fix-available.rb

#!/usr/bin/ruby

require 'set'

infos = IO.read('/var/lib/dpkg/available').split("\n\n")
to_delete = IO.popen("dpkg -l '*'") {|f| f.readlines.grep(/^un/).map {|l| l.split(/\s+/)[1]}}
to_delete = to_delete.map {|n| "Package: #{n}"}.to_set
new_infos = infos.reject do |entry|
  first_line = entry.split("\n", 2)[0]
  to_delete.include? first_line
end

STDOUT << new_infos.join("\n\n") << "\n\n"