Lock uwsm desktop file behind feature flag

The file in the repo cannot be used in NixOS due to missing full paths,
and the fact that `uwsm` does not have access to `PATH` to find the
listed binaries. Might be useful in other situations as well.

CMakeLists.txt

@@ -224,8 +224,13 @@ else()
   add_compile_definitions(USES_SYSTEMD)
 
   # session file -uwsm
-  install(FILES ${CMAKE_SOURCE_DIR}/systemd/hyprland-uwsm.desktop
-          DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/wayland-sessions)
+  if(NO_UWSM)
+    message(STATUS "UWSM support is disabled...")
+  else()
+    message(STATUS "UWSM support is enabled (NO_UWSM not defined)...")
+    install(FILES ${CMAKE_SOURCE_DIR}/systemd/hyprland-uwsm.desktop
+            DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/wayland-sessions)
+  endif()
 endif()
 
 set(CPACK_PROJECT_NAME ${PROJECT_NAME})

meson.build

@@ -55,6 +55,7 @@ epoll_dep = dependency('epoll-shim', required: false) # timerfd on BSDs
 systemd_option = get_option('systemd')
 systemd = dependency('systemd', required: systemd_option)
 systemd_option.enable_auto_if(systemd.found())
+get_option('uwsm').enable_auto_if(systemd_option.allowed())
 
 if (systemd_option.enabled())
   message('Enabling systemd integration')

meson_options.txt

@@ -1,4 +1,5 @@
 option('xwayland', type: 'feature', value: 'auto', description: 'Enable support for X11 applications')
 option('systemd', type: 'feature', value: 'auto', description: 'Enable systemd integration')
+option('uwsm', type: 'feature', value: 'auto', description: 'Enable uwsm integration (only if systemd is enabled)')
 option('legacy_renderer', type: 'feature', value: 'disabled', description: 'Enable legacy renderer')
 option('tracy_enable', type: 'boolean', value: false , description: 'Enable profiling')

systemd/meson.build

@@ -1,5 +1,7 @@
-install_data(                                                          
-  'hyprland-uwsm.desktop',                                                  
-  install_dir: join_paths(get_option('datadir'), 'wayland-sessions'),  
-  install_tag: 'runtime',                                              
-)                                                                      
+if (get_option('uwsm'))
+  install_data(
+    'hyprland-uwsm.desktop',
+    install_dir: join_paths(get_option('datadir'), 'wayland-sessions'),
+    install_tag: 'runtime',
+  )
+endif