#!/usr/bin/env ruby

require 'Newick'

if (ARGV.size != 1 && ARGV.size != 2)
  STDERR.printf("usage: %s tree-file [outgroup]\n", $0)
  exit(1)
end

treeFile, outgroup = ARGV

tree = NewickTree.fromFile(treeFile)

if (outgroup.nil?)
  print tree.midpointRoot.to_s + "\n"
else
  outNode = tree.findNode(outgroup)
  if (outNode.nil?)
    STDERR.printf("taxon #{outgroup} not found in tree!\n")
    exit(1)
  else
     print tree.reroot(outNode).to_s + "\n"
  end
end