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;;; rmail.el --- main code of "RMAIL" mail reader for Emacs

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;; Copyright (C) 1985-1988, 1993-1998, 2000-2011
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;;   Free Software Foundation, Inc.

;; Maintainer: FSF
;; Keywords: mail

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;;; Code:

;; Souped up by shane@mit-ajax based on ideas of rlk@athena.mit.edu
;;   New features include attribute and keyword support, message
;;   selection by dispatch table, summary by attributes and keywords,
;;   expunging by dispatch table, sticky options for file commands.

;; Extended by Bob Weiner of Motorola
;;   New features include: rmail and rmail-summary buffers remain
;;   synchronized and key bindings basically operate the same way in both
;;   buffers, summary by topic or by regular expression, rmail-reply-prefix
;;   variable, and a bury rmail buffer (wipe) command.
;;

(require 'mail-utils)
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(require 'rfc2047)
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(defconst rmail-attribute-header "X-RMAIL-ATTRIBUTES"
  "The header that stores the Rmail attribute data.")

(defconst rmail-keyword-header "X-RMAIL-KEYWORDS"
  "The header that stores the Rmail keyword data.")

;;; Attribute indexes

(defconst rmail-answered-attr-index 0
  "The index for the `answered' attribute.")

(defconst rmail-deleted-attr-index 1
  "The index for the `deleted' attribute.")

(defconst rmail-edited-attr-index 2
  "The index for the `edited' attribute.")

(defconst rmail-filed-attr-index 3
  "The index for the `filed' attribute.")

(defconst rmail-retried-attr-index 4
  "The index for the `retried' attribute.")

(defconst rmail-forwarded-attr-index 5
  "The index for the `forwarded' attribute.")

(defconst rmail-unseen-attr-index 6
  "The index for the `unseen' attribute.")

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(defconst rmail-resent-attr-index 7
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  "The index for the `resent' attribute.")

(defconst rmail-attr-array
  '[(?A "answered")
    (?D "deleted")
    (?E "edited")
    (?F "filed")
    (?R "retried")
    (?S "forwarded")
    (?U "unseen")
    (?r "resent")]
  "An array that provides a mapping between an attribute index,
its character representation and its display representation.")

(defvar deleted-head)
(defvar font-lock-fontified)
(defvar mail-abbrev-syntax-table)
(defvar mail-abbrevs)
(defvar messages-head)
(defvar total-messages)
(defvar tool-bar-map)
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(defvar mail-encode-mml)
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(defvar rmail-header-style 'normal
  "The current header display style choice, one of
'normal (selected headers) or 'full (all headers).")

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;; rmail-spool-directory and rmail-file-name are defined in paths.el.
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(defgroup rmail nil
  "Mail reader for Emacs."
  :group 'mail)

(defgroup rmail-retrieve nil
  "Rmail retrieval options."
  :prefix "rmail-"
  :group 'rmail)

(defgroup rmail-files nil
  "Rmail files."
  :prefix "rmail-"
  :group 'rmail)

(defgroup rmail-headers nil
  "Rmail header options."
  :prefix "rmail-"
  :group 'rmail)

(defgroup rmail-reply nil
  "Rmail reply options."
  :prefix "rmail-"
  :group 'rmail)

(defgroup rmail-summary nil
  "Rmail summary options."
  :prefix "rmail-"
  :prefix "rmail-summary-"
  :group 'rmail)

(defgroup rmail-output nil
  "Output message to a file."
  :prefix "rmail-output-"
  :prefix "rmail-"
  :group 'rmail)

(defgroup rmail-edit nil
  "Rmail editing."
  :prefix "rmail-edit-"
  :group 'rmail)

(defcustom rmail-movemail-program nil
  "If non-nil, the file name of the `movemail' program."
  :group 'rmail-retrieve
  :type '(choice (const nil) string))

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(define-obsolete-variable-alias 'rmail-pop-password
  'rmail-remote-password "22.1")
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(defcustom rmail-remote-password nil
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  "Password to use when reading mail from a remote server.
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This setting is ignored for mailboxes whose URL already contains a password."
  :type '(choice (string :tag "Password")
		 (const :tag "Not Required" nil))
  :group 'rmail-retrieve
  :version "22.1")

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(define-obsolete-variable-alias 'rmail-pop-password-required
  'rmail-remote-password-required "22.1")

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(defcustom rmail-remote-password-required nil
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  "Non-nil if a password is required when reading mail from a remote server."
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  :type 'boolean
  :group 'rmail-retrieve
  :version "22.1")

(defcustom rmail-movemail-flags nil
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  "List of flags to pass to movemail.
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Most commonly used to specify `-g' to enable GSS-API authentication
or `-k' to enable Kerberos authentication."
  :type '(repeat string)
  :group 'rmail-retrieve
  :version "20.3")

(defvar rmail-remote-password-error "invalid usercode or password\\|
unknown user name or bad password\\|Authentication failed\\|MU_ERR_AUTH_FAILURE"
  "Regular expression matching incorrect-password POP or IMAP server error
messages.
If you get an incorrect-password error that this expression does not match,
please report it with \\[report-emacs-bug].")

(defvar rmail-encoded-remote-password nil)

(defcustom rmail-preserve-inbox nil
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  "Non-nil means leave incoming mail in the user's inbox--don't delete it."
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  :type 'boolean
  :group 'rmail-retrieve)

(defcustom rmail-movemail-search-path nil
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  "List of directories to search for movemail (in addition to `exec-path')."
  :group 'rmail-retrieve
  :type '(repeat (directory)))
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(declare-function mail-dont-reply-to "mail-utils" (destinations))
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(declare-function rmail-update-summary "rmailsum" (&rest ignore))
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(declare-function rmail-mime-toggle-hidden "rmailmm" ())
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(defun rmail-probe (prog)
  "Determine what flavor of movemail PROG is.
We do this by executing it with `--version' and analyzing its output."
  (with-temp-buffer
    (let ((tbuf (current-buffer)))
      (buffer-disable-undo tbuf)
      (call-process prog nil tbuf nil "--version")
      (if (not (buffer-modified-p tbuf))
	  ;; Should not happen...
	  nil
	(goto-char (point-min))
	(cond
	 ((looking-at ".*movemail: invalid option")
	  'emacs)    ;; Possibly...
	 ((looking-at "movemail (GNU Mailutils .*)")
	  'mailutils)
	 (t
	  ;; FIXME:
	  'emacs))))))

