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

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;; Copyright (C) 1985,86,87,88,93,94,95,96,97 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: mail
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;; 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
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;; the Free Software Foundation; either version 2, or (at your option)
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;; 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
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;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
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;;; Code:
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;; 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.

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;; 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.
;;

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(require 'mail-utils)
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;; For Emacs V18 compatibility
(and (not (fboundp 'buffer-disable-undo))
     (fboundp 'buffer-flush-undo)
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     (defalias 'buffer-disable-undo 'buffer-flush-undo))
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; These variables now declared in paths.el.
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;(defvar rmail-spool-directory "/usr/spool/mail/"
;  "This is the name of the directory used by the system mailer for\n\
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;delivering new mail.  Its name should end with a slash.")
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;(defvar rmail-file-name
;  (expand-file-name "~/RMAIL")
;  "")

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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)


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(defvar rmail-movemail-program nil
  "If non-nil, name of program for fetching new mail.")

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(defcustom rmail-pop-password nil
  "*Password to use when reading mail from a POP server, if required."
  :type '(choice (string :tag "Password")
		 (const :tag "Not Required" nil))
  :group 'rmail-retrieve)
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(defcustom rmail-pop-password-required nil
  "*Non-nil if a password is required when reading mail using POP."
  :type 'boolean
  :group 'rmail-retrieve)
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(defvar rmail-pop-password-error "invalid usercode or password"
  "Regular expression matching incorrect-password POP server error messages.
If you get an incorrect-password error that this expression does not match,
please report it with \\[report-emacs-bug].")

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(defcustom rmail-preserve-inbox nil
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  "*Non-nil if incoming mail should be left in the user's inbox,
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rather than deleted, after it is retrieved."
  :type 'boolean
  :group 'rmail-retrieve)
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;;;###autoload
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(defcustom rmail-dont-reply-to-names nil "\
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*A regexp specifying names to prune of reply to messages.
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A value of nil means exclude your own name only."
  :type '(choice regexp (const :tag "Your Name" nil))
  :group 'rmail-reply)
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;;;###autoload
(defvar rmail-default-dont-reply-to-names "info-" "\
A regular expression specifying part of the value of the default value of
the variable `rmail-dont-reply-to-names', for when the user does not set
`rmail-dont-reply-to-names' explicitly.  (The other part of the default
value is the user's name.)
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It is useful to set this variable in the site customization file.")
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;;;###autoload
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(defcustom rmail-ignored-headers "^via:\\|^mail-from:\\|^origin:\\|^references:\\|^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:\\|^x-mailer:\\|^delivered-to:\\|^lines:\\|^mime-version:\\|^content-transfer-encoding:"
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  "*Regexp to match header fields that Rmail should normally hide."
  :type '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.
If nil, display all header fields except those matched by
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`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 nil "\
*Headers that should be stripped when retrying a failed message."
  :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:" "\
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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.
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See also `rmail-highlight-face'."
  :type 'regexp
  :group 'rmail-headers)
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;;;###autoload
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(defcustom rmail-highlight-face nil "\
*Face used by Rmail for highlighting headers."
  :type '(choice (const :tag "Default" nil)
		 face)
  :group 'rmail-headers)
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;;;###autoload
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(defcustom rmail-delete-after-output nil "\
*Non-nil means automatically delete a message that is copied to a file."
  :type 'boolean
  :group 'rmail-files)
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;;;###autoload
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(defcustom rmail-primary-inbox-list nil "\
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*List of files which are inboxes for user's primary mail file `~/RMAIL'.
`nil' means the default, which is (\"/usr/spool/mail/$USER\")
\(the name varies depending on the operating system,
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and the value of the environment variable MAIL overrides it)."
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  ;; Don't use backquote here, because we don't want to need it
  ;; at load time.
  :type (list 'choice '(const :tag "Default" nil)
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	      (list 'repeat ':value (or (getenv "MAIL")
					(concat "/var/spool/mail/"
						(getenv "USER")))
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		    'file))
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  :group 'rmail-retrieve
  :group 'rmail-files)
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;;;###autoload
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(defcustom rmail-mail-new-frame nil
  "*Non-nil means Rmail makes a new frame for composing outgoing mail."
  :type 'boolean
  :group 'rmail-reply)
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;;;###autoload
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(defcustom rmail-secondary-file-directory "~/"
  "*Directory for additional secondary Rmail files."
  :type 'directory
  :group 'rmail-files)
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;;;###autoload
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(defcustom rmail-secondary-file-regexp "\\.xmail$"
  "*Regexp for which files are secondary Rmail files."
  :type 'regexp
  :group 'rmail-files)
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;;;###autoload
(defvar rmail-mode-hook nil
  "List of functions to call when Rmail is invoked.")

