[plasmalnf] Get available LNF

- Implement various ways of getting the LNF; the process-based one
   uses a recent CLI-tool from the Plasma developers.
 - Fill the UI with (meaningless) LNF package IDs.

src/modules/plasmalnf/CMakeLists.txt

@@ -8,9 +8,12 @@ calamares_add_plugin( plasmalnf
     SOURCES
         PlasmaLnfViewStep.cpp
         PlasmaLnfPage.cpp
+        PlasmaLnfInfo.cpp
     UI
         page_plasmalnf.ui
     LINK_PRIVATE_LIBRARIES
         calamaresui
+        KF5::Plasma
+        KF5::Service
     SHARED_LIB
 )

src/modules/plasmalnf/PlasmaLnfInfo.cpp

@@ -0,0 +1,99 @@
+/* === This file is part of Calamares - <http://github.com/calamares> ===
+ *
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "PlasmaLnfInfo.h"
+
+#include <QDateTime>
+#include <QDir>
+#include <QProcess>
+#include <QStandardPaths>
+#include <QThread>
+
+#include <KService>
+#include <KServiceTypeTrader>
+#include <KPluginLoader>  // Future
+
+#include <Plasma/PluginLoader>  // TODO: port to KPluginLoader
+
+#include "utils/Logger.h"
+
+
+namespace Calamares
+{
+
+QStringList themes_by_service()
+{
+    KService::List services;
+    KServiceTypeTrader* trader = KServiceTypeTrader::self();
+
+    cDebug() << "Plasma themes by service:";
+    QStringList packages;
+    services = trader->query("Plasma/Theme");
+    int c = 0;
+    for ( const auto s : services )
+    {
+        cDebug() << "  .. Plasma theme" << s->name();
+        packages << s->name();
+        c++;
+    }
+
+    return packages;
+}
+
+QStringList themes_by_kcm()
+{
+    QString component;
+    QList<Plasma::Package> packages;
+    QStringList paths;
+    QStringList packageNames;
+    const QStringList dataPaths = QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation);
+
+    for (const QString &path : dataPaths) {
+        QDir dir(path + "/plasma/look-and-feel");
+        paths << dir.entryList(QDir::AllDirs | QDir::NoDotAndDotDot);
+    }
+
+    cDebug() << "Plasma themes by kcm:";
+    for (const QString &path : paths) {
+        Plasma::Package pkg = Plasma::PluginLoader::self()->loadPackage(QStringLiteral("Plasma/LookAndFeel"));
+        pkg.setPath(path);
+        pkg.setFallbackPackage(Plasma::Package());
+        if (component.isEmpty() || !pkg.filePath(component.toUtf8()).isEmpty()) {
+            packages << pkg;
+            packageNames << pkg.metadata().pluginName();
+            cDebug() << "  .. Plasma theme" << pkg.metadata().pluginName();
+        }
+    }
+
+    return packageNames;
+}
+
+QStringList themes_by_lnftool()
+{
+    QStringList packages;
+
+    QProcess lnftool;
+    lnftool.start( "lookandfeeltool", {"--list"} );
+    if ( lnftool.waitForStarted(1000) && lnftool.waitForFinished( 1000 ) && (lnftool.exitCode() == 0) && (lnftool.exitStatus() == QProcess::NormalExit ) )
+    {
+        packages = QString::fromLocal8Bit( lnftool.readAllStandardOutput() ).trimmed().split('\n');
+    }
+    return packages;
+}
+
+}  // namespace Calamares

src/modules/plasmalnf/PlasmaLnfInfo.h

@@ -0,0 +1,33 @@
+/* === This file is part of Calamares - <http://github.com/calamares> ===
+ *
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef PLASMALNFINFO_H
+#define PLASMALNFINFO_H
+
+#include <QStringList>
+
+namespace Calamares
+{
+
+QStringList themes_by_service();
+QStringList themes_by_kcm();
+QStringList themes_by_lnftool();
+
+}
+
+#endif // PLASMALNFINFO_H

src/modules/plasmalnf/PlasmaLnfPage.cpp

@@ -17,6 +17,7 @@
  */
 
 #include "PlasmaLnfPage.h"
+#include "PlasmaLnfInfo.h"
 
 #include "ui_page_plasmalnf.h"
 
@@ -43,5 +44,8 @@ PlasmaLnfPage::PlasmaLnfPage(QWidget *parent)
         ui->retranslateUi( this );
         ui->generalExplanation->setText( tr( "Please choose a look-and-feel for the KDE Plasma Desktop, below." ) );
     )
+
+    Calamares::themes_by_service();
+    ui->lnfCombo->addItems( Calamares::themes_by_lnftool() );
 }
 

src/modules/plasmalnf/page_plasmalnf.ui

@@ -13,7 +13,7 @@
   <property name="windowTitle">
    <string>Form</string>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout" stretch="0,0">
+  <layout class="QVBoxLayout" name="verticalLayout" stretch="0,0,0">
    <item>
     <widget class="QLabel" name="generalExplanation">
      <property name="styleSheet">
@@ -28,6 +28,9 @@ margin-left: 2em;</string>
      </property>
     </widget>
    </item>
+   <item>
+    <widget class="QComboBox" name="lnfCombo"/>
+   </item>
    <item>
     <spacer name="verticalSpacer">
      <property name="orientation">