[enh] oscar_template: initial osm-map support for map results

* TODO: remove leaflet.min.css if not required

searx/engines/openstreetmap.py

@@ -15,7 +15,7 @@ categories = ['map']
 paging = False
 
 # search-url
-url = 'https://nominatim.openstreetmap.org/search/{query}?format=json'
+url = 'https://nominatim.openstreetmap.org/search/{query}?format=json&polygon_geojson=1'
 
 result_base_url = 'https://openstreetmap.org/{osm_type}/{osm_id}'
 
@@ -38,9 +38,23 @@ def response(resp):
         osm_type = r.get('osm_type', r.get('type'))
         url = result_base_url.format(osm_type=osm_type,
                                      osm_id=r['osm_id'])
+
+        geojson =  r.get('geojson')
+
+        # if no geojson is found and osm_type is a node, add geojson Point
+        if not geojson and\
+           osm_type == 'node':
+            geojson = {u'type':u'Point', 
+                       u'coordinates':[r['lon'],r['lat']]}
+
         # append result
-        results.append({'title': title,
+        results.append({'template': 'map.html',
+                        'title': title,
                         'content': '',
+                        'longitude': r['lon'],
+                        'latitude': r['lat'],
+                        'boundingbox': r['boundingbox'],
+                        'geojson': geojson,
                         'url': url})
 
     # return results