add auto-saving of modified editors

Task-number: QTCREATORBUG-2847

src/plugins/bineditor/bineditorplugin.cpp

@@ -203,8 +203,9 @@ public:
         return QLatin1String(Constants::C_BINEDITOR_MIMETYPE);
     }
 
-    bool save(QString *errorString, const QString &fileName = QString())
+    bool save(QString *errorString, const QString &fileName, bool autoSave)
     {
+        QTC_ASSERT(!autoSave, return true); // bineditor does not support autosave - it would be a bit expensive
         const QString fileNameToUse
             = fileName.isEmpty() ? m_fileName : fileName;
         if (m_editor->save(errorString, m_fileName, fileNameToUse)) {
@@ -363,7 +364,8 @@ public:
         m_file->setFilename(QString());
         return true;
     }
-    bool open(QString *errorString, const QString &fileName = QString()) {
+    bool open(QString *errorString, const QString &fileName, const QString &realFileName) {
+        QTC_ASSERT(fileName == realFileName, return false); // The bineditor can do no autosaving
         return m_file->open(errorString, fileName);
     }
     Core::IFile *file() { return m_file; }

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -738,12 +738,13 @@ CMakeFile::CMakeFile(CMakeProject *parent, QString fileName)
 
 }
 
-bool CMakeFile::save(QString *errorString, const QString &fileName)
+bool CMakeFile::save(QString *errorString, const QString &fileName, bool autoSave)
 {
     // Once we have an texteditor open for this file, we probably do
     // need to implement this, don't we.
     Q_UNUSED(errorString)
     Q_UNUSED(fileName)
+    Q_UNUSED(autoSave)
     return false;
 }
 

src/plugins/cmakeprojectmanager/cmakeproject.h

@@ -199,7 +199,7 @@ class CMakeFile : public Core::IFile
 public:
     CMakeFile(CMakeProject *parent, QString fileName);
 
-    bool save(QString *errorString, const QString &fileName = QString());
+    bool save(QString *errorString, const QString &fileName, bool autoSave);
     QString fileName() const;
 
     QString defaultPath() const;

src/plugins/coreplugin/editormanager/editormanager.cpp

@@ -64,6 +64,7 @@
 #include <utils/consoleprocess.h>
 #include <utils/qtcassert.h>
 
+#include <QtCore/QDateTime>
 #include <QtCore/QDebug>
 #include <QtCore/QFileInfo>
 #include <QtCore/QMap>
@@ -71,6 +72,7 @@
 #include <QtCore/QSet>
 #include <QtCore/QSettings>
 #include <QtCore/QTextCodec>
+#include <QtCore/QTimer>
 
 #include <QtGui/QAction>
 #include <QtGui/QShortcut>
@@ -190,6 +192,7 @@ struct EditorManagerPrivate {
     Internal::SplitterOrView *m_splitter;
     QPointer<IEditor> m_currentEditor;
     QPointer<SplitterOrView> m_currentView;
+    QTimer *m_autoSaveTimer;
 
     ICore *m_core;
 
@@ -222,12 +225,16 @@ struct EditorManagerPrivate {
     IFile::ReloadSetting m_reloadSetting;
 
     QString m_titleAddition;
+
+    bool m_autoSaveEnabled;
+    int m_autoSaveInterval;
 };
 }
 
 EditorManagerPrivate::EditorManagerPrivate(ICore *core, QWidget *parent) :
     m_view(0),
     m_splitter(0),
+    m_autoSaveTimer(0),
     m_core(core),
     m_revertToSavedAction(new QAction(EditorManager::tr("Revert to Saved"), parent)),
     m_saveAction(new QAction(parent)),
@@ -241,7 +248,9 @@ EditorManagerPrivate::EditorManagerPrivate(ICore *core, QWidget *parent) :
     m_goForwardAction(new QAction(QIcon(QLatin1String(Constants::ICON_NEXT)), EditorManager::tr("Go Forward"), parent)),
     m_windowPopup(0),
     m_coreListener(0),
-    m_reloadSetting(IFile::AlwaysAsk)
+    m_reloadSetting(IFile::AlwaysAsk),
+    m_autoSaveEnabled(true),
+    m_autoSaveInterval(5)
 {
     m_editorModel = new OpenEditorsModel(parent);
 }
@@ -448,6 +457,10 @@ EditorManager::EditorManager(ICore *core, QWidget *parent) :
     updateActions();
 
     m_d->m_windowPopup = new OpenEditorsWindow(this);
+
+    m_d->m_autoSaveTimer = new QTimer(this);
+    connect(m_d->m_autoSaveTimer, SIGNAL(timeout()), SLOT(autoSave()));
+    updateAutoSave();
 }
 
