combiner.md

studio-manager/StudioManager.hpp

@@ -38,7 +38,9 @@ struct NodeProcess {
 class StudioManager {
 public:
     StudioManager(fs::path bin_dir, std::string domain)
-        : bin_dir_(std::move(bin_dir)), domain_(std::move(domain)) {}
+        : bin_dir_(std::move(bin_dir))
+        , domain_(std::move(domain))
+        , save_path_(bin_dir_ / "last_graph.json") {}
 
     ~StudioManager() { shutdown(); }
 
@@ -53,6 +55,7 @@ public:
             garbage_collect_locked();
             try {
                 graph_ = parse_graph(graph_json);
+                save_graph_locked(graph_json);
                 start_all_locked();
             } catch (const std::exception& e) {
                 err = e.what();
@@ -140,6 +143,7 @@ public:
 private:
     fs::path    bin_dir_;
     std::string domain_;
+    fs::path    save_path_;
     FlowGraph   graph_;
     std::vector<NodeProcess>            processes_;
     std::mutex                          mutex_;
@@ -235,6 +239,13 @@ private:
         if (changed) notify(s);
     }
 
+    void save_graph_locked(const nlohmann::json& j) {
+        std::ofstream f(save_path_);
+        if (f) f << j.dump(2);
+        else fprintf(stderr, "[studio-manager] warning: could not save graph to %s\n",
+                     save_path_.c_str());
+    }
+
     // ── static helpers ───────────────────────────────────────────────────────
 
     static FlowGraph parse_graph(const nlohmann::json& j) {