fix dailymotion engine and add comments to it

searx/engines/dailymotion.py

+## Dailymotion (Videos)
+# 
+# @website     https://www.dailymotion.com
+# @provide-api yes (http://www.dailymotion.com/developer)
+# 
+# @using-api   yes
+# @results     JSON
+# @stable      yes
+# @parse       url, title, thumbnail
+#
+# @todo        set content-parameter with correct data
+
 from urllib import urlencode
 from json import loads
 from lxml import html
 
+# engine dependent config
 categories = ['videos']
 locale = 'en_US'
+paging = True
 
+# search-url
 # see http://www.dailymotion.com/doc/api/obj-video.html
-search_url = 'https://api.dailymotion.com/videos?fields=title,description,duration,url,thumbnail_360_url&sort=relevance&limit=25&page={pageno}&{query}'  # noqa
-
-# TODO use video result template
-content_tpl = '<a href="{0}" title="{0}" ><img src="{1}" /></a><br />'
-
-paging = True
+search_url = 'https://api.dailymotion.com/videos?fields=title,description,duration,url,thumbnail_360_url&sort=relevance&limit=5&page={pageno}&{query}'  # noqa
 
 
+# do search-request
 def request(query, params):
     params['url'] = search_url.format(
         query=urlencode({'search': query, 'localization': locale}),
         pageno=params['pageno'])
+
     return params
 
 
+# get response from search-request
 def response(resp):
     results = []
+
     search_res = loads(resp.text)
+
+    # return empty array if there are no results
     if not 'list' in search_res:
-        return results
+        return []
+
+    # parse results
     for res in search_res['list']:
         title = res['title']
         url = res['url']
-        if res['thumbnail_360_url']:
-            content = content_tpl.format(url, res['thumbnail_360_url'])
-        else:
-            content = ''
-        if res['description']:
-            description = text_content_from_html(res['description'])
-            content += description[:500]
-        results.append({'url': url, 'title': title, 'content': content})
-    return results
+        #content = res['description']
+        content = ''
+        thumbnail = res['thumbnail_360_url']
 
+        results.append({'template': 'videos.html',
+                        'url': url,
+                        'title': title,
+                        'content': content,
+                        'thumbnail': thumbnail})
 
-def text_content_from_html(html_string):
-    desc_html = html.fragment_fromstring(html_string, create_parent=True)
-    return desc_html.text_content()
+    # return results
+    return results