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

;; Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998,
;;   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
;;   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)

(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)

(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)

(defgroup rmail-obsolete nil
  "Rmail obsolete customization variables."
  :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))

(defcustom rmail-pop-password nil
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  "Password to use when reading mail from POP server.
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Please use `rmail-remote-password' instead."
  :type '(choice (string :tag "Password")
		 (const :tag "Not Required" nil))
  :group 'rmail-obsolete)

(defcustom rmail-pop-password-required nil
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  "Non-nil if a password is required when reading mail from a POP server.
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Please use rmail-remote-password-required instead."
  :type 'boolean
  :group 'rmail-obsolete)

(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))
  :set-after '(rmail-pop-password)
  :set #'(lambda (symbol value)
	   (set-default symbol
			(if (and (not value)
                                 (boundp 'rmail-pop-password)
				 rmail-pop-password)
			    rmail-pop-password
			  value))
	   (setq rmail-pop-password nil))
  :group 'rmail-retrieve
  :version "22.1")

(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
  :set-after '(rmail-pop-password-required)
  :set #'(lambda (symbol value)
	   (set-default symbol
			(if (and (not value)
                                 (boundp 'rmail-pop-password-required)
				 rmail-pop-password-required)
			    rmail-pop-password-required
			  value))
	   (setq rmail-pop-password-required nil))
  :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-position-on-field "sendmail" (field &optional soft))
(declare-function mail-text-start "sendmail" ())
(declare-function rmail-dont-reply-to "mail-utils" (destinations))
(declare-function rmail-update-summary "rmailsum" (&rest ignore))

(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)

;;;###autoload
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(defcustom rmail-dont-reply-to-names nil
  "A regexp specifying addresses to prune from a reply message.
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If this is nil, it is set the first time you compose a reply, to
a value which excludes your own email address, plus whatever is
specified by `rmail-default-dont-reply-to-names'.

Matching addresses are excluded from the CC field in replies, and
also the To field, unless this would leave an empty To field."
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  :type '(choice regexp (const :tag "Your Name" nil))
  :group 'rmail-reply)

;;;###autoload
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(defvar rmail-default-dont-reply-to-names "\\`info-"
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  "Regexp specifying part of the default value of `rmail-dont-reply-to-names'.
This is used when the user does not set `rmail-dont-reply-to-names'
explicitly.  (The other part of the default value is the user's
email address and name.)  It is useful to set this variable in
the site customization file.  The default value is conventionally
used for large mailing lists to broadcast announcements.")
;; Is it really useful to set this site-wide?
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;;;###autoload
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(defcustom rmail-ignored-headers
  (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:"
	  "\\|^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 "^x-authentication-warning:"
  "Headers that should be stripped when retrying a failed message."
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  :type '(choice regexp (const nil :tag "None"))
  :group 'rmail-headers)

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;;;###autoload
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(defcustom rmail-highlighted-headers "^From:\\|^Subject:"
  "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")

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

;;;###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.

REGEXP is an expression to match in the preceeding specified FIELD.
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)

;; 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.")

(defcustom rmail-enable-mime nil
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  "If non-nil, RMAIL uses MIME features.
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If the value is t, RMAIL automatically shows MIME decoded message.
If the value is neither t nor nil, RMAIL does not show MIME decoded message
until a user explicitly requires it.

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Even if the value is non-nil, you can't use MIME features
unless the feature specified by `rmail-mime-feature' is available."
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  :type '(choice (const :tag "on" t)
		 (const :tag "off" nil)
		 (other :tag "when asked" ask))
  :group 'rmail)

(defvar rmail-enable-mime-composing nil
  "*If non-nil, RMAIL uses `rmail-insert-mime-forwarded-message-function' to forward.")

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;; FIXME unused.
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(defvar rmail-show-mime-function nil
  "Function to show MIME decoded message of RMAIL file.
This function is called when `rmail-enable-mime' is non-nil.
It is called with no argument.")

;;;###autoload
(defvar rmail-insert-mime-forwarded-message-function nil
  "Function to insert a message in MIME format so it can be forwarded.
This function is called if `rmail-enable-mime' or
`rmail-enable-mime-composing' is non-nil.
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 'rmail-mime
  "Feature to require to load MIME support in Rmail.
When starting Rmail, if `rmail-enable-mime' is non-nil,
this feature is required with `require'.

The default value is `rmail-mime'.  This feature is provided by
the rmail-mime package available at <http://www.m17n.org/rmail-mime/>.")

