Add ecm_generate_dbus_service_file

Summary:
It serves as a replacement for `kdbusaddons_generate_dbus_service_file`.

An application can be a DBus-activated service just fine without using KDBusAddons.
Moreover, this new module uses named arguments for future-proofing, and adds support for specifying a `SystemdService`.
It also cleans up the confusion on what the "path" is about: Rather than requiring to specify executable and path separately, we just extract the executable file name on Windows, if necessary.

Usage:
```
ecm_generate_dbus_service_file(NAME org.kde.kded5
                               EXECUTABLE ${KDE_INSTALL_FULL_BINDIR}/kded5
                               SYSTEMD_SERVICE plasma-kded)
```

Test Plan:
* Was able to generate a kded service file
* Was able to generate a kded service file with `SystemdUnit`
* Verified that it moaned when executable wasn't an absolute path
* Untested on Windwos

Reviewers: #frameworks, davidedmundson, kossebau, kfunk, habacker

Subscribers: kde-frameworks-devel, kde-buildsystem

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D29051

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/ECMGenerateDBusServiceFileTest/check_tree.cmake.in b/tests/ECMGenerateDBusServiceFileTest/check_tree.cmake.in
new file mode 100644
index 00000000..c5fe51c9
--- /dev/null
+++ b/tests/ECMGenerateDBusServiceFileTest/check_tree.cmake.in
@@ -0,0 +1,20 @@
+set(EXPECTED "@CMAKE_CURRENT_SOURCE_DIR@/expected")
+set(ACTUAL "@CMAKE_INSTALL_PREFIX@")
+
+# Compares files in two directories, emits a fatal error if the top level files are different
+# Takes a directory of expected files, and a directory of output files
+function(compare_dirs expected output )
+    file(GLOB files "${expected}/*")
+    foreach(file ${files})
+        get_filename_component(name ${file} NAME)
+
+        execute_process(COMMAND ${CMAKE_COMMAND} -E compare_files ${file} "${output}/${name}"
+                                        RESULT_VARIABLE test_result
+        )
+        If (NOT test_result EQUAL 0)
+            message(FATAL_ERROR "Test failed: ${file} doesn't match ${output}/${name}!")
+        endif()
+    endforeach()
+endfunction()
+
+compare_dirs(${EXPECTED} ${ACTUAL}/test )