2 # Minimalistic Python URL watcher
3 # 2008-03-04 Thomas Perl <thpinfo.com>
4 # http://thpinfo.com/2008/urlwatch
6 # 1. Create an "urls.txt" file and add one URL per
7 # line that you want to watch.
8 # 2. Add watch.py as a cronjob or run it manually.
9 # 3. If something changed, you'll get a diff output
10 # to stdout. If nothing changed, no output.
11 # 4. If you want to filter the web pages, because
12 # there is some dynamic content that _always_
13 # changes, create a "hooks.py" file that has a
14 # filter(url, data) -> filtered_data function
22 os
.chdir(os
.path
.dirname(sys
.argv
[0]))
24 if os
.path
.exists('hooks.py'):
25 from hooks
import filter
27 filter = lambda x
, y
: y
29 for url
in (x
for x
in open('urls.txt').read().splitlines() if not (x
.startswith('#') or x
.strip()=='')):
30 filename
= sha
.new(url
).hexdigest()
31 data
= filter(url
, urllib2
.urlopen(url
).read())
32 if os
.path
.exists(filename
):
33 old_data
= open(filename
).read()
34 diff
= ''.join(difflib
.unified_diff(old_data
.splitlines(1), data
.splitlines(1)))
36 print '%s\nCHANGED: %s\n%s\n%s\n%s\n\n' % ('*'*60, url
, '*'*60, diff
, '*'*60)
37 open(filename
, 'w').write(data
)