Add support for various output formats for QMakeProperty

Add the ability to select a standard and json output formats of
the Qt properties. This patch also improves the encapsulation of
QMakeProperty.

Change-Id: Ib1d232be1b430ed8456ce65cc98141282e4c3f7f
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

6 files changed, 213 insertions, 67 deletions

diff --git a/qmake/CMakeLists.txt b/qmake/CMakeLists.txt
index 0a49c9db79..b89cf25f10 100644
--- a/qmake/CMakeLists.txt
+++ b/qmake/CMakeLists.txt
@@ -9,6 +9,7 @@ add_library(QtLibraryInfo OBJECT
     library/proitems.cpp library/proitems.h
     library/qmake_global.h
     property.cpp property.h
+    propertyprinter.cpp propertyprinter.h
     qmakelibraryinfo.cpp qmakelibraryinfo.h
 )
 set_target_properties(QtLibraryInfo PROPERTIES
diff --git a/qmake/main.cpp b/qmake/main.cpp
index 3180d5c826..b00d110827 100644
--- a/qmake/main.cpp
+++ b/qmake/main.cpp
@@ -508,10 +508,18 @@ int runQMake(int argc, char **argv)
     }
 
     QMakeProperty prop;
-    if(Option::qmake_mode == Option::QMAKE_QUERY_PROPERTY ||
-       Option::qmake_mode == Option::QMAKE_SET_PROPERTY ||
-       Option::qmake_mode == Option::QMAKE_UNSET_PROPERTY)
-        return prop.exec() ? 0 : 101;
+    switch (Option::qmake_mode) {
+    case Option::QMAKE_QUERY_PROPERTY:
+        return prop.queryProperty(Option::prop::properties);
+    case Option::QMAKE_SET_PROPERTY:
+        return prop.setProperty(Option::prop::properties);
+    case Option::QMAKE_UNSET_PROPERTY:
+        prop.unsetProperty(Option::prop::properties);
+        return 0;
+    default:
+        break;
+    }
+
     globals.setQMakeProperty(&prop);
 
     ProFileCache proFileCache;
diff --git a/qmake/property.cpp b/qmake/property.cpp
index 0ef9813eee..2a1c4170b9 100644
--- a/qmake/property.cpp
+++ b/qmake/property.cpp
@@ -27,7 +27,6 @@
 ****************************************************************************/
 
 #include "property.h"
-#include "option.h"
 
 #include <qdir.h>
 #include <qsettings.h>
@@ -35,6 +34,11 @@
 #include <qstringlist.h>
 #include <stdio.h>
 
+namespace {
+constexpr int PropSuccessRetCode = 0;
+constexpr int PropFailRetCode = 101;
+}
+
 QT_BEGIN_NAMESPACE
 
 static const struct {
@@ -146,76 +150,79 @@ QMakeProperty::remove(const QString &var)
     settings->remove(var);
 }
 
