project: implemented autorecovery core

Not done yet, but nearly.

app/config/config.cpp

@@ -66,7 +66,9 @@ void Config::SetDefaults()
   SetEntryInternal(QStringLiteral("DefaultStillLength"), NodeValue::kRational, QVariant::fromValue(rational(2)));
   SetEntryInternal(QStringLiteral("HoverFocus"), NodeValue::kBoolean, false);
   SetEntryInternal(QStringLiteral("AudioScrubbing"), NodeValue::kBoolean, true);
+  SetEntryInternal(QStringLiteral("AutorecoveryEnabled"), NodeValue::kBoolean, true);
   SetEntryInternal(QStringLiteral("AutorecoveryInterval"), NodeValue::kInt, 1);
+  SetEntryInternal(QStringLiteral("AutorecoveryMaximum"), NodeValue::kInt, 20);
   SetEntryInternal(QStringLiteral("DiskCacheSaveInterval"), NodeValue::kInt, 10000);
   SetEntryInternal(QStringLiteral("Language"), NodeValue::kText, QString());
   SetEntryInternal(QStringLiteral("ScrollZooms"), NodeValue::kBoolean, false);

app/core.cpp

@@ -39,6 +39,7 @@
 #include "common/xmlutils.h"
 #include "config/config.h"
 #include "dialog/about/about.h"
+#include "dialog/autorecovery/autorecoverydialog.h"
 #include "dialog/export/export.h"
 #include "dialog/footagerelink/footagerelinkdialog.h"
 #include "dialog/sequence/sequence.h"
@@ -164,6 +165,9 @@ void Core::Start()
 
 void Core::Stop()
 {
+  // Assume all projects have closed gracefully and no auto-recovery is necessary
+  QFile::remove(GetAutoRecoveryIndexFilename());
+
   // Save Config
   Config::Save();
 
@@ -667,6 +671,7 @@ void Core::StartGUI(bool full_screen)
 
   // Start autorecovery timer using the config value as its interval
   SetAutorecoveryInterval(Config::Current()["AutorecoveryInterval"].toInt());
+  connect(&autorecovery_timer_, &QTimer::timeout, this, &Core::SaveAutorecovery);
   autorecovery_timer_.start();
 
   // Load recently opened projects list
@@ -687,7 +692,7 @@ void Core::StartGUI(bool full_screen)
   }
 }
 
-void Core::SaveProjectInternal(Project* project)
+void Core::SaveProjectInternal(Project* project, const QString& override_filename)
 {
   // Create save manager
   Task* psm;
@@ -704,11 +709,19 @@ void Core::SaveProjectInternal(Project* project)
 #endif
   } else {
     psm = new ProjectSaveTask(project);
+
+    if (!override_filename.isEmpty()) {
+      // Set override filename if provided
+      static_cast<ProjectSaveTask*>(psm)->SetOverrideFilename(override_filename);
+    }
   }
 
   TaskDialog* task_dialog = new TaskDialog(psm, tr("Save Project"), main_window_);
 
-  connect(task_dialog, &TaskDialog::TaskSucceeded, this, &Core::ProjectSaveSucceeded);
+  if (override_filename.isEmpty()) {
+    // Default behavior: set as not modified and push to top of "Open Recent" dialog
+    connect(task_dialog, &TaskDialog::TaskSucceeded, this, &Core::ProjectSaveSucceeded);
+  }
 
   task_dialog->open();
 }
@@ -743,12 +756,85 @@ Sequence *Core::GetSequenceToExport()
   return nullptr;
 }
 
