eo - add object names/ids esp useful for erigo as it wants object names

also evas objects have names too, so add this as this was discussed
and now the feature is in. there is nothing to find objects by name
yet. that's more api's and features to add after this.

@feature

src/lib/eo/eo_base.eo

@@ -73,6 +73,23 @@ abstract Eo.Base ()
             parent: Eo.Base * @nullable; [[the new parent]]
          }
       }
+      @property id {
+         [[ The id/name of the object.
+
+           Every object can have a string name. Names may not contain
+           the slash "/" character. It is illegal. Using it in a name
+           will result in undefined behavior later on. An empty string
+           is considered the same as a NULL string or no string for the
+           name/id at all.
+         ]]
+         set {
+         }
+         get {
+         }
+         values {
+           id: const(char)* @nullable; [[the id/name]]
+         }
+      }
       @property event_global_freeze_count @class {
          get {
             [[Return freeze events of object.

src/lib/eo/eo_base_class.c

@@ -23,6 +23,7 @@ typedef struct
    Eina_Inlist *generic_data;
    Eo ***wrefs;
 
+   const char *id;
    Eo_Callback_Description *callbacks;
    unsigned short walking_list;
    unsigned short event_freeze_count;
@@ -261,6 +262,20 @@ _eo_base_key_obj_del(Eo *obj EINA_UNUSED, Eo_Base_Data *pd, const char *key)
      }
 }
 
+EOLIAN static void
+_eo_base_id_set(Eo *obj EINA_UNUSED, Eo_Base_Data *pd, const char *id)
+{
+   if ((id) && (!id[0])) id = NULL;
+   eina_stringshare_replace(&(pd->id), id);
+}
+
+EOLIAN static const char *
+_eo_base_id_get(Eo *obj EINA_UNUSED, Eo_Base_Data *pd)
+{
+   return pd->id;
+}
+
+
 EOLIAN static void
 _eo_base_parent_set(Eo *obj, Eo_Base_Data *pd, Eo *parent_id)
 {
@@ -1146,6 +1161,9 @@ _eo_base_destructor(Eo *obj, Eo_Base_Data *pd)
    _wref_destruct(pd);
    _eo_callback_remove_all(pd);
 
+   eina_stringshare_del(pd->id);
+   pd->id = NULL;
+
    _eo_condtor_done(obj);
 }
 

src/tests/eo/suite/eo_test_general.c

@@ -1037,6 +1037,36 @@ START_TEST(eo_del_intercept)
 }
 END_TEST
 
+START_TEST(eo_name)
+{
+   eo_init();
+   Eo *obj = eo_add(SIMPLE_CLASS, NULL);
+   const char *id;
+
+   id = eo_id_get(obj);
+   fail_if(NULL != id);
+
+   eo_id_set(obj, "Hello");
+   id = eo_id_get(obj);
+   fail_if(NULL == id);
+   fail_if(!!strcmp(id, "Hello"));
+
+   eo_id_set(obj, "Hello");
+   eo_id_set(obj, "");
+   id = eo_id_get(obj);
+   fail_if(NULL != id);
+
+   eo_id_set(obj, "Hello");
+   eo_id_set(obj, NULL);
+   id = eo_id_get(obj);
+   fail_if(NULL != id);
+
+   eo_del(obj);
+
+   eo_shutdown();
+}
+END_TEST
+
 void eo_test_general(TCase *tc)
 {
    tcase_add_test(tc, eo_simple);
@@ -1055,4 +1085,5 @@ void eo_test_general(TCase *tc)
    tcase_add_test(tc, eo_pointers_indirection);
    tcase_add_test(tc, eo_add_failures);
    tcase_add_test(tc, eo_del_intercept);
+   tcase_add_test(tc, eo_name);
 }