fixed worlds list scanning

src/files/WorldFiles.cpp

@@ -28,8 +28,6 @@
 #include <sstream>
 #include <cstring>
 
-namespace fs = std::filesystem;
-
 regfile::regfile(fs::path filename) : file(filename) {
     if (file.length() < REGION_HEADER_SIZE)
         throw std::runtime_error("incomplete region file header");
@@ -90,6 +88,8 @@ uint WorldRegion::getChunkDataSize(uint x, uint z) {
 	return sizes[z * REGION_SIZE + x];
 }
 
+const char* WorldFiles::WORLD_FILE = "world.json";
+
 WorldFiles::WorldFiles(fs::path directory, const DebugSettings& settings) 
 	: directory(directory), 
 	  generatorTestMode(settings.generatorTestMode),
@@ -248,7 +248,7 @@ fs::path WorldFiles::getPlayerFile() const {
 }
 
 fs::path WorldFiles::getWorldFile() const {
-	return directory/fs::path("world.json");
+	return directory/fs::path(WORLD_FILE);
 }
 
 fs::path WorldFiles::getIndicesFile() const {

src/files/WorldFiles.h

@@ -146,6 +146,8 @@ public:
 	void write(const World* world, const Content* content);
 	void writePacks(const World* world);
 	void writeIndices(const ContentIndices* indices);
+
+    static const char* WORLD_FILE;
 };
 
 #endif /* FILES_WORLDFILES_H_ */

src/files/engine_paths.cpp

@@ -2,7 +2,9 @@
 
 #include <filesystem>
 #include <sstream>
+
 #include "../typedefs.h"
+#include "WorldFiles.h"
 
 #define SCREENSHOTS_FOLDER "screenshots"
 
@@ -41,6 +43,27 @@ fs::path EnginePaths::getWorldsFolder() {
     return userfiles/fs::path("worlds");
 }
 
+std::vector<fs::path> EnginePaths::scanForWorlds() {
+    std::vector<fs::path> folders;
+
+    fs::path folder = getWorldsFolder();
+    if (!fs::is_directory(folder))
+        return folders;
+    
+    for (auto entry : fs::directory_iterator(folder)) {
+        if (!entry.is_directory()) {
+            continue;
+        }
+        fs::path worldFolder = entry.path();
+        fs::path worldFile = worldFolder/fs::path(WorldFiles::WORLD_FILE);
+        if (!fs::is_regular_file(worldFile)) {
+            continue;
+        }
+        folders.push_back(worldFolder);
+    }
+    return folders;
+}
+
 bool EnginePaths::isWorldNameUsed(std::string name) {
     return fs::exists(EnginePaths::getWorldsFolder()/fs::u8path(name));
 }

src/files/engine_paths.h

@@ -25,6 +25,8 @@ public:
     void setResources(fs::path folder);
     void setContentPacks(std::vector<ContentPack>* contentPacks);
 
+    std::vector<fs::path> scanForWorlds();
+
     fs::path resolve(std::string path);
 };