VCS[git]: Add support for stashes.

Add non-modal stash management dialog and additional menu option
"Stash snapshot..." to stash away changes prompting for a description,
which will immediately replay the stash (take snapshot and continue
working).
Add interface to IVersionControl for creating/restoring/deleting
snapshots for backup/complex undo operations (currently supported
by git only). Add test options to VCSBasePlugin.
Clean up and extend git client accordingly.

src/plugins/git/gitutils.cpp

@@ -0,0 +1,104 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#include "gitutils.h"
+
+#include <QtCore/QDebug>
+#include <QtCore/QStringList>
+#include <QtGui/QInputDialog>
+#include <QtGui/QLineEdit>
+
+namespace Git {
+namespace Internal {
+
+QDebug operator<<(QDebug d, const Stash &s)
+{
+    QDebug nospace = d.nospace();
+    nospace << "name=" << s.name << " branch=" << s.branch << " message=" << s.message;
+    return d;
+}
+
+void Stash::clear()
+{
+    name.clear();
+    branch.clear();
+    message.clear();
+}
+
+/* Parse a stash line in its 2 manifestations (with message/without message containing
+ * <base_sha1>+subject):
+\code
+stash@{1}: WIP on <branch>: <base_sha1> <subject_base_sha1>
+stash@{2}: On <branch>: <message>
+\endcode */
+
+bool Stash::parseStashLine(const QString &l)
+{
+    const QChar colon = QLatin1Char(':');
+    const int branchPos = l.indexOf(colon);
+    if (branchPos < 0)
+        return false;
+    const int messagePos = l.indexOf(colon, branchPos + 1);
+    if (messagePos < 0)
+        return false;
+    // Name
+    const QString newName = l.left(branchPos);
+    // Branch spec
+    const QString branchSpec = l.mid(branchPos + 1, messagePos - branchPos - 1);
+    const bool emptyMessage = branchSpec.contains(QLatin1String("WIP")); // "Work in Progress or sth"
+    const int onIndex = branchSpec.indexOf(QLatin1String("on "), 0, Qt::CaseInsensitive);
+    if (onIndex == -1)
+        return false;
+    const QString newBranch = branchSpec.mid(onIndex + 3);
+    // Happy!
+    name = newName;
+    branch = newBranch;
+    if (!emptyMessage)
+        message = l.mid(messagePos + 2); // skip blank
+    return true;
+}
+
+// Make QInputDialog  play nicely, widen it a bit.
+bool inputText(QWidget *parent, const QString &title, const QString &prompt, QString *s)
+{
+    QInputDialog dialog(parent);
+    dialog.setWindowFlags(dialog.windowFlags() & ~Qt::WindowContextHelpButtonHint);
+    dialog.setWindowTitle(title);
+    dialog.setLabelText(prompt);
+    dialog.setTextValue(*s);
+    // Nasty hack:
+    if (QLineEdit *le = qFindChild<QLineEdit*>(&dialog))
+        le->setMinimumWidth(500);
+    if (dialog.exec() != QDialog::Accepted)
+        return false;
+    *s = dialog.textValue();
+    return true;
+}
+} // namespace Internal
+} // namespace Git