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emacs/lisp/mail/mailalias.el
Richard M. Stallman e694581dc0 (mail-complete-style): New variable. 
(mail-complete): Use that.
(mail-get-names): Store full names in cdrs of mail-names elts.
(mail-names): Doc fix.
(mail-directory): Minor cleanup.
1997-04-05 21:57:48 +00:00

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EmacsLisp
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;;; mailalias.el --- expand and complete mailing address aliases
;; Copyright (C) 1985, 1987, 1995, 1996, 1997 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, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, 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:
(require 'sendmail)
(defvar mail-names t
"Alist of local users, aliases and directory entries as available.
Elements have the form (MAILNAME) or (MAILNAME . FULLNAME).
If the value means t, it means the real value should be calculated
for the next use. this is used in `mail-complete'.")
(defvar mail-local-names t
"Alist of local users.
When t this still needs to be initialized.")
(defvar mail-passwd-files '("/etc/passwd")
"List of files from which to determine valid user names.")
(defvar mail-passwd-command nil
"Shell command to retrieve text to add to `/etc/passwd', or nil.")
(defvar mail-directory-names t
"Alist of mail address directory entries.
When t this still needs to be initialized.")
(defvar mail-address-field-regexp
"^\\(Resent-\\)?\\(To\\|From\\|CC\\|BCC\\|Reply-to\\):")
(defvar mail-complete-alist
`((,mail-address-field-regexp mail-get-names pattern)
("Newsgroups:" . (if (boundp 'gnus-active-hashtb)
gnus-active-hashtb
(if (boundp news-group-article-assoc)
news-group-article-assoc)))
("Followup-To:" . (mail-sentto-newsgroups))
;;("Distribution:" ???)
)
"Alist of header field and expression to return alist for completion.
Expression may reference variable `pattern' which is the string being completed.
If not on matching header, `mail-complete-function' gets called instead.")
;;;###autoload
(defvar mail-complete-style 'angles
"*Specifies how \\[mail-complete] formats the full name when it completes.
If `nil', they contain just the return address like:
king@grassland.com
If `parens', they look like:
king@grassland.com (Elvis Parsley)
If `angles', they look like:
Elvis Parsley <king@grassland.com>")
(defvar mail-complete-function 'ispell-complete-word
"Function to call when completing outside `mail-complete-alist'-header.")
(defvar mail-directory-function nil
"Function to get completions from directory service or `nil' for none.
See `mail-directory-requery'.")
;; This is for when the directory is huge, or changes frequently.
(defvar mail-directory-requery nil
"When non-`nil' call `mail-directory-function' for each completion.
In that case, one argument gets passed to the function, the partial string
entered so far.")
(defvar mail-directory-process nil
"Unix command when `mail-directory-function' is `mail-directory-process'.
This is a list of the form (COMMAND ARG ...), where each of the list elements
is evaluated. When `mail-directory-requery' is non-`nil', during
evaluation the variable `pattern' contains the partial input being completed.
This might look like
'(remote-shell-program \"HOST\" \"-nl\" \"USER\" \"COMMAND\")
or
'(remote-shell-program \"HOST\" \"-n\" \"COMMAND '^\" pattern \"'\")")
(defvar mail-directory-stream ()
"List of (HOST SERVICE) for stream connection to mail directory.")
(defvar mail-directory-parser nil
"How to interpret the output of `mail-directory-function'.
Three types of values are possible:
- nil means to gather each line as one name
- regexp means first \\(grouping\\) in successive matches is name
- function called at beginning of buffer that returns an alist of names")
;; 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', `From', `CC' and `BCC', `Reply-to', and
their `Resent-' variants.
Optional second arg EXCLUDE may be a regular expression defining text to be
removed from alias expansions."
(sendmail-sync-aliases)
(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 mail-address-field-regexp 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-no-properties 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 the file specified
;; by mail-personal-alias-file (usually `~/.mailrc') exists.
(defun build-mail-aliases (&optional file)
"Read mail aliases from personal aliases file and set `mail-aliases'.
By default, this is the file specified by `mail-personal-alias-file'."
(setq file (expand-file-name (or file mail-personal-alias-file)))
(let ((buffer nil)
(obuf (current-buffer)))
(unwind-protect
(progn
(setq buffer (generate-new-buffer " mailrc"))
(set-buffer buffer)
(while file
(cond ((get-file-buffer file)
(insert (save-excursion
(set-buffer (get-file-buffer file))
(buffer-substring-no-properties
(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-no-properties
(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 (re-search-forward
"^\\(a\\|alias\\|g\\|group\\)[ \t]+\\([^ \t]+\\)" nil t)
(let* ((name (match-string 2))
(start (progn (skip-chars-forward " \t") (point))))
(end-of-line)
(define-mail-alias
name
(buffer-substring-no-properties 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.
Normally, the addresses in DEFINITION must be separated by commas.
If FROM-MAILRC-FILE is non-nil, then addresses in DEFINITION
can be 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.
(sendmail-sync-aliases)
(if (eq mail-aliases t)
(progn
(setq mail-aliases nil)
(if (file-exists-p mail-personal-alias-file)
(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 '())
;; If DEFINITION is null string, avoid looping even once.
(start (and (not (equal definition "")) 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)
mail-names t))))
;;;###autoload
(defun mail-complete (arg)
"Perform completion on header field or word preceding point.
Completable headers are according to `mail-complete-alist'. If none matches
current header, calls `mail-complete-function' and passes prefix arg if any."
