Async: initial support for native chaining of KJobs

It is now possible use KJob-derived jobs with libasync without having to write
lambda wrappers.

auto job = Async::start<ReturnType, MyKJob, MyKJob::result, Args ...)
           .then<ReturnType, OtherKJob, OtherKJob::result, PrevKJobReturnType>();

job.exec(arg1, arg2, ...);

The reason for this approach (instead of taking KJob* as an argument is that
we usually want the KJob ctor arguments to depend on result of previous job.
At least in case of Async::start() however it makes sense to support passing
KJob* as an argument (not yet implemented).

In future we should also support custom error handlers.

The KJob integration is build-time optional, but enabled by default (pass
-DWITH_KJOB=FALSE to CMake to disable).

Adds KCoreAddons dependency.

1 files changed, 5 insertions, 1 deletions

diff --git a/async/src/CMakeLists.txt b/async/src/CMakeLists.txt
index 7d17f2b..6f8ab63 100644
--- a/async/src/CMakeLists.txt
+++ b/async/src/CMakeLists.txt
@@ -8,5 +8,9 @@ set(async_SRCS
 )
 
 add_library(${PROJECT_NAME} SHARED ${async_SRCS})
-target_link_libraries(${PROJECT_NAME} Qt5::Core)
+target_link_libraries(${PROJECT_NAME} PUBLIC Qt5::Core)
+if (WITH_KJOB)
+    target_link_libraries(${PROJECT_NAME} PUBLIC KF5::CoreAddons)
+endif ()
+
 install(TARGETS ${PROJECT_NAME} ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})