 EditorManager::~EditorManager()
@@ -486,6 +499,13 @@ void EditorManager::init()
             this, SLOT(updateVariable(QString)));
 }
 
+void EditorManager::updateAutoSave()
+{
+    if (m_d->m_autoSaveEnabled)
+        m_d->m_autoSaveTimer->start(m_d->m_autoSaveInterval * (60 * 1000));
+    else
+        m_d->m_autoSaveTimer->stop();
+}
 
 EditorToolBar *EditorManager::createToolBar(QWidget *parent)
 {
@@ -1187,6 +1207,11 @@ int extractLineNumber(QString *fileName)
     return -1;
 }
 
+static QString autoSaveName(const QString &fileName)
+{
+    return fileName + QLatin1String(".autosave");
+}
+
 IEditor *EditorManager::openEditor(Core::Internal::EditorView *view, const QString &fileName,
                         const QString &editorId, OpenEditorFlags flags, bool *newEditor)
 {
@@ -1212,6 +1237,14 @@ IEditor *EditorManager::openEditor(Core::Internal::EditorView *view, const QStri
         return activateEditor(view, editor, flags);
     }
 
+    QString realFn = autoSaveName(fn);
+    QFileInfo fi(fn);
+    QFileInfo rfi(realFn);
+    if (!fi.exists() || !rfi.exists() || fi.lastModified() >= rfi.lastModified()) {
+        QFile::remove(realFn);
+        realFn = fn;
+    }
+
     IEditor *editor = createEditor(editorId, fn);
     // If we could not open the file in the requested editor, fall
     // back to the default editor:
@@ -1222,12 +1255,14 @@ IEditor *EditorManager::openEditor(Core::Internal::EditorView *view, const QStri
 
     QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
     QString errorString;
-    if (!editor->open(&errorString, fn)) {
+    if (!editor->open(&errorString, fn, realFn)) {
         QApplication::restoreOverrideCursor();
         QMessageBox::critical(m_d->m_core->mainWindow(), tr("File Error"), errorString);
         delete editor;
         return 0;
     }
+    if (realFn != fn)
+        editor->file()->setRestoredFrom(realFn);
     addEditor(editor);
 
     if (newEditor)
@@ -1402,6 +1437,25 @@ bool EditorManager::saveFile(IFile *fileParam)
     return success;
 }
 
+void EditorManager::autoSave()
+{
+    QStringList errors;
+    // FIXME: the saving should be staggered
+    foreach (IEditor *editor, openedEditors()) {
+        IFile *file = editor->file();
+        if (!file->isModified() || !file->shouldAutoSave())
+            continue;
+        if (file->fileName().isEmpty()) // FIXME: save them to a dedicated directory
+            continue;
+        QString errorString;
+        if (!file->autoSave(&errorString, autoSaveName(file->fileName())))
+            errors << errorString;
+    }
+    if (!errors.isEmpty())
+        QMessageBox::critical(m_d->m_core->mainWindow(), tr("File Error"),
+                              errors.join(QLatin1String("\n")));
+}
+
 MakeWritableResult
 EditorManager::makeFileWritable(IFile *file)
 {
@@ -1549,8 +1603,11 @@ void EditorManager::updateWindowTitle()
 void EditorManager::handleEditorStateChange()
 {
     updateActions();
+    IEditor *theEditor = qobject_cast<IEditor *>(sender());
+    if (!theEditor->file()->isModified())
+        theEditor->file()->removeAutoSaveFile();
     IEditor *currEditor = currentEditor();
-    if (qobject_cast<IEditor *>(sender()) == currEditor) {
+    if (theEditor == currEditor) {
         updateWindowTitle();
         emit currentEditorStateChanged(currEditor);
     }
@@ -1771,8 +1828,15 @@ bool EditorManager::restoreState(const QByteArray &state)
         QByteArray id;
         stream >> id;
 
