Add a way to clear the OSM tile cache

Useful for debugging tile download or backend issues.

src/app/DevelopmentModePage.qml

@@ -44,6 +44,11 @@ Kirigami.ScrollablePage {
             Layout.fillWidth: true
             onClicked: DevelopmentModeController.purgeMapCSS();
         }
+        QQC2.Button {
+            text: "Clear OSM Tile Cache"
+            Layout.fillWidth: true
+            onClicked: DevelopmentModeController.clearOsmTileCache();
+        }
 
         QQC2.Button {
             text: "Enable KPT Logging"

src/app/developmentmodecontroller.cpp

@@ -71,3 +71,16 @@ void DevelopmentModeController::purgeMapCSS()
     path += QLatin1String("/org.kde.kosmindoormap/assets/css/");
     QDir(path).removeRecursively();
 }
+
+void DevelopmentModeController::clearOsmTileCache()
+{
+    // see KOSMIndoorMap::TileCache
+    QString base;
+    if (!qEnvironmentVariableIsSet("KOSMINDOORMAP_CACHE_PATH")) {
+        base = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation)
+            + QLatin1String("/org.kde.osm/vectorosm");
+    } else {
+        base = qEnvironmentVariable("KOSMINDOORMAP_CACHE_PATH");
+    }
+    QDir(base + QLatin1String("/17")).removeRecursively();
+}

src/app/developmentmodecontroller.h

@@ -18,6 +18,7 @@ public:
     Q_INVOKABLE void enablePublicTransportLogging();
     Q_INVOKABLE void importMapCSS(const QUrl &url);
     Q_INVOKABLE void purgeMapCSS();
+    Q_INVOKABLE void clearOsmTileCache();
 };
 
 Q_DECLARE_METATYPE(DevelopmentModeController)