Enable macro editing for the Clang indexer

Refactor much of the code from Environment* classes to NameValue* classes
to share it with the preprocessor macro settings.

Change-Id: Ica4ee817aa338230c422b30d91240d266248d226
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/utils/namevaluesdialog.cpp

@@ -0,0 +1,147 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** 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 "namevaluesdialog.h"
+
+#include <utils/environment.h>
+#include <utils/hostosinfo.h>
+
+#include <QDialogButtonBox>
+#include <QLabel>
+#include <QPlainTextEdit>
+#include <QVBoxLayout>
+
+namespace Utils {
+
+namespace Internal {
+
+static EnvironmentItems cleanUp(const EnvironmentItems &items)
+{
+    EnvironmentItems uniqueItems;
+    QSet<QString> uniqueSet;
+    for (int i = items.count() - 1; i >= 0; i--) {
+        EnvironmentItem item = items.at(i);
+        if (HostOsInfo::isWindowsHost())
+            item.name = item.name.toUpper();
+        const QString &itemName = item.name;
+        QString emptyName = itemName;
+        emptyName.remove(QLatin1Char(' '));
+        if (!emptyName.isEmpty() && !uniqueSet.contains(itemName)) {
+            uniqueItems.prepend(item);
+            uniqueSet.insert(itemName);
+        }
+    }
+    return uniqueItems;
+}
+
+NameValueItemsWidget::NameValueItemsWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    m_editor = new QPlainTextEdit(this);
+    auto layout = new QVBoxLayout(this);
+    layout->setMargin(0);
+    layout->addWidget(m_editor);
+}
+
+void NameValueItemsWidget::setEnvironmentItems(const EnvironmentItems &items)
+{
+    EnvironmentItems sortedItems = items;
+    EnvironmentItem::sort(&sortedItems);
+    const QStringList list = EnvironmentItem::toStringList(sortedItems);
+    m_editor->document()->setPlainText(list.join(QLatin1Char('\n')));
+}
+
+EnvironmentItems NameValueItemsWidget::environmentItems() const
+{
+    const QStringList list = m_editor->document()->toPlainText().split(QLatin1String("\n"));
+    EnvironmentItems items = EnvironmentItem::fromStringList(list);
+    return cleanUp(items);
+}
+
+void NameValueItemsWidget::setPlaceholderText(const QString &text)
+{
+    m_editor->setPlaceholderText(text);
+}
+} // namespace Internal
+
+NameValuesDialog::NameValuesDialog(const QString &windowTitle, const QString &helpText, QWidget *parent)
+    : QDialog(parent)
+{
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+    resize(640, 480);
+    m_editor = new Internal::NameValueItemsWidget(this);
+    auto box = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel,
+                                    Qt::Horizontal,
+                                    this);
+    connect(box, &QDialogButtonBox::accepted, this, &QDialog::accept);
+    connect(box, &QDialogButtonBox::rejected, this, &QDialog::reject);
+
+    auto helpLabel = new QLabel(this);
+    helpLabel->setText(helpText);
+
+    auto layout = new QVBoxLayout(this);
+    layout->addWidget(m_editor);
+    layout->addWidget(helpLabel);
+
+    layout->addWidget(box);
+
+    setWindowTitle(windowTitle);
+}
+
+void NameValuesDialog::setNameValueItems(const EnvironmentItems &items)
+{
+    m_editor->setEnvironmentItems(items);
+}
+
+EnvironmentItems NameValuesDialog::nameValueItems() const
+{
+    return m_editor->environmentItems();
+}
+
+void NameValuesDialog::setPlaceholderText(const QString &text)
+{
+    m_editor->setPlaceholderText(text);
+}
+
+Utils::optional<NameValueItems> NameValuesDialog::getNameValueItems(QWidget *parent,
+                                                                    const NameValueItems &initial,
+                                                                    const QString &placeholderText,
+                                                                    Polisher polisher,
+                                                                    const QString &windowTitle,
+                                                                    const QString &helpText)
+{
+    NameValuesDialog dialog(windowTitle, helpText, parent);
+    if (polisher)
+        polisher(&dialog);
+    dialog.setNameValueItems(initial);
+    dialog.setPlaceholderText(placeholderText);
+    bool result = dialog.exec() == QDialog::Accepted;
+    if (result)
+        return dialog.nameValueItems();
+
+    return {};
+}
+
+} // namespace Utils