Lua: Macro support

Allows users to use "%{Lua: ...}" to execute Lua code in their macros.
Adds "Macro" module with expand() and value() functions.

Change-Id: I6315b0646fbb503a77fd0cc631aed204abf3b699
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/lua/luaplugin.cpp

@@ -15,6 +15,7 @@
 
 #include <utils/algorithm.h>
 #include <utils/layoutbuilder.h>
+#include <utils/macroexpander.h>
 #include <utils/qtcprocess.h>
 #include <utils/theme/theme.h>
 
@@ -41,6 +42,7 @@ void setupHookModule();
 void setupInstallModule();
 void setupJsonModule();
 void setupLocalSocketModule();
+void setupMacroModule();
 void setupMessageManagerModule();
 void setupProcessModule();
 void setupQtModule();
@@ -49,6 +51,8 @@ void setupTextEditorModule();
 void setupTranslateModule();
 void setupUtilsModule();
 
+void setupLuaExpander(MacroExpander *expander);
+
 class LuaJsExtension : public QObject
 {
     Q_OBJECT
@@ -256,6 +260,7 @@ public:
         setupInstallModule();
         setupJsonModule();
         setupLocalSocketModule();
+        setupMacroModule();
         setupMessageManagerModule();
         setupProcessModule();
         setupQtModule();
@@ -266,6 +271,8 @@ public:
 
         Core::JsExpander::registerGlobalObject("Lua", [] { return new LuaJsExtension(); });
 
+        setupLuaExpander(globalMacroExpander());
+
         pluginSpecsFromArchiveFactories().push_back([](const FilePath &path) {
             QList<PluginSpec *> plugins;
             auto dirs = path.dirEntries(QDir::Dirs | QDir::NoDotAndDotDot);