class Git::Lib

def commit_tree(tree, opts = {}) 

def commit_tree(tree, opts = {})
  opts[:message] ||= "commit tree #{tree}"
  t = Tempfile.new('commit-message')
  t.write(opts[:message])
  t.close
  
  arr_opts = []
  arr_opts << tree
  arr_opts << '-p' << opts[:parent] if opts[:parent]
  arr_opts += [opts[:parents]].map { |p| ['-p', p] }.flatten if opts[:parents]
  command('commit-tree', arr_opts, true, "< #{escape t.path}")
end