World content packs list

src/content/ContentPack.cpp

@@ -1,9 +1,11 @@
 #include "ContentPack.h"
 
+#include <iostream>
 #include <stdexcept>
 
-#include "../files/files.h"
 #include "../coders/json.h"
+#include "../files/files.h"
+#include "../files/engine_paths.h"
 
 namespace fs = std::filesystem;
 
@@ -44,3 +46,21 @@ void ContentPack::scan(fs::path rootfolder,
         packs.push_back(read(folder));
     }
 }
+
+std::vector<std::string> ContentPack::worldPacksList(fs::path folder) {
+    fs::path listfile = folder / fs::path("packs.list");
+    if (!fs::is_regular_file(listfile)) {
+        std::cerr << "warning: packs.list not found (will be created)";
+        std::cerr << std::endl;
+        files::write_string(listfile, "# autogenerated, do not modify\nbase\n");
+    }
+    return files::read_list(listfile);
+}
+
+fs::path ContentPack::findPack(const EnginePaths* paths, std::string name) {
+    auto folder = paths->getResources() / fs::path("content") / fs::path(name);
+    if (!fs::is_directory(folder)) {
+        throw std::runtime_error("could not to find pack '"+name+"'");
+    }
+    return folder;
+}

src/content/ContentPack.h

@@ -5,6 +5,8 @@
 #include <vector>
 #include <filesystem>
 
+class EnginePaths;
+
 struct ContentPack {
     std::string id = "none";
     std::string title = "untitled";
@@ -19,6 +21,8 @@ struct ContentPack {
     static ContentPack read(std::filesystem::path folder);
     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);
 };
 
 #endif // CONTENT_CONTENT_PACK_H_