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Composable Igniter tasks for bootstrapping Phoenix applications

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project lib mix tasks project remove topbar.ex
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lib/mix/tasks/project/remove/topbar.ex 

defmodule Mix.Tasks.Project.Remove.Topbar do

  @shortdoc "Removes topbar progress indicator"

  @moduledoc "Removes the topbar progress indicator."

  use Igniter.Mix.Task



  @impl Igniter.Mix.Task

  def igniter(igniter) do

    igniter

    |> Igniter.rm("assets/vendor/topbar.js")

    |> edit_app_js()

    |> edit_package_json()

  end



  defp edit_app_js(igniter) do

    Igniter.update_file(igniter, "assets/js/app.js", fn source ->

      source

      |> Rewrite.Source.get(:content)

      |> String.split("\n")

      |> Enum.reject(&String.contains?(&1, ["topbar", "progress bar"]))

      |> Enum.join("\n")

      |> then(&Regex.replace(~r/\n{3,}/, &1, "\n\n"))

      |> then(&Rewrite.Source.update(source, :content, &1))

    end)

  end



  defp edit_package_json(igniter) do

    if Igniter.exists?(igniter, "package.json") do

      Igniter.update_file(igniter, "package.json", fn source ->

        source

        |> Rewrite.Source.get(:content)

        |> Jason.decode!()

        |> Map.delete("topbar")

        |> Jason.encode!(pretty: true)

        |> then(&Rewrite.Source.update(source, :content, &1))

      end)

    else

      igniter

    end

  end

end