Remove subdirectory watches after a directory is removed from the library. Otherwise subdirectories that changed after the directory was removed would be re-scanned and re-added.

src/core/filesystemwatcherinterface.h

@@ -26,6 +26,7 @@ class FileSystemWatcherInterface : public QObject {
   FileSystemWatcherInterface(QObject* parent = 0);
   virtual void Init() {}
   virtual void AddPath(const QString& path) = 0;
+  virtual void RemovePath(const QString& path) = 0;
   virtual void Clear() = 0;
 
   static FileSystemWatcherInterface* Create(QObject* parent = 0);

src/core/macfslistener.h

@@ -32,6 +32,7 @@ class MacFSListener : public FileSystemWatcherInterface {
   explicit MacFSListener(QObject* parent = 0);
   void Init();
   void AddPath(const QString& path);
+  void RemovePath(const QString& path);
   void Clear();
 
  signals:

src/core/macfslistener.mm

@@ -59,6 +59,12 @@ void MacFSListener::AddPath(const QString& path) {
   UpdateStream();
 }
 
+void MacFSListener::RemovePath(const QString& path) {
+  Q_ASSERT(run_loop_);
+  paths_.remove(path);
+  UpdateStream();
+}
+
 void MacFSListener::Clear() {
   paths_.clear();
   UpdateStream();

src/core/qtfslistener.cpp

@@ -30,6 +30,10 @@ void QtFSListener::AddPath(const QString& path) {
   watcher_.addPath(path);
 }
 
+void QtFSListener::RemovePath(const QString& path) {
+  watcher_.removePath(path);
+}
+
 void QtFSListener::Clear() {
   watcher_.removePaths(watcher_.directories());
   watcher_.removePaths(watcher_.files());

src/core/qtfslistener.h

@@ -27,6 +27,7 @@ class QtFSListener : public FileSystemWatcherInterface {
  public:
   QtFSListener(QObject* parent);
   virtual void AddPath(const QString& path);
+  virtual void RemovePath(const QString& path);
   virtual void Clear();
 
  private:

src/library/directory.h

@@ -27,13 +27,17 @@ class QSqlQuery;
 struct Directory {
   Directory() : id(-1) {}
 
+  bool operator ==(const Directory& other) const {
+    return path == other.path && id == other.id;
+  }
+
   QString path;
   int id;
 };
-Q_DECLARE_METATYPE(Directory);
+Q_DECLARE_METATYPE(Directory)
 
 typedef QList<Directory> DirectoryList;
-Q_DECLARE_METATYPE(DirectoryList);
+Q_DECLARE_METATYPE(DirectoryList)
 
 
 struct Subdirectory {
@@ -43,9 +47,9 @@ struct Subdirectory {
   QString path;
   uint mtime;
 };
-Q_DECLARE_METATYPE(Subdirectory);
+Q_DECLARE_METATYPE(Subdirectory)
 
 typedef QList<Subdirectory> SubdirectoryList;
-Q_DECLARE_METATYPE(SubdirectoryList);
+Q_DECLARE_METATYPE(SubdirectoryList)
 
 #endif // DIRECTORY_H

src/library/librarywatcher.cpp

@@ -184,9 +184,7 @@ SubdirectoryList LibraryWatcher::ScanTransaction::GetAllSubdirs() {
 }
 
 void LibraryWatcher::AddDirectory(const Directory& dir, const SubdirectoryList& subdirs) {
-  DirData data;
-  data.dir = dir;
-  watched_dirs_[dir.id] = data;
+  watched_dirs_[dir.id] = dir;
 
   if (subdirs.isEmpty()) {
     // This is a new directory that we've never seen before.
@@ -208,7 +206,7 @@ void LibraryWatcher::AddDirectory(const Directory& dir, const SubdirectoryList&
         ScanSubdirectory(subdir.path, subdir, &transaction);
 
       if (monitor_)
-        AddWatch(data, subdir.path);
+        AddWatch(dir, subdir.path);
     }
   }
 
@@ -223,8 +221,8 @@ void LibraryWatcher::ScanSubdirectory(
   // Do not scan symlinked dirs that are already in collection
   if (path_info.isSymLink()) {
     QString real_path = path_info.symLinkTarget();
-    foreach (const DirData& dir_data, watched_dirs_) {
-      if (real_path.startsWith(dir_data.dir.path)) {
+    foreach (const Directory& dir, watched_dirs_) {
+      if (real_path.startsWith(dir.path)) {
         t->AddToProgress(1);
         return;
       }
@@ -550,7 +548,7 @@ uint LibraryWatcher::GetMtimeForCue(const QString& cue_path) {
              : 0;
 }
 
