make PackageStructure loading actually work and abstract that all away into a cute little method elsewhere

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=793416

applet.cpp

@@ -164,15 +164,9 @@ public:
             } else {
                 // create the package and see if we have something real
                 //kDebug() << "trying for" << path;
-                QString packageFormat = appletDescription.property("X-Plasma-PackageFormat").toString();
-
-                if (packageFormat.isEmpty()) {
-                    package = new Package(path, PackageStructure::Ptr(new PlasmoidPackage()));
-                } else {
-                    PackageStructure::Ptr structure = PackageStructure::load(packageFormat);
-                    structure->setPath(path);
-                    package = new Package(path, structure);
-                }
+                PackageStructure::Ptr structure = Plasma::packageStructure(language, Plasma::AppletComponent);
+                structure->setPath(path);
+                package = new Package(path, structure);
 
                 if (package->isValid()) {
                     // now we try and set up the script engine.

scripting/scriptengine.cpp

@@ -27,6 +27,7 @@
 #include "applet.h"
 #include "dataengine.h"
 #include "package.h"
+#include "packages_p.h"
 #include "scripting/appletscript.h"
 #include "scripting/dataenginescript.h"
 #include "scripting/runnerscript.h"
@@ -96,16 +97,16 @@ QStringList knownLanguages(ComponentTypes types)
     return languages;
 }
 
-ScriptEngine* loadEngine(const QString &language, ComponentType type, QObject *parent)
+KService::List engineOffers(const QString &language, ComponentType type)
 {
     if (language.isEmpty()) {
-        return 0;
+        return KService::List();
     }
 
     QRegExp re("[^a-zA-Z0-9\\-_]");
     if (re.indexIn(language) != -1) {
         kDebug() << "invalid language attempted:" << language;
-        return 0;
+        return KService::List();
     }
 
     QString component;
@@ -120,7 +121,7 @@ ScriptEngine* loadEngine(const QString &language, ComponentType type, QObject *p
             component = "Runner";
             break;
         default:
-            return 0;
+            return KService::List();
             break;
     }
 
@@ -131,9 +132,15 @@ ScriptEngine* loadEngine(const QString &language, ComponentType type, QObject *p
              << "resulting in" << offers.count() << "results";*/
     if (offers.isEmpty()) {
         kDebug() << "ScriptEngine::load: no offers for \"" << language << "\"";
-        return 0;
     }
 
+    return offers;
+}
+
+ScriptEngine* loadEngine(const QString &language, ComponentType type, QObject *parent)
+{
+    KService::List offers = engineOffers(language, type);
+
     QVariantList args;
     QString error;
 
@@ -197,6 +204,39 @@ RunnerScript* loadScriptEngine(const QString &language, AbstractRunner *runner)
     return engine;
 }
 
+PackageStructure::Ptr defaultPackageStructure(ComponentType type)
+{
+    switch (type) {
+        case AppletComponent:
+            return PackageStructure::Ptr(new PlasmoidPackage());
+            break;
+        default:
+            // TODO: we don't have any special structures for other components yet
+            break;
+    }
+
+    return PackageStructure::Ptr(new PackageStructure());
+}
+
+PackageStructure::Ptr packageStructure(const QString &language, ComponentType type)
+{
+    KService::List offers = engineOffers(language, type);
+
+    if (offers.isEmpty()) {
+        return defaultPackageStructure(type);
+    }
+
+    KService::Ptr offer = offers.first();
+    QString packageFormat = offer->property("X-Plasma-PackageFormat").toString();
+
+    if (packageFormat.isEmpty()) {
+        return defaultPackageStructure(type);
+    } else {
+        PackageStructure::Ptr structure = PackageStructure::load(packageFormat);
+        return structure;
+    }
+}
+
 } // namespace Plasma
 
 #include <scriptengine.moc>

scripting/scriptengine.h

@@ -21,6 +21,7 @@
 #define PLASMA_SCRIPTENGINE_H
 
 #include <plasma/plasma_export.h>
+#include <plasma/packagestructure.h>
 #include <plasma/plasma.h>
 
 #include <QtCore/QObject>
@@ -111,6 +112,15 @@ DataEngineScript* loadScriptEngine(const QString &language, DataEngine *dataEngi
  **/
 RunnerScript* loadScriptEngine(const QString &language, AbstractRunner *runner);
 
+/**
+ * Loads an appropriate PackageStructure for the given language and type
+ *
+ * @param langauge the language to load the PackageStructure for
+ * @param type the component type
+ * @return a guarded PackageStructure pointer
+ */
+PackageStructure::Ptr packageStructure(const QString &language, ComponentType type);
+
 } // namespace Plasma
 
 #endif