ClangTools: Query the tools for supported checks

...instead of hardcoding them for a particular version of
clang-tidy/clazy.

While at it, move also the tidy/clazy widgets to ClangTools as this
simplifies feeding data to them.

Reduce also the built-in configs to a single one using clang-tidy's and
clazy's default checks as they look very reasonable and saves us some
porting effort. Also, our previous built-in configs were just too
numerous.

Change-Id: Ib9297acb7810a940b86a23a8695530506a570394
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/clangtools/executableinfo.cpp

@@ -0,0 +1,161 @@
+/****************************************************************************
+**
+** 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 "executableinfo.h"
+
+#include <coreplugin/icore.h>
+#include <coreplugin/messagemanager.h>
+
+#include <utils/environment.h>
+#include <utils/synchronousprocess.h>
+
+#include <QFileInfo>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QTextStream>
+
+using namespace Utils;
+
+namespace ClangTools {
+namespace Internal {
+
+static QString runExecutable(const Utils::CommandLine &commandLine)
+{
+    if (commandLine.executable().isEmpty() || !commandLine.executable().toFileInfo().isExecutable())
+        return {};
+
+    SynchronousProcess cpp;
+    Utils::Environment env = Environment::systemEnvironment();
+    Environment::setupEnglishOutput(&env);
+    cpp.setEnvironment(env.toStringList());
+
+    SynchronousProcessResponse response =  cpp.runBlocking(commandLine);
+    if (response.result != SynchronousProcessResponse::Finished || response.exitCode != 0) {
+        Core::MessageManager::write(response.exitMessage(commandLine.toUserOutput(), 10));
+        Core::MessageManager::write(QString::fromUtf8(response.allRawOutput()));
+        return {};
+    }
+
+    return response.allOutput();
+}
+
+static QStringList queryClangTidyChecks(const QString &executable,
+                                        const QString &checksArgument)
+{
+    QStringList arguments = QStringList("-list-checks");
+    if (!checksArgument.isEmpty())
+        arguments.prepend(checksArgument);
+
+    const CommandLine commandLine(executable, arguments);
+    QString output = runExecutable(commandLine);
+    if (output.isEmpty())
+        return {};
+
+    // Expected output is (clang-tidy 8.0):
+    //   Enabled checks:
+    //       abseil-duration-comparison
+    //       abseil-duration-division
+    //       abseil-duration-factory-float
+    //       ...
+
+    QTextStream stream(&output);
+    QString line = stream.readLine();
+    if (!line.startsWith("Enabled checks:"))
+        return {};
+
+    QStringList checks;
+    while (!stream.atEnd()) {
+        const QString candidate = stream.readLine().trimmed();
+        if (!candidate.isEmpty())
+            checks << candidate;
+    }
+
+    return checks;
+}
+
+static ClazyChecks querySupportedClazyChecks(const QString &executablePath)
+{
+    const CommandLine commandLine(executablePath, {"-supported-checks-json"});
+    const QString jsonOutput = runExecutable(commandLine);
+    if (jsonOutput.isEmpty())
+        return {};
+
+    // Expected output is (clazy-standalone 1.6):
+    //   {
+    //       "available_categories" : ["readability", "qt4", "containers", ... ],
+    //       "checks" : [
+    //           {
+    //               "name"  : "qt-keywords",
+    //               "level" : -1,
+    //               "fixits" : [ { "name" : "qt-keywords" } ]
+    //           },
+    //           ...
+    //           {
+    //               "name"  : "inefficient-qlist",
+    //               "level" : -1,
+    //               "categories" : ["containers", "performance"],
+    //               "visits_decls" : true
+    //           },
+    //           ...
+    //       ]
+    //   }
+
+    ClazyChecks infos;
+
+    const QJsonDocument document = QJsonDocument::fromJson(jsonOutput.toUtf8());
+    if (document.isNull())
+        return {};
+    const QJsonArray checksArray = document.object()["checks"].toArray();
+
+    for (const QJsonValue &item: checksArray) {
+        const QJsonObject checkObject = item.toObject();
+
+        ClazyCheck info;
+        info.name = checkObject["name"].toString().trimmed();
+        if (info.name.isEmpty())
+            continue;
+        info.level = checkObject["level"].toInt();
+        for (const QJsonValue &item : checkObject["categories"].toArray())
+            info.topics.append(item.toString().trimmed());
+
+        infos << info;
+    }
+
+    return infos;
+}
+
+ClangTidyInfo::ClangTidyInfo(const QString &executablePath)
+    : defaultChecks(queryClangTidyChecks(executablePath, {}))
+    , supportedChecks(queryClangTidyChecks(executablePath, "-checks=*"))
+{}
+
+ClazyStandaloneInfo::ClazyStandaloneInfo(const QString &executablePath)
+    : defaultChecks(queryClangTidyChecks(executablePath, {})) // Yup, behaves as clang-tidy.
+    , supportedChecks(querySupportedClazyChecks(executablePath))
+{}
+
+} // namespace Internal
+} // namespace ClangTools