harmonize use of callback with set_entrance_filter

All other functions except a simple function, so do this here as well.

docs/customize/Import-Styles.md

@@ -76,8 +76,8 @@ and may be returned with the result [on request](../api/Search.md#output-details
 
 !!! danger
     Some tags in the extratags category are used by Nominatim to better
-    classify the place. You want to make sure these are always present
-    in custom styles.
+    classify the place. These tags will always be added, independent of
+    any settings in the style.
 
 Configuring the style means deciding which key and/or key/value is used
 in which category.
@@ -269,7 +269,7 @@ in turn take precedence over prefix matches.
 
 | Name     | Description |
 | :-----   | :---------- |
-| required | Tags that Nominatim will use for various computations when present in extratags. Always include these. |
+| required | Tags that Nominatim will use for various computations when present in extratags. Automatically added. |
 
 In addition, all [presets from ignored tags](#presets_1) are accepted.
 
@@ -462,9 +462,9 @@ with a table with the following fields:
   will always be excluded, independently of this setting.
 
 To have even more fine-grained control over the output, you can also hand
-in a table with a single field `func` containing a callback for processing
-entrance information. The callback function receives a single parameter,
-the [osm2pgsql object](https://osm2pgsql.org/doc/manual.html#processing-callbacks).
+in a callback for processing entrance information. The callback function
+receives a single parameter, the
+[osm2pgsql object](https://osm2pgsql.org/doc/manual.html#processing-callbacks).
 This object itself must not be modified. The callback should return either
 `nil` when the object is not an entrance. Or it returns a table with a
 mandatory `entrance` field containing a string with the type of entrance

lib-lua/themes/nominatim/init.lua

@@ -943,17 +943,22 @@ function module.set_relation_types(data)
 end
 
 function module.set_entrance_filter(data)
+    if data == nil or type(data) == 'function' then
+        ENTRANCE_FUNCTION = data
+        return nil
+    end
+
     if type(data) == 'string' then
         local preset = data
-        data = PRESETS.ENTRACE_TABLE[data]
+        data = PRESETS.ENTRANCE_TABLE[data]
         if data == nil then
             error('Unknown preset for entrance table: ' .. preset)
         end
     end
 
-    ENTRANCE_FUNCTION = data and data.func
+    ENTRANCE_FUNCTION = nil
 
-    if data ~= nil and data.main_tags ~= nil and next(data.main_tags) ~= nil then
+    if data.main_tags ~= nil and next(data.main_tags) ~= nil then
         if data.extra_include ~= nil and next(data.extra_include) == nil then
             -- shortcut: no extra tags requested
             ENTRANCE_FUNCTION = function(o)

lib-lua/themes/nominatim/presets.lua

@@ -383,9 +383,9 @@ module.EXTRATAGS.required = {'wikipedia', 'wikipedia:*', 'wikidata', 'capital'}
 
 -- Defaults for the entrance table
 
-module.ENTRACE_TABLE = {}
+module.ENTRANCE_TABLE = {}
 
-module.ENTRACE_TABLE.default = {main_tags = {'entrance', 'routing:entrance'},
-                                extra_exclude = module.IGNORE_KEYS.metatags}
+module.ENTRANCE_TABLE.default = {main_tags = {'entrance', 'routing:entrance'},
+                                 extra_exclude = module.IGNORE_KEYS.metatags}
 
 return module

test/bdd/features/osm2pgsql/import/entrances.feature

@@ -109,9 +109,9 @@ Feature: Import of entrance objects by osm2pgsql
         Given the lua style file
             """
             local flex = require('import-full')
-            flex.set_entrance_filter{func = function(object)
+            flex.set_entrance_filter(function(object)
                 return {entrance='always', extratags = {ref = '1'}}
-            end}
+            end)
             """
         When loading osm data
           """