(defun rmail-autodetect ()
  "Determine the file name of the `movemail' program and return its flavor.
If `rmail-movemail-program' is non-nil, use it.
Otherwise, look for `movemail' in the directories in
`rmail-movemail-search-path', those in `exec-path', and `exec-directory'."
  (if rmail-movemail-program
      (rmail-probe rmail-movemail-program)
    (catch 'scan
      (dolist (dir (append rmail-movemail-search-path exec-path
			   (list exec-directory)))
	(when (and dir (file-accessible-directory-p dir))
	  ;; Previously, this didn't have to work on Windows, because
	  ;; rmail-insert-inbox-text before r1.439 fell back to using
	  ;; (expand-file-name "movemail" exec-directory) and just
	  ;; assuming it would work.
	  ;; http://lists.gnu.org/archive/html/bug-gnu-emacs/2008-02/msg00087.html
	  (let ((progname (expand-file-name
			   (concat "movemail"
				   (if (memq system-type '(ms-dos windows-nt))
				       ".exe")) dir)))
	    (when (and (not (file-directory-p progname))
		       (file-executable-p progname))
	      (let ((x (rmail-probe progname)))
		(when x
		  (setq rmail-movemail-program progname)
		  (throw 'scan x))))))))))

(defvar rmail-movemail-variant-in-use nil
  "The movemail variant currently in use. Known variants are:

  `emacs'     Means any implementation, compatible with the native Emacs one.
              This is the default;
  `mailutils' Means GNU mailutils implementation, capable of handling full
mail URLs as the source mailbox.")

;;;###autoload
(defun rmail-movemail-variant-p (&rest variants)
  "Return t if the current movemail variant is any of VARIANTS.
Currently known variants are 'emacs and 'mailutils."
  (when (not rmail-movemail-variant-in-use)
    ;; Autodetect
    (setq rmail-movemail-variant-in-use (rmail-autodetect)))
  (not (null (member rmail-movemail-variant-in-use variants))))

;; Call for effect, to set rmail-movemail-program (if not set by the
;; user), and rmail-movemail-variant-in-use. Used by various functions.
;; I'm not sure if M-x rmail is the only entry point to this package.
;; If so, this can be moved there.
(rmail-movemail-variant-p)

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;;;###autoload
(defcustom rmail-user-mail-address-regexp nil
  "Regexp matching user mail addresses.
If non-nil, this variable is used to identify the correspondent
when receiving new mail.  If it matches the address of the sender,
the recipient is taken as correspondent of a mail.
If nil \(default value\), your `user-login-name' and `user-mail-address'
are used to exclude yourself as correspondent.

Usually you don't have to set this variable, except if you collect mails
sent by you under different user names.
Then it should be a regexp matching your mail addresses.

Setting this variable has an effect only before reading a mail."
  :type '(choice (const :tag "None" nil) regexp)
  :group 'rmail-retrieve
  :version "21.1")

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;;;###autoload
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(defvaralias 'rmail-dont-reply-to-names 'mail-dont-reply-to-names)
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;;;###autoload
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(defvar rmail-default-dont-reply-to-names nil
  "Regexp specifying part of the default value of `mail-dont-reply-to-names'.
This is used when the user does not set `mail-dont-reply-to-names'
explicitly.")
;;;###autoload
(make-obsolete-variable 'rmail-default-dont-reply-to-names
                        'mail-dont-reply-to-names "24.1")
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;;;###autoload
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(defcustom rmail-ignored-headers
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  (purecopy
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  (concat "^via:\\|^mail-from:\\|^origin:\\|^references:\\|^sender:"
	  "\\|^status:\\|^received:\\|^x400-originator:\\|^x400-recipients:"
	  "\\|^x400-received:\\|^x400-mts-identifier:\\|^x400-content-type:"
	  "\\|^\\(resent-\\|\\)message-id:\\|^summary-line:\\|^resent-date:"
	  "\\|^nntp-posting-host:\\|^path:\\|^x-char.*:\\|^x-face:\\|^face:"
	  "\\|^x-mailer:\\|^delivered-to:\\|^lines:"
	  "\\|^content-transfer-encoding:\\|^x-coding-system:"
	  "\\|^return-path:\\|^errors-to:\\|^return-receipt-to:"
	  "\\|^precedence:\\|^mime-version:"
	  "\\|^list-owner:\\|^list-help:\\|^list-post:\\|^list-subscribe:"
	  "\\|^list-id:\\|^list-unsubscribe:\\|^list-archive:"
	  "\\|^content-length:\\|^nntp-posting-date:\\|^user-agent"
	  "\\|^importance:\\|^envelope-to:\\|^delivery-date\\|^openpgp:"
	  "\\|^mbox-line:\\|^cancel-lock:"
	  "\\|^DomainKey-Signature:\\|^dkim-signature:"
	  "\\|^resent-face:\\|^resent-x.*:\\|^resent-organization:\\|^resent-openpgp:"
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	  "\\|^x-.*:"))
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  "Regexp to match header fields that Rmail should normally hide.
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\(See also `rmail-nonignored-headers', which overrides this regexp.)
This variable is used for reformatting the message header,
which normally happens once for each message,
when you view the message for the first time in Rmail.
To make a change in this variable take effect
for a message that you have already viewed,
go to that message and type \\[rmail-toggle-header] twice."
  :type 'regexp
  :group 'rmail-headers)

(defcustom rmail-nonignored-headers "^x-spam-status:"
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  "Regexp to match X header fields that Rmail should show.
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This regexp overrides `rmail-ignored-headers'; if both this regexp
and that one match a certain header field, Rmail shows the field.
If this is nil, ignore all header fields in `rmail-ignored-headers'.

