From 4bce4546cbd70c8aab8ca81441010e0527ebbb07 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Fri, 22 Nov 2013 18:53:35 -0500
Subject: [PATCH] Greatly simplify the CommandLine module.

---
 src/CommandLine.hs | 48 +++++++++++++++++-----------------------------
 src/Main.hs        |  4 ++--
 2 files changed, 20 insertions(+), 32 deletions(-)

diff --git a/src/CommandLine.hs b/src/CommandLine.hs
index 405ded8..ad60c9f 100644
--- a/src/CommandLine.hs
+++ b/src/CommandLine.hs
@@ -1,19 +1,27 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 
-module CommandLine
+module CommandLine (
+  Args(..),
+  get_args )
 where
 
-import System.Console.CmdArgs
-import System.Console.CmdArgs.Explicit (process)
-import System.Environment (getArgs, withArgs)
-import System.Exit (ExitCode(..), exitWith)
-import System.IO (hPutStrLn, stderr)
+import System.Console.CmdArgs (
+  Data,
+  Typeable,
+  (&=),
+  cmdArgs,
+  def,
+  details,
+  help,
+  program,
+  summary,
+  typFile)
+
 
 -- Get the version from Cabal.
 import Paths_email_validator (version)
 import Data.Version (showVersion)
 
-import ExitCodes
 
 -- We optionally accept input/output files to use instead of
 -- stdin/stdout.
@@ -48,9 +56,8 @@ rfc5322_help :: String
 rfc5322_help =
   "Validate according to RFC 5322 (incredibly lenient)."
 
-arg_spec :: Mode (CmdArgs Args)
+arg_spec :: Args
 arg_spec =
-  cmdArgsMode $
     Args { accept_a    = def &=            help accept_a_help,
            input_file  = def &= typFile &= help input_file_help,
            output_file = def &= typFile &= help output_file_help,
@@ -59,26 +66,7 @@ arg_spec =
       &= summary my_summary
       &= details [description]
 
-show_help :: IO (CmdArgs Args)
-show_help = withArgs ["--help"] parse_args
-
-
-
-parse_args :: IO (CmdArgs Args)
-parse_args = do
-  x <- getArgs
-  let y = process arg_spec x
-  case y of
-    Right result -> return result
-    Left err -> do
-      hPutStrLn stderr err
-      exitWith (ExitFailure exit_args_parse_failed)
 
 
--- | Really get the command-line arguments. This calls 'parse_args'
---   first to replace the default "wrong number of arguments" error,
---   and then runs 'cmdArgsApply' on the result to do what the
---   'cmdArgs' function usually does.
-apply_args :: IO Args
-apply_args =
-  parse_args >>= cmdArgsApply
+get_args :: IO Args
+get_args = cmdArgs arg_spec
diff --git a/src/Main.hs b/src/Main.hs
index 0e7c30f..551dae7 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -34,7 +34,7 @@ import System.IO (
   stdout)
 
 
-import CommandLine (Args(..), apply_args)
+import CommandLine (Args(..), get_args)
 import EmailAddress
 import ExitCodes (exit_input_file_doesnt_exist)
 
@@ -103,7 +103,7 @@ validate resolver accept_a rfc5322 address = do
 
 main :: IO ()
 main = do
-  Args{..} <- apply_args
+  Args{..} <- get_args
 
   -- Get the input from either stdin, or the file given on the command
   -- line.
-- 
2.44.2