-bool
-QMakeProperty::exec()
+int QMakeProperty::queryProperty(const QStringList &optionProperties,
+                                 const PropertyPrinter &printer)
 {
-    bool ret = true;
-    if (Option::qmake_mode == Option::QMAKE_QUERY_PROPERTY) {
-        if (Option::prop::properties.isEmpty()) {
-            initSettings();
-            const auto keys = settings->childKeys();
-            for (const QString &key : keys) {
-                QString val = settings->value(key).toString();
-                fprintf(stdout, "%s:%s\n", qPrintable(key), qPrintable(val));
-            }
-            QStringList specialProps;
-            for (unsigned i = 0; i < sizeof(propList)/sizeof(propList[0]); i++)
-                specialProps.append(QString::fromLatin1(propList[i].name));
-            specialProps.append("QMAKE_VERSION");
+    QList<QPair<QString, QString>> output;
+    int ret = PropSuccessRetCode;
+    if (optionProperties.isEmpty()) {
+        initSettings();
+        const auto keys = settings->childKeys();
+        for (const QString &key : keys) {
+            QString val = settings->value(key).toString();
+            output.append({ key, val });
+        }
+        QStringList specialProps;
+        for (unsigned i = 0; i < sizeof(propList) / sizeof(propList[0]); i++)
+            specialProps.append(QString::fromLatin1(propList[i].name));
+#ifdef QMAKE_VERSION_STR
+        specialProps.append("QMAKE_VERSION");
+#endif
 #ifdef QT_VERSION_STR
-            specialProps.append("QT_VERSION");
+        specialProps.append("QT_VERSION");
 #endif
-            for (const QString &prop : qAsConst(specialProps)) {
-                ProString val = value(ProKey(prop));
-                ProString pval = value(ProKey(prop + "/raw"));
-                ProString gval = value(ProKey(prop + "/get"));
-                ProString sval = value(ProKey(prop + "/src"));
-                ProString dval = value(ProKey(prop + "/dev"));
-                fprintf(stdout, "%s:%s\n", prop.toLatin1().constData(), val.toLatin1().constData());
-                if (!pval.isEmpty() && pval != val)
-                    fprintf(stdout, "%s/raw:%s\n", prop.toLatin1().constData(), pval.toLatin1().constData());
-                if (!gval.isEmpty() && gval != (pval.isEmpty() ? val : pval))
-                    fprintf(stdout, "%s/get:%s\n", prop.toLatin1().constData(), gval.toLatin1().constData());
-                if (!sval.isEmpty() && sval != gval)
-                    fprintf(stdout, "%s/src:%s\n", prop.toLatin1().constData(), sval.toLatin1().constData());
-                if (!dval.isEmpty() && dval != pval)
-                    fprintf(stdout, "%s/dev:%s\n", prop.toLatin1().constData(), dval.toLatin1().constData());
-            }
-            return true;
+        for (const QString &prop : qAsConst(specialProps)) {
+            ProString val = value(ProKey(prop));
+            ProString pval = value(ProKey(prop + "/raw"));
+            ProString gval = value(ProKey(prop + "/get"));
+            ProString sval = value(ProKey(prop + "/src"));
+            ProString dval = value(ProKey(prop + "/dev"));
+            output.append({ prop, val.toQString() });
+            if (!pval.isEmpty() && pval != val)
+                output.append({ prop + "/raw", pval.toQString() });
+            if (!gval.isEmpty() && gval != (pval.isEmpty() ? val : pval))
+                output.append({ prop + "/get", gval.toQString() });
+            if (!sval.isEmpty() && sval != gval)
+                output.append({ prop + "/src", sval.toQString() });
+            if (!dval.isEmpty() && dval != pval)
+                output.append({ prop + "/dev", dval.toQString() });
         }
-        for (QStringList::ConstIterator it = Option::prop::properties.cbegin();
-            it != Option::prop::properties.cend(); it++) {
-            if (Option::prop::properties.count() > 1)
-                fprintf(stdout, "%s:", (*it).toLatin1().constData());
-            const ProKey pkey(*it);
+    } else {
+        for (const auto &prop : optionProperties) {
+            const ProKey pkey(prop);
             if (!hasValue(pkey)) {
-                ret = false;
-                fprintf(stdout, "**Unknown**\n");
+                ret = PropFailRetCode;
+                output.append({ prop, QString("**Unknown**") });
             } else {
-                fprintf(stdout, "%s\n", value(pkey).toLatin1().constData());
-            }
-        }
-    } else if(Option::qmake_mode == Option::QMAKE_SET_PROPERTY) {
-        for (QStringList::ConstIterator it = Option::prop::properties.cbegin();
-            it != Option::prop::properties.cend(); it++) {
-            QString var = (*it);
-            it++;
-            if (it == Option::prop::properties.cend()) {
-                ret = false;
-                break;
+                output.append({ prop, value(pkey).toQString() });
             }
-            if(!var.startsWith("."))
-                setValue(var, (*it));
-        }
-    } else if(Option::qmake_mode == Option::QMAKE_UNSET_PROPERTY) {
-        for (QStringList::ConstIterator it = Option::prop::properties.cbegin();
-            it != Option::prop::properties.cend(); it++) {
-            QString var = (*it);
-            if(!var.startsWith("."))
-                remove(var);
         }
     }
+    printer(output);
     return ret;
 }
 
