#!/opt/local/bin/ruby

DARCS = '/usr/local/bin/darcs'

repos = ARGV[0]
code_root = ARGV[1] || '.'
tmp_dir   = "/tmp/#{File.basename(repos)}-tugger"


if File.exists? tmp_dir
  # Just get the count
  first_count = count = File.open("#{tmp_dir}/tugger-data", 'r').readlines.last.split(' ').first.to_i + 1
  puts "Restarting from change #{count}"
else
  # Need to initialize
  # Get the first patch
  first_patch = /  \* (.+)\n/.match(IO.popen("cd #{repos};#{DARCS} changes --reverse").readlines[1])[1]

  puts "Copying repository ..."
  %x{#{DARCS} get --to-patch="#{first_patch}" #{repos} #{tmp_dir}}
  first_count = count = 1
  puts "Beginning analysis ..."
end

Dir.chdir "#{tmp_dir}/#{code_root}"
f1 = File.open("#{tmp_dir}/tugger-data", 'a')
until %x{echo "yd" | #{DARCS} pull} =~ /No remote changes/
  if %x{rake stats} =~ /Code LOC:\s+(\d+)\s+Test LOC:\s+(\d+)/
    f1.write "#{count} #{$1} #{$2}\n"
  end
  puts "Wrote change #{count}"
  count = count + 1
end
f1.close

puts "Data completed for patches #{first_count} through #{count - 1}"