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

;;;###autoload
(defvar rmail-show-message-hook nil
  "List of functions to call when Rmail displays a message.")

;;;###autoload
(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.")

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

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

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;; Some mailers use "Re(2):" or "Re^2:" or "Re: Re:" or "Re[2]:".
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;; This pattern should catch all the common variants.
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(defvar rmail-reply-regexp "\\`\\(Re\\(([0-9]+)\\|\\[[0-9]+\\]\\|\\^[0-9]+\\)?: *\\)*"
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  "Regexp to delete from Subject line before inserting `rmail-reply-prefix'.")
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(defvar rmail-display-summary nil
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  "If non-nil, Rmail always displays the summary buffer.")
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(defvar rmail-mode-map nil)

(defvar rmail-inbox-list nil)
(defvar rmail-keywords nil)

;; Message counters and markers.  Deleted flags.

(defvar rmail-current-message nil)
(defvar rmail-total-messages nil)
(defvar rmail-message-vector nil)
(defvar rmail-deleted-vector nil)
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(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.")
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(defvar rmail-overlay-list nil)

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(defvar rmail-font-lock-keywords
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  (eval-when-compile
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    (let* ((cite-chars "[>|}]")
	   (cite-prefix "A-Za-z")
	   (cite-suffix (concat cite-prefix "0-9_.@-`'\"")))
      (list '("^\\(From\\|Sender\\):" . font-lock-function-name-face)
	    '("^Reply-To:.*$" . font-lock-function-name-face)
	    '("^Subject:" . font-lock-comment-face)
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	    '("^\\(To\\|Apparently-To\\|Cc\\|Newsgroups\\):"
	      . font-lock-keyword-face)
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	    ;; Use MATCH-ANCHORED to effectively anchor the regexp left side.
	    `(,cite-chars
	      (,(concat "\\=[ \t]*"
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			"\\(\\([" cite-prefix "]+[" cite-suffix "]*\\)?"
			"\\(" cite-chars "[ \t]*\\)\\)+"
			"\\(.*\\)")
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	       (beginning-of-line) (end-of-line)
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	       (2 font-lock-reference-face nil t)
	       (4 font-lock-comment-face nil t)))
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	    '("^\\(X-[A-Za-z0-9-]+\\|In-reply-to\\|Date\\):.*$"
	      . font-lock-string-face))))
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  "Additional expressions to highlight in Rmail mode.")

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;; These are used by autoloaded rmail-summary.

(defvar rmail-summary-buffer nil)
(defvar rmail-summary-vector nil)

;; `Sticky' default variables.

;; Last individual label specified to a or k.
(defvar rmail-last-label nil)
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;; Last set of values specified to C-M-n, C-M-p, C-M-s or C-M-l.
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(defvar rmail-last-multi-labels nil)
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(defvar rmail-last-regexp nil)
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(defcustom rmail-default-file "~/xmail"
  "*Default file name for \\[rmail-output]."
  :type 'file
  :group 'rmail-files)
(defcustom rmail-default-rmail-file "~/XMAIL"
  "*Default file name for \\[rmail-output-to-rmail-file]."
  :type 'file
  :group 'rmail-files)
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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
;;; this expression, you must change the code in rmail-nuke-pinhead-header
;;; that knows the exact ordering of the \\( \\) subexpressions.
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(defvar rmail-unix-mail-delimiter
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  (let ((time-zone-regexp
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	 (concat "\\([A-Z]?[A-Z]?[A-Z][A-Z]\\( DST\\)?"
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		 "\\|[-+]?[0-9][0-9][0-9][0-9]"
		 "\\|"
		 "\\) *")))
    (concat
     "From "