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;; FIXME this is unused.
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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'.")

(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'
761
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)
	    '("^Reply-To:.*$" . 'rmail-header-name)
	    '("^Subject:" . 'rmail-header-name)
	    '("^X-Spam-Status:" . 'rmail-header-name)
	    '("^\\(To\\|Apparently-To\\|Cc\\|Newsgroups\\):"
	      . 'rmail-header-name)
	    ;; Use MATCH-ANCHORED to effectively anchor the regexp left side.
	    `(,cite-chars
	      (,(concat "\\=[ \t]*"
			"\\(\\(\\([" cite-prefix "]+[" cite-suffix "]*\\)?"
			"\\(" cite-chars "[ \t]*\\)\\)+\\)"
			"\\(.*\\)")
	       (beginning-of-line) (end-of-line)
	       (1 font-lock-comment-delimiter-face nil t)
	       (5 font-lock-comment-face nil t)))
	    '("^\\(X-[a-z0-9-]+\\|In-reply-to\\|Date\\):.*\\(\n[ \t]+.*\\)*$"
	      . 'rmail-header-name))))
  "Additional expressions to highlight in Rmail mode.")

;; 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
		   (pop-to-buffer rmail-summary-buffer)
		   ;; 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))))
809
       (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
by setting `rmail-enable-mime' to non-nil, the required feature
`%s' (the value of `rmail-mime-feature')
is not available in the current session.
So, the MIME support is turned off for the moment."
		rmail-mime-feature)
	:warning)
       (setq rmail-enable-mime nil)))))


;;;###autoload
(defun rmail (&optional file-name-arg)
  "Read and edit incoming mail.
839 840
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))
866
	    (rmail-swap-buffers-maybe)
867 868 869
	    (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)))
876
	 (find-file-noselect file-name))))
877 878
    ;; Ensure that the collection and view buffers are in sync and
    ;; ensure that a message is not being edited.
879 880 881 882 883 884
    (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))
885
    ;; 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
898
	  (setq msg-shown (rmail-get-new-mail)))
899 900
      (progn
	(set-buffer mail-buf)
901 902
	(or msg-shown
	    (rmail-show-message (rmail-first-unseen-message)))
903 904 905 906 907 908 909 910 911 912
	(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."
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  (unless (y-or-n-p "Babyl mail file detected.  Rmail now uses mbox format for mail files.
Convert Babyl mail file to mbox format? ")
    (error "Aborted"))
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  (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...")
951
	  (let ((inhibit-read-only t)
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		(coding-system-for-read 'raw-text)
		(buffer-undo-list t))
954
	    (erase-buffer)
955
	    (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)
	    (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))
973
    (if (re-search-forward rmail-mime-charset-pattern nil t)
974
	(coding-system-from-name (match-string 1))
975 976 977 978
      '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)
    (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)
1019
    (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)
    (define-key map " "      'scroll-up)
    (define-key map "\177"   'scroll-down)
    (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)

1040

1041 1042 1043 1044
    (define-key map [menu-bar] (make-sparse-keymap))

    (define-key map [menu-bar classify]
      (cons "Classify" (make-sparse-keymap "Classify")))
1045

1046 1047
    (define-key map [menu-bar classify input-menu]
      nil)
1048

1049 1050
    (define-key map [menu-bar classify output-menu]
      nil)
1051

1052 1053
    (define-key map [menu-bar classify output-body]
      '("Output body to file..." . rmail-output-body-to-file))
1054

1055 1056
    (define-key map [menu-bar classify output-inbox]
      '("Output..." . rmail-output))
1057

1058 1059
    (define-key map [menu-bar classify output]
      '("Output as seen..." . rmail-output-as-seen))
1060

1061 1062
    (define-key map [menu-bar classify kill-label]
      '("Kill Label..." . rmail-kill-label))
1063

1064 1065
    (define-key map [menu-bar classify add-label]
      '("Add Label..." . rmail-add-label))
1066

1067 1068
    (define-key map [menu-bar summary]
      (cons "Summary" (make-sparse-keymap "Summary")))
1069

1070 1071
    (define-key map [menu-bar summary senders]
      '("By Senders..." . rmail-summary-by-senders))
1072

1073 1074
    (define-key map [menu-bar summary labels]
      '("By Labels..." . rmail-summary-by-labels))
1075

1076 1077
    (define-key map [menu-bar summary recipients]
      '("By Recipients..." . rmail-summary-by-recipients))
1078

