Use a multiple file select dialog for mod install button

include/zelda_support.h

@@ -3,10 +3,12 @@
 
 #include <functional>
 #include <filesystem>
+#include <vector>
 
 namespace zelda64 {
     std::filesystem::path get_asset_path(const char* asset);
     void open_file_dialog(std::function<void(bool success, const std::filesystem::path& path)> callback);
+    void open_file_dialog_multiple(std::function<void(bool success, const std::list<std::filesystem::path>& paths)> callback);
     void show_error_message_box(const char *title, const char *message);
 
 // Apple specific methods that usually require Objective-C. Implemented in support_apple.mm.

src/main/support.cpp

@@ -20,6 +20,29 @@ namespace zelda64 {
         callback(success, path);
     }
 
+    void perform_file_dialog_operation_multiple(const std::function<void(bool, const std::list<std::filesystem::path>&)>& callback) {
+        const nfdpathset_t* native_paths = nullptr;
+        nfdresult_t result = NFD_OpenDialogMultipleN(&native_paths, nullptr, 0, nullptr);
+
+        bool success = (result == NFD_OKAY);
+        std::list<std::filesystem::path> paths;
+        nfdpathsetsize_t count = 0;
+
+        if (success) {
+            NFD_PathSet_GetCount(native_paths, &count);
+            for (nfdpathsetsize_t i = 0; i < count; i++) {
+                nfdnchar_t* cur_path = nullptr;
+                nfdresult_t cur_result = NFD_PathSet_GetPathN(native_paths, i, &cur_path);
+                if (cur_result == NFD_OKAY) {
+                    paths.emplace_back(std::filesystem::path{cur_path});
+                }
+            }
+            NFD_PathSet_Free(native_paths);
+        }
+
+        callback(success, paths);
+    }
+
     // MARK: - Public API
 
     std::filesystem::path get_asset_path(const char* asset) {
@@ -41,6 +64,16 @@ namespace zelda64 {
 #endif
     }
 
+    void open_file_dialog_multiple(std::function<void(bool success, const std::list<std::filesystem::path>& paths)> callback) {
+#ifdef __APPLE__
+        dispatch_on_ui_thread([callback]() {
+            perform_file_dialog_operation_multiple(callback);
+        });
+#else
+        perform_file_dialog_operation_multiple(callback);
+#endif
+    }
+
     void show_error_message_box(const char *title, const char *message) {
 #ifdef __APPLE__
     std::string title_copy(title);

src/ui/ui_mod_menu.cpp

@@ -243,11 +243,11 @@ void ModMenu::open_mods_folder() {
 }
 
 void ModMenu::open_install_dialog() {
-    zelda64::open_file_dialog([](bool success, const std::filesystem::path& path) {
+    zelda64::open_file_dialog_multiple([](bool success, const std::list<std::filesystem::path>& paths) {
         if (success) {
             ContextId old_context = recompui::try_close_current_context();
 
-            recompui::drop_files({ path });
+            recompui::drop_files(paths);
 
             if (old_context != ContextId::null()) {
                 old_context.open();