[enh] duckduckgo definitions

searx/engines/duckduckgo_definitions.py

+import json
+from searx import base_result_template
+
+def request(query, params):
+    params['url'] = 'http://api.duckduckgo.com/?q=%s&format=json&pretty=0' % query
+    return params
+
+
+def response(resp):
+    search_res = json.loads(resp.text)
+    results = []
+    if 'Definition' in search_res:
+        res = {'title'   : search_res.get('Heading', '')
+              ,'content' : search_res.get('Definition', '')
+              ,'url'     : search_res.get('AbstractURL', '')
+              }
+        results.append(base_result_template.format(**res))
+
+    return results
+
+#from lxml import html
+#def request(query, params):
+#    params['method']    = 'POST'
+#    params['url']       = 'https://duckduckgo.com/html'
+#    params['data']['q'] = query
+#    return params
+#
+#
+#def response(resp):
+#    dom = html.fromstring(resp.text)
+#    results = dom.xpath('//div[@class="results_links results_links_deep web-result"]')
+#    return [html.tostring(x) for x in results]