Prints out the duplicated classes found in the passed in jars...helpful finding library include problems in Android projects

find_duplicated_jars.rb

#!/usr/bin/env ruby
#
# Prints out the duplicated classes in jars
#
# Example:
#
#  find_duplicated_jars *.jar
#

class FindDuplicatedJars

  def initialize
    @verbose = false
    @print_classes = false
  end

  def post_process(classes2jars)
    #
    # Map group of jars to list of classes
    #
    jars2classes = {}
    classes2jars.each do |cls,jars|
      lst = jars2classes[jars] || []
      lst << cls
      jars2classes[jars] = lst
    end
    #
    # Print out the number of classes duplicated in each possible
    # combination of jar
    #
    jars2classes.each do |jars,classes|
      next if jars.size < 2
      STDOUT.printf "[%d] %-50s : %d\n",jars.size,jars.join(','),classes.size
      if @print_classes
        classes.sort.each do |cls|
          puts "  #{cls}"
        end
      end
    end
  end

  def note(str)
    return if not @verbose
    STDERR.puts str
    STDERR.flush
  end

  def process(classes2jars,jar)
    #
    # Map classes to list of jars in which they're found
    #
    note "Reading #{jar}..."
    IO.popen "jar tvf #{jar}" do |input|
      input.each do |line|
        line.scan /(\S+)\.class\s*/ do |res|
          cls = res[0]
          lst = classes2jars[cls] || []
          lst << jar
          classes2jars[cls] = lst
        end
      end
    end
  end
  
  def main(argv)
    @print_classes = false
    @verbose = false
    files = []
    argv.each do |arg|
      if arg =~ /-p/
        @print_classes = true
      elsif arg =~ /-v/
        @verbose = true
      else
        files << arg
      end
    end
    classes2jars = {}
    files.each do |f|
      process classes2jars,f
    end
    post_process classes2jars
  end
end

FindDuplicatedJars.new.main ARGV