Merge pull request #480 from Gelmir/create_torrent_tiers

Support tracker tiers / groups in torrent creator

src/torrentcreator/createtorrent.ui

@@ -123,6 +123,9 @@
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
+       <property name="toolTip">
+        <string comment="A tracker tier is a group of trackers, consisting of a main tracker and its mirrors.">You can separate tracker tiers / groups with an empty line.</string>
+       </property>
        <property name="acceptRichText">
         <bool>false</bool>
        </property>

src/torrentcreator/torrentcreatorthread.cpp

@@ -113,8 +113,18 @@ void TorrentCreatorThread::run() {
     foreach (const QString &seed, url_seeds) {
       t.add_url_seed(seed.trimmed().toStdString());
     }
+    int tier = 0;
+    bool newline = false;
     foreach (const QString &tracker, trackers) {
-      t.add_tracker(tracker.trimmed().toStdString());
+      if (tracker.isEmpty()) {
+        if (newline)
+          continue;
+        ++tier;
+        newline = true;
+        continue;
+      }
+      t.add_tracker(tracker.trimmed().toStdString(), tier);
+      newline = false;
     }
     if (abort) return;
     // calculate the hash for all pieces