[enh] yahoo engine added

searx/engines/yahoo.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+
+from urllib import urlencode
+from searx.engines.xpath import extract_text, extract_url
+from lxml import html
+
+categories = ['general']
+search_url = 'http://search.yahoo.com/search?{query}&b={offset}'
+results_xpath = '//div[@class="res"]'
+url_xpath = './/h3/a/@href'
+title_xpath = './/h3/a'
+content_xpath = './/div[@class="abstr"]'
+suggestion_xpath = '//div[@id="satat"]//a'
+
+paging = True
+
+
+def request(query, params):
+    offset = (params['pageno'] - 1) * 10 + 1
+    params['url'] = search_url.format(offset=offset,
+                                      query=urlencode({'p': query}))
+    print params['url']
+    return params
+
+
+def response(resp):
+    results = []
+    dom = html.fromstring(resp.text)
+
+    for result in dom.xpath(results_xpath):
+        url = extract_url(result.xpath(url_xpath), search_url)
+        title = extract_text(result.xpath(title_xpath)[0])
+        content = extract_text(result.xpath(content_xpath)[0])
+        results.append({'url': url, 'title': title, 'content': content})
+
+    if not suggestion_xpath:
+        return results
+
+    for suggestion in dom.xpath(suggestion_xpath):
+        results.append({'suggestion': extract_text(suggestion)})
+
+    return results