[kcms/baloo] Offer to delete index after indexing is disabled

When the user disables indexing, the KCM now offers to remove the saved
index data. This may be useful for privacy or security purposes.

BUG: 414077
FIXED-IN:5.22

kcms/baloo/kcm.cpp

@@ -22,6 +22,7 @@
 #include "fileexcludefilters.h"
 
 #include <KAboutData>
+#include <KFormat>
 #include <KLocalizedString>
 #include <KPluginFactory>
 #include <QStandardPaths>
@@ -39,6 +40,17 @@
 
 K_PLUGIN_FACTORY_WITH_JSON(KCMColorsFactory, "kcm_baloofile.json", registerPlugin<Baloo::ServerConfigModule>(); registerPlugin<BalooData>();)
 
+static QString balooDatabaseLocation()
+{
+    // First consult the environment variable, in case the index has been
+    // relocated manually
+    QString location = QString::fromLocal8Bit(qgetenv("BALOO_DB_PATH"));
+    if (location.isEmpty()) {
+        location = QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation) + QLatin1String("/baloo/index");
+    }
+    return location;
+}
+
 using namespace Baloo;
 
 ServerConfigModule::ServerConfigModule(QObject *parent, const QVariantList &args)
@@ -109,4 +121,14 @@ BalooSettings *ServerConfigModule::balooSettings() const
     return m_data->settings();
 }
 
+void ServerConfigModule::deleteIndex()
+{
+    QFile(balooDatabaseLocation()).remove();
+}
+
+QString ServerConfigModule::indexFileSize()
+{
+    return KFormat().formatByteSize(QFile(balooDatabaseLocation()).size());
+}
+
 #include "kcm.moc"

kcms/baloo/kcm.h

@@ -43,6 +43,9 @@ public:
     BalooSettings *balooSettings() const;
     FilteredFolderModel *filteredModel() const;
 
+    Q_INVOKABLE void deleteIndex();
+    Q_INVOKABLE QString indexFileSize();
+
 public Q_SLOTS:
     void load() override;
     void save() override;

kcms/baloo/package/contents/ui/main.qml

@@ -59,6 +59,25 @@ KCM.SimpleKCM {
         anchors.fill: parent
         anchors.margins: Kirigami.Units.largeSpacing
 
+        Kirigami.InlineMessage {
+            id: indexingDisabledWarning
+            Layout.fillWidth: true
+            visible: !kcm.balooSettings.indexingEnabled && !kcm.needsSave
+            type: Kirigami.MessageType.Warning
+            showCloseButton: true
+            text: i18n("Do you want to delete the saved index data? %1 of space will be freed, but if indexing is re-enabled later, the entire index will have to be re-created from scratch. This may take some time, depending on how many files you have.", kcm.indexFileSize());
+            actions: [
+                Kirigami.Action {
+                    text: i18n("Delete Index Data")
+                    icon.name: "edit-delete"
+                    onTriggered: {
+                        kcm.deleteIndex();
+                        indexingDisabledWarning.visible = false;
+                    }
+                }
+            ]
+        }
+
         QQC2.Label {
             text: i18n("File Search helps you quickly locate all your files based on their content.")
         }