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     ;; 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'.
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     ;; 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.
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     ;; 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.
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     "\\([^\0-\b\n-\r\^?].*\\)? "
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     ;; The time the message was sent.
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     "\\([^\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
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     ;; Perhaps a time zone, specified by an abbreviation, or by a
     ;; numeric offset.
     time-zone-regexp

     ;; The year.
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     " \\([0-9][0-9]+\\) *"
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     ;; On some systems the time zone can appear after the year, too.
     time-zone-regexp

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

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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)
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  (` (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))))
	 (save-excursion
	   (set-buffer rmail-summary-buffer)
	   (let ((rmail-total-messages total))
	     (,@ body))))
       (rmail-maybe-display-summary))))
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(defvar rmail-view-buffer nil
  "Buffer which holds RMAIL message for displaying.")

;; 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.")

;;;###autoload
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(defcustom rmail-enable-mime nil
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  "*If non-nil, RMAIL uses MIME feature.
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
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until a user explicitly requires it."
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  :type '(choice (const :tag "on" t)
		 (const :tag "off" nil)
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		 (sexp :tag "when asked" :format "%t\n" ask))
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  :group 'rmail)
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;;;###autoload
(defvar rmail-show-mime-function nil
  "Function to show MIME decoded message of RMAIL file.")

;;;###autoload
(defvar rmail-mime-feature 'rmail-mime
  "Feature to provide for using MIME feature in RMAIL.
When starting rmail, this feature is requrired if rmail-enable-mime
is non-nil.")

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;;;; *** Rmail Mode ***

;;;###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' (a babyl format file)
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 and edits that file in RMAIL Mode.
Type \\[describe-mode] once editing that file, for a list of RMAIL commands.

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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
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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."
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  (interactive (if current-prefix-arg
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		   (list (read-file-name "Run rmail on RMAIL file: "))))
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  (if rmail-enable-mime
      (condition-case err
	  (require rmail-mime-feature)
	(error (message "Feature `%s' not provided" rmail-mime-feature)
	       (sit-for 1)
	       (setq rmail-enable-mime nil))))
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  (let* ((file-name (expand-file-name (or file-name-arg rmail-file-name)))
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	 (existed (get-file-buffer file-name))
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	 (coding-system-for-read 'no-conversion)
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	 run-mail-hook)
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    ;; Like find-file, but in the case where a buffer existed
    ;; and the file was reverted, recompute the message-data.
    (if (and existed (not (verify-visited-file-modtime existed)))
	(progn
	  ;; Don't be confused by apparent local-variables spec
	  ;; in the last message in the RMAIL file.
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	  (let ((enable-local-variables nil))
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	    (find-file file-name))
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	  (if (and (verify-visited-file-modtime existed)
		   (eq major-mode 'rmail-mode))
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	      (progn (rmail-forget-messages)
		     (rmail-set-message-counters))))
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      (let ((enable-local-variables nil))
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	(find-file file-name)))
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    (if (eq major-mode 'rmail-edit-mode)
	(error "Exit Rmail Edit mode before getting new mail."))
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    (if (and existed (> (buffer-size) 0))
	;; Buffer not new and not empty; ensure in proper mode, but that's all.
	(or (eq major-mode 'rmail-mode)
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	    (progn (rmail-mode-2)
		   (setq run-mail-hook t)))
      (setq run-mail-hook t)
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      (rmail-mode-2)
      ;; Convert all or part to Babyl file if possible.
      (rmail-convert-file)
      (goto-char (point-max))
      (if (null rmail-inbox-list)
	  (progn
	    (rmail-set-message-counters)
	    (rmail-show-message))))
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    (or (and (null file-name-arg)
	     (rmail-get-new-mail))
	(rmail-show-message (rmail-first-unseen-message)))
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    (if rmail-display-summary (rmail-summary))
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    (rmail-construct-io-menu)
    (if run-mail-hook
	(run-hooks 'rmail-mode-hook))))
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;; Given the value of MAILPATH, return a list of inbox file names.
;; This is turned off because it is not clear that the user wants
;; all these inboxes to feed into the primary rmail file.
; (defun rmail-convert-mailpath (string)
;   (let (idx list)
;     (while (setq idx (string-match "[%:]" string))
;       (let ((this (substring string 0 idx)))
; 	(setq string (substring string (1+ idx)))
; 	(setq list (cons (if (string-match "%" this)
; 			     (substring this 0 (string-match "%" this))
; 			   this)
; 			 list))))
;     list))

; I have checked that adding "-*- rmail -*-" to the BABYL OPTIONS line
; will not cause emacs 18.55 problems.

