Remove uneeded files on torrent deletion

Fix encoding error in file renaming

src/qtlibtorrent/qbtsession.cpp

@@ -774,7 +774,13 @@ void QBtSession::deleteTorrent(QString hash, bool delete_local_files) {
       savePathsToRemove[hash] = save_dir.absolutePath();
     s->remove_torrent(h.get_torrent_handle(), session::delete_files);
   } else {
+    QStringList uneeded_files = h.uneeded_files_path();
     s->remove_torrent(h.get_torrent_handle());
+    // Remove unneeded files
+    foreach(const QString &uneeded_file, uneeded_files) {
+      qDebug("Removing uneeded file: %s", qPrintable(uneeded_file));
+      misc::safeRemove(uneeded_file);
+    }
   }
   // Remove it from torrent backup directory
   QDir torrentBackup(misc::BTBackupLocation());

src/qtlibtorrent/qtorrenthandle.cpp

@@ -379,7 +379,7 @@ size_type QTorrentHandle::total_payload_upload() const {
 // to all files in a torrent
 QStringList QTorrentHandle::files_path() const {
   Q_ASSERT(h.is_valid());
-  QDir saveDir(misc::toQString(h.save_path().string()));
+  QDir saveDir(save_path());
   QStringList res;
   torrent_info::file_iterator fi = h.get_torrent_info().begin_files();
   while(fi != h.get_torrent_info().end_files()) {
@@ -389,6 +389,22 @@ QStringList QTorrentHandle::files_path() const {
   return res;
 }
 
+QStringList QTorrentHandle::uneeded_files_path() const {
+  Q_ASSERT(h.is_valid());
+  QDir saveDir(save_path());
+  QStringList res;
+  std::vector<int> fp = h.file_priorities();
+  torrent_info::file_iterator fi = h.get_torrent_info().begin_files();
+  int i = 0;
+  while(fi != h.get_torrent_info().end_files()) {
+    if(fp[i] == 0)
+      res << QDir::cleanPath(saveDir.absoluteFilePath(misc::toQStringU(fi->path.string())));
+    fi++;
+    ++i;
+  }
+  return res;
+}
+
 bool QTorrentHandle::has_missing_files() const {
   const QStringList paths = files_path();
   foreach(const QString &path, paths) {

src/qtlibtorrent/qtorrenthandle.h

@@ -110,6 +110,7 @@ class QTorrentHandle {
     size_type all_time_download() const;
     size_type total_done() const;
     QStringList files_path() const;
+    QStringList uneeded_files_path() const;
     bool has_missing_files() const;
     int num_uploads() const;
     bool is_seed() const;