[enh] currency converter engine added

searx/engines/currency_convert.py

@@ -0,0 +1,45 @@
+
+categories = []
+url = 'http://finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s={query}=X'
+
+def request(query, params):
+    try:
+        # eg.: "X EUR in USD"
+        ammount, from_currency, _, to_currency = query.split()
+        ammount = float(ammount)
+    except:
+        # wrong params
+        return params
+
+    q = (from_currency+to_currency).upper()
+    if not q.isalpha():
+        return params
+
+    params['url'] = url.format(query=q)
+    params['ammount'] = ammount
+    params['from'] = from_currency
+    params['to'] = to_currency
+
+    return params
+
+
+def response(resp):
+    global base_url
+    results = []
+    try:
+        _,conversion_rate,_ = resp.text.split(',', 2)
+        conversion_rate = float(conversion_rate)
+    except:
+        return results
+
+    title = '{0} {1} in {2} is {3}'.format(resp.search_params['ammount']
+                                          ,resp.search_params['from']
+                                          ,resp.search_params['to']
+                                          ,resp.search_params['ammount']*conversion_rate
+                                          )
+
+    content = '1 {0} is {1} {2}'.format(resp.search_params['from'], conversion_rate, resp.search_params['to'])
+    url = 'http://finance.yahoo.com/currency/converter-results/20131104/{0}-{1}-to-{2}.html'.format(resp.search_params['ammount'], resp.search_params['from'].lower(), resp.search_params['to'].lower())
+    results.append({'title': title, 'content': content, 'url': url})
+
+    return results