(defun rmail-convert-file ()
  (let (convert)
    (widen)
    (goto-char (point-min))
    ;; If file doesn't start like a Babyl file,
    ;; convert it to one, by adding a header and converting each message.
    (cond ((looking-at "BABYL OPTIONS:"))
	  ((looking-at "Version: 5\n")
	   ;; Losing babyl file made by old version of Rmail.
	   ;; Just fix the babyl file header; don't make a new one,
	   ;; so we don't lose the Labels: file attribute, etc.
	   (let ((buffer-read-only nil))
	     (insert "BABYL OPTIONS: -*- rmail -*-\n")))
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	  ((equal (point-min) (point-max))
	   ;; Empty RMAIL file.  Just insert the header.
	   (rmail-insert-rmail-file-header))
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	  (t
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	   ;; Non-empty file in non-RMAIL format.  Add header and convert.
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	   (setq convert t)
	   (rmail-insert-rmail-file-header)))
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    (if (and (not convert)
	     (not rmail-enable-mime)
	     rmail-file-coding-system)
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	;; Decode coding system of BABYL part at the head only.  The
	;; remaining non BABYL parts are decoded in
	;; rmail-convert-to-babyl-format if necessary.
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	(rmail-decode-babyl-format))
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    ;; If file was not a Babyl file or if there are
    ;; Unix format messages added at the end,
    ;; convert file as necessary.
    (if (or convert
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	    (save-excursion
	      (goto-char (point-max))
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	      (search-backward "\n\^_")
	      (forward-char 2)
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	      (looking-at "\n*From ")))
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	(let ((buffer-read-only nil))
	  (message "Converting to Babyl format...")
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	  ;; If file needs conversion, convert it all,
	  ;; except for the BABYL header.
	  ;; (rmail-convert-to-babyl-format would delete the header.)
	  (goto-char (point-min))
	  (search-forward "\n\^_" nil t)
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	  (narrow-to-region (point) (point-max))
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	  (rmail-convert-to-babyl-format)
	  (message "Converting to Babyl format...done")))))

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;;; I have checked that adding "-*- rmail -*-" to the BABYL OPTIONS line
;;; will not cause emacs 18.55 problems.
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(defun rmail-insert-rmail-file-header ()
  (let ((buffer-read-only nil))
    (insert "BABYL OPTIONS: -*- rmail -*-
Version: 5
Labels:
Note:   This is the header of an rmail file.
Note:   If you are seeing it in rmail,
Note:    it means the file has no messages in it.\n\^_")))

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;; Decode Babyl formated part at the head of current buffer by
;; rmail-file-coding-system.

(defun rmail-decode-babyl-format ()
  (let ((modifiedp (buffer-modified-p))
	(buffer-read-only nil)
	pos)
    (goto-char (point-min))
    (search-forward "\n\^_" nil t)	; Skip BYBYL header.
    (setq pos (point))
    (message "Decoding messages...")
    (while (search-forward "\n\^_" nil t)
      (decode-coding-region pos (point) rmail-file-coding-system)
      (setq pos (point)))
    (message "Decoding messages...done")
    (set-buffer-file-coding-system rmail-file-coding-system)
    (set-buffer-modified-p modifiedp)))

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

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

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(define-key rmail-mode-map [menu-bar classify input-menu]
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  nil)
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(define-key rmail-mode-map [menu-bar classify output-menu]
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  nil)
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(define-key rmail-mode-map [menu-bar classify output-body]
  '("Output body to file..." . rmail-output-body-to-file))

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(define-key rmail-mode-map [menu-bar classify output-inbox]
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  '("Output (inbox)..." . rmail-output))
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(define-key rmail-mode-map [menu-bar classify output]
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  '("Output (Rmail)..." . rmail-output-to-rmail-file))
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(define-key rmail-mode-map [menu-bar classify kill-label]
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  '("Kill Label..." . rmail-kill-label))
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(define-key rmail-mode-map [menu-bar classify add-label]
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  '("Add Label..." . rmail-add-label))
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(define-key rmail-mode-map [menu-bar summary]
  (cons "Summary" (make-sparse-keymap "Summary")))

