wolframalpha.py: gets results from WA (not using the commercial API)-- works pretty well

core/main.py

@@ -16,7 +16,7 @@ class Input(object):
         self.host = host
         self.paraml = paraml        # params[-1] without the :
         self.msg = msg
-        self.chan = paraml[0]
+        self.chan = paraml[0].lower()
         if self.chan == conn.nick:  # is a PM
             self.chan = nick
 

plugins/wolframalpha.py

@@ -0,0 +1,50 @@
+import re
+import urllib2
+
+from lxml import html
+
+from util import hook
+
+@hook.command
+@hook.command('wa')
+def wolframalpha(inp):
+    ".wa/.wolframalpha <query> -- scrapes Wolfram Alpha's" \
+            "results for <query>"
+
+    if not inp:
+        return wolframalpha.__query__
+
+    url = "http://www.wolframalpha.com/input/?i=%s&asynchronous=false"
+
+    h = html.parse(url % urllib2.quote(inp, safe=''))
+
+    pods = h.xpath("//div[@class='pod ']")
+
+    pod_texts = []
+    for pod in pods: 
+        heading = pod.find('h1/span').text_content().strip()
+        results = []
+        for image in pod.xpath('div/div[@class="output"]/img'):
+            alt = image.attrib['alt'].strip()
+            alt = alt.replace('\\n', '; ')
+            alt = re.sub(r'\s+', ' ', alt)
+            if alt:
+                results.append(alt)
+        if results:
+            pod_texts.append(heading + ' ' + '|'.join(results))
+
+    ret = '. '.join(pod_texts[1:]) # first pod is the input
+
+    if not ret: 
+        if not pod_texts:
+            return 'no results'
+        ret = pod_texts[0] # definite integrals have only the result pod first
+
+    if len(ret) > 430:        
+        ret = ret[:ret.rfind(' ', 0, 430)]
+        ret = re.sub(r'\W+$', '', ret) + '...'
+
+    if not ret:
+        return 'no result'
+
+    return ret