-        if (!fileName.isEmpty() && !displayName.isEmpty())
-            m_d->m_editorModel->addRestoredEditor(fileName, displayName, QString::fromUtf8(id));
+        if (!fileName.isEmpty() && !displayName.isEmpty()) {
+            QFileInfo fi(fileName);
+            QFileInfo rfi(autoSaveName(fileName));
+            if (fi.exists() && rfi.exists() && fi.lastModified() < rfi.lastModified()) {
+                openEditor(fileName, QString::fromUtf8(id));
+            } else {
+                m_d->m_editorModel->addRestoredEditor(fileName, displayName, QString::fromUtf8(id));
+            }
+        }
     }
 
     QByteArray splitterstates;
@@ -1796,12 +1860,16 @@ bool EditorManager::restoreState(const QByteArray &state)
 
 static const char documentStatesKey[] = "EditorManager/DocumentStates";
 static const char reloadBehaviorKey[] = "EditorManager/ReloadBehavior";
+static const char autoSaveEnabledKey[] = "EditorManager/AutoSaveEnabled";
+static const char autoSaveIntervalKey[] = "EditorManager/AutoSaveInterval";
 
 void EditorManager::saveSettings()
 {
     SettingsDatabase *settings = m_d->m_core->settingsDatabase();
     settings->setValue(QLatin1String(documentStatesKey), m_d->m_editorStates);
     settings->setValue(QLatin1String(reloadBehaviorKey), m_d->m_reloadSetting);
+    settings->setValue(QLatin1String(autoSaveEnabledKey), m_d->m_autoSaveEnabled);
+    settings->setValue(QLatin1String(autoSaveIntervalKey), m_d->m_autoSaveInterval);
 }
 
 void EditorManager::readSettings()
@@ -1821,6 +1889,12 @@ void EditorManager::readSettings()
 
     if (settings->contains(QLatin1String(reloadBehaviorKey)))
         m_d->m_reloadSetting = (IFile::ReloadSetting)settings->value(QLatin1String(reloadBehaviorKey)).toInt();
+
+    if (settings->contains(QLatin1String(autoSaveEnabledKey))) {
+        m_d->m_autoSaveEnabled = settings->value(QLatin1String(autoSaveEnabledKey)).toBool();
+        m_d->m_autoSaveInterval = settings->value(QLatin1String(autoSaveIntervalKey)).toInt();
+    }
+    updateAutoSave();
 }
 
 
@@ -1873,6 +1947,28 @@ IFile::ReloadSetting EditorManager::reloadSetting() const
     return m_d->m_reloadSetting;
 }
 
+void EditorManager::setAutoSaveEnabled(bool enabled)
+{
+    m_d->m_autoSaveEnabled = enabled;
+    updateAutoSave();
+}
+
+bool EditorManager::autoSaveEnabled() const
+{
+    return m_d->m_autoSaveEnabled;
+}
+
+void EditorManager::setAutoSaveInterval(int interval)
+{
+    m_d->m_autoSaveInterval = interval;
+    updateAutoSave();
+}
+
+int EditorManager::autoSaveInterval() const
+{
+    return m_d->m_autoSaveInterval;
+}
+
 QTextCodec *EditorManager::defaultTextCodec() const
 {
     QSettings *settings = Core::ICore::instance()->settings();

src/plugins/coreplugin/editormanager/editormanager.h

@@ -178,6 +178,11 @@ public:
     void setReloadSetting(IFile::ReloadSetting behavior);
     IFile::ReloadSetting reloadSetting() const;
 
+    void setAutoSaveEnabled(bool enabled);
+    bool autoSaveEnabled() const;
+    void setAutoSaveInterval(int interval);
+    int autoSaveInterval() const;
+
     QTextCodec *defaultTextCodec() const;
 
     static qint64 maxTextFileSize();
@@ -211,6 +216,7 @@ private slots:
     void updateWindowTitle();
     void handleEditorStateChange();
     void updateVariable(const QString &variable);
+    void autoSave();
 
 public slots:
     void goBackInNavigationHistory();
@@ -251,6 +257,7 @@ private:
     IEditor *pickUnusedEditor() const;
     void addFileToRecentFiles(IFile *file);
     void switchToPreferedMode();
+    void updateAutoSave();
 
     static EditorManager *m_instance;
     EditorManagerPrivate *m_d;

src/plugins/coreplugin/editormanager/ieditor.h

@@ -50,7 +50,7 @@ public:
     virtual ~IEditor() {}
 
     virtual bool createNew(const QString &contents = QString()) = 0;
-    virtual bool open(QString *errorString, const QString &fileName = QString()) = 0;
+    virtual bool open(QString *errorString, const QString &fileName, const QString &realFileName) = 0;
     virtual IFile *file() = 0;
     virtual QString id() const = 0;
     virtual QString displayName() const = 0;

src/plugins/coreplugin/filemanager.cpp

@@ -624,7 +624,7 @@ bool FileManager::saveFile(IFile *file, const QString &fileName, bool *isReadOnl
     bool addWatcher = removeFile(file); // So that our own IFile gets no notification at all
 