This variable is used for reformatting the message header,
which normally happens once for each message,
when you view the message for the first time in Rmail.
To make a change in this variable take effect
for a message that you have already viewed,
go to that message and type \\[rmail-toggle-header] twice."
  :type '(choice (const nil) (regexp))
  :group 'rmail-headers)

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;;;###autoload
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(defcustom rmail-displayed-headers nil
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  "Regexp to match Header fields that Rmail should display.
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If nil, display all header fields except those matched by
`rmail-ignored-headers'."
  :type '(choice regexp (const :tag "All"))
  :group 'rmail-headers)

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;;;###autoload
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(defcustom rmail-retry-ignored-headers (purecopy "^x-authentication-warning:\\|^x-detected-operating-system:\\|^x-spam[-a-z]*:\\|content-type:\\|content-transfer-encoding:\\|mime-version:\\|message-id:")
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  "Headers that should be stripped when retrying a failed message."
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  :type '(choice regexp (const nil :tag "None"))
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  :group 'rmail-headers
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  :version "23.2")	   ; added x-detected-operating-system, x-spam
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;;;###autoload
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(defcustom rmail-highlighted-headers (purecopy "^From:\\|^Subject:")
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  "Regexp to match Header fields that Rmail should normally highlight.
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A value of nil means don't highlight.  Uses the face `rmail-highlight'."
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  :type 'regexp
  :group 'rmail-headers)

(defface rmail-highlight
  '((t (:inherit highlight)))
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  "Face to use for highlighting the most important header fields.
The variable `rmail-highlighted-headers' specifies which headers."
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  :group 'rmail-headers
  :version "22.1")

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;; This was removed in Emacs 23.1 with no notification, an unnecessary
;; incompatible change.
(defcustom rmail-highlight-face 'rmail-highlight
  "Face used by Rmail for highlighting headers."
  ;; Note that nil doesn't actually mean use the default face, it
  ;; means use either bold or highlight. It's not worth fixing this
  ;; now that this is obsolete.
  :type '(choice (const :tag "Default" nil)
		 face)
  :group 'rmail-headers)
(make-obsolete-variable 'rmail-highlight-face
			"customize the face `rmail-highlight' instead."
			"23.2")

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(defface rmail-header-name
  '((t (:inherit font-lock-function-name-face)))
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  "Face to use for highlighting the header names.
The variable `rmail-font-lock-keywords' specifies which headers
get highlighted."
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  :group 'rmail-headers
  :version "23.1")

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(defcustom rmail-delete-after-output nil
  "Non-nil means automatically delete a message that is copied to a file."
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  :type 'boolean
  :group 'rmail-files)

;;;###autoload
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(defcustom rmail-primary-inbox-list nil
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  "List of files that are inboxes for your primary mail file `rmail-file-name'.
If this is nil, uses the environment variable MAIL.  If that is
unset, uses a file named by the function `user-login-name' in the
directory `rmail-spool-directory' (whose value depends on the
operating system).  For example, \"/var/mail/USER\"."
  ;; Don't use backquote here, because we don't want to need it at load time.
  ;; (That must be an old comment - it's dumped these days.)
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  :type (list 'choice '(const :tag "Default" nil)
	      (list 'repeat ':value (list (or (getenv "MAIL")
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					      (concat rmail-spool-directory
						      (user-login-name))))
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		    'file))
  :group 'rmail-retrieve
  :group 'rmail-files)

(defcustom rmail-mail-new-frame nil
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  "Non-nil means Rmail makes a new frame for composing outgoing mail.
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This is handy if you want to preserve the window configuration of
the frame where you have the RMAIL buffer displayed."
  :type 'boolean
  :group 'rmail-reply)

;;;###autoload
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(defcustom rmail-secondary-file-directory (purecopy "~/")
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  "Directory for additional secondary Rmail files."
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  :type 'directory
  :group 'rmail-files)
;;;###autoload
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(defcustom rmail-secondary-file-regexp (purecopy "\\.xmail$")
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  "Regexp for which files are secondary Rmail files."
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  :type 'regexp
  :group 'rmail-files)

(defcustom rmail-confirm-expunge 'y-or-n-p
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  "Whether and how to ask for confirmation before expunging deleted messages.
The value, if non-nil is a function to call with a question (string)
as argument, to ask the user that question."
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  :type '(choice (const :tag "No confirmation" nil)
		 (const :tag "Confirm with y-or-n-p" y-or-n-p)
		 (const :tag "Confirm with yes-or-no-p" yes-or-no-p))
  :version "21.1"
  :group 'rmail-files)
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(put 'rmail-confirm-expunge 'risky-local-variable t)
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;;;###autoload
(defvar rmail-mode-hook nil
  "List of functions to call when Rmail is invoked.")

(defvar rmail-get-new-mail-hook nil
  "List of functions to call when Rmail has retrieved new mail.")

;;;###autoload
(defcustom rmail-show-message-hook nil
  "List of functions to call when Rmail displays a message."
  :type 'hook
  :options '(goto-address)
  :group 'rmail)

(defvar rmail-quit-hook nil
  "List of functions to call when quitting out of Rmail.")

(defvar rmail-delete-message-hook nil
  "List of functions to call when Rmail deletes a message.
When the hooks are called, the message has been marked deleted but is
still the current message in the Rmail buffer.")

;; These may be altered by site-init.el to match the format of mmdf files
;;  delimiting used on a given host (delim1 and delim2 from the config
;;  files).

(defvar rmail-mmdf-delim1 "^\001\001\001\001\n"
  "Regexp marking the start of an mmdf message.")
(defvar rmail-mmdf-delim2 "^\001\001\001\001\n"
  "Regexp marking the end of an mmdf message.")

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;; FIXME Post-mbox, this is now unused.
;; In Emacs-22, this was called:
;;  i) the very first time a message was shown.
;; ii) when toggling the headers to the normal state, every time.
;; It's not clear what it should do now, since there is nothing that
;; records when a message is shown for the first time (unseen is not
;; necessarily the same thing).
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(defcustom rmail-message-filter nil
  "If non-nil, a filter function for new messages in RMAIL.
Called with region narrowed to the message, including headers,
before obeying `rmail-ignored-headers'."
  :group 'rmail-headers
  :type '(choice (const nil) function))

(defcustom rmail-automatic-folder-directives nil
  "List of directives specifying where to put a message.
Each element of the list is of the form:

  (FOLDERNAME FIELD REGEXP [ FIELD REGEXP ] ... )

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Where FOLDERNAME is the name of a folder to put the message.
If any of the field regexp's are nil, then it is ignored.
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If FOLDERNAME is \"/dev/null\", it is deleted.
If FOLDERNAME is nil then it is deleted, and skipped.

FIELD is the plain text name of a field in the message, such as
\"subject\" or \"from\".  A FIELD of \"to\" will automatically include
all text from the \"cc\" field as well.

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REGEXP is an expression to match in the preceding specified FIELD.
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FIELD/REGEXP pairs continue in the list.

examples:
  (\"/dev/null\" \"from\" \"@spam.com\") ; delete all mail from spam.com
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  (\"RMS\" \"from\" \"rms@\") ; save all mail from RMS.