+QString Core::GetAutoRecoveryIndexFilename()
+{
+  return QDir(QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation)).filePath(QStringLiteral("unrecovered"));
+}
+
+QString Core::GetAutoRecoveryRoot()
+{
+  return QDir(QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation)).filePath(QStringLiteral("autorecovery"));
+}
+
 void Core::SaveAutorecovery()
 {
-  foreach (Project* p, open_projects_) {
-    if (!p->has_autorecovery_been_saved()) {
-      // FIXME: SAVE AN AUTORECOVERY PROJECT
-      p->set_autorecovery_saved(true);
+  if (Config::Current()[QStringLiteral("AutorecoveryEnabled")].toBool()) {
+    QStringList autorecoveries_saved;
+
+    foreach (Project* p, open_projects_) {
+      if (!p->has_autorecovery_been_saved()) {
+        QDir project_autorecovery_dir(QDir(GetAutoRecoveryRoot()).filePath(p->GetUuid().toString()));
+        if (project_autorecovery_dir.mkpath(QStringLiteral("."))) {
+          QString this_autorecovery_path = project_autorecovery_dir.filePath(QStringLiteral("%1.ove").arg(QString::number(QDateTime::currentSecsSinceEpoch())));
+
+          SaveProjectInternal(p, this_autorecovery_path);
+
+          p->set_autorecovery_saved(true);
+
+          autorecoveries_saved.append(project_autorecovery_dir.absolutePath());
+
+          qDebug() << "Saved auto-recovery to:" << this_autorecovery_path;
+
+          // Write human-readable real name so it's not just a UUID
+          {
+            QFile realname_file(project_autorecovery_dir.filePath(QStringLiteral("realname.txt")));
+            realname_file.open(QFile::WriteOnly);
+            realname_file.write(p->pretty_filename().toUtf8());
+            realname_file.close();
+          }
+
+          int64_t max_recoveries_per_file = Config::Current()[QStringLiteral("AutorecoveryMaximum")].toLongLong();
+
+          // Since we write an extra file, increment total allowed files by 1
+          max_recoveries_per_file++;
+
+          // Delete old entries
+          QStringList recovery_files = project_autorecovery_dir.entryList(QDir::Files | QDir::NoDotAndDotDot, QDir::Name);
+          while (recovery_files.size() > max_recoveries_per_file) {
+            bool deleted = false;
+            for (int i=0; i<recovery_files.size(); i++) {
+              const QString& f = recovery_files.at(i);
+
+              if (f.endsWith(QStringLiteral(".ove"), Qt::CaseInsensitive)) {
+                QString delete_full_path = project_autorecovery_dir.filePath(f);
+                qDebug() << "Deleted old recovery:" << delete_full_path;
+                QFile::remove(delete_full_path);
+                recovery_files.removeAt(i);
+                deleted = true;
+                break;
+              }
+            }
+
+            if (!deleted) {
+              // For some reason none of the files were deletable. Break so we don't end up in
+              // an infinite loop.
+              break;
+            }
+          }
+        } else {
+          QMessageBox::critical(main_window_, tr("Auto-Recovery Error"),
+                                tr("Failed to save auto-recovery to \"%1\". "
+                                   "Olive may not have permission to this directory.")
+                                .arg(project_autorecovery_dir.absolutePath()));
+        }
+      }
+    }
+
+    // Save index
+    QFile autorecovery_index(GetAutoRecoveryIndexFilename());
+    if (autorecovery_index.open(QFile::WriteOnly)) {
+      autorecovery_index.write(autorecoveries_saved.join('\n').toUtf8());
+      autorecovery_index.close();
     }
   }
 }
@@ -943,6 +1029,52 @@ void Core::ShowStatusBarMessage(const QString &s)
   main_window_->statusBar()->showMessage(s);
 }
 
+void Core::OpenRecoveryProject(const QString &filename)
+{
+  OpenProjectInternal(filename);
+}
+
+void Core::CheckForAutoRecoveries()
+{
+  QFile autorecovery_index(GetAutoRecoveryIndexFilename());
+  if (autorecovery_index.exists()) {
+    // Uh-oh, we have auto-recoveries to prompt
+    if (autorecovery_index.open(QFile::ReadOnly)) {
+      QStringList recovery_filenames = QString::fromUtf8(autorecovery_index.readAll()).split('\n');
+
+      AutoRecoveryDialog ard(tr("The following projects had unsaved changes when Olive "
+                                "forcefully quit. Would you like to load them?"),
+                             recovery_filenames, true, main_window_);
+      ard.exec();
+
+      autorecovery_index.close();
+
+      // Delete recovery index since we don't need it anymore
+      QFile::remove(GetAutoRecoveryIndexFilename());
+    } else {
+      QMessageBox::critical(main_window_, tr("Auto-Recovery Error"),
+                            tr("Found auto-recoveries but failed to load the auto-recovery index. "
+                               "Auto-recover projects will have to be opened manually.\n\n"
+                               "Your recoverable projects are still available at: %1").arg(GetAutoRecoveryRoot()));
+    }
+  }
+}
+
+void Core::BrowseAutoRecoveries()
+{
+  QDir autorecovery_root(GetAutoRecoveryRoot());
+
+  // List all auto-recovery entries
+  QStringList entries = autorecovery_root.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
+  for (int i=0; i<entries.size(); i++) {
+    entries[i] = autorecovery_root.filePath(entries.at(i));
+  }
+
+  AutoRecoveryDialog ard(tr("The following project versions have been auto-saved:"),
+                         entries, false, main_window_);
+  ard.exec();
+}
+
 bool Core::SaveProjectAs(Project* p)
 {
   QFileDialog fd(main_window_, tr("Save Project As"));

