Add SQL Mix.Task.Compiler

Author: Schultzer

lib/mix/tasks/compile/sql.ex

@@ -0,0 +1,42 @@
+defmodule Mix.Tasks.Compile.Sql do
+  @moduledoc """
+  A SQL compiler for sql files.
+
+  You must add it to your `mix.exs` as:
+
+      compilers: [:sql] ++ Mix.compilers()
+
+  """
+  use Mix.Task.Compiler
+
+  @doc false
+  def run(_args) do
+    Mix.Task.Compiler.after_compiler(:elixir, fn
+      {:noop, diagnostics} ->
+        {:noop, diagnostics}
+      {status, diagnostics} ->
+        compile()
+        {status, diagnostics}
+    end)
+  end
+
+  def compile(files \\ files(), sql_files \\ [])
+  def compile([path|rest], sql_files) do
+    case {File.dir?(path), String.ends_with?(path, ".sql")} do
+      {true, false} -> compile(rest, compile(files(path), sql_files))
+      {false, true} -> compile(rest, [{path, do_compile(path)}|sql_files])
+      {false, false} -> compile(rest, sql_files)
+    end
+  end
+  def compile([], sql_files), do: sql_files
+
+  def do_compile(path) do
+    {:ok, context, tokens} = SQL.Lexer.lex(File.read!(path), path)
+    {:ok, context, tokens} = SQL.Parser.parse(tokens, context)
+    SQL.format(tokens, context, {nil, nil, 0, [file: Path.relative_to_cwd(path), line: 1]})
+  end
+
+  def files(path \\ File.cwd!) do
+    for file <- File.ls!(path), do: Path.join(path, file)
+  end
+end