gistfile1.txt

def git_group lines
  dirs = lines.select { |line| line[:name].count > 1 }
  files = (lines - dirs).map! { |file| [file.delete(:name).shift, file] }
  dirs_processed = dirs.group_by { |dir| dir[:name].shift }
                    .map { |key, value| [key, git_group(value)] }
  data = dirs_processed.concat(files)

  return {
    add: data.map { |k,l| l[:add] }.reduce(0, :+),
    del: data.map { |k,l| l[:del] }.reduce(0, :+),
    children: Hash[data]
  }
end

def to_git_diffnum_tree(txt)
  data = txt.split("\n")
    .map { |line| line.split() }
    .map { |line| {add: line[0].to_i, del: line[1].to_i, name: line[2].split('/')} }
    .sort_by { |item| item[:name] }

  git_group(data)[:children]
end