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|
;;; mailalias.el --- expand mailing address aliases defined in ~/.mailrc.
;; Copyright (C) 1985, 1987 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 2, 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; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; Basic functions for defining and expanding mail aliases.
;; These seal off the interface to the alias-definition parts of a
;; .mailrc file formatted for BSD's Mail or USL's mailx.
;;; Code:
(defvar mail-aliases t
"Alias of mail address aliases,
or t meaning should be initialized from `~/.mailrc'.")
;; Called from sendmail-send-it, or similar functions,
;; only if some mail aliases are defined.
(defun expand-mail-aliases (beg end &optional exclude)
"Expand all mail aliases in suitable header fields found between BEG and END.
Suitable header fields are `To', `Cc' and `Bcc' and their `Resent-' variants.
Optional second arg EXCLUDE may be a regular expression defining text to be
removed from alias expansions."
(if (eq mail-aliases t)
(progn (setq mail-aliases nil) (build-mail-aliases)))
(goto-char beg)
(setq end (set-marker (make-marker) end))
(let ((case-fold-search nil))
(while (let ((case-fold-search t))
(re-search-forward "^\\(to\\|cc\\|bcc\\|resent-to\\|resent-cc\\|resent-bcc\\):" end t))
(skip-chars-forward " \t")
(let ((beg1 (point))
end1 pos epos seplen
;; DISABLED-ALIASES records aliases temporarily disabled
;; while we scan text that resulted from expanding those aliases.
;; Each element is (ALIAS . TILL-WHEN), where TILL-WHEN
;; is where to reenable the alias (expressed as number of chars
;; counting from END1).
(disabled-aliases nil))
(re-search-forward "^[^ \t]" end 'move)
(beginning-of-line)
(skip-chars-backward " \t\n")
(setq end1 (point-marker))
(goto-char beg1)
(while (< (point) end1)
(setq pos (point))
;; Reenable any aliases which were disabled for ranges
;; that we have passed out of.
(while (and disabled-aliases (> pos (- end1 (cdr (car disabled-aliases)))))
(setq disabled-aliases (cdr disabled-aliases)))
;; EPOS gets position of end of next name;
;; SEPLEN gets length of whitespace&separator that follows it.
(if (re-search-forward "[ \t]*[\n,][ \t]*" end1 t)
(setq epos (match-beginning 0)
seplen (- (point) epos))
(setq epos (marker-position end1) seplen 0))
(let (translation
(string (buffer-substring pos epos)))
(if (and (not (assoc string disabled-aliases))
(setq translation
(cdr (assoc string mail-aliases))))
(progn
;; This name is an alias. Disable it.
(setq disabled-aliases (cons (cons string (- end1 epos))
disabled-aliases))
;; Replace the alias with its expansion
;; then rescan the expansion for more aliases.
(goto-char pos)
(insert translation)
(if exclude
(let ((regexp
(concat "\\b\\(" exclude "\\)\\b"))
(end (point-marker)))
(goto-char pos)
(while (re-search-forward regexp end t)
(replace-match ""))
(goto-char end)))
(delete-region (point) (+ (point) (- epos pos)))
(goto-char pos))
;; Name is not an alias. Skip to start of next name.
(goto-char epos)
(forward-char seplen))))
(set-marker end1 nil)))
(set-marker end nil)))
;; Called by mail-setup, or similar functions, only if ~/.mailrc exists.
(defun build-mail-aliases (&optional file)
"Read mail aliases from `~/.mailrc' and set `mail-aliases'."
(setq file (expand-file-name (or file (or (getenv "MAILRC") "~/.mailrc"))))
(let ((buffer nil)
(obuf (current-buffer)))
(unwind-protect
(progn
(setq buffer (generate-new-buffer "mailrc"))
(buffer-disable-undo buffer)
(set-buffer buffer)
(while file
(cond ((get-file-buffer file)
(insert (save-excursion
(set-buffer (get-file-buffer file))
(buffer-substring (point-min) (point-max)))))
((file-exists-p file) (insert-file-contents file))
((file-exists-p (setq file (concat "~/" file)))
(insert-file-contents file))
(t (setq file nil)))
;; Don't lose if no final newline.
(goto-char (point-max))
(or (eq (preceding-char) ?\n) (newline))
(goto-char (point-min))
;; handle "\\\n" continuation lines
(while (not (eobp))
(end-of-line)
(if (= (preceding-char) ?\\)
(progn (delete-char -1) (delete-char 1) (insert ?\ ))
(forward-char 1)))
(goto-char (point-min))
;; handle `source' directives -- Eddy/1994/May/25
(cond ((re-search-forward "^source[ \t]+" nil t)
(re-search-forward "\\S-+")
(setq file
(buffer-substring (match-beginning 0) (match-end 0)))
(beginning-of-line)
(insert "# ") ; to ensure we don't re-process this file
(beginning-of-line))
(t (setq file nil))))
(goto-char (point-min))
(while (or (re-search-forward "^a\\(lias\\|\\)[ \t]+" nil t)
(re-search-forward "^g\\(roup\\|\\)[ \t]+" nil t))
(re-search-forward "[^ \t]+")
(let* ((name (buffer-substring (match-beginning 0) (match-end 0)))
(start (progn (skip-chars-forward " \t") (point))))
(end-of-line)
(define-mail-alias
name
(buffer-substring start (point))
t)))
mail-aliases)
(if buffer (kill-buffer buffer))
(set-buffer obuf))))
;; Always autoloadable in case the user wants to define aliases
;; interactively or in .emacs.
;;;###autoload
(defun define-mail-alias (name definition &optional from-mailrc-file)
"Define NAME as a mail alias that translates to DEFINITION.
This means that sending a message to NAME will actually send to DEFINITION.
DEFINITION can be one or more mail addresses separated by spaces.
An address can contain spaces if it is quoted with double-quotes."
(interactive "sDefine mail alias: \nsDefine %s as mail alias for: ")
;; Read the defaults first, if we have not done so.
(if (eq mail-aliases t)
(progn
(setq mail-aliases nil)
(if (file-exists-p "~/.mailrc")
(build-mail-aliases))))
;; strip garbage from front and end
(if (string-match "\\`[ \t\n,]+" definition)
(setq definition (substring definition (match-end 0))))
(if (string-match "[ \t\n,]+\\'" definition)
(setq definition (substring definition 0 (match-beginning 0))))
(let ((result '())
(start 0)
(L (length definition))
end tem)
(while start
;; If we're reading from the mailrc file, then addresses are delimited
;; by spaces, and addresses with embedded spaces must be surrounded by
;; double-quotes. Otherwise, addresses are separated by commas.
(if from-mailrc-file
(if (eq ?\" (aref definition start))
(setq start (1+ start)
end (string-match "\"[ \t,]*" definition start))
(setq end (string-match "[ \t,]+" definition start)))
(setq end (string-match "[ \t\n,]*,[ \t\n,]*" definition start)))
(setq result (cons (substring definition start end) result))
(setq start (and end
(/= (match-end 0) L)
(match-end 0))))
(setq definition (mapconcat (function identity)
(nreverse result)
", "))
(setq tem (assoc name mail-aliases))
(if tem
(rplacd tem definition)
(setq mail-aliases (cons (cons name definition) mail-aliases)))))
(provide 'mailalias)
;;; mailalias.el ends here
|
