Clang: Rename directory ipcsource to source

Now it's in accordance with clangrefactoringbackend/source and
clangpchmanagerbackend/source.

Change-Id: I939cfc72cffb8fcde0649f125e6efb6670d1cbc3
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/tools/clangbackend/source/clangfilesystemwatcher.cpp

@@ -0,0 +1,91 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 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 "clangfilesystemwatcher.h"
+
+#include "clangdocuments.h"
+
+#include <utf8stringvector.h>
+
+#include <QFileInfo>
+#include <QStringList>
+
+#include <algorithm>
+#include <iterator>
+
+namespace ClangBackEnd {
+
+namespace {
+QStringList toStringList(const QSet<Utf8String> &files)
+{
+    QStringList resultList;
+    resultList.reserve(files.size());
+
+    std::copy(files.cbegin(), files.cend(), std::back_inserter(resultList));
+
+    return resultList;
+}
+
+QStringList filterExistingFiles(QStringList &&filePaths)
+{
+    auto fileExists = [] (const QString &filePath) {
+        return QFileInfo::exists(filePath);
+    };
+
+    auto startOfNonExistingFilePaths = std::partition(filePaths.begin(),
+                                                      filePaths.end(),
+                                                      fileExists);
+
+    filePaths.erase(startOfNonExistingFilePaths, filePaths.end());
+
+    return filePaths;
+}
+}
+
+ClangFileSystemWatcher::ClangFileSystemWatcher(Documents &documents)
+    : documents(documents)
+{
+    connect(&watcher,
+            &QFileSystemWatcher::fileChanged,
+            this,
+            &ClangFileSystemWatcher::updateDocumentsWithChangedDependencies);
+}
+
+void ClangFileSystemWatcher::addFiles(const QSet<Utf8String> &filePaths)
+{
+    const auto existingFiles = filterExistingFiles(toStringList(filePaths));
+
+    if (!existingFiles.isEmpty())
+        watcher.addPaths(existingFiles);
+}
+
+void ClangFileSystemWatcher::updateDocumentsWithChangedDependencies(const QString &filePath)
+{
+    documents.updateDocumentsWithChangedDependency(filePath);
+
+    emit fileChanged(filePath);
+}
+
+} // namespace ClangBackEnd