-void LibraryWatcher::AddWatch(const DirData& dir, const QString& path) {
+void LibraryWatcher::AddWatch(const Directory& dir, const QString& path) {
   if (!QFile::exists(path))
     return;
 
@@ -563,6 +561,12 @@ void LibraryWatcher::AddWatch(const DirData& dir, const QString& path) {
 void LibraryWatcher::RemoveDirectory(const Directory& dir) {
   rescan_queue_.remove(dir.id);
   watched_dirs_.remove(dir.id);
+
+  // Stop watching the directory's subdirectories
+  foreach (const QString& subdir_path, subdir_mapping_.keys(dir)) {
+    fs_watcher_->RemovePath(subdir_path);
+    subdir_mapping_.remove(subdir_path);
+  }
 }
 
 bool LibraryWatcher::FindSongByPath(const SongList& list, const QString& path, Song* out) {
@@ -578,11 +582,11 @@ bool LibraryWatcher::FindSongByPath(const SongList& list, const QString& path, S
 
 void LibraryWatcher::DirectoryChanged(const QString &subdir) {
   // Find what dir it was in
-  QHash<QString, DirData>::const_iterator it = subdir_mapping_.constFind(subdir);
+  QHash<QString, Directory>::const_iterator it = subdir_mapping_.constFind(subdir);
   if (it == subdir_mapping_.constEnd()) {
     return;
   }
-  Directory dir = it->dir;
+  Directory dir = *it;
 
   qLog(Debug) << "Subdir" << subdir << "changed under directory" << dir.path << "id" << dir.id;
 
@@ -702,10 +706,10 @@ void LibraryWatcher::ReloadSettings() {
     fs_watcher_->Clear();
   } else if (monitor_ && !was_monitoring_before) {
     // Add all directories to all QFileSystemWatchers again
-    foreach (const DirData& data, watched_dirs_.values()) {
-      SubdirectoryList subdirs = backend_->SubdirsInDirectory(data.dir.id);
+    foreach (const Directory& dir, watched_dirs_.values()) {
+      SubdirectoryList subdirs = backend_->SubdirsInDirectory(dir.id);
       foreach (const Subdirectory& subdir, subdirs) {
-        AddWatch(data, subdir.path);
+        AddWatch(dir, subdir.path);
       }
     }
   }
@@ -739,8 +743,8 @@ void LibraryWatcher::FullScanNow() {
 }
 
 void LibraryWatcher::PerformScan(bool incremental, bool ignore_mtimes) {
-  foreach (const DirData& data, watched_dirs_.values()) {
-    ScanTransaction transaction(this, data.dir.id,
+  foreach (const Directory& dir, watched_dirs_.values()) {
+    ScanTransaction transaction(this, dir.id,
                                 incremental, ignore_mtimes);
     SubdirectoryList subdirs(transaction.GetAllSubdirs());
     transaction.AddToProgressMax(subdirs.count());

src/library/librarywatcher.h

@@ -140,18 +140,13 @@ class LibraryWatcher : public QObject {
                         ScanTransaction* t, bool force_noincremental = false);
 
  private:
-  // One of these gets stored for each Directory we're watching
-  struct DirData {
-    Directory dir;
-  };
-
   static bool FindSongByPath(const SongList& list, const QString& path, Song* out);
   inline static QString NoExtensionPart( const QString &fileName );
   inline static QString ExtensionPart( const QString &fileName );
   inline static QString DirectoryPart( const QString &fileName );
   QString PickBestImage(const QStringList& images);
   QString ImageForSong(const QString& path, QMap<QString, QStringList>& album_art);
-  void AddWatch(const DirData& dir, const QString& path);
+  void AddWatch(const Directory& dir, const QString& path);
   uint GetMtimeForCue(const QString& cue_path);
   void PerformScan(bool incremental, bool ignore_mtimes);
 
@@ -181,7 +176,7 @@ class LibraryWatcher : public QObject {
   QString device_name_;
 
   FileSystemWatcherInterface* fs_watcher_;
-  QHash<QString, DirData> subdir_mapping_;
+  QHash<QString, Directory> subdir_mapping_;
 
   /* A list of words use to try to identify the (likely) best image 
    * found in an directory to use as cover artwork.
@@ -194,7 +189,7 @@ class LibraryWatcher : public QObject {
   bool scan_on_startup_;
   bool monitor_;
 
-  QMap<int, DirData> watched_dirs_;
+  QMap<int, Directory> watched_dirs_;
   QTimer* rescan_timer_;
   QMap<int, QStringList> rescan_queue_; // dir id -> list of subdirs to be scanned
   bool rescan_paused_;