Properly support saving map connections

editor.cpp

     for (ConnectionPixmapItem* item : connection_edit_items) {
         delete item;
     }
+    current_connection_edit_item = NULL;
     connection_edit_items.clear();
 
     for (Connection *connection : map->connections) {

mainwindow.cpp

     project->readItemNames();
     project->readFlagNames();
     project->readVarNames();
+    project->readMapsWithConnections();
 }
 
 void MainWindow::populateMapList() {

project.cpp

     text += QString("\t.4byte %1\n").arg(map->attributes_label);
     text += QString("\t.4byte %1\n").arg(map->events_label);
     text += QString("\t.4byte %1\n").arg(map->scripts_label);
+
+    if (map->connections.length() == 0) {
+        map->connections_label = "0x0";
+    } else {
+        map->connections_label = QString("%1_MapConnections").arg(map->name);
+    }
     text += QString("\t.4byte %1\n").arg(map->connections_label);
+
     text += QString("\t.2byte %1\n").arg(map->song);
     text += QString("\t.2byte %1\n").arg(map->index);
     text += QString("\t.byte %1\n").arg(map->location);
 }
 
 void Project::saveMapConnections(Map *map) {
-    QString connections_path = root + "/data/maps/" + map->name + "/connections.inc";
-    QString connectionsListLabel = QString("%1_MapConnectionsList").arg(map->name);
-    int numValidConnections = 0;
-    QString text = "";
-    text += QString("%1::\n").arg(connectionsListLabel);
-    for (Connection* connection : map->connections) {
-        if (mapNamesToMapConstants->contains(connection->map_name)) {
-            text += QString("\tconnection %1, %2, %3\n")
-                    .arg(connection->direction)
-                    .arg(connection->offset)
-                    .arg(mapNamesToMapConstants->value(connection->map_name));
-            numValidConnections++;
-        } else {
-            qDebug() << QString("Failed to write map connection. %1 not a valid map name").arg(connection->map_name);
+    QString path = root + "/data/maps/" + map->name + "/connections.inc";
+    if (map->connections.length() > 0) {
+        QString text = "";
+        QString connectionsListLabel = QString("%1_MapConnectionsList").arg(map->name);
+        int numValidConnections = 0;
+        text += QString("%1::\n").arg(connectionsListLabel);
+        for (Connection* connection : map->connections) {
+            if (mapNamesToMapConstants->contains(connection->map_name)) {
+                text += QString("\tconnection %1, %2, %3\n")
+                        .arg(connection->direction)
+                        .arg(connection->offset)
+                        .arg(mapNamesToMapConstants->value(connection->map_name));
+                numValidConnections++;
+            } else {
+                qDebug() << QString("Failed to write map connection. %1 not a valid map name").arg(connection->map_name);
+            }
+        }
+        text += QString("\n");
+        text += QString("%1::\n").arg(map->connections_label);
+        text += QString("\t.4byte %1\n").arg(numValidConnections);
+        text += QString("\t.4byte %1\n").arg(connectionsListLabel);
+        saveTextFile(path, text);
+    } else {
+        deleteFile(path);
+    }
+
+    updateMapsWithConnections(map);
+}
+
+void Project::updateMapsWithConnections(Map *map) {
+    if (map->connections.length() > 0) {
+        if (!mapsWithConnections.contains(map->name)) {
+            mapsWithConnections.append(map->name);
+        }
+    } else {
+        if (mapsWithConnections.contains(map->name)) {
+            mapsWithConnections.removeOne(map->name);
         }
     }
-    text += QString("\n");
-    text += QString("%1::\n").arg(map->connections_label);
-    text += QString("\t.4byte %1\n").arg(numValidConnections);
-    text += QString("\t.4byte %1\n").arg(connectionsListLabel);
-    saveTextFile(connections_path, text);
 }
 
 void Project::readMapAttributesTable() {
     saveAllMapAttributes();
     saveMapGroupsTable();
     saveMapConstantsHeader();
+    saveMapsWithConnections();
 }
 
 void Project::loadTilesetAssets(Tileset* tileset) {
     }
 }
 
+void Project::deleteFile(QString path) {
+    QFile file(path);
+    if (file.exists() && !file.remove()) {
+        qDebug() << QString("Could not delete file '%1': ").arg(path) + file.errorString();
+    }
+}
+
 void Project::readMapGroups() {
     QString text = readTextFile(root + "/data/maps/_groups.inc");
     if (text.isNull()) {
     }
 }
 
+void Project::readMapsWithConnections() {
+    QString path = root + "/data/maps/connections.inc";
+    QString text = readTextFile(path);
+    if (text.isNull()) {
+        return;
+    }
+
+    mapsWithConnections.clear();
+    QRegularExpression re("data\\/maps\\/(?<mapName>\\w+)\\/connections.inc");
+    QList<QStringList>* includes = parseAsm(text);
+    for (QStringList values : *includes) {
+        if (values.length() != 2)
+            continue;
+
+        QRegularExpressionMatch match = re.match(values.value(1));
+        if (match.hasMatch()) {
+            QString mapName = match.captured("mapName");
+            mapsWithConnections.append(mapName);
+        }
+    }
+}
+
+void Project::saveMapsWithConnections() {
+    QString path = root + "/data/maps/connections.inc";
+    QString text = "";
+    for (QString mapName : mapsWithConnections) {
+        if (mapNamesToMapConstants->contains(mapName)) {
+            text += QString("\t.include \"data/maps/%1/connections.inc\"\n").arg(mapName);
+        } else {
+            qDebug() << QString("Failed to write connection include. %1 not a valid map name").arg(mapName);
+        }
+    }
+    saveTextFile(path, text);
+}
+
 QStringList Project::getSongNames() {
     QStringList names;
     QString text = readTextFile(root + "/include/constants/songs.h");

project.h

     QStringList *itemNames = NULL;
     QStringList *flagNames = NULL;
     QStringList *varNames = NULL;
+    QStringList mapsWithConnections;
 
     QMap<QString, Map*> *map_cache;
     Map* loadMap(QString);
     QString readTextFile(QString path);
     void saveTextFile(QString path, QString text);
     void appendTextFile(QString path, QString text);
+    void deleteFile(QString path);
 
     void readMapGroups();
     Map* addNewMapToGroup(QString mapName, int groupNum);
     void readMapAttributesTable();
     void readAllMapAttributes();
     void readMapAttributes(Map*);
+    void readMapsWithConnections();
     void getTilesets(Map*);
     void loadTilesetAssets(Tileset*);
 
     QString getMapAssetsFilepath();
     void saveMapHeader(Map*);
     void saveMapConnections(Map*);
+    void updateMapsWithConnections(Map*);
+    void saveMapsWithConnections();
     void saveMapAttributesTable();
     void updateMapAttributes(Map* map);
     void readCDefinesSorted(QString, QStringList, QStringList*);