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excessibility

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Library for accessibility snapshot testing in Phoenix applications using axe-core and Playwright.

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excessibility lib mix tasks install.ex
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lib/mix/tasks/install.ex 

defmodule Mix.Tasks.Excessibility.Install do

  @shortdoc "Installs JavaScript dependencies needed for Excessibility (e.g. pa11y)"

  @moduledoc """

  Installs vendored JavaScript dependencies for Excessibility.



  This runs `npm install` in the ./assets/ directory to install `pa11y`.

  """



  use Mix.Task



  @impl true

  def run(_args) do

    dep_path = Mix.Project.deps_paths()[:excessibility] || File.cwd!()

    assets_dir = Path.join(dep_path, "assets")



    unless File.exists?(Path.join(assets_dir, "package.json")) do

      Mix.shell().error("""

      Could not find package.json inside Excessibility dependency at #{assets_dir}.



      You may need to check out the full repo or clone it locally.

      """)



      exit({:shutdown, 1})

    end



    Mix.shell().info("Installing npm packages in #{assets_dir}...")



    {_, exit_code} =

      System.cmd("npm", ["install"], cd: assets_dir, into: IO.stream(:stdio, :line))



    if exit_code == 0 do

      Mix.shell().info("✔ pa11y installed in vendored assets/")

    else

      Mix.shell().error("npm install failed")

      exit({:shutdown, 1})

    end

  end

end