[plasmalnf] Enrich config file

- Extend the config file format to allow theme, image pairs
   as well as just naming the themes.
 - Reduce verbosity when querying Plasma themes.

src/modules/plasmalnf/PlasmaLnfPage.cpp

@@ -26,9 +26,9 @@
 #include <KPackage/Package>
 #include <KPackage/PackageLoader>
 
-static PlasmaLnfList plasma_themes()
+static ThemeInfoList plasma_themes()
 {
-    PlasmaLnfList packages;
+    ThemeInfoList packages;
 
     QList<KPluginMetaData> pkgs = KPackage::PackageLoader::self()->listPackages( "Plasma/LookAndFeel" );
 
@@ -36,8 +36,7 @@ static PlasmaLnfList plasma_themes()
     {
         if ( data.isValid() && !data.isHidden() && !data.name().isEmpty() )
         {
-            packages << PlasmaLnfDescriptor{ data.pluginId(), data.name() };
-            cDebug() << "LNF Package" << data.pluginId();
+            packages << ThemeInfo{ data.pluginId(), data.name() };
         }
     }
 
@@ -54,7 +53,6 @@ PlasmaLnfPage::PlasmaLnfPage( QWidget* parent )
     {
         ui->retranslateUi( this );
         ui->generalExplanation->setText( tr( "Please choose a look-and-feel for the KDE Plasma Desktop, below." ) );
-        m_availableLnf = plasma_themes();
         winnowThemes();
     }
     )
@@ -65,13 +63,13 @@ PlasmaLnfPage::PlasmaLnfPage( QWidget* parent )
 void
 PlasmaLnfPage::activated( int index )
 {
-    if ( ( index < 0 ) || ( index > m_availableLnf.length() ) )
+    if ( ( index < 0 ) || ( index > m_enabledThemes.length() ) )
     {
         cDebug() << "Plasma LNF index" << index << "out of range.";
         return;
     }
 
-    const PlasmaLnfDescriptor& lnf = m_availableLnf.at( index );
+    const ThemeInfo& lnf = m_enabledThemes.at( index );
     cDebug() << "Changed to" << index << lnf.id << lnf.name;
     emit plasmaThemeSelected( lnf.id );
 }
@@ -83,16 +81,27 @@ PlasmaLnfPage::setLnfPath( const QString& path )
 }
 
 void
-PlasmaLnfPage::setEnabledThemes(const QStringList& themes)
+PlasmaLnfPage::setEnabledThemes(const ThemeInfoList& themes)
 {
-    m_enabledThemes = themes;
+    if ( themes.isEmpty() )
+        m_enabledThemes = plasma_themes();
+    else
+        m_enabledThemes = themes;
     winnowThemes();
 }
 
 void PlasmaLnfPage::winnowThemes()
 {
+    auto plasmaThemes = plasma_themes();
     ui->lnfCombo->clear();
-    for ( const auto& p : m_availableLnf )
-        if ( m_enabledThemes.isEmpty() || m_enabledThemes.contains( p.id ) )
-            ui->lnfCombo->addItem( p.name );
+    for ( auto& enabled_theme : m_enabledThemes )
+    {
+        ThemeInfo* t = plasmaThemes.findById( enabled_theme.id );
+        if ( t != nullptr )
+        {
+            enabled_theme.name = t->name;
+            ui->lnfCombo->addItem( enabled_theme.name );
+            cDebug() << "Enabled" << enabled_theme.id << "as" << enabled_theme.name;
+        }
+    }
 }

src/modules/plasmalnf/PlasmaLnfPage.h

@@ -24,19 +24,13 @@
 #include <QStringList>
 #include <QWidget>
 
+#include "ThemeInfo.h"
+
 namespace Ui
 {
 class PlasmaLnfPage;
 }
 
-struct PlasmaLnfDescriptor
-{
-    QString id;
-    QString name;
-} ;
-
-using PlasmaLnfList = QList<PlasmaLnfDescriptor>;
-
 class PlasmaLnfPage : public QWidget
 {
     Q_OBJECT
@@ -44,7 +38,7 @@ public:
     explicit PlasmaLnfPage( QWidget* parent = nullptr );
 
     void setLnfPath( const QString& path );
-    void setEnabledThemes( const QStringList& themes );
+    void setEnabledThemes( const ThemeInfoList& themes );
 
 public slots:
     void activated( int index );
@@ -57,8 +51,7 @@ private:
 
