allow for lnf packages to override templates

Summary:
allow for lnf package to override templates, so that
for instance, "default panel" can be overriden, so in a
distribution adding a "default panel" would add what is the
"default panel" of that distribution.
switching lnf package would get back a normal panel

Reviewers: garg, ivan, #plasma

Reviewed By: ivan, #plasma

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D2298

shell/scripting/scriptengine.cpp

@@ -497,13 +497,29 @@ QScriptValue ScriptEngine::loadTemplate(QScriptContext *context, QScriptEngine *
     KPackage::Package package = KPackage::PackageLoader::self()->loadPackage(QStringLiteral("Plasma/LayoutTemplate"));
     KPluginInfo info(offers.first());
 
-    const QString path = QStandardPaths::locate(QStandardPaths::GenericDataLocation, package.defaultPackageRoot() + info.pluginName() + "/metadata.desktop");
-    if (path.isEmpty()) {
-        // qDebug() << "script path is empty";
-        return false;
+    QString path;
+    {
+        ScriptEngine *env = envFor(engine);
+        ShellCorona *sc = qobject_cast<ShellCorona *>(env->m_corona);
+        if (sc) {
+            const QString overridePackagePath = sc->lookAndFeelPackage().path() + QStringLiteral("contents/layouts/") + info.pluginName();
+
+            path = overridePackagePath + QStringLiteral("/metadata.desktop");
+            if (QFile::exists(path)) {
+                package.setPath(overridePackagePath);
+            }
+        }
     }
 
-    package.setPath(info.pluginName());
+    if (!package.isValid()) {
+        path = QStandardPaths::locate(QStandardPaths::GenericDataLocation, package.defaultPackageRoot() + info.pluginName() + "/metadata.desktop");
+        if (path.isEmpty()) {
+            // qDebug() << "script path is empty";
+            return false;
+        }
+
+        package.setPath(info.pluginName());
+    }
 
     const QString scriptFile = package.filePath("mainscript");
     if (scriptFile.isEmpty()) {

shell/shellcorona.cpp

@@ -1348,16 +1348,12 @@ void ShellCorona::populateAddPanelsMenu()
 
             action->setData(plugin.pluginName());
         } else {
-            //FIXME: proper names
             KPluginInfo info(pair.second);
-            const QString path = QStandardPaths::locate(QStandardPaths::GenericDataLocation, package.defaultPackageRoot() + info.pluginName() + "/metadata.desktop");
-            if (!path.isEmpty()) {
-                package.setPath(info.pluginName());
-                const QString scriptFile = package.filePath("mainscript");
-                if (!scriptFile.isEmpty()) {
-                    QAction *action = m_addPanelsMenu->addAction(info.name());
-                    action->setData(QStringLiteral("plasma-desktop-template:%1").arg(scriptFile));
-                }
+            package.setPath(info.pluginName());
+            const QString scriptFile = package.filePath("mainscript");
+            if (!scriptFile.isEmpty()) {
+                QAction *action = m_addPanelsMenu->addAction(info.name());
+                action->setData(QStringLiteral("plasma-desktop-template:%1").arg(info.pluginName()));
             }
         }
     }
@@ -1386,20 +1382,9 @@ void ShellCorona::addPanel(QAction *action)
                 [](const QString &msg) {
                     qDebug() << msg;
                 });
-        const QString scriptFile = plugin.right(plugin.length() - qstrlen("plasma-desktop-template:"));
-        QFile file(scriptFile);
-        if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
-            qWarning() << i18n("Unable to load script file: %1", scriptFile);
-            return;
-        }
-
-        QString script = file.readAll();
-        if (script.isEmpty()) {
-            // qDebug() << "script is empty";
-            return;
-        }
+        const QString templateName = plugin.right(plugin.length() - qstrlen("plasma-desktop-template:"));
 
-        scriptEngine.evaluateScript(script, scriptFile);
+        scriptEngine.evaluateScript(QStringLiteral("loadTemplate(\"%1\")").arg(templateName));
     } else if (!plugin.isEmpty()) {
         addPanel(plugin);
     }