(interactive "P")
;; Read the defaults first, if we have not done so.
(sendmail-sync-aliases)
(if (eq mail-aliases t)
(progn
(setq mail-aliases nil)
(if (file-exists-p mail-personal-alias-file)
(build-mail-aliases))))
(let ((list mail-complete-alist))
(if (and (save-excursion (search-forward
(concat "\n" mail-header-separator "\n")
nil t))
(save-excursion
(if (re-search-backward "^[^\t]" nil t)
(while list
(if (looking-at (car (car list)))
(setq arg (cdr (car list))
list ())
(setq list (cdr list)))))
arg))
(let* ((end (point))
(beg (save-excursion
(skip-chars-backward "^ \t<,:")
(point)))
(pattern (buffer-substring beg end))
completion)
(setq list (eval arg)
completion (try-completion pattern list))
(cond ((eq completion t))
((null completion)
(message "Can't find completion for \"%s\"" pattern)
(ding))
((not (string= pattern completion))
(delete-region beg end)
(let ((alist-elt (assoc completion mail-names)))
(if (cdr alist-elt)
(cond ((eq mail-complete-style 'parens)
(insert completion " (" (cdr alist-elt) ")"))
((eq mail-complete-style 'angles)
(insert (cdr alist-elt) " <" completion ">"))
(t
(insert completion)))
(insert completion))))
(t
(message "Making completion list...")
(with-output-to-temp-buffer "*Completions*"
(display-completion-list
(all-completions pattern list)))
(message "Making completion list...%s" "done"))))
(funcall mail-complete-function arg))))
(defun mail-get-names (pattern)
"Fetch local users and global mail addresses for completion.
Consults `/etc/passwd' and a directory service if one is set up via
`mail-directory-function'.
PATTERN is the string we want to complete."
(if (eq mail-local-names t)
(save-excursion
(set-buffer (generate-new-buffer " passwd"))
(let ((files mail-passwd-files))
(while files
(insert-file-contents (car files) nil nil nil t)
(setq files (cdr files))))
(if mail-passwd-command
(call-process shell-file-name nil t nil
shell-command-switch mail-passwd-command))
(beginning-of-buffer)
(setq mail-local-names nil)
(while (not (eobp))
;;Recognize lines like
;; nobody:*:65534:65534::/:
;; +demo::::::/bin/csh
;; +ethanb
;;while skipping
;; +@SOFTWARE
;; The second \(...\) matches the user id.
(if (looking-at "\\+?\\([^:@\n+]+\\):[^:\n]*:\\([^\n:]*\\):")
(add-to-list 'mail-local-names
(cons (match-string 1)
(user-full-name
(string-to-int (match-string 2))))))
(beginning-of-line 2))
(kill-buffer (current-buffer))))
(if (or (eq mail-names t)
(eq mail-directory-names t))
(let (directory)
(and mail-directory-function
(eq mail-directory-names t)
(setq directory
(mail-directory (if mail-directory-requery pattern))))
(or mail-directory-requery
(setq mail-directory-names directory))
(if (or directory
(eq mail-names t))
(setq mail-names
(sort (append (if (consp mail-aliases)
(mapcar
(function (lambda (a) (list (car a))))
mail-aliases))
(if (consp mail-local-names)
mail-local-names)
(or directory mail-directory-names))
(lambda (a b)
;; should cache downcased strings
(string< (downcase (car a))
(downcase (car b)))))))))
mail-names)
(defun mail-directory (pattern)
"Call directory to get names matching PATTERN or all if `nil'.
Calls `mail-directory-function' and applies `mail-directory-parser' to output."
(save-excursion
(message "Querying directory...")
(set-buffer (generate-new-buffer " *mail-directory*"))
(funcall mail-directory-function pattern)
(goto-char 1)
(let (directory)
(if (stringp mail-directory-parser)
(while (re-search-forward mail-directory-parser nil t)
(setq directory
(cons (match-string 1) directory)))
(if mail-directory-parser
(setq directory (funcall mail-directory-parser))
(while (not (eobp))
(setq directory
(cons (buffer-substring (point)
(progn
(forward-line)
(if (bolp)
(1- (point))
(point))))
directory)))))
(kill-buffer (current-buffer))
(message "Querying directory...done")
directory)))
(defun mail-directory-process (pattern)
"Call a Unix process to output names in directory.
See `mail-directory-process'."
(apply 'call-process (eval (car mail-directory-process)) nil t nil
(mapcar 'eval (cdr mail-directory-process))))
;; This should handle a dialog. Currently expects port to spit out names.
(defun mail-directory-stream (pattern)
"Open a stream to retrieve names in directory.
See `mail-directory-stream'."
(let (mailalias-done)
(set-process-sentinel
(apply 'open-network-stream "mailalias" (current-buffer)
mail-directory-stream)
(lambda (x x)
(setq mailalias-done t)))
(while (not mailalias-done)
(sit-for .1))))
(defun mail-sentto-newsgroups ()
"Return all entries from Newsgroups: header as completion alist."
(save-excursion
(if (mail-position-on-field "newsgroups" t)
(let ((point (point))
list)
(while (< (skip-chars-backward "^:, \t\n") 0)
(setq list `((,(buffer-substring (point) point))
,@list))
(skip-chars-backward ", \t\n")
(setq point (point)))
list))))
(provide 'mailalias)
;;; mailalias.el ends here
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