added mix neotoma task and mix.exs for elixir

.gitignore

@@ -1,5 +1,6 @@
 ebin/*.beam
 ebin/neotoma.app
+_build/
 extra/*.beam
 *#*
 .eunit

VERSION

@@ -0,0 +1 @@
+1.7.2

lib/mix/tasks/compile.neotoma.ex

@@ -0,0 +1,69 @@
+defmodule Mix.Tasks.Compile.Neotoma do
+  use Mix.Task
+  alias Mix.Compilers.Erlang
+
+  @recursive true
+  @manifest ".compile.peg"
+
+  @moduledoc """
+  Compile peg source files using Neotoma.
+
+  When this task runs, it will check the modification time of every file, and
+  if it has changed, the file will be compiled. Files will be
+  compiled in the same source directory with a .erl extension.
+  You can force compilation regardless of modification times by passing
+  the `--force` option.
+
+  ## Command line options
+
+    * `--force` - forces compilation regardless of modification times
+
+  ## Configuration
+
+    * `:erlc_paths` - directories to find source files. Defaults to `["src"]`.
+
+    * `:neotoma_options` - compilation options that apply
+      to Neooma's PEG compiler. There are many other available
+      options here: http://www.erlang.org/doc/man/yecc.html#file-1.
+
+  """
+
+  @doc """
+  Runs this task.
+  """
+  def run(args) do
+    {opts, _, _} = OptionParser.parse(args, switches: [force: :boolean])
+
+    project      = Mix.Project.config
+    source_paths = project[:erlc_paths]
+    mappings     = Enum.zip(source_paths, source_paths)
+    options      = project[:neotoma_options] || []
+
+    Erlang.compile(manifest(), mappings, :peg, :erl, opts[:force], fn
+      input, output ->
+        # Neotoma accepts the output dir, not the output filename
+        options = options ++ [output: Path.dirname(output)]
+
+        # Neotoma's file\1,2 functions' return value is adjusted for Erlang.compile/6
+        case :neotoma.file(Erlang.to_erl_file(input), options) do
+          :ok ->
+            {:ok, Path.basename(input, ".peg")}
+          {:error, _} ->
+            :error
+        end
+    end)
+  end
+
+  @doc """
+  Returns Peg manifests.
+  """
+  def manifests, do: [manifest]
+  defp manifest, do: Path.join(Mix.Project.manifest_path, @manifest)
+
+  @doc """
+  Cleans up compilation artifacts.
+  """
+  def clean do
+    Erlang.clean(manifest())
+  end
+end

mix.exs

@@ -0,0 +1,32 @@
+defmodule Neotoma.Mixfile do
+  use Mix.Project
+
+  @version File.read!("VERSION") |> String.strip
+
+  def project do
+    [app: :neotoma,
+     version: @version,
+     elixir: "~> 0.14",
+     package: package,
+     description: description
+    ]
+  end
+
+  def application do
+    [applications: []]
+  end
+
+  defp package do
+    [files: ~w(src lib mix.exs priv rebar.config README.textile LICENSE VERSION),
+     contributors: ["Sean Cribbs"],
+     licenses: ["MIT License"],
+     links: %{"GitHub" => "https://github.com/seancribbs/neotoma"}]
+  end
+
+  defp description do
+    """
+    Erlang library and packrat parser-generator for parsing expression grammars.
+    """
+  end
+
+end