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absinthe

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absinthe lib mix tasks absinthe.schema.json.ex
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lib/mix/tasks/absinthe.schema.json.ex 

defmodule Mix.Tasks.Absinthe.Schema.Json do

  require Logger

  use Mix.Task

  import Mix.Generator



  @shortdoc "Generate a schema.json file for an Absinthe schema"



  @default_filename "./schema.json"

  @default_codec_name "Poison"



  @moduledoc """

  Generate a schema.json file



  ## Usage



      absinthe.schema.json [FILENAME] [OPTIONS]



  ## Options



      --schema The schema. Default: As configured for `:absinthe` `:schema`

      --json-codec Sets JSON Codec. Default: #{@default_codec_name}

      --pretty Whether to pretty-print. Default: false



  ## Examples



  Write to default path `#{@default_filename}` using the `:schema` configured for

  the `:absinthe` application and the default `#{@default_codec_name}` JSON codec:



      $ mix absinthe.schema.json



  Write to default path `#{@default_filename}` using the `MySchema` schema and

  the default `#{@default_codec_name}` JSON codec.



      $ mix absinthe.schema.json --schema MySchema



  Write to path `/path/to/schema.json` using the `MySchema` schema, using the

  default `#{@default_codec_name}` JSON codec, and pretty-printing:



      $ mix absinthe.schema.json --schema MySchema --pretty /path/to/schema.json



  Write to default path `#{@default_filename}` using the `MySchema` schema and

  a custom JSON codec, `MyCodec`:



      $ mix absinthe.schema.json --schema MySchema --json-codec MyCodec



  """



  @introspection_graphql Path.join([:code.priv_dir(:absinthe), "graphql", "introspection.graphql"])



  def run(argv) do

    Mix.Task.run("app.start", [])



    {opts, args, _} = OptionParser.parse(argv)



    schema = find_schema(opts)

    json_codec = find_json(opts)

    filename = args |> List.first || @default_filename



    {:ok, query} = File.read(@introspection_graphql)



    case Absinthe.run(query, schema) do

      {:ok, result} ->

        create_directory(Path.dirname(filename))

        content = json_codec.module.encode!(result, json_codec.opts)

        create_file(filename, content, force: true)

      {:error, error} ->

        raise error

    end

  end



  defp find_json(opts) do

    case Keyword.get(opts, :json_codec, Poison) do

      module when is_atom(module) ->

        %{module: module, opts: codec_opts(module, opts)}

      other ->

        other

    end

  end



  defp codec_opts(Poison, opts) do

    [pretty: Keyword.get(opts, :pretty, false)]

  end

  defp codec_opts(_, _) do

    []

  end



  defp find_schema(opts) do

    case Keyword.get(opts, :schema, Application.get_env(:absinthe, :schema)) do

      nil ->

        raise "No --schema given or :schema configured for the :absinthe application"

      value ->

        [value] |> Module.safe_concat

    end

  end



end