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

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(define-key rmail-mode-map [menu-bar summary labels]
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  '("By Labels..." . rmail-summary-by-labels))
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(define-key rmail-mode-map [menu-bar summary recipients]
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  '("By Recipients..." . rmail-summary-by-recipients))
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(define-key rmail-mode-map [menu-bar summary topic]
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  '("By Topic..." . rmail-summary-by-topic))
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(define-key rmail-mode-map [menu-bar summary regexp]
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  '("By Regexp..." . rmail-summary-by-regexp))
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(define-key rmail-mode-map [menu-bar summary all]
  '("All" . rmail-summary))

(define-key rmail-mode-map [menu-bar mail]
  (cons "Mail" (make-sparse-keymap "Mail")))
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(define-key rmail-mode-map [menu-bar mail rmail-get-new-mail]
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  '("Get New Mail" . rmail-get-new-mail))

(define-key rmail-mode-map [menu-bar mail lambda]
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  '("----"))
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(define-key rmail-mode-map [menu-bar mail continue]
  '("Continue" . rmail-continue))

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(define-key rmail-mode-map [menu-bar mail resend]
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  '("Re-send..." . rmail-resend))
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(define-key rmail-mode-map [menu-bar mail forward]
  '("Forward" . rmail-forward))

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

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

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

(define-key rmail-mode-map [menu-bar delete]
  (cons "Delete" (make-sparse-keymap "Delete")))

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

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

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

(define-key rmail-mode-map [menu-bar move]
  (cons "Move" (make-sparse-keymap "Move")))

(define-key rmail-mode-map [menu-bar move search-back]
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  '("Search Back..." . rmail-search-backwards))
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(define-key rmail-mode-map [menu-bar move search]
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  '("Search..." . rmail-search))
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(define-key rmail-mode-map [menu-bar move previous]
  '("Previous Nondeleted" . rmail-previous-undeleted-message))

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

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

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

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

(define-key rmail-mode-map [menu-bar move next]
  '("Next" . rmail-next-message))

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;; Rmail mode is suitable only for specially formatted data.
(put 'rmail-mode 'mode-class 'special)

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

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;;;###autoload
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(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 (same as \\[beginning-of-buffer]).
\\[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.
\\[rmail-show-message]	Jump to message specified by numeric position in file.
\\[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.
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\\[rmail-edit-current-message]	Edit the current message.  \\[rmail-cease-edit] to return to Rmail.
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\\[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.
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\\[rmail-get-new-mail]	Move new mail from system spool directory into this file.
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\\[rmail-mail]	Mail a message (same as \\[mail-other-window]).
\\[rmail-continue]	Continue composing outgoing message started before.
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\\[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.
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\\[rmail-forward]	Forward this message to another user.
\\[rmail-output-to-rmail-file]       Output this message to an Rmail file (append it).
\\[rmail-output]	Output this message to a Unix-format mail file (append it).
\\[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.
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          Any other label is present only if you add it with \\[rmail-add-label].
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\\[rmail-previous-labeled-message]   Move to Previous message with specified label
\\[rmail-summary]	Show headers buffer, with a one line summary of each message.
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\\[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."
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  (interactive)
  (rmail-mode-2)
  (rmail-set-message-counters)
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  (rmail-show-message rmail-total-messages)
  (run-hooks 'rmail-mode-hook))
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(defun rmail-mode-2 ()
  (kill-all-local-variables)
  (rmail-mode-1)
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  (rmail-variables))
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(defun rmail-mode-1 ()
  (setq major-mode 'rmail-mode)
  (setq mode-name "RMAIL")
  (setq buffer-read-only t)
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  ;; 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 an Rmail mode buffer.
  ;; rmail-output-to-rmail-file enables auto save when you do that.
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  (setq buffer-auto-save-file-name nil)
  (if (boundp 'mode-line-modified)
      (setq mode-line-modified "--- ")
    (setq mode-line-format
	  (cons "--- " (cdr (default-value 'mode-line-format)))))
  (use-local-map rmail-mode-map)
  (set-syntax-table text-mode-syntax-table)
  (setq local-abbrev-table text-mode-abbrev-table))

