(&m_watcher, SIGNAL(directoryChanged(QString)),
+	    this, SLOT(fsDirectoryChanged(QString)));
+    connect(&m_watcher, SIGNAL(fileChanged(QString)),
+	    this, SLOT(fsFileChanged(QString)));
+}
+
+FsWatcher::~FsWatcher()
+{
+}
+
+void
+FsWatcher::setWorkDirPath(QString path)
+{
+    QMutexLocker locker(&m_mutex);
+    m_watcher.removePaths(m_watcher.directories());
+    m_watcher.removePaths(m_watcher.files());
+    m_workDirPath = path;
+    addWorkDirectory(path);
+}
+
+void
+FsWatcher::addWorkDirectory(QString path)
+{
+    // QFileSystemWatcher will refuse to add a file or directory to
+    // its watch list that it is already watching -- fine -- but it
+    // prints a warning when this happens, which we wouldn't want.  So
+    // we'll check for duplicates ourselves.
+    QSet<QString> alreadyWatched = 
+	QSet<QString>::fromList(m_watcher.directories());
+    
+    std::deque<QString> pending;
+    pending.push_back(path);
+
+    while (!pending.empty()) {
+
+        QString path = pending.front();
+        pending.pop_front();
+        if (!alreadyWatched.contains(path)) {
+            m_watcher.addPath(path);
+        }
+
+        QDir d(path);
+        if (d.exists()) {
+            d.setFilter(QDir::Dirs | QDir::NoDotAndDotDot |
+                        QDir::Readable | QDir::NoSymLinks);
+            foreach (QString entry, d.entryList()) {
+                if (entry.startsWith('.')) continue;
+                QString entryPath = d.absoluteFilePath(entry);
+                pending.push_back(entryPath);
+            }
+        }
+    }
+}
+
+void
+FsWatcher::setIgnoredFilePrefixes(QStringList prefixes)
+{
+    QMutexLocker locker(&m_mutex);
+    m_ignoredPrefixes = prefixes;
+}
+
+void
+FsWatcher::setIgnoredFileSuffixes(QStringList suffixes)
+{
+    QMutexLocker locker(&m_mutex);
+    m_ignoredSuffixes = suffixes;
+}
+
+int
+FsWatcher::getNewToken()
+{
+    QMutexLocker locker(&m_mutex);
+    int token = ++m_lastToken;
+    m_tokenMap[token] = m_lastCounter;
+    return token;
+}
+
+QSet<QString>
+FsWatcher::getChangedPaths(int token)
+{
+    QMutexLocker locker(&m_mutex);
+    size_t lastUpdatedAt = m_tokenMap[token];
+    QSet<QString> changed;
+    for (QHash<QString, size_t>::const_iterator i = m_changes.begin();
+	 i != m_changes.end(); ++i) {
+	if (i.value() > lastUpdatedAt) {
+	    changed.insert(i.key());
+	}
+    }
+    m_tokenMap[token] = m_lastCounter;
+    return changed;
+}
+
+void
+FsWatcher::fsDirectoryChanged(QString path)
+{
+    {
+	QMutexLocker locker(&m_mutex);
+	if (shouldIgnore(path)) return;
+	size_t counter = ++m_lastCounter;
+	m_changes[path] = counter;
+    }
+    emit changed();
+}
+
+void
+FsWatcher::fsFileChanged(QString path)
+{
+    QMutexLocker locker(&m_mutex);
+}
+
+bool
+FsWatcher::shouldIgnore(QString path)
+{
+    
+}
+