app/core.h

@@ -298,6 +298,8 @@ public:
    */
   void ShowStatusBarMessage(const QString& s);
 
+  void OpenRecoveryProject(const QString& filename);
+
   static const uint kProjectVersion;
 
 public slots:
@@ -405,6 +407,10 @@ public slots:
    */
   void CreateNewProject();
 
+  void CheckForAutoRecoveries();
+
+  void BrowseAutoRecoveries();
+
 signals:
   /**
    * @brief Signal emitted when a project is opened
@@ -485,13 +491,17 @@ private:
   /**
    * @brief Internal function for saving a project to a file
    */
-  void SaveProjectInternal(Project *project);
+  void SaveProjectInternal(Project *project, const QString &override_filename = QString());
 
   /**
    * @brief Retrieves the currently most active sequence for exporting
    */
   Sequence* GetSequenceToExport();
 
+  static QString GetAutoRecoveryIndexFilename();
+
+  static QString GetAutoRecoveryRoot();
+
   /**
    * @brief Internal main window object
    */

app/dialog/CMakeLists.txt

@@ -16,6 +16,7 @@
 
 add_subdirectory(about)
 add_subdirectory(actionsearch)
+add_subdirectory(autorecovery)
 add_subdirectory(color)
 add_subdirectory(configbase)
 add_subdirectory(diskcache)

app/dialog/autorecovery/CMakeLists.txt

@@ -0,0 +1,22 @@
+# Olive - Non-Linear Video Editor
+# Copyright (C) 2020 Olive Team
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set(OLIVE_SOURCES
+  ${OLIVE_SOURCES}
+  dialog/autorecovery/autorecoverydialog.h
+  dialog/autorecovery/autorecoverydialog.cpp
+  PARENT_SCOPE
+)