     Ui::PlasmaLnfPage* ui;
     QString m_lnfPath;
-    QStringList m_enabledThemes;
-    PlasmaLnfList m_availableLnf;
+    ThemeInfoList m_enabledThemes;
 };
 
 #endif //PLASMALNFPAGE_H

src/modules/plasmalnf/PlasmaLnfViewStep.cpp

@@ -19,6 +19,7 @@
 
 #include "PlasmaLnfJob.h"
 #include "PlasmaLnfPage.h"
+#include "ThemeInfo.h"
 
 #include "utils/Logger.h"
 
@@ -139,10 +140,20 @@ PlasmaLnfViewStep::setConfigurationMap( const QVariantMap& configurationMap )
     if ( configurationMap.contains( "themes" ) &&
         configurationMap.value( "themes" ).type() == QVariant::List )
     {
-        QStringList enabledThemes( configurationMap.value( "themes" ).toStringList() );
-        if ( enabledThemes.length() == 1 )
+        ThemeInfoList allThemes;
+        auto themeList = configurationMap.value( "themes" ).toList();
+        for ( const auto& i : themeList )
+            if ( i.type() == QVariant::Map )
+            {
+                auto iv = i.toMap();
+                allThemes.append( ThemeInfo( iv.value( "theme" ).toString(), QString(), iv.value( "image" ).toString() ) );
+            }
+            else if ( i.type() == QVariant::String )
+                allThemes.append( ThemeInfo( i.toString(), QString() ) );
+
+        if ( allThemes.length() == 1 )
             cDebug() << "WARNING: only one theme enabled in plasmalnf";
-        m_widget->setEnabledThemes( enabledThemes );
+        m_widget->setEnabledThemes( allThemes );
     }
 }
 

src/modules/plasmalnf/ThemeInfo.h

@@ -0,0 +1,75 @@
+/* === 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 PLASMALNF_THEMEINFO_H
+#define PLASMALNF_THEMEINFO_H
+
+#include <QList>
+#include <QString>
+
+class QDebug;
+
+
+struct ThemeInfo
+{
+    QString id;
+    QString name;
+    QString imagePath;
+
+    ThemeInfo()
+    {}
+
+    ThemeInfo( const QString& _id, const QString& _name, const QString& image = QString() )
+        : id( _id )
+        , name( _name )
+        , imagePath( image )
+    {}
+
+    bool isValid() const { return !id.isEmpty(); }
+} ;
+
+class ThemeInfoList : public QList< ThemeInfo >
+{
+public:
+    ThemeInfo* findById( const QString& id )
+    {
+        for ( ThemeInfo& i : *this )
+        {
+            if ( i.id == id )
+                return &i;
+        }
+        return nullptr;
+    }
+
+    const ThemeInfo* findById( const QString& id ) const
+    {
+        for ( const ThemeInfo& i : *this )
+        {
+            if ( i.id == id )
+                return &i;
+        }
+        return nullptr;
+    }
+
+    bool contains( const QString& id ) const
+    {
+        return findById( id ) != nullptr;
+    }
+} ;
+
+#endif

src/modules/plasmalnf/plasmalnf.conf

@@ -14,9 +14,13 @@ lnftool:	"/usr/bin/lookandfeeltool"
 # You can limit the list of Plasma look-and-feel themes by listing ids
 # here. If this key is not present, or the list is empty, all of the
 # installed themes are listed. If only one theme is listed, why are
-# you using this module at all?
+# you using this module at all? Themes may be listed by id,
+# (e.g. fluffy-bunny, below) or as a theme and an image (e.g. breeze)
+# which will be used to show a screenshot.
 #
 themes:
-    - org.kde.breeze.desktop
-    # - org.kde.breezedark.desktop
-
+    - theme: org.kde.breeze.desktop
+      image: "breeze.png"
+    - theme: org.kde.breezedark.desktop
+      image: "breeze-dark.png"
+    - org.kde.fluffy-bunny.desktop