(defun rmail-variables ()
  (make-local-variable 'revert-buffer-function)
  (setq revert-buffer-function 'rmail-revert)
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  (make-local-variable 'font-lock-defaults)
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  (setq font-lock-defaults
   '(rmail-font-lock-keywords t nil nil nil
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     (font-lock-maximum-size . nil)
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     (font-lock-fontify-buffer-function . rmail-fontify-buffer-function)
     (font-lock-unfontify-buffer-function . rmail-unfontify-buffer-function)
     (font-lock-inhibit-thing-lock . (lazy-lock-mode fast-lock-mode))))
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  (make-local-variable 'rmail-last-label)
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  (make-local-variable 'rmail-last-regexp)
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  (make-local-variable 'rmail-deleted-vector)
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  (make-local-variable 'rmail-buffer)
  (setq rmail-buffer (current-buffer))
  (make-local-variable 'rmail-view-buffer)
  (setq rmail-view-buffer rmail-buffer)
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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)
  (make-local-variable 'require-final-newline)
  (setq require-final-newline nil)
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  (make-local-variable 'rmail-overlay-list)
  (setq rmail-overlay-list nil)
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  (make-local-variable 'version-control)
  (setq version-control 'never)
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  (make-local-variable 'kill-buffer-hook)
  (add-hook 'kill-buffer-hook 'rmail-mode-kill-summary)
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  (make-local-variable 'file-precious-flag)
  (setq file-precious-flag t)
  (make-local-variable 'rmail-message-vector)
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  (make-local-variable 'rmail-msgref-vector)
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  (make-local-variable 'rmail-inbox-list)
  (setq rmail-inbox-list (rmail-parse-file-inboxes))
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  ;; Provide default set of inboxes for primary mail file ~/RMAIL.
  (and (null rmail-inbox-list)
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       (or (equal buffer-file-name (expand-file-name rmail-file-name))
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	   (equal buffer-file-truename
		  (abbreviate-file-name (file-truename rmail-file-name))))
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       (setq rmail-inbox-list
	     (or rmail-primary-inbox-list
		 (list (or (getenv "MAIL")
			   (concat rmail-spool-directory
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				   (user-login-name)))))))
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  (make-local-variable 'rmail-keywords)
  ;; this gets generated as needed
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  (setq rmail-keywords nil))
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;; Handle M-x revert-buffer done in an rmail-mode buffer.
(defun rmail-revert (arg noconfirm)
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  (let ((revert-buffer-function (default-value 'revert-buffer-function)))
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    ;; Call our caller again, but this time it does the default thing.
    (if (revert-buffer arg noconfirm)
	;; If the user said "yes", and we changed something,
	;; reparse the messages.
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	;; But, we don't have to convert coding system because backup
	;; files should have been saved by Emacs' internal format.
	(let ((rmail-file-coding-system nil)
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	      (enable-multibyte-characters nil))
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	  (rmail-convert-file)
	  (goto-char (point-max))
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	  (rmail-mode)))))
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;; Return a list of files from this buffer's Mail: option.
;; Does not assume that messages have been parsed.
;; Just returns nil if buffer does not look like Babyl format.
(defun rmail-parse-file-inboxes ()
  (save-excursion
    (save-restriction
      (widen)
      (goto-char 1)
      (cond ((looking-at "BABYL OPTIONS:")
	     (search-forward "\n\^_" nil 'move)
	     (narrow-to-region 1 (point))
	     (goto-char 1)
	     (if (search-forward "\nMail:" nil t)
		 (progn
		   (narrow-to-region (point) (progn (end-of-line) (point)))
		   (goto-char (point-min))
		   (mail-parse-comma-list))))))))

(defun rmail-expunge-and-save ()
  "Expunge and save RMAIL file."
  (interactive)
  (rmail-expunge)
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  (save-buffer)
  (if (rmail-summary-exists)
      (rmail-select-summary (set-buffer-modified-p nil))))
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(defun rmail-quit ()
  "Quit out of RMAIL."
  (interactive)
  (rmail-expunge-and-save)
  ;; Don't switch to the summary buffer even if it was recently visible.
  (if rmail-summary-buffer
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      (progn
	(replace-buffer-in-windows rmail-summary-buffer)
	(bury-buffer rmail-summary-buffer)))
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  (let ((obuf (current-buffer)))
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    (replace-buffer-in-windows obuf)
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    (bury-buffer obuf)))

