VCS[hg, git]: Add support for repository creation.

Add repository creation operation to IVersionControl, implement for hg
and git, add convenience slot with prompts to VCSBasePlugin.
Add respective menu options and make menus are visible in case no VCS is
active.
Change project wizards extension page to list VCS that are capable of
repository creation in a QComboBox in case the directory is not managed
by another VCS (in which case it lists that one for operation 'add').
On that occasion, polish the Project selection to use a QComboBox as
well and add some smartness to find the most suitable project to add via
path matching.

src/plugins/vcsbase/vcsbaseplugin.cpp

@@ -47,6 +47,8 @@
 
 #include <QtGui/QAction>
 #include <QtGui/QMessageBox>
+#include <QtGui/QFileDialog>
+#include <QtGui/QMainWindow>
 
 enum { debug = 0 };
 
@@ -345,6 +347,8 @@ VCSBASE_EXPORT QDebug operator<<(QDebug in, const VCSBasePluginState &state)
 struct VCSBasePluginPrivate {
     explicit VCSBasePluginPrivate(const QString &submitEditorId);
 
+    inline bool supportsRepositoryCreation() const;
+
     const QString m_submitEditorId;
     Core::IVersionControl *m_versionControl;
     VCSBasePluginState m_state;
@@ -360,6 +364,11 @@ VCSBasePluginPrivate::VCSBasePluginPrivate(const QString &submitEditorId) :
 {
 }
 
+bool VCSBasePluginPrivate::supportsRepositoryCreation() const
+{
+    return m_versionControl && m_versionControl->supportsOperation(Core::IVersionControl::CreateRepositoryOperation);
+}
+
 Internal::StateListener *VCSBasePluginPrivate::m_listener = 0;
 
 VCSBasePlugin::VCSBasePlugin(const QString &submitEditorId) :
@@ -427,15 +436,17 @@ const VCSBasePluginState &VCSBasePlugin::currentState() const
     return d->m_state;
 }
 
-bool VCSBasePlugin::enableMenuAction(ActionState as, QAction *menuAction)
+bool VCSBasePlugin::enableMenuAction(ActionState as, QAction *menuAction) const
 {
     if (debug)
         qDebug() << "enableMenuAction" << menuAction->text() << as;
     switch (as) {
-    case VCSBase::VCSBasePlugin::NoVCSEnabled:
+    case VCSBase::VCSBasePlugin::NoVCSEnabled: {
+        const bool supportsCreation = d->supportsRepositoryCreation();
         menuAction->setVisible(true);
-        menuAction->setEnabled(false);
-        return false;
+        menuAction->setEnabled(supportsCreation);
+        return supportsCreation;
+    }
     case VCSBase::VCSBasePlugin::OtherVCSEnabled:
         menuAction->setVisible(false);
         return false;
@@ -456,6 +467,46 @@ void VCSBasePlugin::promptToDeleteCurrentFile()
         QMessageBox::warning(0, tr("Version Control"), tr("The file '%1' could not be deleted.").arg(state.currentFile()), QMessageBox::Ok);
 }
 
+static inline bool ask(QWidget *parent, const QString &title, const QString &question, bool defaultValue = true)
+
+{
+    const QMessageBox::StandardButton defaultButton = defaultValue ? QMessageBox::Yes : QMessageBox::No;
+    return QMessageBox::question(parent, title, question, QMessageBox::Yes|QMessageBox::No, defaultButton) == QMessageBox::Yes;
+}
+
+void VCSBasePlugin::createRepository()
+{
+    QTC_ASSERT(d->m_versionControl->supportsOperation(Core::IVersionControl::CreateRepositoryOperation), return);
+    // Find current starting directory
+    QString directory;
+    if (const ProjectExplorer::Project *currentProject = ProjectExplorer::ProjectExplorerPlugin::instance()->currentProject())
+        directory = QFileInfo(currentProject->file()->fileName()).absolutePath();
+    // Prompt for a directory that is not under version control yet
+    QMainWindow *mw = Core::ICore::instance()->mainWindow();
+    do {
+        directory = QFileDialog::getExistingDirectory(mw, tr("Choose repository directory"), directory);
+        if (directory.isEmpty())
+            return;
+        const Core::IVersionControl *managingControl = Core::ICore::instance()->vcsManager()->findVersionControlForDirectory(directory);
+        if (managingControl == 0)
+            break;
+        const QString question = tr("The directory '%1' is already managed by a version control system (%2)."
+                                    " Would you like to specify another directory?").arg(directory, managingControl->displayName());
+
+        if (!ask(mw, tr("Repository already under version control"), question))
+            return;
+    } while (true);
+    // Create
+    const bool rc = d->m_versionControl->vcsCreateRepository(directory);
+    if (rc) {
+        QMessageBox::information(mw, tr("Repository created"),
+                                 tr("A version control repository has been created in %1.").arg(directory));
+    } else {
+        QMessageBox::warning(mw, tr("Repository creation failed"),
+                                 tr("A version control repository could not be created in %1.").arg(directory));
+    }
+}
+
 } // namespace VCSBase
 
 #include "vcsbaseplugin.moc"