mail: provide mechanism for listing and editing attachments from the shell

* NEWS: Update.
* mail/escape.c (escape_check_args): Take two additional arguments
specifying minimum and maximum number of parameters to expect.
All uses updated. Remove static qualifier.
* mail/mail.h (send_attach_file): Rename to send_attach_file_default
(escape_check_args,escape_list_attachments)
(escape_attach,escape_remove_attachment): New protos.
* mail/send.c (send_attach_file): Take encoding and content type
as arguments.
(send_attach_file_default): New function.
(escape_list_attachments)
(escape_attach,escape_remove_attachment): New functions.
* mail/table.c: New escapes: l, +, ^

* include/mailutils/list.h (mu_list_remove_nth)
(mu_list_remove_nth_nd): New protos.
* libmailutils/list/Makefile.am (liblist_la_SOURCES): Add removenth.c
* libmailutils/list/removenth.c: New file.

1 files changed, 15 insertions, 1 deletions

diff --git a/NEWS b/NEWS
index 8cac522f0..7e55823c0 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,4 @@
-GNU mailutils NEWS -- history of user-visible changes. 2012-07-18
+GNU mailutils NEWS -- history of user-visible changes. 2012-07-19
 Copyright (C) 2002-2012 Free Software Foundation, Inc.
 See the end of file for copying conditions.
 
@@ -135,6 +135,20 @@ Here, the file "prog" will be attached witg the content type
 "main.c" and "ext.h" will be marked with content type "text/c" and
 encoded using "quoted-printable" algorithm.
 
+The mail shell provides the following new escapes to handle attachments:
+
+ ~l
+    Lists all attachments.  The output is a numbered list of
+    attachments with their corresponding content types and
+    encodings.
+    
+ ~+ filename [content-type [encoding]]
+    Attach the file `filename'.  Optional arguments supply the content
+    type and encoding to use instead of the defaults.
+
+ ~^ N
+    Delete Nth attachment.
+
 ** MH: improved compatibility with other implementations
 
 ** MH inc: new option --moveto