File management sample codes?

[OvermindDL1]

@elsatch

• List all the files in given directory
• For each file:
  a) Check if there is a folder with the same name as the file extension. If it doesn’t exist, create the folder.
  b) Check if there is a file with the same name as the current file in the extension directory. If it does exist, rename existing file adding _1 to the end of the name (or _2,_3) to prevent overwrites.
  c) Move file to its extension directory.

I’d probably do this:

  def sort_files(path) do
    files_by_dir =
      File.ls!(path)
      |> Enum.reject(&File.dir?/1)
      |> Enum.group_by(&Path.extname/1)

    Enum.each(files_by_dir, fn {"." <> ext, files} ->
      extpath = Path.join(path, ext)
      File.mkdir_p(extpath)

      Enum.each(files, fn file ->
        filepath = Path.join(extpath, file)
        # Keep only a max of 9, could easily make this unbounded though, but eh useful feature to add
        Enum.each(9..2, &File.rename("#{filepath}_#{&1-1}", "#{filepath}_#{&1}"))
        File.rename(filepath, "#{filepath}_1")
        File.rename!(Path.join(path, file), filepath)
      end)
    end)
  end

Could use some error reporting, but eh.