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) {

studio-manager/main.cpp

@@ -28,12 +28,23 @@ int main(int argc, char* argv[]) {
 
     dmf::StudioManager manager(bin_dir, domain);
 
-    if (argc > 1) {
-        auto r = manager.load_graph_file(argv[1]);
-        if (r.value("type", "") == "error") {
-            fprintf(stderr, "[studio-manager] %s\n",
-                r.value("message", "load failed").c_str());
-            return 1;
+    {
+        bool clean = false;
+        const char* explicit_path = nullptr;
+        for (int i = 1; i < argc; ++i) {
+            if (std::string(argv[i]) == "--clean") clean = true;
+            else explicit_path = argv[i];
+        }
+
+        fs::path load_path = explicit_path ? fs::path(explicit_path) : bin_dir / "last_graph.json";
+        if (!clean && fs::exists(load_path)) {
+            fprintf(stderr, "[studio-manager] restoring graph from %s\n", load_path.c_str());
+            auto r = manager.load_graph_file(load_path.string());
+            if (r.value("type", "") == "error") {
+                fprintf(stderr, "[studio-manager] %s\n",
+                    r.value("message", "load failed").c_str());
+                if (explicit_path) return 1;  // explicit path failure is fatal; auto-restore is not
+            }
         }
     }