app/dialog/autorecovery/autorecoverydialog.cpp

@@ -0,0 +1,134 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2020 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "autorecoverydialog.h"
+
+#include <QDateTime>
+#include <QDialogButtonBox>
+#include <QDir>
+#include <QLabel>
+#include <QPushButton>
+#include <QVBoxLayout>
+
+#include "core.h"
+
+namespace olive {
+
+#define super QDialog
+
+AutoRecoveryDialog::AutoRecoveryDialog(const QString &message, const QStringList &recoveries, bool autocheck_latest, QWidget* parent) :
+  QDialog(parent)
+{
+  Init(message);
+
+  PopulateTree(recoveries, autocheck_latest);
+}
+
+void AutoRecoveryDialog::accept()
+{
+  foreach (QTreeWidgetItem* checkable, checkable_items_) {
+    if (checkable->checkState(0) == Qt::Checked) {
+      QString filename = checkable->data(0, kFilenameRole).toString();
+      Core::instance()->OpenRecoveryProject(filename);
+    }
+  }
+
+  super::accept();
+}
+
+void AutoRecoveryDialog::Init(const QString& header_text)
+{
+  QVBoxLayout* layout = new QVBoxLayout(this);
+
+  setWindowTitle(tr("Auto-Recovery"));
+
+  layout->addWidget(new QLabel(header_text));
+
+  tree_widget_ = new QTreeWidget();
+  tree_widget_->setHeaderHidden(true);
+  layout->addWidget(tree_widget_);
+
+  QDialogButtonBox* buttons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
+  buttons->button(QDialogButtonBox::Ok)->setText(tr("Load"));
+  connect(buttons, &QDialogButtonBox::accepted, this, &AutoRecoveryDialog::accept);
+  connect(buttons, &QDialogButtonBox::rejected, this, &AutoRecoveryDialog::reject);
+  layout->addWidget(buttons);
+}
+
+void AutoRecoveryDialog::PopulateTree(const QStringList& recoveries, bool autocheck_latest)
+{
+  // Each entry in `recoveries` is a directory with 1+ recovery projects in it
+  foreach (const QString& recovery_folder, recoveries) {
+    QDir recovery_dir(recovery_folder);
+
+    QString pretty_name;
+    {
+      // Retrieve pretty name
+      QFile pretty_name_file(recovery_dir.filePath(QStringLiteral("realname.txt")));
+      if (pretty_name_file.open(QFile::ReadOnly)) {
+        // Read pretty name that we should have written in the autorecovery process
+        pretty_name = QString::fromUtf8(pretty_name_file.readAll());
+        pretty_name_file.close();
+      }
+
+      if (pretty_name.isEmpty()) {
+        // Fallback to just the UUID. While it won't mean much to the user, it's better than nothing.
+        pretty_name = recovery_dir.dirName();
+      }
+    }
+
+    QTreeWidgetItem* top_level = new QTreeWidgetItem(tree_widget_);
+    top_level->setText(0, pretty_name);
+
+    {
+      // Populate with recoveries
+      QStringList entries = recovery_dir.entryList(QDir::Files | QDir::NoDotAndDotDot, QDir::Name | QDir::Reversed);
+      for (int i=0; i<entries.size(); i++) {
+        const QString& entry = entries.at(i);
+
+        if (entry.endsWith(QStringLiteral(".ove"), Qt::CaseInsensitive)) {
+          QTreeWidgetItem* entry_item = new QTreeWidgetItem(top_level);
+
+          bool ok;
+          qint64 recovery_time = entry.left(entry.indexOf('.')).toLongLong(&ok);
+          QString entry_name;
+
+          if (ok) {
+            // Set as time/date of recovery
+            entry_name = QDateTime::fromSecsSinceEpoch(recovery_time).toString();
+          } else {
+            // Fallback if we couldn't discern a date from this
+            entry_name = entry;
+          }
+
+          entry_item->setText(0, entry_name);
+          entry_item->setData(0, kFilenameRole, recovery_dir.filePath(entry));
+
+          // Allow to be checked, auto-checking the first entry
+          entry_item->setCheckState(0, (autocheck_latest && top_level->childCount() == 1) ? Qt::Checked : Qt::Unchecked);
+
+          checkable_items_.append(entry_item);
+        }
+      }
+    }
+  }
+}
+
+}

app/dialog/autorecovery/autorecoverydialog.h

@@ -0,0 +1,57 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2020 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef AUTORECOVERYDIALOG_H
+#define AUTORECOVERYDIALOG_H
+
+#include <QDialog>
+#include <QTreeWidget>
+
+#include "common/define.h"
+
+namespace olive {
+
+class AutoRecoveryDialog : public QDialog
+{
+  Q_OBJECT
+public:
+  AutoRecoveryDialog(const QString& message, const QStringList& recoveries, bool autocheck_latest, QWidget* parent);
+
+public slots:
+  virtual void accept() override;
+
+private:
+  void Init(const QString &header_text);
+
+  void PopulateTree(const QStringList &recoveries, bool autocheck);
+
+  QTreeWidget* tree_widget_;
+
+  QVector<QTreeWidgetItem*> checkable_items_;
+
+  enum DataRole {
+    kFilenameRole = Qt::UserRole
+  };
+
+};
+
+}
+
+#endif // AUTORECOVERYDIALOG_H

app/dialog/preferences/tabs/preferencesgeneraltab.cpp

@@ -21,6 +21,7 @@
 #include "preferencesgeneraltab.h"
 
 #include <QGridLayout>
+#include <QGroupBox>
 #include <QLabel>
 #include <QPushButton>
 
@@ -36,66 +37,116 @@ PreferencesGeneralTab::PreferencesGeneralTab()
   QVBoxLayout* layout = new QVBoxLayout(this);
   layout->setMargin(0);
 
-  QGridLayout* general_layout = new QGridLayout();
-  layout->addLayout(general_layout);
+  {
+    QGroupBox* global_groupbox = new QGroupBox(tr("Locale"));
+    QGridLayout* global_layout = new QGridLayout(global_groupbox);
+    layout->addWidget(global_groupbox);
 
-  int row = 0;
+    int row = 0;
 
