reimplemented infrastructure for autorecovery projects

Foundation for a fairly simple but likely essential autorecovery process.
Basically the same as what it was in 0.1.x but with a huge improvement: custom
autorecovery intervals. Ironically there isn't any "saving" to be done
just yet, but when there is, this infrastructure will be ready for it.

app/config/config.cpp

@@ -53,6 +53,7 @@ void Config::SetDefaults()
   config_map_["DefaultStillLength"] = QVariant::fromValue(rational(2));
   config_map_["HoverFocus"] = false;
   config_map_["AudioScrubbing"] = true;
+  config_map_["AutorecoveryInterval"] = 1;
 }
 
 void Config::Load()

app/core.cpp

@@ -52,7 +52,8 @@ Core olive::core;
 Core::Core() :
   main_window_(nullptr),
   tool_(olive::tool::kPointer),
-  snapping_(true)
+  snapping_(true),
+  queue_autorecovery_(false)
 {
 }
 
@@ -351,6 +352,19 @@ void Core::StartGUI(bool full_screen)
 
   // Initialize audio service
   AudioManager::CreateInstance();
+
+  // Start autorecovery timer using the config value as its interval
+  SetAutorecoveryInterval(Config::Current()["AutorecoveryInterval"].toInt());
+  autorecovery_timer_.start();
+}
+
+void Core::SaveAutorecovery()
+{
+  if (queue_autorecovery_) {
+    // FIXME: Save autorecovery of projects open
+
+    queue_autorecovery_ = false;
+  }
 }
 
 Project *Core::GetActiveProject()
@@ -366,3 +380,15 @@ Project *Core::GetActiveProject()
   // Otherwise, return the project panel's project (which may be nullptr but in most cases shouldn't be)
   return active_project_panel->project();
 }
+
+void Core::SetProjectModified()
+{
+  main_window()->setWindowModified(true);
+  queue_autorecovery_ = true;
+}
+
+void Core::SetAutorecoveryInterval(int minutes)
+{
+  // Convert minutes to milliseconds
+  autorecovery_timer_.setInterval(minutes * 60000);
+}

app/core.h

@@ -22,6 +22,7 @@
 #define CORE_H
 
 #include <QList>
+#include <QTimer>
 
 #include "project/project.h"
 #include "project/projectviewmodel.h"
@@ -113,6 +114,19 @@ public:
    */
   Project* GetActiveProject();
 
+  /**
+   * @brief Sets state to "modified" so that the GUI will prompt the user to save before closing
+   *
+   * Call this function whenever a change is made to a currently active project. Saving the project will automatically
+   * unset this.
+   */
+  void SetProjectModified();
+
+  /**
+   * @brief Set how frequently an autorecovery should be saved (if the project has changed, see SetProjectModified())
+   */
+  void SetAutorecoveryInterval(int minutes);
+
 public slots:
   /**
    * @brief Set the current application-wide tool
@@ -226,6 +240,22 @@ private:
    */
   bool snapping_;
 
+  /**
+   * @brief Internal value for whether to make an autorecovery next interval
+   *
+   * True if the project has changed since the last autorecovery and we should save next time. False if the project has
+   * not changed and saving another autorecovery would be a waste.
+   */
+  bool queue_autorecovery_;
+
+  /**
+   * @brief Internal timer for saving autorecovery files
+   */
+  QTimer autorecovery_timer_;
+
+private slots:
+  void SaveAutorecovery();
+
 };
 
 namespace olive {