Note that this is only applied in the folder specifed by `rmail-file-name'."
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  :group 'rmail
  :version "21.1"
  :type '(repeat (sexp :tag "Directive")))

(defvar rmail-reply-prefix "Re: "
  "String to prepend to Subject line when replying to a message.")

;; Some mailers use "Re(2):" or "Re^2:" or "Re: Re:" or "Re[2]:".
;; This pattern should catch all the common variants.
;; rms: I deleted the change to delete tags in square brackets
;; because they mess up RT tags.
(defvar rmail-reply-regexp "\\`\\(Re\\(([0-9]+)\\|\\[[0-9]+\\]\\|\\^[0-9]+\\)?: *\\)*"
  "Regexp to delete from Subject line before inserting `rmail-reply-prefix'.")

(defcustom rmail-display-summary nil
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  "If non-nil, Rmail always displays the summary buffer."
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  :group 'rmail-summary
  :type 'boolean)

(defvar rmail-inbox-list nil)
(put 'rmail-inbox-list 'permanent-local t)

(defvar rmail-buffer nil
  "The RMAIL buffer related to the current buffer.
In an RMAIL buffer, this holds the RMAIL buffer itself.
In a summary buffer, this holds the RMAIL buffer it is a summary for.")
(put 'rmail-buffer 'permanent-local t)

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(defvar rmail-was-converted nil
  "Non-nil in an Rmail buffer that was just converted from Babyl format.")
(put 'rmail-was-converted 'permanent-local t)

(defvar rmail-seriously-modified nil
  "Non-nil in an Rmail buffer that has been modified in a major way.")
(put 'rmail-seriously-modified 'permanent-local t)

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;; Message counters and markers.  Deleted flags.

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(defvar rmail-current-message nil
  "Integer specifying the message currently being displayed in this folder.")
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(put 'rmail-current-message 'permanent-local t)

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(defvar rmail-total-messages nil
  "Integer specifying the total number of messages in this folder.
Includes deleted messages.")
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(put 'rmail-total-messages 'permanent-local t)

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(defvar rmail-message-vector nil
  "Vector of markers specifying the start and end of each message.
Element N and N+1 specify the start and end of message N.")
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(put 'rmail-message-vector 'permanent-local t)

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(defvar rmail-deleted-vector nil
  "A string of length `rmail-total-messages' plus one.
Character N is either a space or \"D\", according to whether
message N is deleted or not.")
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(put 'rmail-deleted-vector 'permanent-local t)

(defvar rmail-msgref-vector nil
  "In an Rmail buffer, a vector whose Nth element is a list (N).
When expunging renumbers messages, these lists are modified
by substituting the new message number into the existing list.")
(put 'rmail-msgref-vector 'permanent-local t)

(defvar rmail-overlay-list nil)
(put 'rmail-overlay-list 'permanent-local t)

;; These are used by autoloaded rmail-summary.

(defvar rmail-summary-buffer nil)
(put 'rmail-summary-buffer 'permanent-local t)
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(defvar rmail-summary-vector nil
  "In an Rmail buffer, vector of (newline-terminated) strings.
Element N specifies the summary line for message N+1.")
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(put 'rmail-summary-vector 'permanent-local t)

;; Rmail buffer swapping variables.

(defvar rmail-buffer-swapped nil
  "If non-nil, `rmail-buffer' is swapped with `rmail-view-buffer'.")
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(make-variable-buffer-local 'rmail-buffer-swapped)
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(put 'rmail-buffer-swapped 'permanent-local t)
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(defvar rmail-view-buffer nil
  "Buffer which holds RMAIL message for MIME displaying.")
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(make-variable-buffer-local 'rmail-view-buffer)
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(put 'rmail-view-buffer 'permanent-local t)

;; `Sticky' default variables.

;; Last individual label specified to a or k.
(defvar rmail-last-label nil)

;; Last set of values specified to C-M-n, C-M-p, C-M-s or C-M-l.
(defvar rmail-last-multi-labels nil)

(defvar rmail-last-regexp nil)
(put 'rmail-last-regexp 'permanent-local t)

(defcustom rmail-default-file "~/xmail"
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  "Default file name for \\[rmail-output]."
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  :type 'file
  :group 'rmail-files)
(defcustom rmail-default-body-file "~/mailout"
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  "Default file name for \\[rmail-output-body-to-file]."
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  :type 'file
  :group 'rmail-files
  :version "20.3")

;; Mule and MIME related variables.

;;;###autoload
(defvar rmail-file-coding-system nil
  "Coding system used in RMAIL file.

This is set to nil by default.")

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(defcustom rmail-enable-mime t
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  "If non-nil, RMAIL automatically displays decoded MIME messages.
For this to work, the feature specified by `rmail-mime-feature' must
be available."
  :type 'boolean
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  :version "23.3"
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  :group 'rmail)

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(defcustom rmail-enable-mime-composing t
  "If non-nil, use `rmail-insert-mime-forwarded-message-function' to forward."
  :type 'boolean
  :version "24.1"			; nil -> t
  :group 'rmail)
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(defvar rmail-show-mime-function nil
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  "Function of no argument called to show a decoded MIME message.
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This function is called when `rmail-enable-mime' is non-nil.
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The package providing MIME support should set this.")
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;;;###autoload
(defvar rmail-insert-mime-forwarded-message-function nil
  "Function to insert a message in MIME format so it can be forwarded.
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This function is called if `rmail-enable-mime' and
`rmail-enable-mime-composing' are non-nil.
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It is called with one argument FORWARD-BUFFER, which is a
buffer containing the message to forward.  The current buffer
is the outgoing mail buffer.")

(defvar rmail-insert-mime-resent-message-function nil
  "Function to insert a message in MIME format so it can be resent.
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This function is called by `rmail-resend' if `rmail-enable-mime' is non-nil.
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It is called with one argument FORWARD-BUFFER, which is a
buffer containing the message to forward.  The current buffer
is the outgoing mail buffer.")

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;; FIXME one might want to pass a LIMIT, as per
;; rmail-search-mime-header-function.
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(defvar rmail-search-mime-message-function nil
  "Function to check if a regexp matches a MIME message.
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This function is called by `rmail-search-message' if
`rmail-enable-mime' is non-nil.  It is called (with point at the
start of the message) with two arguments MSG and REGEXP, where
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MSG is the message number, REGEXP is the regular expression.")