-  // General -> Language
-  general_layout->addWidget(new QLabel(tr("Language:")), row, 0);
+    // General -> Language
+    global_layout->addWidget(new QLabel(tr("Language:")), row, 0);
 
-  language_combobox_ = new QComboBox();
+    language_combobox_ = new QComboBox();
 
-  // Add default language (en-US)
-  QDir language_dir(QStringLiteral(":/ts"));
-  QStringList languages = language_dir.entryList();
-  foreach (const QString& l, languages) {
-    AddLanguage(l);
-  }
-
-  QString current_language = Config::Current()[QStringLiteral("Language")].toString();
-  if (current_language.isEmpty()) {
-    // No configured language, use system language
-    current_language = QLocale::system().name();
-
-    // If we don't have a language for this, default to en_US
-    if (!languages.contains(current_language)) {
-      current_language = QStringLiteral("en_US");
+    // Add default language (en-US)
+    QDir language_dir(QStringLiteral(":/ts"));
+    QStringList languages = language_dir.entryList();
+    foreach (const QString& l, languages) {
+      AddLanguage(l);
     }
+
+    QString current_language = Config::Current()[QStringLiteral("Language")].toString();
+    if (current_language.isEmpty()) {
+      // No configured language, use system language
+      current_language = QLocale::system().name();
+
+      // If we don't have a language for this, default to en_US
+      if (!languages.contains(current_language)) {
+        current_language = QStringLiteral("en_US");
+      }
+    }
+    language_combobox_->setCurrentIndex(languages.indexOf(current_language));
+
+    global_layout->addWidget(language_combobox_, row, 1);
   }
-  language_combobox_->setCurrentIndex(languages.indexOf(current_language));
 
-  general_layout->addWidget(language_combobox_, row, 1);
+  {
+    QGroupBox* timeline_groupbox = new QGroupBox(tr("Timeline"));
+    QGridLayout* timeline_layout = new QGridLayout(timeline_groupbox);
+    layout->addWidget(timeline_groupbox);
 
-  row++;
+    int row = 0;
 
-  general_layout->addWidget(new QLabel(tr("Auto-Scroll Method:")), row, 0);
+    timeline_layout->addWidget(new QLabel(tr("Auto-Scroll Method:")), row, 0);
 
-  // ComboBox indices match enum indices
-  autoscroll_method_ = new QComboBox();
-  autoscroll_method_->addItem(tr("None"), AutoScroll::kNone);
-  autoscroll_method_->addItem(tr("Page Scrolling"), AutoScroll::kPage);
-  autoscroll_method_->addItem(tr("Smooth Scrolling"), AutoScroll::kSmooth);
-  autoscroll_method_->setCurrentIndex(Config::Current()["Autoscroll"].toInt());
-  general_layout->addWidget(autoscroll_method_, row, 1);
+    // ComboBox indices match enum indices
+    autoscroll_method_ = new QComboBox();
+    autoscroll_method_->addItem(tr("None"), AutoScroll::kNone);
+    autoscroll_method_->addItem(tr("Page Scrolling"), AutoScroll::kPage);
+    autoscroll_method_->addItem(tr("Smooth Scrolling"), AutoScroll::kSmooth);
+    autoscroll_method_->setCurrentIndex(Config::Current()["Autoscroll"].toInt());
+    timeline_layout->addWidget(autoscroll_method_, row, 1);
 
-  row++;
+    row++;
 
-  general_layout->addWidget(new QLabel(tr("Rectified Waveforms:")), row, 0);
+    timeline_layout->addWidget(new QLabel(tr("Rectified Waveforms:")), row, 0);
 
-  rectified_waveforms_ = new QCheckBox();
-  rectified_waveforms_->setChecked(Config::Current()["RectifiedWaveforms"].toBool());
-  general_layout->addWidget(rectified_waveforms_, row, 1);
+    rectified_waveforms_ = new QCheckBox();
+    rectified_waveforms_->setChecked(Config::Current()["RectifiedWaveforms"].toBool());
+    timeline_layout->addWidget(rectified_waveforms_, row, 1);
 
-  row++;
+    row++;
 
-  general_layout->addWidget(new QLabel(tr("Default Still Image Length:")), row, 0);
+    timeline_layout->addWidget(new QLabel(tr("Default Still Image Length:")), row, 0);
 