     QString errorString;
-    if (!file->save(&errorString, fileName)) {
+    if (!file->save(&errorString, fileName, false)) {
         if (isReadOnly) {
             QFile ofi(effName);
             // Check whether the existing file is writable

src/plugins/coreplugin/generalsettings.cpp

@@ -151,6 +151,9 @@ QWidget *GeneralSettings::createPage(QWidget *parent)
     m_page->helpExternalFileBrowserButton->hide();
 #endif
 
+    m_page->autoSaveCheckBox->setChecked(EditorManager::instance()->autoSaveEnabled());
+    m_page->autoSaveInterval->setValue(EditorManager::instance()->autoSaveInterval());
+
     connect(m_page->resetButton, SIGNAL(clicked()),
             this, SLOT(resetInterfaceColor()));
 #ifdef Q_OS_UNIX
@@ -199,6 +202,8 @@ void GeneralSettings::apply()
     Utils::UnixUtils::setFileBrowser(Core::ICore::instance()->settings(), m_page->externalFileBrowserEdit->text());
 #endif
 #endif
+    EditorManager::instance()->setAutoSaveEnabled(m_page->autoSaveCheckBox->isChecked());
+    EditorManager::instance()->setAutoSaveInterval(m_page->autoSaveInterval->value());
 }
 
 void GeneralSettings::finish()

src/plugins/coreplugin/generalsettings.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>527</width>
-    <height>295</height>
+    <height>306</height>
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
@@ -213,6 +213,69 @@
         </property>
        </widget>
       </item>
+      <item row="3" column="0" colspan="4">
+       <layout class="QHBoxLayout" name="horizontalLayout_5">
+        <item>
+         <widget class="QCheckBox" name="autoSaveCheckBox">
+          <property name="toolTip">
+           <string>If checked, temporary copies of modified files will be created automatically. If Qt Creator is restarted after a crash or power failure, it will ask whether the auto-saved content should be recovered.</string>
+          </property>
+          <property name="text">
+           <string>Auto-save modified files</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <spacer name="horizontalSpacer_6">
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+          <property name="sizeType">
+           <enum>QSizePolicy::Fixed</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>20</width>
+            <height>20</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
+        <item>
+         <widget class="QLabel" name="autoSaveIntervalLabel">
+          <property name="text">
+           <string>Interval:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QSpinBox" name="autoSaveInterval">
+          <property name="suffix">
+           <string extracomment="unit for minutes">min</string>
+          </property>
+          <property name="minimum">
+           <number>1</number>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <spacer name="horizontalSpacer_5">
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>40</width>
+            <height>20</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
+       </layout>
+      </item>
      </layout>
     </widget>
    </item>
@@ -252,5 +315,22 @@
  <resources>
   <include location="core.qrc"/>
  </resources>
- <connections/>
+ <connections>
+  <connection>
+   <sender>autoSaveCheckBox</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>autoSaveInterval</receiver>
+   <slot>setEnabled(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>161</x>
+     <y>262</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>342</x>
+     <y>263</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
 </ui>

src/plugins/coreplugin/ifile.cpp

@@ -34,14 +34,17 @@
 
 #include "infobar.h"
 
+#include <QtCore/QFile>
+
 namespace Core {
 
-IFile::IFile(QObject *parent) : QObject(parent), m_infoBar(0), m_hasWriteWarning(false)
+IFile::IFile(QObject *parent) : QObject(parent), m_infoBar(0), m_hasWriteWarning(false), m_restored(false)
 {
 }
 
