Vcs: Add Fossil SCM integration plugin

* Qt Creator base-commit: f77af5e336
* Stand-alone plugin source tree for integration into qtc super-project
* Original release: https://github.com/nomadbyte/qtcreator-plugin-fossil
* Adapted from Bazaar plugin implementation

Configuring Fossil
------------------

1. Download the [Fossil SCM client](http://fossil-scm.org) and install `fossil`
   executable file in your `PATH`.

2. Create or designate a directory to store local Fossil repositories and
   remote clones. For example: `~/fossils/qt`.

3. Configure Version Control Options for the Fossil plugin to use
   the designated directory as `Local Repositories Default path`.

Now Fossil should become available as a VCS choice to create new local
repositories, as well as a choice in `New File or Project` to clone a
remote Fossil repository.

Change-Id: I630184c1b344184d9e08ae2fc24a5e4766f834b9
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

plugins/fossil/pullorpushdialog.cpp

@@ -0,0 +1,110 @@
+/****************************************************************************
+**
+** Copyright (c) 2016 Artur Shepilko
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "pullorpushdialog.h"
+#include "ui_pullorpushdialog.h"
+
+#include "constants.h"
+
+#include <utils/qtcassert.h>
+
+namespace Fossil {
+namespace Internal {
+
+PullOrPushDialog::PullOrPushDialog(Mode mode, QWidget *parent) : QDialog(parent),
+    m_mode(mode),
+    m_ui(new Ui::PullOrPushDialog)
+{
+    m_ui->setupUi(this);
+    m_ui->localPathChooser->setExpectedKind(Utils::PathChooser::File);
+    m_ui->localPathChooser->setPromptDialogFilter(tr(Constants::FOSSIL_FILE_FILTER));
+
+    switch (m_mode) {
+    case PullMode:
+        this->setWindowTitle(tr("Pull Source"));
+        break;
+    case PushMode:
+        this->setWindowTitle(tr("Push Destination"));
+        break;
+    }
+
+    // select URL text in line edit when clicking the radio button
+    m_ui->localButton->setFocusProxy(m_ui->localPathChooser);
+    m_ui->urlButton->setFocusProxy(m_ui->urlLineEdit);
+    connect(m_ui->urlButton, &QRadioButton::clicked, m_ui->urlLineEdit, &QLineEdit::selectAll);
+
+    this->adjustSize();
+}
+
+PullOrPushDialog::~PullOrPushDialog()
+{
+    delete m_ui;
+}
+
+QString PullOrPushDialog::remoteLocation() const
+{
+    if (m_ui->defaultButton->isChecked())
+        return QString();
+    if (m_ui->localButton->isChecked())
+        return m_ui->localPathChooser->path();
+    return m_ui->urlLineEdit->text();
+}
+
+bool PullOrPushDialog::isRememberOptionEnabled() const
+{
+    if (m_ui->defaultButton->isChecked())
+        return false;
+    return m_ui->rememberCheckBox->isChecked();
+}
+
+bool PullOrPushDialog::isPrivateOptionEnabled() const
+{
+    return m_ui->privateCheckBox->isChecked();
+}
+
+void PullOrPushDialog::setDefaultRemoteLocation(const QString &url)
+{
+    m_ui->urlLineEdit->setText(url);
+}
+
+void PullOrPushDialog::setLocalBaseDirectory(const QString &dir)
+{
+    m_ui->localPathChooser->setBaseDirectory(dir);
+}
+
+void PullOrPushDialog::changeEvent(QEvent *e)
+{
+    QDialog::changeEvent(e);
+    switch (e->type()) {
+    case QEvent::LanguageChange:
+        m_ui->retranslateUi(this);
+        break;
+    default:
+        break;
+    }
+}
+
+} // namespace Internal
+} // namespace Fossil