+int QMakeProperty::setProperty(const QStringList &optionProperties)
+{
+    for (auto it = optionProperties.cbegin(); it != optionProperties.cend(); ++it) {
+        QString var = (*it);
+        ++it;
+        if (it == optionProperties.cend()) {
+            return PropFailRetCode;
+        }
+        if (!var.startsWith("."))
+            setValue(var, (*it));
+    }
+    return PropSuccessRetCode;
+}
+
+void QMakeProperty::unsetProperty(const QStringList &optionProperties)
+{
+    for (auto it = optionProperties.cbegin(); it != optionProperties.cend(); ++it) {
+        QString var = (*it);
+        if (!var.startsWith("."))
+            remove(var);
+    }
+}
+
 QT_END_NAMESPACE
diff --git a/qmake/property.h b/qmake/property.h
index b0129196eb..7b41a7ad83 100644
--- a/qmake/property.h
+++ b/qmake/property.h
@@ -30,6 +30,7 @@
 #define PROPERTY_H
 
 #include "library/proitems.h"
+#include "propertyprinter.h"
 
 #include <qglobal.h>
 #include <qstring.h>
@@ -39,7 +40,7 @@ QT_BEGIN_NAMESPACE
 
 class QSettings;
 
-class QMakeProperty
+class QMakeProperty final
 {
     QSettings *settings;
     void initSettings();
@@ -58,7 +59,10 @@ public:
     void setValue(QString, const QString &);
     void remove(const QString &);
 
-    bool exec();
+    int queryProperty(const QStringList &optionProperties = QStringList(),
+                      const PropertyPrinter &printer = qmakePropertyPrinter);
+    int setProperty(const QStringList &optionProperties);
+    void unsetProperty(const QStringList &optionProperties);
 };
 
 QT_END_NAMESPACE
diff --git a/qmake/propertyprinter.cpp b/qmake/propertyprinter.cpp
new file mode 100644
index 0000000000..d59e99f824
--- /dev/null
+++ b/qmake/propertyprinter.cpp
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** 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-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "propertyprinter.h"
+
+#include <iostream>
+
+QT_BEGIN_NAMESPACE
+
+void qmakePropertyPrinter(const QList<QPair<QString, QString>> &values)
+{
+    // Assume single property request
+    if (values.count() == 1) {
+        std::cout << qPrintable(values.at(0).second) << std::endl;
+        return;
+    }
+
+    for (const auto &val : values) {
+        std::cout << qPrintable(val.first) << ":" << qPrintable(val.second) << std::endl;
+    }
+}
+
+void jsonPropertyPrinter(const QList<QPair<QString, QString>> &values)
+{
+    std::cout << "{\n";
+    for (const auto &val : values) {
+        std::cout << "\"" << qPrintable(val.first) << "\":\"" << qPrintable(val.second) << "\",\n";
+    }
+    std::cout << "}\n";
+}
+
+QT_END_NAMESPACE
diff --git a/qmake/propertyprinter.h b/qmake/propertyprinter.h
new file mode 100644
index 0000000000..c885d5b055
--- /dev/null
+++ b/qmake/propertyprinter.h
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** 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-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef PROPERTYPRINTER_H
+#define PROPERTYPRINTER_H
+
+#include <qglobal.h>
+#include <qlist.h>
+#include <qpair.h>
+#include <qstring.h>
+
+#include <functional>
+
+QT_BEGIN_NAMESPACE
+
+using PropertyPrinter = std::function<void(const QList<QPair<QString, QString>> &)>;
+void qmakePropertyPrinter(const QList<QPair<QString, QString>> &values);
+void jsonPropertyPrinter(const QList<QPair<QString, QString>> &values);
+
+QT_END_NAMESPACE
+
+#endif // PROPERTYPRINTER_H