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;;; mailclient.el --- mail sending via system's mail client. -*- lexical-binding: t; -*-
;; Copyright (C) 2005-2021 Free Software Foundation, Inc.
;; Author: David Reitter <david.reitter@gmail.com>
;; Keywords: mail
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This package allows handing over a buffer to be sent off
;; via the system's designated e-mail client.
;; Note that the e-mail client will display the contents of the buffer
;; again for editing.
;; The e-mail client is taken to be whoever handles a mailto: URL
;; via `browse-url'.
;; Mailto: URLs are composed according to RFC2368.
;; MIME bodies are not supported - we rather expect the mail client
;; to encode the body and add, for example, a digital signature.
;; The mailto URL RFC calls for "short text messages that are
;; actually the content of automatic processing."
;; So mailclient.el is ideal for situations where an e-mail is
;; generated automatically, and the user can edit it in the
;; mail client (e.g. bug-reports).
;; To activate:
;; (setq send-mail-function 'mailclient-send-it) ; if you use `mail'
;;; Code:
(require 'sendmail) ;; for mail-sendmail-undelimit-header
(require 'mail-utils) ;; for mail-fetch-field
(require 'browse-url)
(require 'mail-parse)
(defcustom mailclient-place-body-on-clipboard-flag
(fboundp 'w32-set-clipboard-data)
"If non-nil, put the e-mail body on the clipboard in mailclient.
This is useful on systems where only short mailto:// URLs are
supported. Defaults to non-nil on Windows, nil otherwise."
:type 'boolean
:group 'mail)
(defun mailclient-encode-string-as-url (string)
"Convert STRING to a URL, using utf-8 as encoding."
(apply (function concat)
(mapcar
(lambda (char)
(cond
((eq char ?\n) "%0D%0A") ;; newline
((string-match "[-a-zA-Z0-9._~]" (char-to-string char))
(char-to-string char)) ;; unreserved as per RFC 6068
(t ;; everything else
(format "%%%02x" char)))) ;; escape
;; Convert string to list of chars
(append (encode-coding-string string 'utf-8)))))
(defvar mailclient-delim-static "?")
(defun mailclient-url-delim ()
(let ((current mailclient-delim-static))
(setq mailclient-delim-static "&")
current))
(defun mailclient-gather-addresses (str &optional drop-first-name)
(let ((field (mail-fetch-field str nil t)))
(if field
(save-excursion
(let ((first t)
(result ""))
(mapc
(lambda (recp)
(setq result
(concat
result
(if (and drop-first-name
first)
""
(concat (mailclient-url-delim) str "="))
(mailclient-encode-string-as-url
recp)))
(setq first nil))
(split-string
(mail-strip-quoted-names field) ", *"))
result)))))
(declare-function clipboard-kill-ring-save "menu-bar.el"
(beg end &optional region))
;;;###autoload
(defun mailclient-send-it ()
"Pass current buffer on to the system's mail client.
Suitable value for `send-mail-function'.
The mail client is taken to be the handler of mailto URLs."
(require 'mail-utils)
(let ((case-fold-search nil)
delimline
(mailbuf (current-buffer)))
(unwind-protect
(with-temp-buffer
(insert-buffer-substring mailbuf)
;; Move to header delimiter
(mail-sendmail-undelimit-header)
(setq delimline (point-marker))
(if mail-aliases
(expand-mail-aliases (point-min) delimline))
(goto-char (point-min))
;; ignore any blank lines in the header
(while (and (re-search-forward "\n\n\n*" delimline t)
(< (point) delimline))
(replace-match "\n"))
(let ((case-fold-search t)
(mime-charset-pattern
(concat
"^content-type:[ \t]*text/plain;"
"\\(?:[ \t\n]*\\(?:format\\|delsp\\)=\"?[-a-z0-9]+\"?;\\)*"
"[ \t\n]*charset=\"?\\([^ \t\n\";]+\\)\"?"))
coding-system
character-coding
;; Use the external browser function to send the
;; message.
(browse-url-default-handlers nil))
;; initialize limiter
(setq mailclient-delim-static "?")
;; construct and call up mailto URL
(browse-url
(concat
(save-excursion
(narrow-to-region (point-min) delimline)
;; We can't send multipart/* messages (i. e. with
;; attachments or the like) via this method.
(when-let ((type (mail-fetch-field "content-type")))
(when (and (string-match "multipart"
(car (mail-header-parse-content-type
type)))
(not (y-or-n-p "Message with attachments can't be sent via mailclient; continue anyway?")))
(error "Choose a different `send-mail-function' to send attachments")))
(goto-char (point-min))
(setq coding-system
(if (re-search-forward mime-charset-pattern nil t)
(coding-system-from-name (match-string 1))
'undecided))
(setq character-coding
(mail-fetch-field "content-transfer-encoding"))
(when character-coding
(setq character-coding (downcase character-coding)))
(concat
"mailto:"
;; Some of the headers according to RFC 822 (or later).
(mailclient-gather-addresses "To"
'drop-first-name)
(mailclient-gather-addresses "cc" )
(mailclient-gather-addresses "bcc" )
(mailclient-gather-addresses "Resent-To" )
(mailclient-gather-addresses "Resent-cc" )
(mailclient-gather-addresses "Resent-bcc" )
(mailclient-gather-addresses "Reply-To" )
;; The From field is not honored for now: it's
;; not necessarily configured. The mail client
;; knows the user's address(es)
;; (mailclient-gather-addresses "From" )
;; subject line
(let ((subj (mail-fetch-field "Subject" nil t)))
(widen) ;; so we can read the body later on
(if subj ;; if non-blank
;; the mail client will deal with
;; warning the user etc.
(concat (mailclient-url-delim) "subject="
(mailclient-encode-string-as-url subj))
""))))
;; body
(mailclient-url-delim) "body="
(progn
(delete-region (point-min) delimline)
(unless (null character-coding)
;; mailto: and clipboard need UTF-8 and cannot deal with
;; Content-Transfer-Encoding or Content-Type.
;; FIXME: There is code duplication here with rmail.el.
(set-buffer-multibyte nil)
(cond
((string= character-coding "base64")
(base64-decode-region (point-min) (point-max)))
((string= character-coding "quoted-printable")
(mail-unquote-printable-region (point-min) (point-max)
nil nil t))
(t (error "unsupported Content-Transfer-Encoding: %s"
character-coding)))
(decode-coding-region (point-min) (point-max) coding-system))
(mailclient-encode-string-as-url
(if mailclient-place-body-on-clipboard-flag
(progn
(clipboard-kill-ring-save (point-min) (point-max))
(concat
"*** E-Mail body has been placed on clipboard, "
"please paste it here! ***"))
(buffer-string)))))))))))
(provide 'mailclient)
;;; mailclient.el ends here
|
