filter ls(1) output for just the highest version of each RPM package

latest-rpm-filter.rb

#!/usr/bin/env ruby

# filter ls(1) output for just the highest version of each RPM package
# naively splits the filename into name / version on the first hyphen-followed-by-digit
# "tactical"

stash = {}
while l = gets
  l.chomp!
  begin
    n,v = l.match(/^([\w-]+)-(\d.*)$/)[1,2] # oh yeah baby
  rescue Exception
    STDERR.puts "Eh? #{l}"
  end
  stash[n] ||= []
  stash[n].push(v)
end

stash.each do |n, a|
  high = a.sort.last # alphasort, hmm
  STDERR.puts "#{n} #{high} (#{a.join(',')})"
  puts "#{n}-#{high}"
end