(defvar rmail-search-mime-header-function nil
  "Function to check if a regexp matches a header of MIME message.
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This function is called by `rmail-message-regexp-p-1' if
`rmail-enable-mime' is non-nil.  It is called (with point at the
start of the header) with three arguments MSG, REGEXP, and LIMIT,
where MSG is the message number, REGEXP is the regular
expression, LIMIT is the position specifying the end of header.")
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(defvar rmail-mime-feature 'rmailmm
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  "Feature to require for MIME support in Rmail.
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When starting Rmail, if `rmail-enable-mime' is non-nil, this
feature is loaded with `require'.  The default value is `rmailmm'.
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The library should set the variable `rmail-show-mime-function'
to an appropriate value, and optionally also set
`rmail-search-mime-message-function',
`rmail-search-mime-header-function',
`rmail-insert-mime-forwarded-message-function', and
`rmail-insert-mime-resent-message-function'.")
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;; FIXME this is unused since 23.1.
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(defvar rmail-decode-mime-charset t
  "*Non-nil means a message is decoded by MIME's charset specification.
If this variable is nil, or the message has not MIME specification,
the message is decoded as normal way.

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If the variable `rmail-enable-mime' is non-nil, this variable is
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ignored, and all the decoding work is done by a feature specified by
the variable `rmail-mime-feature'.")

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(make-obsolete-variable 'rmail-decode-mime-charset
			"it does nothing." "23.1")

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(defvar rmail-mime-charset-pattern
  (concat "^content-type:[ \t]*text/plain;"
	  "\\(?:[ \t\n]*\\(?:format\\|delsp\\)=\"?[-a-z0-9]+\"?;\\)*"
	  "[ \t\n]*charset=\"?\\([^ \t\n\";]+\\)\"?")
  "Regexp to match MIME-charset specification in a header of message.
The first parenthesized expression should match the MIME-charset name.")


(defvar rmail-unix-mail-delimiter
  (let ((time-zone-regexp
	 (concat "\\([A-Z]?[A-Z]?[A-Z][A-Z]\\( DST\\)?"
		 "\\|[-+]?[0-9][0-9][0-9][0-9]"
		 "\\|"
		 "\\) *")))
    (concat
     "From "

     ;; Many things can happen to an RFC 822 mailbox before it is put into
     ;; a `From' line.  The leading phrase can be stripped, e.g.
     ;; `Joe <@w.x:joe@y.z>' -> `<@w.x:joe@y.z>'.  The <> can be stripped, e.g.
     ;; `<@x.y:joe@y.z>' -> `@x.y:joe@y.z'.  Everything starting with a CRLF
     ;; can be removed, e.g.
     ;;		From: joe@y.z (Joe	K
     ;;			User)
     ;; can yield `From joe@y.z (Joe 	K Fri Mar 22 08:11:15 1996', and
     ;;		From: Joe User
     ;;			<joe@y.z>
     ;; can yield `From Joe User Fri Mar 22 08:11:15 1996'.
     ;; The mailbox can be removed or be replaced by white space, e.g.
     ;;		From: "Joe User"{space}{tab}
     ;;			<joe@y.z>
     ;; can yield `From {space}{tab} Fri Mar 22 08:11:15 1996',
     ;; where {space} and {tab} represent the Ascii space and tab characters.
     ;; We want to match the results of any of these manglings.
     ;; The following regexp rejects names whose first characters are
     ;; obviously bogus, but after that anything goes.
     "\\([^\0-\b\n-\r\^?].*\\)? "

     ;; The time the message was sent.
     "\\([^\0-\r \^?]+\\) +"				; day of the week
     "\\([^\0-\r \^?]+\\) +"				; month
     "\\([0-3]?[0-9]\\) +"				; day of month
     "\\([0-2][0-9]:[0-5][0-9]\\(:[0-6][0-9]\\)?\\) *"	; time of day

     ;; Perhaps a time zone, specified by an abbreviation, or by a
     ;; numeric offset.
     time-zone-regexp

     ;; The year.
     " \\([0-9][0-9]+\\) *"

     ;; On some systems the time zone can appear after the year, too.
     time-zone-regexp

     ;; Old uucp cruft.
     "\\(remote from .*\\)?"

     "\n"))
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  "Regexp matching the delimiter of messages in UNIX mail format
\(UNIX From lines), minus the initial ^.  Note that if you change
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this expression, you must change the code in `rmail-nuke-pinhead-header'
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that knows the exact ordering of the \\( \\) subexpressions.")
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;; FIXME the rmail-header-name headers ought to be customizable.
;; It seems a bit arbitrary, for example, that all of the Date: line
;; gets highlighted.
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(defvar rmail-font-lock-keywords
  ;; These are all matched case-insensitively.
  (eval-when-compile
    (let* ((cite-chars "[>|}]")
	   (cite-prefix "a-z")
	   (cite-suffix (concat cite-prefix "0-9_.@-`'\"")))
      (list '("^\\(From\\|Sender\\|Resent-From\\):"
	      . 'rmail-header-name)
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	    '("^\\(Mail-\\)?Reply-To:.*$" . 'rmail-header-name)
	    ;; FIXME Mail-Followup-To should probably be here too.
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	    '("^Subject:" . 'rmail-header-name)
	    '("^X-Spam-Status:" . 'rmail-header-name)
	    '("^\\(To\\|Apparently-To\\|Cc\\|Newsgroups\\):"
	      . 'rmail-header-name)
	    ;; Use MATCH-ANCHORED to effectively anchor the regexp left side.
	    `(,cite-chars
	      (,(concat "\\=[ \t]*"
			"\\(\\(\\([" cite-prefix "]+[" cite-suffix "]*\\)?"
			"\\(" cite-chars "[ \t]*\\)\\)+\\)"
			"\\(.*\\)")
	       (beginning-of-line) (end-of-line)
	       (1 font-lock-comment-delimiter-face nil t)
	       (5 font-lock-comment-face nil t)))
	    '("^\\(X-[a-z0-9-]+\\|In-reply-to\\|Date\\):.*\\(\n[ \t]+.*\\)*$"
	      . 'rmail-header-name))))
  "Additional expressions to highlight in Rmail mode.")

