Rosetta Code/Rank languages by popularity

Sort most popular programming languages based in number of members in Rosetta Code categories (from http://www.rosettacode.org/w/index.php?title=Special:Categories&limit=500)

Output:

1. 246 - Programming_Tasks 
2. 203 - Python 
3. 201 - Ada 
4. 188 - OCaml 
5. 171 - Perl 
6. 169 - Java 
7. 168 - Haskell 
8. 157 - C 
9. 141 - Forth 
10. 140 - Ruby 
...

Filtering wrong results is optional. You can check against http://www.rosettacode.org/wiki/Special:MostLinkedCategories

Python

Works with: Python 2.6

<lang python>import urllib import re

def key1(x):

   return int(x.split()[0])

a = urllib.urlopen("http://www.rosettacode.org/w/index.php?title=Special:Categories&limit=500")

entries = []

for line in a:

   match = re.search('>([^<>]*)</a> \((\d+) members?\)', line)
   if match: entries.append(match.group(2) + ' - ' + match.group(1))

a.close()

for c, line in enumerate(sorted(entries, key=key1, reverse=True),start=1):

   print "%3d. %s" % (c, line)</lang>

Ruby

<lang ruby>require 'open-uri'

entries = []

open("http://www.rosettacode.org/w/index.php?title=Special:Categories&limit=500") do |f|

 for line in f
   match = line.match(%r{>([^<>]*)</a> \((\d+) members?\)})
   entries << match[2] + ' - ' + match[1] if match
 end

end

entries.sort_by {|x| -x.to_i}.each_with_index do |line, c|

 puts "%3d. %s" % [c+1, line]

end</lang>

UnixPipes

echo "GET http://www.rosettacode.org/w/index.php?title=Special:Categories&limit=500 HTTP/1.0\n\n" 
 | nc www.rosettacode.org 80 
 | sed -n -e 's,<[^>]*>,,g' -e's,^\([^(]*\)(\([^)]*\) members*) *,\2 - \1,g' -e'/^[0-9]\+./p'
 | sort -rn