VariableManager: Do not try to expand Prefixes

Resolving "Prefix:<value>" does not make any sense, so let's not
do that.

Task-number: QTCREATORBUG-15072
Change-Id: Ia9741f9b48d269a7be31163ad73c3bc232856419
Reviewed-by: hjk <hjk@theqtcompany.com>

src/libs/utils/macroexpander.cpp

@@ -302,6 +302,14 @@ QString MacroExpander::expandProcessArgs(const QString &argsWithVariables) const
     return QtcProcess::expandMacros(argsWithVariables, d);
 }
 
+static QByteArray fullPrefix(const QByteArray &prefix)
+{
+    QByteArray result = prefix;
+    if (!result.endsWith(':'))
+        result.append(':');
+    return result;
+}
+
 /*!
  * Makes the given string-valued \a prefix known to the variable manager,
  * together with a localized \a description.
@@ -314,9 +322,7 @@ QString MacroExpander::expandProcessArgs(const QString &argsWithVariables) const
 void MacroExpander::registerPrefix(const QByteArray &prefix, const QString &description,
                                    const MacroExpander::PrefixFunction &value)
 {
-    QByteArray tmp = prefix;
+    QByteArray tmp = fullPrefix(prefix);
-    if (!tmp.endsWith(':'))
-        tmp.append(':');
     d->m_descriptions.insert(tmp + "<value>", description);
     d->m_prefixMap.insert(tmp, value);
 }
@@ -430,6 +436,11 @@ QString MacroExpander::variableDescription(const QByteArray &variable) const
     return d->m_descriptions.value(variable);
 }
 
+bool MacroExpander::isPrefixVariable(const QByteArray &variable) const
+{
+    return d->m_prefixMap.contains(fullPrefix(variable));
+}
+
 MacroExpanderProviders MacroExpander::subProviders() const
 {
     return d->m_subProviders;

src/libs/utils/macroexpander.h

@@ -89,6 +89,7 @@ public:
 
     QList<QByteArray> visibleVariables() const;
     QString variableDescription(const QByteArray &variable) const;
+    bool isPrefixVariable(const QByteArray &variable) const;
 
     MacroExpanderProviders subProviders() const;
 

src/plugins/coreplugin/variablechooser.cpp

@@ -177,8 +177,11 @@ public:
         }
 
         if (role == Qt::ToolTipRole) {
-            QString description = m_expander->variableDescription(m_variable.toUtf8());
+            const QByteArray var = m_variable.toUtf8();
-            const QString value = m_expander->value(m_variable.toUtf8()).toHtmlEscaped();
+            QString description = m_expander->variableDescription(var);
+            QString value;
+            if (!m_expander->isPrefixVariable(var))
+                value = m_expander->value(var).toHtmlEscaped();
             if (!value.isEmpty())
                 description += QLatin1String("<p>") + VariableChooser::tr("Current Value: %1").arg(value);
             return description;