Git: Offer recent list of changes for reset --hard.

This makes it easier to remove changed applied for review
by Gerrit.

Change-Id: I2e3407ae4e74b650d08d53fed37e9aeb11071a4e
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/git/resetdialog.cpp

@@ -0,0 +1,145 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** 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.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**************************************************************************/
+
+#include "resetdialog.h"
+#include "gitplugin.h"
+#include "gitclient.h"
+
+#include <QTreeView>
+#include <QLabel>
+#include <QDialogButtonBox>
+#include <QPushButton>
+#include <QStandardItemModel>
+#include <QItemSelectionModel>
+#include <QVBoxLayout>
+#include <QDir>
+
+namespace Git {
+namespace Internal {
+
+enum Columns
+{
+    Sha1Column,
+    SubjectColumn,
+    ColumnCount
+};
+
+ResetDialog::ResetDialog(QWidget *parent)
+    : QDialog(parent)
+    , m_treeView(new QTreeView(this))
+    , m_model(new QStandardItemModel(0, ColumnCount, this))
+    , m_dialogButtonBox(new QDialogButtonBox(this))
+{
+    QStringList headers;
+    headers << tr("Sha1")<< tr("Subject");
+    m_model->setHorizontalHeaderLabels(headers);
+    QVBoxLayout *layout = new QVBoxLayout(this);
+    layout->addWidget(new QLabel(tr("Reset to:")));
+    m_treeView->setModel(m_model);
+    m_treeView->setMinimumWidth(300);
+    m_treeView->setUniformRowHeights(true);
+    m_treeView->setRootIsDecorated(false);
+    m_treeView->setSelectionBehavior(QAbstractItemView::SelectRows);
+    layout->addWidget(m_treeView);
+    layout->addWidget(m_dialogButtonBox);
+    m_dialogButtonBox->addButton(QDialogButtonBox::Cancel);
+    QPushButton *okButton = m_dialogButtonBox->addButton(QDialogButtonBox::Ok);
+    connect(m_treeView, SIGNAL(doubleClicked(QModelIndex)),
+            okButton, SLOT(animateClick()));
+
+    connect(m_dialogButtonBox, SIGNAL(accepted()), this, SLOT(accept()));
+    connect(m_dialogButtonBox, SIGNAL(rejected()), this, SLOT(reject()));
+
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+    resize(600, 400);
+}
+
+bool ResetDialog::runDialog(const QString &repository)
+{
+    setWindowTitle(tr("Undo Changes to %1").arg(QDir::toNativeSeparators(repository)));
+
+    if (!populateLog(repository) || !m_model->rowCount())
+        return QDialog::Rejected;
+
+    m_treeView->selectionModel()->select(m_model->index(0, 0),
+                                         QItemSelectionModel::SelectCurrent | QItemSelectionModel::Rows);
+
+    return exec() == QDialog::Accepted;
+}
+
+QString ResetDialog::commit() const
+{
+    // Return Sha1, or empty for top commit.
+    if (const QStandardItem *sha1Item = currentItem(Sha1Column))
+        return sha1Item->row() ? sha1Item->text() :  QString();
+    return QString();
+}
+
+bool ResetDialog::populateLog(const QString &repository)
+{
+    if (const int rowCount = m_model->rowCount())
+        m_model->removeRows(0, rowCount);
+
+    // Retrieve log using a custom format "Sha1:Subject"
+    GitClient *client = GitPlugin::instance()->gitClient();
+    QStringList arguments;
+    arguments << QLatin1String("--max-count=30") << QLatin1String("--format=%h:%s");
+    QString output;
+    if (!client->synchronousLog(repository, arguments, &output))
+        return false;
+    foreach (const QString &line, output.split(QLatin1Char('\n'))) {
+        const int colonPos = line.indexOf(QLatin1Char(':'));
+        if (colonPos != -1) {
+            QList<QStandardItem *> row;
+            for (int c = 0; c < ColumnCount; ++c) {
+                QStandardItem *item = new QStandardItem;
+                item->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable);
+                row.push_back(item);
+            }
+            row[Sha1Column]->setText(line.left(colonPos));
+            row[SubjectColumn]->setText(line.right(line.size() - colonPos - 1));
+            m_model->appendRow(row);
+        }
+    }
+    return true;
+}
+
+const QStandardItem *ResetDialog::currentItem(int column) const
+{
+    const QModelIndex currentIndex = m_treeView->selectionModel()->currentIndex();
+    if (currentIndex.isValid())
+        return m_model->item(currentIndex.row(), column);
+    return 0;
+}
+
+} // namespace Internal
+} // namespace Git