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;; Rmail does not expect horizontal splitting.  (Bug#2282)
(defun rmail-pop-to-buffer (&rest args)
  "Like `pop-to-buffer', but with `split-width-threshold' set to nil."
  (let (split-width-threshold)
    (apply 'pop-to-buffer args)))

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;; Perform BODY in the summary buffer
;; in such a way that its cursor is properly updated in its own window.
(defmacro rmail-select-summary (&rest body)
  `(let ((total rmail-total-messages))
     (if (rmail-summary-displayed)
	 (let ((window (selected-window)))
	   (save-excursion
	     (unwind-protect
		 (progn
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		   (rmail-pop-to-buffer rmail-summary-buffer)
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		   ;; rmail-total-messages is a buffer-local var
		   ;; in the rmail buffer.
		   ;; This way we make it available for the body
		   ;; even tho the rmail buffer is not current.
		   (let ((rmail-total-messages total))
		     ,@body))
	       (select-window window))))
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       (with-current-buffer rmail-summary-buffer
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	 (let ((rmail-total-messages total))
	   ,@body)))
     (rmail-maybe-display-summary)))

;;;; *** Rmail Mode ***

(defun rmail-require-mime-maybe ()
  "Require `rmail-mime-feature' if that is non-nil.
Signal an error and set `rmail-mime-feature' to nil if the feature
isn't provided."
  (when rmail-enable-mime
    (condition-case err
	(require rmail-mime-feature)
      (error
       (display-warning
	'rmail
	(format "Although MIME support is requested
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through `rmail-enable-mime' being non-nil, the required feature
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`%s' (the value of `rmail-mime-feature')
is not available in the current session.
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So, MIME support is turned off for the moment."
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		rmail-mime-feature)
	:warning)
       (setq rmail-enable-mime nil)))))


;;;###autoload
(defun rmail (&optional file-name-arg)
  "Read and edit incoming mail.
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Moves messages into file named by `rmail-file-name' and edits that
file in RMAIL Mode.
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Type \\[describe-mode] once editing that file, for a list of RMAIL commands.

May be called with file name as argument; then performs rmail editing on
that file, but does not copy any new mail into the file.
Interactively, if you supply a prefix argument, then you
have a chance to specify a file name with the minibuffer.

If `rmail-display-summary' is non-nil, make a summary for this RMAIL file."
  (interactive (if current-prefix-arg
		   (list (read-file-name "Run rmail on RMAIL file: "))))
  (rmail-require-mime-maybe)
  (let* ((file-name (expand-file-name (or file-name-arg rmail-file-name)))
	 ;; Use find-buffer-visiting, not get-file-buffer, for those users
	 ;; who have find-file-visit-truename set to t.
	 (existed (find-buffer-visiting file-name))
	 run-mail-hook mail-buf msg-shown)
    ;; Determine if an existing mail file has been changed behind the
    ;; scene...
    (if (and existed (not (verify-visited-file-modtime existed)))
	;; The mail file has been changed.  Revisit it and reset the
	;; message state variables when in rmail mode.
	(progn
	  (find-file file-name)
	  (when (and (verify-visited-file-modtime existed)
		     (eq major-mode 'rmail-mode))
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	    (rmail-swap-buffers-maybe)
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	    (rmail-set-message-counters)))
      ;; The mail file is either unchanged or not visited.  Visit it.
      (switch-to-buffer
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       (let ((enable-local-variables nil)
	     ;; Force no-conversion by default, since that's what
	     ;; pre-mbox Rmail did with BABYL files (via
	     ;; auto-coding-regexp-alist).
	     (coding-system-for-read
	      (or coding-system-for-read 'no-conversion)))
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	 (find-file-noselect file-name))))
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    ;; Ensure that the collection and view buffers are in sync and
    ;; ensure that a message is not being edited.
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    (if (eq major-mode 'rmail-mode)
	(rmail-swap-buffers-maybe))
    (if (eq major-mode 'rmail-edit-mode)
	(error "Exit Rmail Edit mode before getting new mail"))
    (or (and existed (> (buffer-size) 0))
	(setq run-mail-hook t))
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    ;; Ensure that the Rmail file is in mbox format, the buffer is in
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    ;; Rmail mode and has been scanned to find all the messages
    ;; (setting the global message variables in the process).
    (rmail-convert-file-maybe)
    (unless (eq major-mode 'rmail-mode)
      (rmail-mode-2))
    (goto-char (point-max))
    (rmail-maybe-set-message-counters)
    (setq mail-buf rmail-buffer)
    ;; Show the first unread message and process summary mode.
    (unwind-protect
	;; Only get new mail when there is not a file name argument.
	(unless file-name-arg
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	  (setq msg-shown (rmail-get-new-mail)))
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      (progn
	(set-buffer mail-buf)
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	(or msg-shown
	    (rmail-show-message (rmail-first-unseen-message)))
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	(if rmail-display-summary (rmail-summary))
	(rmail-construct-io-menu)
	(if run-mail-hook
	    (run-hooks 'rmail-mode-hook))))))

(defun rmail-convert-file-maybe ()
  "Determine if the file needs to be converted to mbox format."
  (widen)
  (goto-char (point-min))
  ;; Detect previous Babyl format files.
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  (let ((case-fold-search nil))
    (cond ((looking-at "BABYL OPTIONS:")
	   ;; The file is Babyl version 5.  Use unrmail to convert
	   ;; it.
	   (rmail-convert-babyl-to-mbox))
	  ((looking-at "Version: 5\n")
	   ;; Losing babyl file made by old version of Rmail.  Fix the
	   ;; babyl file header and use unrmail to convert to mbox
	   ;; format.
	   (let ((buffer-read-only nil))
	     (insert "BABYL OPTIONS: -*- rmail -*-\n")
	     (rmail-convert-babyl-to-mbox)))
	  ((equal (point-min) (point-max))
	   (message "Empty Rmail file."))
	  ((looking-at "From "))
	  (t (error "Invalid mbox file")))))
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(defun rmail-error-bad-format (&optional msgnum)
  "Report that the buffer is not in the mbox file format.
MSGNUM, if present, indicates the malformed message."
  (if msgnum
      (error "Message %d is not a valid RFC2822 message" msgnum)
    (error "Message is not a valid RFC2822 message")))

