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253 lines
8.7 KiB
EmacsLisp
253 lines
8.7 KiB
EmacsLisp
;;; mail-utils.el --- utility functions used both by rmail and rnews
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;; Copyright (C) 1985 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: mail, news
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; 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.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; 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
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; Utility functions for mail and netnews handling. These handle fine
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;; points of header parsing.
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;;; Code:
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;;; We require lisp-mode to make sure that lisp-mode-syntax-table has
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;;; been initialized.
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(require 'lisp-mode)
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;;;###autoload
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(defvar mail-use-rfc822 nil "\
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*If non-nil, use a full, hairy RFC822 parser on mail addresses.
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Otherwise, (the default) use a smaller, somewhat faster, and
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often correct parser.")
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;; Returns t if file FILE is an Rmail file.
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;;;###autoload
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(defun mail-file-babyl-p (file)
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(let ((buf (generate-new-buffer " *rmail-file-p*")))
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(unwind-protect
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(save-excursion
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(set-buffer buf)
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(insert-file-contents file nil 0 100)
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(looking-at "BABYL OPTIONS:"))
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(kill-buffer buf))))
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(defun mail-string-delete (string start end)
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"Returns a string containing all of STRING except the part
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from START (inclusive) to END (exclusive)."
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(if (null end) (substring string 0 start)
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(concat (substring string 0 start)
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(substring string end nil))))
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(defun mail-strip-quoted-names (address)
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"Delete comments and quoted strings in an address list ADDRESS.
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Also delete leading/trailing whitespace and replace FOO <BAR> with just BAR.
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Return a modified address list."
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(if (null address)
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nil
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(if mail-use-rfc822
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(progn (require 'rfc822)
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(mapconcat 'identity (rfc822-addresses address) ", "))
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(let (pos)
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(string-match "\\`[ \t\n]*" address)
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;; strip surrounding whitespace
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(setq address (substring address
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(match-end 0)
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(string-match "[ \t\n]*\\'" address
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(match-end 0))))
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;; Detect nested comments.
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(if (string-match "[ \t]*(\\([^)\"\\]\\|\\\\.\\|\\\\\n\\)*(" address)
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;; Strip nested comments.
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(save-excursion
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(set-buffer (get-buffer-create " *temp*"))
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(erase-buffer)
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(insert address)
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(set-syntax-table lisp-mode-syntax-table)
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(goto-char 1)
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(while (search-forward "(" nil t)
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(forward-char -1)
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(skip-chars-backward " \t")
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(delete-region (point)
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(save-excursion
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(condition-case ()
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(forward-sexp 1)
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(error (goto-char (point-max))))
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(point))))
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(setq address (buffer-string))
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(erase-buffer))
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;; Strip non-nested comments an easier way.
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(while (setq pos (string-match
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;; This doesn't hack rfc822 nested comments
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;; `(xyzzy (foo) whinge)' properly. Big deal.
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"[ \t]*(\\([^)\"\\]\\|\\\\.\\|\\\\\n\\)*)"
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address))
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(setq address
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(mail-string-delete address
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pos (match-end 0)))))
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;; strip `quoted' names (This is supposed to hack `"Foo Bar" <bar@host>')
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(setq pos 0)
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(while (setq pos (string-match
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"[ \t]*\"\\([^\"\\]\\|\\\\.\\|\\\\\n\\)*\"[ \t\n]*"
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address pos))
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;; If the next thing is "@", we have "foo bar"@host. Leave it.
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(if (and (> (length address) (match-end 0))
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(= (aref address (match-end 0)) ?@))
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(setq pos (match-end 0))
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(setq address
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(mail-string-delete address
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pos (match-end 0)))))
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;; Retain only part of address in <> delims, if there is such a thing.
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(while (setq pos (string-match "\\(,\\s-*\\|\\`\\)[^,]*<\\([^>,]*>\\)"
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address))
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(let ((junk-beg (match-end 1))
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(junk-end (match-beginning 2))
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(close (match-end 0)))
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(setq address (mail-string-delete address (1- close) close))
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(setq address (mail-string-delete address junk-beg junk-end))))
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address))))
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(or (and (boundp 'rmail-default-dont-reply-to-names)
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(not (null rmail-default-dont-reply-to-names)))
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(setq rmail-default-dont-reply-to-names "info-"))
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; rmail-dont-reply-to-names is defined in loaddefs
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(defun rmail-dont-reply-to (userids)
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"Returns string of mail addresses USERIDS sans any recipients
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that start with matches for `rmail-dont-reply-to-names'.
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Usenet paths ending in an element that matches are removed also."