1079 1080
    (define-key map [menu-bar summary topic]
      '("By Topic..." . rmail-summary-by-topic))
1081

1082 1083
    (define-key map [menu-bar summary regexp]
      '("By Regexp..." . rmail-summary-by-regexp))
1084

1085 1086
    (define-key map [menu-bar summary all]
      '("All" . rmail-summary))
1087

1088 1089
    (define-key map [menu-bar mail]
      (cons "Mail" (make-sparse-keymap "Mail")))
1090

1091 1092
    (define-key map [menu-bar mail rmail-get-new-mail]
      '("Get New Mail" . rmail-get-new-mail))
1093

1094 1095
    (define-key map [menu-bar mail lambda]
      '("----"))
1096

1097 1098
    (define-key map [menu-bar mail continue]
      '("Continue" . rmail-continue))
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    (define-key map [menu-bar mail resend]
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    '(menu-item "Resend..." rmail-resend :keys "C-u f"))
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    (define-key map [menu-bar mail forward]
      '("Forward" . rmail-forward))
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    (define-key map [menu-bar mail retry]
      '("Retry" . rmail-retry-failure))
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    (define-key map [menu-bar mail reply]
      '("Reply" . rmail-reply))
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    (define-key map [menu-bar mail mail]
      '("Mail" . rmail-mail))
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    (define-key map [menu-bar delete]
      (cons "Delete" (make-sparse-keymap "Delete")))
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    (define-key map [menu-bar delete expunge/save]
      '("Expunge/Save" . rmail-expunge-and-save))
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    (define-key map [menu-bar delete expunge]
      '("Expunge" . rmail-expunge))
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    (define-key map [menu-bar delete undelete]
      '("Undelete" . rmail-undelete-previous-message))
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    (define-key map [menu-bar delete delete]
      '("Delete" . rmail-delete-forward))
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    (define-key map [menu-bar move]
      (cons "Move" (make-sparse-keymap "Move")))
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    (define-key map [menu-bar move search-back]
      '("Search Back..." . rmail-search-backwards))
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    (define-key map [menu-bar move search]
      '("Search..." . rmail-search))
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    (define-key map [menu-bar move previous]
      '("Previous Nondeleted" . rmail-previous-undeleted-message))
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    (define-key map [menu-bar move next]
      '("Next Nondeleted" . rmail-next-undeleted-message))
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    (define-key map [menu-bar move last]
      '("Last" . rmail-last-message))
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    (define-key map [menu-bar move first]
      '("First" . rmail-first-message))
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    (define-key map [menu-bar move previous]
      '("Previous" . rmail-previous-message))
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    (define-key map [menu-bar move next]
      '("Next" . rmail-next-message))
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   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)))

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(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.
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\\[rmail-show-message]	Jump to message specified by numeric position in file.
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\\[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 one specified).
          Standard labels: filed, unseen, answered, forwarded, deleted.
          Any other label is present only if you add it with \\[rmail-add-label].
\\[rmail-previous-labeled-message]   Move to Previous message with specified label
\\[rmail-summary]	Show headers buffer, with a one line summary of each message.
\\[rmail-summary-by-labels]	Summarize only messages with particular label(s).
\\[rmail-summary-by-recipients]   Summarize only messages with particular recipient(s).
\\[rmail-summary-by-regexp]   Summarize only messages with particular regexp(s).
\\[rmail-summary-by-topic]   Summarize only messages with subject line regexp(s).
\\[rmail-toggle-header]	Toggle display of complete header."
  (interactive)
  (let ((finding-rmail-file (not (eq major-mode 'rmail-mode))))
    (rmail-mode-2)
    (when (and finding-rmail-file
	       (null coding-system-for-read)
	       default-enable-multibyte-characters)
      (let ((rmail-enable-multibyte t))
	(rmail-require-mime-maybe)
	(rmail-convert-file-maybe)
	(goto-char (point-max))
	(set-buffer-multibyte t)))
    (rmail-set-message-counters)
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    (rmail-show-message rmail-total-messages)
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    (when finding-rmail-file
      (when rmail-display-summary
	(rmail-summary))
      (rmail-construct-io-menu))
    (run-mode-hooks 'rmail-mode-hook)))

(defun rmail-mode-2 ()
  (kill-all-local-variables)
  (rmail-mode-1)
  (rmail-perm-variables)
  (rmail-variables))

