Takes a file of USCF IDs and outputs a file of USCF ratings

USCF_Rating.rb

require 'open-uri'

# first argument: file containing uscf id numbers
# second argument: file you wish to write ratings to
if ARGV.length < 2 then return nil end

# gets unofficial rating
def get_rating(id)
	# opens page for corresponding to id number
	f = open("http://www.uschess.org/msa/MbrDtlTnmtHst.php?#{id}")
	
	# skips to relevant info and then grabs rating
	(0...118).each {|i| f.readline}
	rating = f.readline.scan(/<b>\d+/)[0].scan(/\d+/)[0].to_i
	f.close
	return rating
end

file_name = ARGV[0]

f = open(file_name, 'r')
g = open(ARGV[1], 'w')

f.each {|l|
	rating = get_rating(l)
	g.write("#{rating}\n")
}

f.close
g.close