fix yacy-engine and add comments

* add language support
* add image-support
* add basic-implementation for video, music and file handling
* refactore engine
* add comments

searx/engines/yacy.py

@@ -1,40 +1,89 @@
+## Yacy (Web, Images, Videos, Music, Files)
+# 
+# @website     http://yacy.net
+# @provide-api yes (http://www.yacy-websuche.de/wiki/index.php/Dev:APIyacysearch)
+# 
+# @using-api   yes
+# @results     JSON
+# @stable      yes
+# @parse       (general)    url, title, content, publishedDate
+# @parse       (images)     url, title, img_src
+#
+# @todo        parse video, audio and file results
+
 from json import loads
 from urllib import urlencode
+from dateutil import parser
 
-url = 'http://localhost:8090'
-search_url = '/yacysearch.json?{query}&maximumRecords=10'
+# engine dependent config
+categories = ['general', 'images'] #TODO , 'music', 'videos', 'files'
+paging = True
+language_support = True
+number_of_results = 5
+
+# search-url
+base_url = 'http://localhost:8090'
+search_url = '/yacysearch.json?{query}&startRecord={offset}&maximumRecords={limit}&contentdom={search_type}&resource=global'
+
+# yacy specific type-definitions
+search_types = {'general': 'text',
+                'images': 'image',
+                'files': 'app',               
+                'music': 'audio',
+                'videos': 'video'}
 
 
+# do search-request
 def request(query, params):
-    params['url'] = url + search_url.format(query=urlencode({'query': query}))
+    offset = (params['pageno'] - 1) * number_of_results
+    search_type = search_types.get(params['category'], '0')
+
+    params['url'] = base_url + search_url.format(query=urlencode({'query': query}),
+                                                 offset=offset,
+                                                 limit=number_of_results,
+                                                 search_type=search_type)
+
+    # add language tag if specified
+    if params['language'] != 'all':
+        params['url'] += '&lr=lang_' + params['language'].split('_')[0]
+
     return params
 
 
+# get response from search-request
 def response(resp):
+    results = []
+
     raw_search_results = loads(resp.text)
 
+    # return empty array if there are no results
     if not raw_search_results:
         return []
 
     search_results = raw_search_results.get('channels', {})[0].get('items', [])
 
-    results = []
-
+    if resp.search_params['category'] == 'general':
+        # parse general results
         for result in search_results:
-        tmp_result = {}
-        tmp_result['title'] = result['title']
-        tmp_result['url'] = result['link']
-        tmp_result['content'] = ''
+            publishedDate = parser.parse(result['pubDate'])
 
-        if result['description']:
-            tmp_result['content'] += result['description'] + "<br/>"
+            # append result
+            results.append({'url': result['link'],
+                        'title': result['title'],
+                        'content': result['description'],
+                        'publishedDate': publishedDate})
 
-        if result['pubDate']:
-            tmp_result['content'] += result['pubDate'] + "<br/>"
+    elif resp.search_params['category'] == 'images':
+        # parse image results
+        for result in search_results:
+            # append result
+            results.append({'url': result['url'],
+                        'title': result['title'],
+                        'content': '',
+                        'img_src': result['image'],
+                        'template': 'images.html'})
 
-        if result['size'] != '-1':
-            tmp_result['content'] += result['sizename']
-
-        results.append(tmp_result)
+    #TODO parse video, audio and file results
 
+    # return results
     return results

searx/settings.yml

@@ -143,6 +143,13 @@ engines:
     locale : en-US
     shortcut : vm
 
+#  - name : yacy
+#    engine : yacy
+#    shortcut : ya
+#    base_url : 'http://localhost:8090'
+#    number_of_results : 5
+#    timeout: 3.0
+
 locales:
     en : English
     de : Deutsch