Display module presets when available

Fixes #58

Signed-off-by: falkTX <falktx@falktx.com>

src/CardinalModuleWidget.cpp

@@ -27,6 +27,8 @@
 
 #include "CardinalCommon.hpp"
 
+#include <regex>
+
 #include <app/ModuleWidget.hpp>
 #include <app/RackWidget.hpp>
 #include <app/Scene.hpp>
@@ -126,6 +128,43 @@ void CardinalModuleWidget__saveDialog(ModuleWidget* const w)
     });
 }
 
+// Create ModulePresetPathItems for each patch in a directory.
+static void appendPresetItems(ui::Menu* menu, WeakPtr<ModuleWidget> moduleWidget, std::string presetDir) {
+    bool foundPresets = false;
+
+    // Note: This is not cached, so opening this menu each time might have a bit of latency.
+    if (system::isDirectory(presetDir))
+    {
+        std::vector<std::string> entries = system::getEntries(presetDir);
+        std::sort(entries.begin(), entries.end());
+        for (std::string path : entries) {
+            std::string name = system::getStem(path);
+            // Remove "1_", "42_", "001_", etc at the beginning of preset filenames
+            std::regex r("^\\d+_");
+            name = std::regex_replace(name, r, "");
+
+            if (system::getExtension(path) == ".vcvm")
+            {
+                if (!foundPresets)
+                    menu->addChild(new ui::MenuSeparator);
+
+                foundPresets = true;
+
+                menu->addChild(createMenuItem(name, "", [=]() {
+                    if (!moduleWidget)
+                        return;
+                    try {
+                        moduleWidget->loadAction(path);
+                    }
+                    catch (Exception& e) {
+                        async_dialog_message(e.what());
+                    }
+                }));
+            }
+        }
+    }
+};
+
 static void CardinalModuleWidget__createContextMenu(ModuleWidget* const w,
                                                     plugin::Model* const model,
                                                     engine::Module* const module) {
@@ -164,23 +203,21 @@ static void CardinalModuleWidget__createContextMenu(ModuleWidget* const w,
             CardinalModuleWidget__loadDialog(weakThis);
         }));
 
+        /* TODO requires setting up user dir
         menu->addChild(createMenuItem("Save as", "", [weakThis]() {
             if (!weakThis)
                 return;
             CardinalModuleWidget__saveDialog(weakThis);
         }));
 
-        /* TODO
         // Scan `<user dir>/presets/<plugin slug>/<module slug>` for presets.
         menu->addChild(new ui::MenuSeparator);
         menu->addChild(createMenuLabel("User presets"));
         appendPresetItems(menu, weakThis, weakThis->model->getUserPresetDirectory());
+        */
 
         // Scan `<plugin dir>/presets/<module slug>` for presets.
-        menu->addChild(new ui::MenuSeparator);
-        menu->addChild(createMenuLabel("Factory presets"));
         appendPresetItems(menu, weakThis, weakThis->model->getFactoryPresetDirectory());
-        */
     }));
 
     // Initialize