h/plugins/wolframalpha.py

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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.__doc__
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')
if heading is not None:
heading = heading.text_content().strip()
if heading.startswith('Input'):
continue
else:
continue
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) # first pod is the input
if not pod_texts:
return 'no results'
2010-02-17 23:24:52 +00:00
ret = re.sub(r'\\(.)', r'\1', ret)
def unicode_sub(match):
return unichr(int(match.group(1), 16))
ret = re.sub(r'\\:([0-9a-z]{4})', unicode_sub, ret)
if len(ret) > 430:
ret = ret[:ret.rfind(' ', 0, 430)]
ret = re.sub(r'\W+$', '', ret) + '...'
if not ret:
return 'no result'
return ret