[mod] searx.search.EngineRef: remove from_bang parameter

from_bang is True when the user query contains a bang.
In this case the category is also set to 'none'.

from_bang only usage was in searx.webadapter.parse_specific :
if from_bang is True, then the EngineRef category is ignored and force to 'none'.

This commit also removes the searx.webadapter.parse_sepecific function.

searx/query.py

@@ -125,12 +125,12 @@ class RawTextQuery:
                     searx_query_part = True
                     engine_name = engine_shortcuts[prefix]
                     if engine_name in engines:
-                        self.enginerefs.append(EngineRef(engine_name, 'none', True))
+                        self.enginerefs.append(EngineRef(engine_name, 'none'))
 
                 # check if prefix is equal with engine name
                 elif prefix in engines:
                     searx_query_part = True
-                    self.enginerefs.append(EngineRef(prefix, 'none', True))
+                    self.enginerefs.append(EngineRef(prefix, 'none'))
 
                 # check if prefix is equal with categorie name
                 elif prefix in categories:

searx/search/__init__.py

@@ -52,18 +52,17 @@ def initialize(settings_engines=None):
 
 class EngineRef:
 
-    __slots__ = 'name', 'category', 'from_bang'
+    __slots__ = 'name', 'category'
 
-    def __init__(self, name: str, category: str, from_bang: bool=False):
+    def __init__(self, name: str, category: str):
         self.name = name
         self.category = category
-        self.from_bang = from_bang
 
     def __repr__(self):
-        return "EngineRef({!r}, {!r}, {!r})".format(self.name, self.category, self.from_bang)
+        return "EngineRef({!r}, {!r})".format(self.name, self.category)
 
     def __eq__(self, other):
-        return self.name == other.name and self.category == other.category and self.from_bang == other.from_bang
+        return self.name == other.name and self.category == other.category
 
 
 class SearchQuery:

searx/webadapter.py

@@ -109,17 +109,6 @@ def parse_timeout(form: Dict[str, str], raw_text_query: RawTextQuery) -> Optiona
         raise SearxParameterException('timeout_limit', timeout_limit)
 
 
-def parse_specific(raw_text_query: RawTextQuery) -> Tuple[List[EngineRef], List[str]]:
-    query_engineref_list = raw_text_query.enginerefs
-    additional_categories = set()
-    for engineref in raw_text_query.enginerefs:
-        if engineref.from_bang:
-            additional_categories.add('none')
-        else:
-            additional_categories.add(engineref.category)
-    return query_engineref_list
-
-
 def parse_category_form(query_categories: List[str], name: str, value: str) -> None:
     if name == 'categories':
         query_categories.extend(categ for categ in map(str.strip, value.split(',')) if categ in categories)
@@ -232,7 +221,7 @@ def get_search_query_from_webapp(preferences: Preferences, form: Dict[str, str])
     if not is_locked('categories') and raw_text_query.enginerefs and raw_text_query.specific:
         # if engines are calculated from query,
         # set categories by using that informations
-        query_engineref_list = parse_specific(raw_text_query)
+        query_engineref_list = raw_text_query.enginerefs
     else:
         # otherwise, using defined categories to
         # calculate which engines should be used