Makes it possible to compile the project down to an executable

Author: dragonwasrobot

README.md

@@ -8,13 +8,17 @@ This project requires that you already have [elixir](http://elixir-lang.org/)
 and its build tool `mix` installed, this can be done with `brew install elixir`
 or similar.
 
-- Clone this repository: `[email protected]:dragonwasrobot/json-schema-to-elm.git`
-- Build a mix archive: `mix archive.build`
-- Install the archive: `mix archive.install js2e-1.0.0.ez`
+- Clone this repository: `git clone [email protected]:dragonwasrobot/json-schema-to-elm.git`
+- Compile the project: `MIX_ENV=prod mix deps.get && mix compile`
+- Build an executable: `MIX_ENV=prod mix escript.build`
+- An executable, `js2e`, has now been created in your current working directory.
+
+For further help, look up the documentation on how
+to [install escripts](https://hexdocs.pm/mix/Mix.Tasks.Escript.Install.html).
 
 ## Usage
 
-See `mix help elm.gen` for usage instructions.
+See `./js2e` for usage instructions.
 
 A proper description of which properties are mandatory are how the generator
 works is still in progress, but feel free to take a look at the `examples`

config/config.exs

@@ -1,3 +1,3 @@
 use Mix.Config
 
-config :logger, level: :info
+import_config "#{Mix.env}.exs"

config/dev.exs

@@ -0,0 +1,3 @@
+use Mix.Config
+
+config :logger, level: :debug

config/prod.exs

@@ -0,0 +1,3 @@
+use Mix.Config
+
+config :logger, level: :info

lib/js2e.ex

@@ -1,11 +1,108 @@
 defmodule JS2E do
   @moduledoc ~S"""
-  Parses JSON schemas and prints Elm types and decoders.
+  Transforms one or more JSON schema files into their corresponding
+  Elm types and JSON decoders.
+
+  Expects a PATH to one or more JSON schema files from which to generate
+  Elm code.
+
+      js2e PATH [--module-name NAME]
+
+  The JSON schema(s) at the given PATH will be converted to Elm types
+  and JSON decoders.
+
+  ## Options
+
+      * `--module-name` - the module name prefix for the printed Elm modules \
+      default value is 'Domain'.
   """
 
   require Logger
   alias JS2E.{Parser, Printer}
 
+  @spec main([String.t]) :: :ok
+  def main(args) do
+    Logger.debug "Arguments: #{inspect args}"
+
+    {options, paths, errors} =
+      OptionParser.parse(args, switches: [module_name: :string])
+
+    if length(paths) == 0 do
+      IO.puts @moduledoc
+      exit(:normal)
+    end
+
+    if length(errors) > 0 do
+      IO.puts "Error: Found one or more errors in the supplied options"
+      exit({:unknown_arguments, errors})
+    end
+
+    files = resolve_all_paths(paths)
+    Logger.debug "Files: #{inspect files}"
+
+    if length(files) == 0 do
+      IO.puts "Error: Could not find any JSON files in path: #{inspect paths}"
+      exit(:no_files)
+    end
+
+    output_path = create_output_dir(options)
+    JS2E.generate(files, output_path)
+  end
+
+  @spec resolve_all_paths([String.t]) :: [String.t]
+  defp resolve_all_paths(paths) do
+    paths
+    |> Enum.filter(&File.exists?/1)
+    |> Enum.reduce([], fn (filename, files) ->
+      cond do
+        File.dir? filename ->
+          walk_directory(filename) ++ files
+
+        String.ends_with?(filename, ".json") ->
+          [filename | files]
+
+        true ->
+          files
+      end
+    end)
+  end
+
+  @spec walk_directory(String.t) :: [String.t]
+  defp walk_directory(dir) do
+    dir
+    |> File.ls!
+    |> Enum.reduce([], fn file, files ->
+      filename = "#{dir}/#{file}"
+
+      cond do
+        File.dir? filename ->
+          walk_directory(filename) ++ files
+
+        String.ends_with?(file, ".json") ->
+          [filename | files]
+
+        true ->
+          files
+      end
+    end)
+  end
+
+  @spec create_output_dir(list) :: String.t
+  defp create_output_dir(options) do
+
+    output_path = if Keyword.has_key?(options, :module_name) do
+      Keyword.get(options, :module_name)
+    else
+      "Domain"
+    end
+
+    output_path
+    |> Path.join("Decoders")
+    |> File.mkdir_p!()
+
+    output_path
+  end
+
   @spec generate([String.t], String.t) :: :ok
   def generate(json_schema_paths, module_name) do
 

lib/mix/tasks/elm_gen.ex

@@ -9,6 +9,12 @@ defmodule JS2.Mixfile do
      build_embedded: Mix.env == :prod,
      start_permanent: Mix.env == :prod,
 
+     # Packaging
+     escript: [
+       main_module: JS2E,
+       name: "js2e"
+     ],
+
      # Dialyxir
      dialyzer: [plt_add_deps: :project],