-  default_still_length_ = new FloatSlider();
-  default_still_length_->SetMinimum(0.1);
-  default_still_length_->SetFormat(tr("%1 second(s)"));
-  default_still_length_->SetValue(Config::Current()["DefaultStillLength"].value<rational>().toDouble());
-  general_layout->addWidget(default_still_length_);
+    default_still_length_ = new FloatSlider();
+    default_still_length_->SetMinimum(0.1);
+    default_still_length_->SetFormat(tr("%1 second(s)"));
+    default_still_length_->SetValue(Config::Current()["DefaultStillLength"].value<rational>().toDouble());
+    timeline_layout->addWidget(default_still_length_);
+  }
+
+  {
+    QGroupBox* autorecovery_groupbox = new QGroupBox(tr("Auto-Recovery"));
+    QGridLayout* autorecovery_layout = new QGridLayout(autorecovery_groupbox);
+    layout->addWidget(autorecovery_groupbox);
+
+    int row = 0;
+
+    autorecovery_layout->addWidget(new QLabel(tr("Enable Auto-Recovery:")), row, 0);
+
+    autorecovery_enabled_ = new QCheckBox();
+    autorecovery_enabled_->setChecked(Config::Current()[QStringLiteral("AutorecoveryEnabled")].toBool());
+    autorecovery_layout->addWidget(autorecovery_enabled_, row, 1);
+
+    row++;
+
+    autorecovery_layout->addWidget(new QLabel(tr("Auto-Recovery Interval:")), row, 0);
+
+    autorecovery_interval_ = new IntegerSlider();
+    autorecovery_interval_->SetMinimum(1);
+    autorecovery_interval_->SetMaximum(60);
+    autorecovery_interval_->SetFormat(tr("%1 minute(s)"));
+    autorecovery_interval_->SetValue(Config::Current()[QStringLiteral("AutorecoveryInterval")].toLongLong());
+    autorecovery_layout->addWidget(autorecovery_interval_, row, 1);
+
+    row++;
+
+    autorecovery_layout->addWidget(new QLabel(tr("Maximum Versions Per Project:")), row, 0);
+
+    autorecovery_maximum_ = new IntegerSlider();
+    autorecovery_maximum_->SetMinimum(1);
+    autorecovery_maximum_->SetMaximum(1000);
+    autorecovery_maximum_->SetValue(Config::Current()[QStringLiteral("AutorecoveryMaximum")].toLongLong());
+    autorecovery_layout->addWidget(autorecovery_maximum_, row, 1);
+
+    row++;
+
+    QPushButton* browse_autorecoveries = new QPushButton(tr("Browse Auto-Recoveries"));
+    connect(browse_autorecoveries, &QPushButton::clicked, Core::instance(), &Core::BrowseAutoRecoveries);
+    autorecovery_layout->addWidget(browse_autorecoveries, row, 1);
+  }
 
   layout->addStretch();
 }
@@ -121,6 +172,11 @@ void PreferencesGeneralTab::Accept(MultiUndoCommand *command)
     Config::Current()[QStringLiteral("Language")] = set_language;
     Core::instance()->SetLanguage(set_language.isEmpty() ? QLocale::system().name() : set_language);
   }
+
+  Config::Current()[QStringLiteral("AutorecoveryEnabled")] = autorecovery_enabled_->isChecked();
+  Config::Current()[QStringLiteral("AutorecoveryInterval")] = QVariant::fromValue(autorecovery_interval_->GetValue());
+  Config::Current()[QStringLiteral("AutorecoveryMaximum")] = QVariant::fromValue(autorecovery_maximum_->GetValue());
+  Core::instance()->SetAutorecoveryInterval(autorecovery_interval_->GetValue());
 }
 
 void PreferencesGeneralTab::AddLanguage(const QString &locale_name)

app/dialog/preferences/tabs/preferencesgeneraltab.h

@@ -28,6 +28,7 @@
 #include "dialog/configbase/configdialogbase.h"
 #include "project/item/sequence/sequence.h"
 #include "widget/slider/floatslider.h"
+#include "widget/slider/integerslider.h"
 
 namespace olive {
 
@@ -50,6 +51,12 @@ private:
 
   FloatSlider* default_still_length_;
 
+  QCheckBox* autorecovery_enabled_;
+
+  IntegerSlider* autorecovery_interval_;
+
+  IntegerSlider* autorecovery_maximum_;
+
 };
 
