CommandLine: Add a c'tor accepting a list of various types

Make it possible to pass a list of a mixture of QStrings
and QStringLists for command line's "args" argument.

Change-Id: Iafe3249f074b9568537e72a80e46ec4ed143014a
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/commandline.cpp

@@ -1425,6 +1425,19 @@ CommandLine::CommandLine(const FilePath &exe, const QStringList &args)
     addArgs(args);
 }
 
+CommandLine::CommandLine(const FilePath &exe, std::initializer_list<ArgRef> args)
+    : m_executable(exe)
+{
+    for (const ArgRef &arg : args) {
+        if (const auto ptr = std::get_if<const char *>(&arg.m_arg))
+            addArg(QString::fromUtf8(*ptr));
+        else if (const auto ptr = std::get_if<std::reference_wrapper<const QString>>(&arg.m_arg))
+            addArg(*ptr);
+        else if (const auto ptr = std::get_if<std::reference_wrapper<const QStringList>>(&arg.m_arg))
+            addArgs(*ptr);
+    }
+}
+
 CommandLine::CommandLine(const FilePath &exe, const QStringList &args, OsType osType)
     : m_executable(exe)
 {

src/libs/utils/commandline.h

@@ -11,6 +11,8 @@
 #include <QPair>
 #include <QStringList>
 
+#include <variant>
+
 namespace Utils {
 
 class AbstractMacroExpander;
@@ -120,8 +122,22 @@ public:
     CommandLine();
     ~CommandLine();
 
+    struct ArgRef
+    {
+        ArgRef(const char *arg) : m_arg(arg) {}
+        ArgRef(const QString &arg) : m_arg(arg) {}
+        ArgRef(const QStringList &args) : m_arg(args) {}
+
+    private:
+        friend class CommandLine;
+        const std::variant<const char *,
+                           std::reference_wrapper<const QString>,
+                           std::reference_wrapper<const QStringList>> m_arg;
+    };
+
     explicit CommandLine(const FilePath &executable);
     CommandLine(const FilePath &exe, const QStringList &args);
+    CommandLine(const FilePath &exe, std::initializer_list<ArgRef> args);
     CommandLine(const FilePath &exe, const QStringList &args, OsType osType);
     CommandLine(const FilePath &exe, const QString &unparsedArgs, RawType);