Let search_core return extension as real list.

This lets search.html deal with real objects instead of playing with
dumed-down strings.

frontends/etiquette_flask/backend/common.py

@@ -33,6 +33,7 @@ site.jinja_env.add_extension('jinja2.ext.do')
 site.jinja_env.trim_blocks = True
 site.jinja_env.lstrip_blocks = True
 site.jinja_env.filters['bytestring'] = jinja_filters.bytestring
+site.jinja_env.filters['comma_join'] = jinja_filters.comma_join
 site.jinja_env.filters['file_link'] = jinja_filters.file_link
 site.jinja_env.filters['sort_tags'] = jinja_filters.sort_tags
 site.jinja_env.filters['timestamp_to_8601'] = jinja_filters.timestamp_to_8601

frontends/etiquette_flask/backend/endpoints/photo_endpoints.py

@@ -376,18 +376,14 @@ def get_search_core():
         'warning_bag': warning_bag,
         'give_back_parameters': True
     }
-    #print(search_kwargs)
+    # print(search_kwargs)
     search_generator = common.P.search(**search_kwargs)
     # Because of the giveback, first element is cleaned up kwargs
     search_kwargs = next(search_generator)
+    # print(search_kwargs)
 
     # The search has converted many arguments into sets or other types.
     # Convert them back into something that will display nicely on the search form.
-    join_helper = lambda x: ', '.join(x) if x else None
-    search_kwargs['extension'] = join_helper(search_kwargs['extension'])
-    search_kwargs['extension_not'] = join_helper(search_kwargs['extension_not'])
-    search_kwargs['mimetype'] = join_helper(search_kwargs['mimetype'])
-
     author_helper = lambda users: ', '.join(user.username for user in users) if users else None
     search_kwargs['author'] = author_helper(search_kwargs['author'])
 
@@ -469,6 +465,15 @@ def get_search_html():
 @session_manager.give_token
 def get_search_json():
     search_results = get_search_core()
+    search_kwargs = search_results['search_kwargs']
+
+    # The search has converted many arguments into sets or other types.
+    # Convert them back into something that will display nicely on the search form.
+    join_helper = lambda x: ', '.join(x) if x else None
+    search_kwargs['extension'] = join_helper(search_kwargs['extension'])
+    search_kwargs['extension_not'] = join_helper(search_kwargs['extension_not'])
+    search_kwargs['mimetype'] = join_helper(search_kwargs['mimetype'])
+
     search_results['results'] = [
         etiquette.jsonify.photo(result, include_albums=False)
         if isinstance(result, etiquette.objects.Photo) else

frontends/etiquette_flask/backend/jinja_filters.py

@@ -10,6 +10,11 @@ def bytestring(x):
     except Exception as e:
         return '??? b'
 
+def comma_join(l):
+    if not l:
+        return ''
+    return ', '.join(l)
+
 def file_link(photo, short=False):
     if short:
         return f'/file/{photo.id}{photo.dot_extension}'

frontends/etiquette_flask/templates/search.html

@@ -259,15 +259,15 @@
             name="filename" placeholder="Filename">
 
             <input type="text" class="basic_param"
-            {%if search_kwargs['mimetype']%} value="{{search_kwargs['mimetype']}}" {%endif%}
+            value="{{search_kwargs['mimetype']|comma_join}}"
             name="mimetype" placeholder="Mimetype(s)">
 
             <input type="text" class="basic_param"
-            {%if search_kwargs['extension']%} value="{{search_kwargs['extension']}}" {%endif%}
+            value="{{search_kwargs['extension']|comma_join}}"
             name="extension" placeholder="Extension(s)">
 
             <input type="text" class="basic_param"
-            {%if search_kwargs['extension_not']%} value="{{search_kwargs['extension_not']}}" {%endif%}
+            value="{{search_kwargs['extension_not']|comma_join}}"
             name="extension_not" placeholder="Forbid extension(s)">
 
             <input type="text" class="basic_param"