これは何 -> 今勉強用に作っているkwii名前のDLフレームワークのplot機能の実装です。動きません。どうして...

Doushite.jl

function plot(to_file = "graph.png")
  dot_graph =
  """
  digraph graph_name {
   hoge -> foo
  }
  """

  mktempdir() do tmp_dir
    dot_file_path = joinpath(tmp_dir, "tmp_graph.dot")

    open(dot_file_path, "w") do f
     write(f, dot_graph)
    end

    extension = last(split(to_file, "."))

    to_file = abspath(to_file)

    cmd = `dot $(dot_file_path) -T$(extension) -o $(to_file)`

    run(cmd)
  end
end