(defun rmail-mode-1 ()
  (setq major-mode 'rmail-mode)
  (setq mode-name "RMAIL")
  (setq buffer-read-only t)
  ;; No need to auto save RMAIL files in normal circumstances
  ;; because they contain no info except attribute changes
  ;; and deletion of messages.
  ;; The one exception is when messages are copied into another mbox buffer.
  ;; rmail-output enables auto save when you do that.
  (setq buffer-auto-save-file-name nil)
  (use-local-map rmail-mode-map)
  (set-syntax-table text-mode-syntax-table)
  (setq local-abbrev-table text-mode-abbrev-table)
  ;; Functions to support buffer swapping:
  (add-hook 'write-region-annotate-functions
	    'rmail-write-region-annotate nil t)
  (add-hook 'kill-buffer-hook 'rmail-mode-kill-buffer-hook nil t)
  (add-hook 'change-major-mode-hook 'rmail-change-major-mode-hook nil t))

(defun rmail-generate-viewer-buffer ()
  "Return a reusable buffer suitable for viewing messages.
Create the buffer if necessary."
  (let* ((suffix (file-name-nondirectory (or buffer-file-name (buffer-name))))
	 (name (format " *message-viewer %s*" suffix))
	 (buf (get-buffer name)))
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    (or buf
	(generate-new-buffer name))))
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(defun rmail-swap-buffers ()
  "Swap text between current buffer and `rmail-view-buffer'.
This function preserves the current buffer's modified flag, and also
sets the current buffer's `buffer-file-coding-system' to that of
`rmail-view-buffer'."
  (let ((modp (buffer-modified-p))
	(coding
	 (with-current-buffer rmail-view-buffer
	   buffer-file-coding-system)))
    (buffer-swap-text rmail-view-buffer)
    (setq buffer-file-coding-system coding)
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    (restore-buffer-modified-p modp)))
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(defun rmail-buffers-swapped-p ()
  "Return non-nil if the message collection is in `rmail-view-buffer'."
  ;; This is analogous to tar-data-swapped-p in tar-mode.el.
  (and (buffer-live-p rmail-view-buffer)
       rmail-buffer-swapped))

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(defun rmail-change-major-mode-hook ()
  ;; Bring the actual Rmail messages back into the main buffer.
  (when (rmail-buffers-swapped-p)
    (rmail-swap-buffers)
    (setq rmail-buffer-swapped nil)))

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(defun rmail-swap-buffers-maybe ()
  "Determine if the Rmail buffer is showing a message.
If so restore the actual mbox message collection."
  (with-current-buffer rmail-buffer
    (when (rmail-buffers-swapped-p)
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      (rmail-swap-buffers)
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      (setq rmail-buffer-swapped nil))))

(defun rmail-mode-kill-buffer-hook ()
  (if (buffer-live-p rmail-view-buffer) (kill-buffer rmail-view-buffer)))

;; Set up the permanent locals associated with an Rmail file.
(defun rmail-perm-variables ()
  (make-local-variable 'rmail-last-regexp)
  (make-local-variable 'rmail-deleted-vector)
  (make-local-variable 'rmail-buffer)
  (setq rmail-buffer (current-buffer))
  (set-buffer-multibyte nil)
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  (with-current-buffer (setq rmail-view-buffer (rmail-generate-viewer-buffer))
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    (setq buffer-undo-list t)
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    (set (make-local-variable 'rmail-overlay-list) nil)
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    (set-buffer-multibyte t)
    ;; Force C-x C-s write Unix EOLs.
    (set-buffer-file-coding-system 'undecided-unix))
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  (make-local-variable 'rmail-summary-buffer)
  (make-local-variable 'rmail-summary-vector)
  (make-local-variable 'rmail-current-message)
  (make-local-variable 'rmail-total-messages)
  (setq rmail-total-messages 0)
  (make-local-variable 'rmail-message-vector)
  (make-local-variable 'rmail-msgref-vector)
  (make-local-variable 'rmail-inbox-list)
  ;; Provide default set of inboxes for primary mail file ~/RMAIL.
  (and (null rmail-inbox-list)
       (or (equal buffer-file-name (expand-file-name rmail-file-name))
	   (equal buffer-file-truename
		  (abbreviate-file-name (file-truename rmail-file-name))))
       (setq rmail-inbox-list
	     (or rmail-primary-inbox-list
		 (list (or (getenv "MAIL")
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			   ;; FIXME expand-file-name?
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