 IFile::~IFile()
 {
+    removeAutoSaveFile();
     delete m_infoBar;
 }
 
@@ -58,6 +61,43 @@ void IFile::checkPermissions()
 {
 }
 
+bool IFile::shouldAutoSave() const
+{
+    return false;
+}
+
+bool IFile::autoSave(QString *errorString, const QString &fileName)
+{
+    if (!save(errorString, fileName, true))
+        return false;
+    m_autoSaveName = fileName;
+    return true;
+}
+
+static const char kRestoredAutoSave[] = "RestoredAutoSave";
+
+void IFile::setRestoredFrom(const QString &name)
+{
+    m_autoSaveName = name;
+    m_restored = true;
+    InfoBarEntry info(QLatin1String(kRestoredAutoSave),
+          tr("File was restored from auto-saved copy. "
+             "Use <i>Save</i> to confirm, or <i>Revert to Saved</i> to discard changes."));
+    infoBar()->addInfo(info);
+}
+
+void IFile::removeAutoSaveFile()
+{
+    if (!m_autoSaveName.isEmpty()) {
+        QFile::remove(m_autoSaveName);
+        m_autoSaveName.clear();
+        if (m_restored) {
+            m_restored = false;
+            infoBar()->removeInfo(QLatin1String(kRestoredAutoSave));
+        }
+    }
+}
+
 InfoBar *IFile::infoBar()
 {
     if (!m_infoBar)

src/plugins/coreplugin/ifile.h

@@ -84,13 +84,14 @@ public:
     IFile(QObject *parent = 0);
     virtual ~IFile();
 
-    virtual bool save(QString *errorString, const QString &fileName = QString()) = 0;
+    virtual bool save(QString *errorString, const QString &fileName = QString(), bool autoSave = false) = 0;
     virtual QString fileName() const = 0;
 
     virtual QString defaultPath() const = 0;
     virtual QString suggestedFileName() const = 0;
     virtual QString mimeType() const = 0;
 
+    virtual bool shouldAutoSave() const;
     virtual bool isModified() const = 0;
     virtual bool isReadOnly() const = 0;
     virtual bool isSaveAsAllowed() const = 0;
@@ -101,6 +102,10 @@ public:
 
     virtual void checkPermissions();
 
+    bool autoSave(QString *errorString, const QString &fileName);
+    void setRestoredFrom(const QString &name);
+    void removeAutoSaveFile();
+
     bool hasWriteWarning() const { return m_hasWriteWarning; }
     void setWriteWarning(bool has) { m_hasWriteWarning = has; }
 
@@ -113,8 +118,10 @@ signals:
     void reloaded();
 
 private:
+    QString m_autoSaveName;
     InfoBar *m_infoBar;
     bool m_hasWriteWarning;
+    bool m_restored;
 };
 
 } // namespace Core

src/plugins/cppeditor/cppeditor.cpp

@@ -1746,9 +1746,9 @@ QString CPPEditor::id() const
     return QLatin1String(CppEditor::Constants::CPPEDITOR_ID);
 }
 
-bool CPPEditor::open(QString *errorString, const QString & fileName)
+bool CPPEditor::open(QString *errorString, const QString &fileName, const QString &realFileName)
 {
-    bool b = TextEditor::BaseTextEditor::open(errorString, fileName);
+    bool b = TextEditor::BaseTextEditor::open(errorString, fileName, realFileName);
     editorWidget()->setMimeType(Core::ICore::instance()->mimeDatabase()->findByFile(QFileInfo(fileName)).type());
     return b;
 }

src/plugins/cppeditor/cppeditor.h

@@ -152,7 +152,7 @@ public:
     QString id() const;
 
     bool isTemporary() const { return false; }
-    virtual bool open(QString *errorString, const QString & fileName);
+    virtual bool open(QString *errorString, const QString &fileName, const QString &realFileName);
 };
 
 class CPPEditorWidget : public TextEditor::BaseTextEditorWidget

src/plugins/designer/formwindoweditor.cpp

@@ -124,15 +124,16 @@ bool FormWindowEditor::createNew(const QString &contents)
 
     syncXmlEditor(contents);
     d->m_file.setFileName(QString());
+    d->m_file.setShouldAutoSave(false);
     return true;
 }
 
 void FormWindowEditor::slotOpen(QString *errorString, const QString &fileName)
 {
-    open(errorString, fileName);
+    open(errorString, fileName, fileName);
 }
 
-bool FormWindowEditor::open(QString *errorString, const QString &fileName)
+bool FormWindowEditor::open(QString *errorString, const QString &fileName, const QString &realFileName)