(defun rmail-convert-babyl-to-mbox ()
  "Convert the mail file from Babyl version 5 to mbox.
This function also reinitializes local variables used by Rmail."
  (let ((old-file (make-temp-file "rmail"))
	(new-file (make-temp-file "rmail")))
    (unwind-protect
	(progn
	  (kill-all-local-variables)
	  (write-region (point-min) (point-max) old-file)
	  (unrmail old-file new-file)
	  (message "Replacing BABYL format with mbox format...")
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	  (let ((inhibit-read-only t)
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		(coding-system-for-read 'raw-text)
		(buffer-undo-list t))
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	    (erase-buffer)
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	    (insert-file-contents new-file)
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	    ;; Rmail buffers need to be saved with Unix EOLs, or else
	    ;; the format will not be recognized.
	    (set-buffer-file-coding-system 'raw-text-unix)
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	    (rmail-mode-1)
	    (rmail-perm-variables)
	    (rmail-variables)
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	    (setq rmail-was-converted t)
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	    (rmail-dont-modify-format)
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	    (goto-char (point-max))
	    (rmail-set-message-counters))
	  (message "Replacing BABYL format with mbox format...done"))
      (delete-file old-file)
      (delete-file new-file))))

(defun rmail-get-coding-system ()
  "Return a suitable coding system to use for the current mail message.
The buffer is expected to be narrowed to just the header of the message."
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  (save-excursion
    (goto-char (point-min))
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    (if (re-search-forward rmail-mime-charset-pattern nil t)
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	(coding-system-from-name (match-string 1))
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      'undecided)))

;;; Set up Rmail mode keymaps

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(defvar rmail-mode-map
  (let ((map (make-keymap)))
    (suppress-keymap map)
    (define-key map "a"      'rmail-add-label)
    (define-key map "b"      'rmail-bury)
    (define-key map "c"      'rmail-continue)
    (define-key map "d"      'rmail-delete-forward)
    (define-key map "\C-d"   'rmail-delete-backward)
    (define-key map "e"      'rmail-edit-current-message)
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    ;; If you change this, change the rmail-resend menu-item's :keys.
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    (define-key map "f"      'rmail-forward)
    (define-key map "g"      'rmail-get-new-mail)
    (define-key map "h"      'rmail-summary)
    (define-key map "i"      'rmail-input)
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    (define-key map "j"      'rmail-show-message)
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    (define-key map "k"      'rmail-kill-label)
    (define-key map "l"      'rmail-summary-by-labels)
    (define-key map "\e\C-h" 'rmail-summary)
    (define-key map "\e\C-l" 'rmail-summary-by-labels)
    (define-key map "\e\C-r" 'rmail-summary-by-recipients)
    (define-key map "\e\C-s" 'rmail-summary-by-regexp)
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    (define-key map "\e\C-f" 'rmail-summary-by-senders)
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    (define-key map "\e\C-t" 'rmail-summary-by-topic)
    (define-key map "m"      'rmail-mail)
    (define-key map "\em"    'rmail-retry-failure)
    (define-key map "n"      'rmail-next-undeleted-message)
    (define-key map "\en"    'rmail-next-message)
    (define-key map "\e\C-n" 'rmail-next-labeled-message)
    (define-key map "o"      'rmail-output)
    (define-key map "\C-o"   'rmail-output-as-seen)
    (define-key map "p"      'rmail-previous-undeleted-message)
    (define-key map "\ep"    'rmail-previous-message)
    (define-key map "\e\C-p" 'rmail-previous-labeled-message)
    (define-key map "q"      'rmail-quit)
    (define-key map "r"      'rmail-reply)
    ;; I find I can't live without the default M-r command -- rms.
    ;;  (define-key rmail-mode-map "\er"  'rmail-search-backwards)
    (define-key map "s"      'rmail-expunge-and-save)
    (define-key map "\es"    'rmail-search)
    (define-key map "t"      'rmail-toggle-header)
    (define-key map "u"      'rmail-undelete-previous-message)
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    (define-key map "v"      'rmail-mime)
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    (define-key map "w"      'rmail-output-body-to-file)
    (define-key map "\C-c\C-w"    'rmail-widen)
    (define-key map "x"      'rmail-expunge)
    (define-key map "."      'rmail-beginning-of-message)
    (define-key map "/"      'rmail-end-of-message)
    (define-key map "<"      'rmail-first-message)
    (define-key map ">"      'rmail-last-message)
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    (define-key map " "      'scroll-up-command)
    (define-key map "\177"   'scroll-down-command)
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    (define-key map "?"      'describe-mode)
    (define-key map "\C-c\C-s\C-d" 'rmail-sort-by-date)
    (define-key map "\C-c\C-s\C-s" 'rmail-sort-by-subject)
    (define-key map "\C-c\C-s\C-a" 'rmail-sort-by-author)
    (define-key map "\C-c\C-s\C-r" 'rmail-sort-by-recipient)
    (define-key map "\C-c\C-s\C-c" 'rmail-sort-by-correspondent)
    (define-key map "\C-c\C-s\C-l" 'rmail-sort-by-lines)
    (define-key map "\C-c\C-s\C-k" 'rmail-sort-by-labels)
    (define-key map "\C-c\C-n" 'rmail-next-same-subject)
    (define-key map "\C-c\C-p" 'rmail-previous-same-subject)

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    (define-key map [menu-bar] (make-sparse-keymap))

    (define-key map [menu-bar classify]
      (cons "Classify" (make-sparse-keymap "Classify")))
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    (define-key map [menu-bar classify input-menu]
      nil)
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    (define-key map [menu-bar classify output-menu]
      nil)
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    (define-key map [menu-bar classify output-body]
      '("Output body to file..." . rmail-output-body-to-file))
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    (define-key map [menu-bar classify output-inbox]
      '("Output..." . rmail-output))
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    (define-key map [menu-bar classify output]
      '("Output as seen..." . rmail-output-as-seen))
1077

1078 1079
    (define-key map [menu-bar classify kill-label]
      '("Kill Label..." . rmail-kill-label))
1080

1081 1082
    (define-key map [menu-bar classify add-label]
      '("Add Label..." . rmail-add-label))
1083

1084 1085
    (define-key map [menu-bar summary]
      (cons "Summary" (make-sparse-keymap "Summary")))
1086

1087 1088
    (define-key map [menu-bar summary senders]
      '("By Senders..." . rmail-summary-by-senders))
1089

1090 1091
    (define-key map [menu-bar summary labels]
      '("By Labels..." . rmail-summary-by-labels))
1092

1093 1094
    (define-key map [menu-bar summary recipients]
      '("By Recipients..." . rmail-summary-by-recipients))
1095

1096 1097
    (define-key map [menu-bar summary topic]
      '("By Topic..." . rmail-summary-by-topic))
1098

1099 1100
    (define-key map [menu-bar summary regexp]
      '("By Regexp..." . rmail-summary-by-regexp))
1101

