New option --mime

* mail/mail.c (mime_option): New variable.
(main): assume --mime if either or both of --content-type and
--content-encoding are set.  Set the mime variable if so.
* mail/mail.h (mailvar_is_true): New prototype.
* mail/send.c (add_attachments): Continue if the mime variable
is set.
(add_body): Rewrite, treating the text read from the stdin as
MIME part in itself.
* mailvar.c (mailvar_tab): New variable "mime"
(mailvar_is_true): New function.

* NEWS: Document --mime
* doc/texinfo/programs.texi: Rewrite the Attachments subsection.

1 files changed, 15 insertions, 1 deletions

diff --git a/NEWS b/NEWS
index f6fef0c7e..2c738989c 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,4 @@
-GNU mailutils NEWS -- history of user-visible changes. 2017-04-13
+GNU mailutils NEWS -- history of user-visible changes. 2017-04-19
 Copyright (C) 2002-2017 Free Software Foundation, Inc.
 See the end of file for copying conditions.
 
@@ -90,6 +90,20 @@ defined.  Instead, the following constants are defined in config.h:
 
 * mail: sending multipart messages
 
+** New option --mime
+
+This option instructs mail to compose output messages in MIME format.
+The options --content-type and --encoding turn this option on.  As a
+side effect, both --content-type and --encoding now affect the message
+body read from the standard input as well.
+
+** New variable 'mime'
+
+The 'mime' variable, if set instructs mail to compose output messages
+in MIME format.  In fact, the '--mime' option is equivalent to
+'-E set mime', except that it takes effect after all options are
+processed.
+
 ** New option --alternative
 
 When used with --attach or --attach-fd options, this option sets the