Make Qt5WebEngine optional

Qt5WebEngine is a very big package and not easily available on every
architecture. It should be optional at least when easily possible.
Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

CMakeLists.txt

@@ -16,10 +16,17 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 find_package(ECM ${KF5_MIN_VERSION} REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules" ${ECM_MODULE_PATH})
 
+include(FeatureSummary)
+
 find_package(Intltool REQUIRED)
 find_package(KAccounts REQUIRED)
 
-find_package(Qt5 ${QT_REQUIRED_VERSION} CONFIG REQUIRED Core Qml WebEngine)
+find_package(Qt5 ${QT_REQUIRED_VERSION} CONFIG REQUIRED Core Qml)
+find_package(Qt5WebEngine ${QT_REQUIRED_VERSION} CONFIG)
+set_package_properties(Qt5WebEngine
+        PROPERTIES TYPE OPTIONAL
+        PURPOSE "Required for Nextcloud Accounts plugin"
+        )
 find_package(KF5 ${KF5_MIN_VERSION} REQUIRED KIO I18n Declarative Package)
 
 include(KDEInstallDirs)

plugins/CMakeLists.txt

 add_subdirectory(owncloud-ui)
-add_subdirectory(nextcloud-ui)
\ No newline at end of file
+if(Qt5WebEngine_FOUND)
+    add_subdirectory(nextcloud-ui)
+endif()

providers/CMakeLists.txt

-file(GLOB provider_in_files *.provider.in)
-foreach(provider_in_file ${provider_in_files})
-    kaccounts_add_provider(${provider_in_file})
-endforeach()
+kaccounts_add_provider(google.provider.in)
+kaccounts_add_provider(owncloud.provider.in)
+if(Qt5WebEngine_FOUND)
+    kaccounts_add_provider(nextcloud.provider.in)
+endif()

services/CMakeLists.txt

-file(GLOB service_files_in *.service.in)
-foreach(service_file_in ${service_files_in})
-    kaccounts_add_service(${service_file_in})
-endforeach()
+kaccounts_add_service(owncloud-storage.service.in)
+if(Qt5WebEngine_FOUND)
+    kaccounts_add_service(nextcloud-contacts.service.in)
+    kaccounts_add_service(nextcloud-storage.service.in)
+endif()