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(if (null rmail-dont-reply-to-names)
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(setq rmail-dont-reply-to-names
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(concat (if rmail-default-dont-reply-to-names
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(concat rmail-default-dont-reply-to-names "\\|")
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"")
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(concat (regexp-quote (user-login-name))
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"\\>"))))
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(let ((match (concat "\\(^\\|,\\)[ \t\n]*\\([^,\n]*!\\|\\)\\("
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rmail-dont-reply-to-names
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"\\)"))
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(case-fold-search t)
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pos epos)
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(while (setq pos (string-match match userids))
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(if (> pos 0) (setq pos (1+ pos)))
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(setq epos
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(if (string-match "[ \t\n,]+" userids (match-end 0))
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(match-end 0)
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(length userids)))
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(setq userids
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(mail-string-delete
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userids pos epos)))
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;; get rid of any trailing commas
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(if (setq pos (string-match "[ ,\t\n]*\\'" userids))
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(setq userids (substring userids 0 pos)))
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;; remove leading spaces. they bother me.
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(if (string-match "\\s *" userids)
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(substring userids (match-end 0))
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userids)))
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;;;###autoload
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(defun mail-fetch-field (field-name &optional last all)
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"Return the value of the header field FIELD-NAME.
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The buffer is expected to be narrowed to just the headers of the message.
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If second arg LAST is non-nil, use the last such field if there are several.
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If third arg ALL is non-nil, concatenate all such fields with commas between."
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(save-excursion
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(goto-char (point-min))
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(let ((case-fold-search t)
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(name (concat "^" (regexp-quote field-name) "[ \t]*:[ \t]*")))
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(if all
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(let ((value ""))
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(while (re-search-forward name nil t)
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(let ((opoint (point)))
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(while (progn (forward-line 1)
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(looking-at "[ \t]")))
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;; Back up over newline, then trailing spaces or tabs
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(forward-char -1)
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(while (member (preceding-char) '(? ?\t))
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(forward-char -1))
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(setq value (concat value
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(if (string= value "") "" ", ")
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(buffer-substring-no-properties
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opoint (point))))))
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(and (not (string= value "")) value))
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(if (re-search-forward name nil t)
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(progn
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(if last (while (re-search-forward name nil t)))
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(let ((opoint (point)))
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(while (progn (forward-line 1)
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(looking-at "[ \t]")))
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;; Back up over newline, then trailing spaces or tabs
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(forward-char -1)
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(while (member (preceding-char) '(? ?\t))
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(forward-char -1))
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(buffer-substring-no-properties opoint (point)))))))))
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;; Parse a list of tokens separated by commas.
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;; It runs from point to the end of the visible part of the buffer.
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;; Whitespace before or after tokens is ignored,
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;; but whitespace within tokens is kept.
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(defun mail-parse-comma-list ()
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(let (accumulated
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beg)
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(skip-chars-forward " ")
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(while (not (eobp))
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(setq beg (point))
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(skip-chars-forward "^,")
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(skip-chars-backward " ")
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(setq accumulated
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(cons (buffer-substring beg (point))
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accumulated))
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(skip-chars-forward "^,")
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(skip-chars-forward ", "))
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accumulated))
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(defun mail-comma-list-regexp (labels)
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(let (pos)
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(setq pos (or (string-match "[^ \t]" labels) 0))
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;; Remove leading and trailing whitespace.
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(setq labels (substring labels pos (string-match "[ \t]*$" labels pos)))
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;; Change each comma to \|, and flush surrounding whitespace.
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(while (setq pos (string-match "[ \t]*,[ \t]*" labels))
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(setq labels
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(concat (substring labels 0 pos)
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"\\|"
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(substring labels (match-end 0))))))
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labels)
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(defun mail-rfc822-time-zone (time)
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(let* ((sec (or (car (current-time-zone time)) 0))
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(absmin (/ (abs sec) 60)))
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(format "%c%02d%02d" (if (< sec 0) ?- ?+) (/ absmin 60) (% absmin 60))))
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(defun mail-rfc822-date ()
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(let* ((time (current-time))
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(s (current-time-string time)))
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(string-match "[^ ]+ +\\([^ ]+\\) +\\([^ ]+\\) \\([^ ]+\\) \\([^ ]+\\)" s)
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(concat (substring s (match-beginning 2) (match-end 2)) " "
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(substring s (match-beginning 1) (match-end 1)) " "
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(substring s (match-beginning 4) (match-end 4)) " "
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(substring s (match-beginning 3) (match-end 3)) " "
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(mail-rfc822-time-zone time))))
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(provide 'mail-utils)
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;;; mail-utils.el ends here
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