From 38e7f88f670589e1ffd61083a0f551369ba96d98 Mon Sep 17 00:00:00 2001
From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Date: Sat, 2 Nov 2019 01:28:19 -0400
Subject: email-print-mime-structure: parse argments

This adds a -h and --help option, which is currently pretty useless.

But the argparse will become useful shortly.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
---
 email-print-mime-structure       | 9 ++++++++-
 email-print-mime-structure.1.pod | 9 ++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/email-print-mime-structure b/email-print-mime-structure
index 5eb94e0..38dc8d9 100755
--- a/email-print-mime-structure
+++ b/email-print-mime-structure
@@ -33,11 +33,15 @@ import sys
 import email
 import logging
 
+from argparse import ArgumentParser, Namespace
 from typing import Optional, Union, List, Tuple, Any
 from email.charset import Charset
 from email.message import Message
 
 class MimePrinter(object):
+    def __init__(self, args:Namespace):
+        self.args = args
+
     def print_part(self, z:Message, prefix:str) -> None:
         ofname:Optional[str] = z.get_filename()
         fname:str = '' if ofname is None else f' [{ofname}]'
@@ -81,10 +85,13 @@ class MimePrinter(object):
             self.print_part(z, prefix+'─╴')
 
 def main() -> None:
+    parser:ArgumentParser = ArgumentParser(description='Read RFC2822 MIME message from stdin and emit a tree diagram to stdout.',
+                                           epilog="Example: email-print-mime-structure < message.eml")
+    args:Namespace = parser.parse_args()
     msg:Union[Message, str, int, Any] = email.message_from_file(sys.stdin)
 
     if isinstance(msg, Message):
-        printer:MimePrinter = MimePrinter()
+        printer:MimePrinter = MimePrinter(args)
         printer.test(msg, '└')
     else:
         logging.error('Input was not an e-mail message')
diff --git a/email-print-mime-structure.1.pod b/email-print-mime-structure.1.pod
index ab1ec05..03a8e29 100644
--- a/email-print-mime-structure.1.pod
+++ b/email-print-mime-structure.1.pod
@@ -19,7 +19,14 @@ something like "cat -n".
 
 =head1 OPTIONS
 
-None.
+=over 4
+
+=item B<--help>, B<-h>
+
+Show usage instructions.
+
+=back
+
 
 =head1 EXAMPLE
 
-- 
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