world/content added to packs search paths

src/content/ContentPack.cpp

@@ -71,20 +71,25 @@ std::vector<std::string> ContentPack::worldPacksList(fs::path folder) {
     return files::read_list(listfile);
 }
 
-fs::path ContentPack::findPack(const EnginePaths* paths, std::string name) {
+fs::path ContentPack::findPack(const EnginePaths* paths, fs::path worldDir, std::string name) {
-    auto folder = paths->getResources() / fs::path("content") / fs::path(name);
+    fs::path folder = worldDir / fs::path("content") / fs::path(name);
-    if (!fs::is_directory(folder)) {
+    if (fs::is_directory(folder)) {
-        throw contentpack_error(name, folder, 
+        return folder;
-                                "could not to find pack '"+name+"'");
     }
-    return folder;
+    folder = paths->getResources() / fs::path("content") / fs::path(name);
+    if (fs::is_directory(folder)) {
+        return folder;
+    }
+    throw contentpack_error(name, folder, 
+                            "could not to find pack '"+name+"'");
 }
 
 void ContentPack::readPacks(const EnginePaths* paths,
                             std::vector<ContentPack>& packs, 
-                            const std::vector<std::string>& packnames) {
+                            const std::vector<std::string>& packnames,
+                            std::filesystem::path worldDir) {
     for (const auto& name : packnames) {
-        fs::path packfolder = ContentPack::findPack(paths, name);
+        fs::path packfolder = ContentPack::findPack(paths, worldDir, name);
         packs.push_back(ContentPack::read(packfolder));
     }
 }

src/content/ContentPack.h

@@ -37,10 +37,15 @@ struct ContentPack {
     static void scan(std::filesystem::path folder, 
                      std::vector<ContentPack>& packs);
     static std::vector<std::string> worldPacksList(std::filesystem::path folder);
-    static std::filesystem::path findPack(const EnginePaths* paths, std::string name);
+
+    static std::filesystem::path findPack(
+        const EnginePaths* paths, 
+        std::filesystem::path worldDir, 
+        std::string name);
     static void readPacks(const EnginePaths* paths,
                           std::vector<ContentPack>& packs, 
-                          const std::vector<std::string>& names);
+                          const std::vector<std::string>& names,
+                          std::filesystem::path worldDir);
 };
 
 #endif // CONTENT_CONTENT_PACK_H_

src/frontend/menu.cpp

@@ -153,7 +153,7 @@ void open_world(std::string name, Engine* engine) {
     packs.clear();
     try {
         auto packNames = ContentPack::worldPacksList(folder);
-        ContentPack::readPacks(paths, packs, packNames);
+        ContentPack::readPacks(paths, packs, packNames, folder);
     } catch (contentpack_error& error) {
         // could not to find or read pack
         guiutil::alert(engine->getGUI(),