[plasmalnf] Hammer in theme-changing

- Tool is currently a hard-coded path.

src/modules/plasmalnf/CMakeLists.txt

@@ -1,6 +1,6 @@
 find_package(ECM ${ECM_VERSION} REQUIRED NO_MODULE)
 
-find_package( KF5 5.29 REQUIRED CoreAddons Plasma Service )
+find_package( KF5 5.29 REQUIRED CoreAddons Plasma Service Package )
 
 calamares_add_plugin( plasmalnf
     TYPE viewmodule
@@ -13,6 +13,7 @@ calamares_add_plugin( plasmalnf
         page_plasmalnf.ui
     LINK_PRIVATE_LIBRARIES
         calamaresui
+        KF5::Package
         KF5::Plasma
         KF5::Service
     SHARED_LIB

src/modules/plasmalnf/PlasmaLnfInfo.cpp

@@ -29,6 +29,8 @@
 #include <KPluginLoader>  // Future
 
 #include <Plasma/PluginLoader>  // TODO: port to KPluginLoader
+#include <KPackage/Package>
+#include <KPackage/PackageLoader>
 
 #include "utils/Logger.h"
 
@@ -36,6 +38,20 @@
 namespace Calamares
 {
 
+QStringList themes_by_package()
+{
+    QStringList packages;
+
+    QList<KPluginMetaData> pkgs = KPackage::PackageLoader::self()->listPackages("Plasma/LookAndFeel");
+
+    for (const KPluginMetaData &data : pkgs) {
+        packages << data.pluginId();
+    }
+
+    return packages;
+}
+
+
 QStringList themes_by_service()
 {
     KService::List services;
@@ -88,7 +104,7 @@ QStringList themes_by_lnftool()
     QStringList packages;
 
     QProcess lnftool;
-    lnftool.start( "lookandfeeltool", {"--list"} );
+    lnftool.start( Calamares::lnftool(), {"--list"} );
     if ( lnftool.waitForStarted(1000) && lnftool.waitForFinished( 1000 ) && (lnftool.exitCode() == 0) && (lnftool.exitStatus() == QProcess::NormalExit ) )
     {
         packages = QString::fromLocal8Bit( lnftool.readAllStandardOutput() ).trimmed().split('\n');
@@ -96,4 +112,17 @@ QStringList themes_by_lnftool()
     return packages;
 }
 
+QStringList plasma_themes()
+{
+    QStringList l( themes_by_package() );
+    if (l.isEmpty())
+        return themes_by_lnftool();
+    return l;
+}
+
+QString lnftool()
+{
+    return "/home/adridg/bin/lookandfeeltool";
+}
+
 }  // namespace Calamares

src/modules/plasmalnf/PlasmaLnfInfo.h

@@ -23,11 +23,15 @@
 
 namespace Calamares
 {
+QString lnftool();
 
+    /* Internal */
+QStringList themes_by_package();
 QStringList themes_by_service();
 QStringList themes_by_kcm();
 QStringList themes_by_lnftool();
 
+QStringList plasma_themes();
 }
 
 #endif // PLASMALNFINFO_H

src/modules/plasmalnf/PlasmaLnfPage.cpp

@@ -32,6 +32,7 @@
 #include <QButtonGroup>
 #include <QDesktopServices>
 #include <QLabel>
+#include <QProcess>
 
 PlasmaLnfPage::PlasmaLnfPage(QWidget *parent)
     : QWidget( parent )
@@ -45,7 +46,22 @@ PlasmaLnfPage::PlasmaLnfPage(QWidget *parent)
         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() );
+    Calamares::themes_by_package();
+    ui->lnfCombo->addItems( Calamares::plasma_themes() );
+
+    QObject::connect<void(QComboBox::*)(const QString&)>(ui->lnfCombo, &QComboBox::activated, this, &PlasmaLnfPage::activated);
 }
 
+void
+PlasmaLnfPage::activated(const QString& name)
+{
+    cDebug() << "Changed to" << name;
+
+    QProcess lnftool;
+    lnftool.start( Calamares::lnftool(), {"--apply", name} );
+
+    if ( lnftool.waitForStarted(1000) && lnftool.waitForFinished( 1000 ) && (lnftool.exitCode() == 0) && (lnftool.exitStatus() == QProcess::NormalExit ) )
+        ; // OK
+    else
+        cDebug() << "WARNING: could not apply look-and-feel" << name;
+}

src/modules/plasmalnf/PlasmaLnfPage.h

@@ -33,6 +33,9 @@ class PlasmaLnfPage : public QWidget
 public:
     explicit PlasmaLnfPage( QWidget* parent = nullptr );
 
+public slots:
+    void activated(const QString& name);
+
 private:
     Ui::PlasmaLnfPage* ui;
 };