CMake: Implement cmake true/false semantics

Implement proper support for cmakes true/false value semantics.

Change-Id: I127f73f62d1b7b21b2fee032f40c9cc448b876b8
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp

@@ -148,6 +148,25 @@ CMakeConfigItem::Type CMakeConfigItem::typeStringToType(const QByteArray &type)
     return CMakeConfigItem::INTERNAL;
 }
 
+Utils::optional<bool> CMakeConfigItem::toBool(const QByteArray &value)
+{
+    // Taken from CMakes if(<constant>) documentation:
+    // "Named boolean constants are case-insensitive."
+    const QString v = QString::fromUtf8(value).toUpper();
+
+    bool isInt = false;
+    v.toInt(&isInt);
+
+    // "False if the constant is 0, OFF, NO, FALSE, N, IGNORE, NOTFOUND, the empty string, or ends in the suffix -NOTFOUND."
+    if (v == "0" || v == "OFF" || v == "NO" || v == "FALSE" || v == "N" || v == "IGNORE" || v == "NOTFOUND" || v == "" || v.endsWith("-NOTFOUND"))
+        return false;
+    // "True if the constant is 1, ON, YES, TRUE, Y, or a non-zero number."
+    if (v == "1" || v == "ON" || v == "YES" || v == "TRUE" || v == "Y" || isInt)
+        return true;
+
+    return {};
+}
+
 QString CMakeConfigItem::expandedValue(const ProjectExplorer::Kit *k) const
 {
     return expandedValue(k->macroExpander());

src/plugins/cmakeprojectmanager/cmakeconfigitem.h

@@ -25,6 +25,8 @@
 
 #pragma once
 
+#include <utils/optional.h>
+
 #include <QByteArray>
 #include <QList>
 
@@ -50,6 +52,7 @@ public:
                                    const QList<CMakeConfigItem> &input);
     static QStringList cmakeSplitValue(const QString &in, bool keepEmpty = false);
     static Type typeStringToType(const QByteArray &typeString);
+    static Utils::optional<bool> toBool(const QByteArray &value);
     bool isNull() const { return key.isEmpty(); }
 
     QString expandedValue(const ProjectExplorer::Kit *k) const;

src/plugins/cmakeprojectmanager/configmodel.cpp

@@ -36,13 +36,6 @@
 
 namespace CMakeProjectManager {
 
-static bool isTrue(const QString &value)
-{
-    const QString lower = value.toLower();
-    return lower == QStringLiteral("true") || lower == QStringLiteral("on")
-            || lower == QStringLiteral("1") || lower == QStringLiteral("yes");
-}
-
 ConfigModel::ConfigModel(QObject *parent) : Utils::TreeModel<>(parent)
 {
     setHeader({tr("Key"), tr("Value")});
@@ -431,15 +424,17 @@ QVariant ConfigModelTreeItem::data(int column, int role) const
         }
     case 1: {
         const QString value = currentValue();
+        const auto boolValue = CMakeConfigItem::toBool(value.toUtf8());
+        const bool isTrue = boolValue.has_value() && boolValue.value();
 
         switch (role) {
         case Qt::CheckStateRole:
             return (dataItem->type == ConfigModel::DataItem::BOOLEAN)
-                    ? QVariant(isTrue(value) ? Qt::Checked : Qt::Unchecked) : QVariant();
+                    ? QVariant(isTrue ? Qt::Checked : Qt::Unchecked) : QVariant();
         case Qt::DisplayRole:
             return value;
         case Qt::EditRole:
-            return (dataItem->type == ConfigModel::DataItem::BOOLEAN) ? QVariant(isTrue(value)) : QVariant(value);
+            return (dataItem->type == ConfigModel::DataItem::BOOLEAN) ? QVariant(isTrue) : QVariant(value);
         case Qt::FontRole: {
             QFont font;
             font.setBold((dataItem->isUserChanged || dataItem->isUserNew) && !dataItem->isUnset);