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GraphQL for Elixir

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

defmodule Mix.Tasks.Absinthe.Schema.Graphql do

  require Logger

  use Mix.Task

  import Mix.Generator



  @shortdoc "Generate a schema.graphql (IDL) file for an Absinthe schema"



  @default_filename "./schema.graphql"

  @default_adapter Absinthe.Adapter.LanguageConventions

  @default_adapter_name "Absinthe.Adapter.LanguageConventions"



  @moduledoc """

  Generate a schema.graphql file



  ## Usage



      absinthe.schema.graphql [OPTIONS] [FILENAME]



  ## Options



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

      --adapter Sets the adapter. Default: #{@default_adapter_name}



  ## Examples



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

  the `:absinthe` application, adapting it using the default

  `#{@default_adapter_name}` adapter:



      $ mix absinthe.schema.graphql



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

  it using the default `#{@default_adapter_name}` adapter:



      $ mix absinthe.schema.graphql --schema MySchema



  Write to path `/path/to/schema.graphql` using the `MySchema` schema, adapting

  it using the default `#{@default_adapter_name}` adapter:



      $ mix absinthe.schema.graphql --schema MySchema /path/to/schema.graphql



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

  it using the `Absinthe.Adapter.Passthrough` adapter:



      $ mix absinthe.schema.graphql --schema MySchema --adapter Absinthe.Adapter.Passthrough



  """



  def run(argv) do

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



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



    adapter = find_adapter(opts)

    schema = find_schema(opts)

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



    content = schema

    |> Absinthe.Language.IDL.to_idl_ast

    |> adapter.dump_document

    |> Absinthe.Language.IDL.to_idl_iodata(schema)



    create_directory(Path.dirname(filename))

    create_file(filename, content, force: true)

  end



  defp find_adapter(opts) do

    Keyword.get(opts, :adapter, fallback_adapter)

    |> List.wrap

    |> Module.safe_concat

  end



  defp fallback_adapter do

    Application.get_env(:absinthe, :adapter) || @default_adapter

  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