meson: Add "pipeline-preview" to printed summary

meson.build

@@ -166,3 +166,8 @@ if build_clapper
     summary(name, clapper_available_features.contains(name) ? 'Yes' : 'No', section: 'Features')
   endforeach
 endif
+if build_clapperapp
+  foreach name : clapperapp_possible_functionalities
+    summary(name, clapperapp_available_functionalities.contains(name)  ? 'Yes' : 'No', section: 'Functionalities')
+  endforeach
+endif

src/bin/clapper-app/meson.build

@@ -94,12 +94,18 @@ clapperapp_c_args = [
   '-DGST_USE_UNSTABLE_API',
 ]
 
+clapperapp_possible_functionalities = [
+  'pipeline-preview',
+]
+clapperapp_available_functionalities = []
+
 pp_option = get_option('pipeline-preview')
 
 if not pp_option.disabled()
   if cgraph_dep.found() and gvc_dep.found()
     clapperapp_c_args += ['-DHAVE_GRAPHVIZ']
     clapperapp_deps += [cgraph_dep, gvc_dep]
+    clapperapp_available_functionalities += 'pipeline-preview'
   elif pp_option.enabled()
     error('pipeline-preview option was enabled, but required dependencies were not found')
   endif