uniq live!

uniq-live.rb

#!/usr/bin/ruby

# uniq-live
#
# Reads from stdin or a given file and counts the number of times a
# given line repeats as it is read.

last = nil
count = 1
while !ARGF.eof? && line = ARGF.readline.strip do
  if last == line
    count = count.next
    print "\r(#{count}) #{line}"
  else
    print "\n" if last
    print line
    last = line
    count = 1
  end
end

print "\n"