eolian: prepare to defer all dependency parses

Dependencies are now going to be parsed strictly after the main
file, to allow proper dependency cycle behavior in all places. For
now there is correct parsing of deferred deps but they're not
queued yet.

src/lib/eolian/eolian_database.c

@@ -688,27 +688,41 @@ _eolian_file_parse_nodep(const char *filepath)
    return eo_parser_database_fill(eopath, !is_eo);
 }
 
-static Eolian_Unit unit_tmp;
-
-EAPI const Eolian_Unit *
-eolian_file_parse(const char *filepath)
+static Eina_Bool
+_parse_deferred()
 {
+   Eina_Hash *defer = _defereos;
+   if (!defer || !eina_hash_population(defer))
+     return EINA_TRUE;
+   /* clean room for more deps for later parsing */
+   _defereos = eina_hash_string_small_new(NULL);
+   Eina_Iterator *itr = eina_hash_iterator_data_new(defer);
    const char *dep;
-   if (!_eolian_file_parse_nodep(filepath))
-     return NULL;
-   /* parse doc dependencies (deferred eo files) */
-   Eina_Iterator *itr = eina_hash_iterator_data_new(_defereos);
    EINA_ITERATOR_FOREACH(itr, dep)
      {
         if (!_eolian_file_parse_nodep(dep))
           {
              eina_iterator_free(itr);
              eina_hash_free_buckets(_defereos);
-             return NULL;
+             eina_hash_free(defer);
+             return EINA_FALSE;
           }
      }
    eina_iterator_free(itr);
-   eina_hash_free_buckets(_defereos);
+   eina_hash_free(defer);
+   /* in case more deps were queued in, parse them */
+   return _parse_deferred();
+}
+
+static Eolian_Unit unit_tmp;
+
+EAPI const Eolian_Unit *
+eolian_file_parse(const char *filepath)
+{
+   if (!_eolian_file_parse_nodep(filepath))
+     return NULL;
+   if (!_parse_deferred())
+     return NULL;
    return &unit_tmp;
 }
 
@@ -716,6 +730,7 @@ static Eina_Bool _tfile_parse(const Eina_Hash *hash EINA_UNUSED, const void *key
 {
    Eina_Bool *ret = fdata;
    if (*ret) *ret = eo_parser_database_fill(data, EINA_TRUE);
+   if (*ret) *ret = _parse_deferred();
    return *ret;
 }
 
@@ -735,6 +750,7 @@ static Eina_Bool _file_parse(const Eina_Hash *hash EINA_UNUSED, const void *key
 {
    Eina_Bool *ret = fdata;
    if (*ret) *ret = eo_parser_database_fill(data, EINA_FALSE);
+   if (*ret) *ret = _parse_deferred();
    return *ret;
 }