1102 1103
    (define-key map [menu-bar summary all]
      '("All" . rmail-summary))
1104

1105 1106
    (define-key map [menu-bar mail]
      (cons "Mail" (make-sparse-keymap "Mail")))
1107

1108 1109
    (define-key map [menu-bar mail rmail-get-new-mail]
      '("Get New Mail" . rmail-get-new-mail))
1110

1111 1112
    (define-key map [menu-bar mail lambda]
      '("----"))
1113

1114 1115
    (define-key map [menu-bar mail continue]
      '("Continue" . rmail-continue))
1116

1117
    (define-key map [menu-bar mail resend]
1118
    '(menu-item "Resend..." rmail-resend :keys "C-u f"))
1119

1120 1121
    (define-key map [menu-bar mail forward]
      '("Forward" . rmail-forward))
1122

1123 1124
    (define-key map [menu-bar mail retry]
      '("Retry" . rmail-retry-failure))
1125

1126 1127
    (define-key map [menu-bar mail reply]
      '("Reply" . rmail-reply))
1128

1129 1130
    (define-key map [menu-bar mail mail]
      '("Mail" . rmail-mail))
1131

1132 1133
    (define-key map [menu-bar delete]
      (cons "Delete" (make-sparse-keymap "Delete")))
1134

1135 1136
    (define-key map [menu-bar delete expunge/save]
      '("Expunge/Save" . rmail-expunge-and-save))
1137

1138 1139
    (define-key map [menu-bar delete expunge]
      '("Expunge" . rmail-expunge))
1140

1141 1142
    (define-key map [menu-bar delete undelete]
      '("Undelete" . rmail-undelete-previous-message))
1143

1144 1145
    (define-key map [menu-bar delete delete]
      '("Delete" . rmail-delete-forward))
1146

1147 1148
    (define-key map [menu-bar move]
      (cons "Move" (make-sparse-keymap "Move")))
1149

1150 1151
    (define-key map [menu-bar move search-back]
      '("Search Back..." . rmail-search-backwards))
1152

1153 1154
    (define-key map [menu-bar move search]
      '("Search..." . rmail-search))
1155

1156 1157
    (define-key map [menu-bar move previous]
      '("Previous Nondeleted" . rmail-previous-undeleted-message))
1158

1159 1160
    (define-key map [menu-bar move next]
      '("Next Nondeleted" . rmail-next-undeleted-message))
1161

1162 1163
    (define-key map [menu-bar move last]
      '("Last" . rmail-last-message))
1164

1165 1166
    (define-key map [menu-bar move first]
      '("First" . rmail-first-message))
1167

1168 1169
    (define-key map [menu-bar move previous]
      '("Previous" . rmail-previous-message))
1170

1171 1172
    (define-key map [menu-bar move next]
      '("Next" . rmail-next-message))
1173

1174 1175
   map)
  "Keymap used in Rmail mode.")
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;; Rmail toolbar
(defvar rmail-tool-bar-map
  (let ((map (make-sparse-keymap)))
    (tool-bar-local-item-from-menu 'rmail-get-new-mail "mail/inbox"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-next-undeleted-message "right-arrow"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-previous-undeleted-message "left-arrow"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-search "search"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-input "open"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-mail "mail/compose"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-reply "mail/reply-all"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-forward "mail/forward"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-delete-forward "close"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-output "mail/move"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-output-body-to-file "mail/save"
				   map rmail-mode-map)
    (tool-bar-local-item-from-menu 'rmail-expunge "delete"
				   map rmail-mode-map)
    map))



;; Rmail mode is suitable only for specially formatted data.
(put 'rmail-mode 'mode-class 'special)

(defun rmail-mode-kill-summary ()
  (if rmail-summary-buffer (kill-buffer rmail-summary-buffer)))

1214 1215
(defvar rmail-enable-multibyte)         ; dynamically bound

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;;;###autoload
(defun rmail-mode ()
  "Rmail Mode is used by \\<rmail-mode-map>\\[rmail] for editing Rmail files.
All normal editing commands are turned off.
Instead, these commands are available:

\\[rmail-beginning-of-message]	Move point to front of this message.
\\[rmail-end-of-message]	Move point to bottom of this message.
\\[scroll-up]	Scroll to next screen of this message.
\\[scroll-down]	Scroll to previous screen of this message.
\\[rmail-next-undeleted-message]	Move to Next non-deleted message.
\\[rmail-previous-undeleted-message]	Move to Previous non-deleted message.
\\[rmail-next-message]	Move to Next message whether deleted or not.
\\[rmail-previous-message]	Move to Previous message whether deleted or not.
\\[rmail-first-message]	Move to the first message in Rmail file.
\\[rmail-last-message]	Move to the last message in Rmail file.
1232
\\[rmail-show-message]	Jump to message specified by numeric position in file.
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
\\[rmail-search]	Search for string and show message it is found in.
\\[rmail-delete-forward]	Delete this message, move to next nondeleted.
\\[rmail-delete-backward]	Delete this message, move to previous nondeleted.
\\[rmail-undelete-previous-message]	Undelete message.  Tries current message, then earlier messages
	till a deleted message is found.
\\[rmail-edit-current-message]	Edit the current message.  \\[rmail-cease-edit] to return to Rmail.
\\[rmail-expunge]	Expunge deleted messages.
\\[rmail-expunge-and-save]	Expunge and save the file.
\\[rmail-quit]       Quit Rmail: expunge, save, then switch to another buffer.
\\[save-buffer] Save without expunging.
\\[rmail-get-new-mail]	Move new mail from system spool directory into this file.
\\[rmail-mail]	Mail a message (same as \\[mail-other-window]).
\\[rmail-continue]	Continue composing outgoing message started before.
\\[rmail-reply]	Reply to this message.  Like \\[rmail-mail] but initializes some fields.
\\[rmail-retry-failure]	Send this message again.  Used on a mailer failure message.
\\[rmail-forward]	Forward this message to another user.
\\[rmail-output]	Output (append) this message to another mail file.
\\[rmail-output-as-seen]	Output (append) this message to file as it's displayed.
\\[rmail-output-body-to-file]	Save message body to a file.  Default filename comes from Subject line.
\\[rmail-input]	Input Rmail file.  Run Rmail on that file.
\\[rmail-add-label]	Add label to message.  It will be displayed in the mode line.
\\[rmail-kill-label]	Kill label.  Remove a label from current message.
\\[rmail-next-labeled-message]   Move to Next message with specified label
          (label defaults to last on