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(defun rmail-bury ()
  "Bury current Rmail buffer and its summary buffer."
  (interactive)
  ;; This let var was called rmail-buffer, but that interfered
  ;; with the buffer-local var used in summary buffers.
  (let ((buffer-to-bury (current-buffer)))
    (if (rmail-summary-exists)
	(let (window)
	  (while (setq window (get-buffer-window rmail-summary-buffer))
	    (set-window-buffer window (other-buffer rmail-summary-buffer)))
	  (bury-buffer rmail-summary-buffer)))
    (switch-to-buffer (other-buffer (current-buffer)))
    (bury-buffer buffer-to-bury)))

(defun rmail-duplicate-message ()
  "Create a duplicated copy of the current message.
The duplicate copy goes into the Rmail file just after the
original copy."
  (interactive)
  (widen)
  (let ((buffer-read-only nil)
	(number rmail-current-message)
	(string (buffer-substring (rmail-msgbeg rmail-current-message)
				  (rmail-msgend rmail-current-message))))
    (goto-char (rmail-msgend rmail-current-message))
    (insert string)
    (rmail-forget-messages)
    (rmail-show-message number)
    (message "Message duplicated")))

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;;;###autoload
(defun rmail-input (filename)
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  "Run Rmail on file FILENAME."
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  (interactive "FRun rmail on RMAIL file: ")
  (rmail filename))

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;; This used to scan subdirectories recursively, but someone pointed out
;; that if the user wants that, person can put all the files in one dir.
;; And the recursive scan was slow.  So I took it out.
;; rms, Sep 1996.
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(defun rmail-find-all-files (start)
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  "Return list of file in dir START that match `rmail-secondary-file-regexp'."
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  (if (file-accessible-directory-p start)
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      ;; Don't sort here.
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      (let* ((case-fold-search t)
	     (files (directory-files start t rmail-secondary-file-regexp)))
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	;; Sort here instead of in directory-files
	;; because this list is usually much shorter.
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	(sort files 'string<))))
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(defun rmail-list-to-menu (menu-name l action &optional full-name)
  (let ((menu (make-sparse-keymap menu-name)))
    (mapcar
     (function (lambda (item)
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		 (let (command)
		   (if (consp item)
		       (progn
			 (setq command
			       (rmail-list-to-menu (car item) (cdr item) 
						   action 
						   (if full-name
						       (concat full-name "/"
							       (car item))
						     (car item))))
			 (setq name (car item)))
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		     (progn
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		       (setq name item)
		       (setq command 
			     (list 'lambda () '(interactive)
				   (list action
					 (expand-file-name 
					  (if full-name
					      (concat full-name "/" item)
					    item)
					  rmail-secondary-file-directory))))))
		   (define-key menu (vector (intern name))
		     (cons name command)))))
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     (reverse l))
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    menu))
 
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;; This command is always "disabled" when it appears in a menu.
(put 'rmail-disable-menu 'menu-enable ''nil)

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(defun rmail-construct-io-menu ()
  (let ((files (rmail-find-all-files rmail-secondary-file-directory)))
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    (if files
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	(progn
	  (define-key rmail-mode-map [menu-bar classify input-menu]
	    (cons "Input Rmail File" 
		  (rmail-list-to-menu "Input Rmail File" 
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				      files
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				      'rmail-input)))
	  (define-key rmail-mode-map [menu-bar classify output-menu]
	    (cons "Output Rmail File" 
		  (rmail-list-to-menu "Output Rmail File" 
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				      files
				      'rmail-output-to-rmail-file))))

      (define-key rmail-mode-map [menu-bar classify input-menu]
	'("Input Rmail File" . rmail-disable-menu))
      (define-key rmail-mode-map [menu-bar classify output-menu]
	'("Output Rmail File" . rmail-disable-menu)))))
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;;;; *** Rmail input ***

;; RLK feature not added in this version:
;; argument specifies inbox file or files in various ways.

