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#!/usr/bin/env ruby
require 'set'
require 'fileutils'
common = ARGV.shift
targets = ARGV.dup
first, *rest = targets
files = targets.map do |dir|
Dir.chdir dir
g = Dir.glob("**/*").select { |file| test(?f, file) }
Dir.chdir ".."
puts "#{dir}: Found #{g.size} files"
Set.new(g)
end
commonfiles = files.inject(:&)
puts "#{commonfiles.size} common files"
samefiles = 0
commonfiles.each do |file|
firstfile = File.join first, file
targetfiles = rest.map { |target| File.join target, file }
is_same = targetfiles.all? do |targetfile|
system "diff", "-q", firstfile, targetfile,
in: "/dev/null", out: "/dev/null", err: [:child, :out]
end
if is_same
commonfile = File.join common, file
FileUtils.mkdir_p File.dirname(commonfile)
FileUtils.mv firstfile, commonfile
FileUtils.rm(targetfiles)
samefiles += 1
else
puts "Divergent common file: #{file}"
end
end
puts "#{common}: #{samefiles} identical common files"
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