 }

app/project/project.cpp

@@ -36,6 +36,9 @@ Project::Project() :
   is_modified_(false),
   autorecovery_saved_(true)
 {
+  // Generate UUID for this project
+  uuid_ = QUuid::createUuid();
+
   // Adds a color manager "node" to this project so that it synchronizes
   color_manager_ = new ColorManager();
   color_manager_->setParent(this);
@@ -82,6 +85,10 @@ void Project::Load(QXmlStreamReader *reader, MainWindowLayoutInfo* layout, uint
 
       *layout = MainWindowLayoutInfo::fromXml(reader, xml_node_data);
 
+    } else if (reader->name() == QStringLiteral("uuid")) {
+
+      uuid_ = QUuid::fromString(reader->readElementText());
+
     } else if (reader->name() == QStringLiteral("nodes")) {
 
       while (XMLReadNextStartElement(reader)) {
@@ -149,6 +156,8 @@ void Project::Load(QXmlStreamReader *reader, MainWindowLayoutInfo* layout, uint
 
 void Project::Save(QXmlStreamWriter *writer) const
 {
+  writer->writeTextElement(QStringLiteral("uuid"), uuid_.toString());
+
   writer->writeStartElement(QStringLiteral("nodes"));
 
   foreach (Node* node, nodes()) {
@@ -231,7 +240,7 @@ bool Project::is_modified() const
 void Project::set_modified(bool e)
 {
   is_modified_ = e;
-  autorecovery_saved_ = !e;
+  set_autorecovery_saved(!e);
 
   emit ModifiedChanged(is_modified_);
 }

app/project/project.h

@@ -78,12 +78,19 @@ public:
     return footage_viewer_;
   }
 
+  const QUuid& GetUuid() const
+  {
+    return uuid_;
+  }
+
 signals:
   void NameChanged();
 
   void ModifiedChanged(bool e);
 
 private:
+  QUuid uuid_;
+
   Folder* root_;
 
   QString filename_;

app/task/project/save/save.cpp

@@ -37,8 +37,10 @@ ProjectSaveTask::ProjectSaveTask(Project *project) :
 
 bool ProjectSaveTask::Run()
 {
+  QString using_filename = override_filename_.isEmpty() ? project_->filename() : override_filename_;
+
   // File to temporarily save to (ensures we can't half-write the user's main file and crash)
-  QString temp_save = FileFunctions::GetSafeTemporaryFilename(project_->filename());
+  QString temp_save = FileFunctions::GetSafeTemporaryFilename(using_filename);
 
   QFile project_file(temp_save);
 
@@ -54,7 +56,7 @@ bool ProjectSaveTask::Run()
     // Allows easy integer math for checking project versions.
     writer.writeTextElement(QStringLiteral("version"), QString::number(Core::kProjectVersion));
 
-    writer.writeTextElement("url", project_->filename());
+    writer.writeTextElement("url", using_filename);
 
     writer.writeStartElement(QStringLiteral("project"));
 
@@ -74,11 +76,11 @@ bool ProjectSaveTask::Run()
     }
 
     // Save was successful, we can now rewrite the original file
-    if (FileFunctions::RenameFileAllowOverwrite(temp_save, project_->filename())) {
+    if (FileFunctions::RenameFileAllowOverwrite(temp_save, using_filename)) {
       return true;
     } else {
       SetError(tr("Failed to overwrite \"%1\". Project has been saved as \"%2\" instead.")
-               .arg(project_->filename(), temp_save));
+               .arg(using_filename, temp_save));
       return false;
     }
   } else {

app/task/project/save/save.h

@@ -37,12 +37,19 @@ public:
     return project_;
   }
 
+  void SetOverrideFilename(const QString& filename)
+  {
+    override_filename_ = filename;
+  }
+
 protected:
   virtual bool Run() override;
 
 private:
   Project* project_;
 
+  QString override_filename_;
+
 };
 
 }

app/window/mainwindow/mainwindow.cpp

@@ -635,6 +635,8 @@ void MainWindow::showEvent(QShowEvent *e)
 {
   QMainWindow::showEvent(e);
 
+  QMetaObject::invokeMethod(Core::instance(), "CheckForAutoRecoveries", Qt::QueuedConnection);
+
 #ifdef Q_OS_LINUX
   if (!checked_graphics_vendor_) {
     // Check for nouveau since that driver really doesn't work with Olive