(defun rmail-get-new-mail (&optional file-name)
  "Move any new mail from this RMAIL file's inbox files.
The inbox files can be specified with the file's Mail: option.  The
variable `rmail-primary-inbox-list' specifies the inboxes for your
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primary RMAIL file if it has no Mail: option.  By default, this is
your /usr/spool/mail/$USER.
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You can also specify the file to get new mail from.  In this case, the
file of new mail is not changed or deleted.  Noninteractively, you can
pass the inbox file name as an argument.  Interactively, a prefix
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argument causes us to read a file name and use that file as the inbox.

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If the variable `rmail-preserve-inbox' is non-nil, new mail will
always be left in inbox files rather than deleted.

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This function runs `rmail-get-new-mail-hook' before saving the updated file.
It returns t if it got any new messages."
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  (interactive
   (list (if current-prefix-arg
	     (read-file-name "Get new mail from file: "))))
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  (run-hooks 'rmail-before-get-new-mail-hook)
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  ;; If the disk file has been changed from under us,
  ;; revert to it before we get new mail.
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  (or (verify-visited-file-modtime (current-buffer))
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      (find-file (buffer-file-name)))
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  (rmail-maybe-set-message-counters)
  (widen)
  ;; Get rid of all undo records for this buffer.
  (or (eq buffer-undo-list t)
      (setq buffer-undo-list nil))
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  (let ((all-files (if file-name (list file-name)
		     rmail-inbox-list)))
    (unwind-protect
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	(let (found)
	  (while all-files
	    (let ((opoint (point))
		  (new-messages 0)
		  (delete-files ())
		  ;; If buffer has not changed yet, and has not been saved yet,
		  ;; don't replace the old backup file now.
		  (make-backup-files (and make-backup-files (buffer-modified-p)))
		  (buffer-read-only nil)
		  ;; Don't make undo records for what we do in getting mail.
		  (buffer-undo-list t)
		  success
		  ;; Files to insert this time around.
		  files
		  ;; Last names of those files.
		  file-last-names)
	      ;; Pull files off all-files onto files
	      ;; as long as there is no name conflict.
	      ;; A conflict happens when two inbox file names
	      ;; have the same last component.
	      (while (and all-files
			  (not (member (file-name-nondirectory (car all-files))
				       file-last-names)))
		(setq files (cons (car all-files) files)
		      file-last-names
		      (cons (file-name-nondirectory (car all-files)) files))
		(setq all-files (cdr all-files)))
	      ;; Put them back in their original order.
	      (setq files (nreverse files))

	      (goto-char (point-max))
	      (skip-chars-backward " \t\n") ; just in case of brain damage
	      (delete-region (point) (point-max)) ; caused by require-final-newline
	      (save-excursion
		(save-restriction
		  (narrow-to-region (point) (point))
		  ;; Read in the contents of the inbox files,
		  ;; renaming them as necessary,
		  ;; and adding to the list of files to delete eventually.
		  (if file-name
		      (rmail-insert-inbox-text files nil)
		    (setq delete-files (rmail-insert-inbox-text files t)))
		  ;; Scan the new text and convert each message to babyl format.
		  (goto-char (point-min))
		  (unwind-protect
		      (save-excursion
			(setq new-messages (rmail-convert-to-babyl-format)
			      success t))
		    ;; If we could not convert the file's inboxes,
		    ;; rename the files we tried to read
		    ;; so we won't over and over again.
		    (if (and (not file-name) (not success))
			(let ((delfiles delete-files)
			      (count 0))
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			  ;; Try to delete the garbage just inserted.
			  (delete-region (point-min) (point-max))
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			  (while delfiles
			    (while (file-exists-p (format "RMAILOSE.%d" count))
			      (setq count (1+ count)))
			    (rename-file (car delfiles)
					 (format "RMAILOSE.%d" count))
			    (setq delfiles (cdr delfiles))))))
		  (or (zerop new-messages)
		      (let (success)
			(widen)
			(search-backward "\n\^_" nil t)
			(narrow-to-region (point) (point-max))
			(goto-char (1+ (point-min)))
			(rmail-count-new-messages)
			(run-hooks 'rmail-get-new-mail-hook)
			(save-buffer)))
		  ;; Delete the old files, now that babyl file is saved.
		  (while delete-files
		    (condition-case ()
			;; First, try deleting.
			(condition-case ()
			    (delete-file (car delete-files))