605 lines
24 KiB
EmacsLisp
605 lines
24 KiB
EmacsLisp
;;; mu4e-draft.el -- part of mu4e, the mu mail user agent for emacs -*- lexical-binding: t -*-
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;;
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;; Copyright (C) 2011-2020 Dirk-Jan C. Binnema
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;; Author: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
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;; Maintainer: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
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;; This file is not part of GNU Emacs.
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;; mu4e 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 3 of the License, or
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;; (at your option) any later version.
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;; mu4e 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 mu4e. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; In this file, various functions to create draft messages
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;;; Code:
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(require 'cl-lib)
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(require 'mu4e-vars)
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(require 'mu4e-utils)
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(require 'mu4e-message)
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(require 'message) ;; mail-header-separator
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;;; Options
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(defcustom mu4e-compose-dont-reply-to-self nil
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"If non-nil, don't include self.
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(as decided by `mu4e-personal-address-p')"
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:type 'boolean
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:group 'mu4e-compose)
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(defcustom mu4e-compose-cite-function
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(or message-cite-function 'message-cite-original-without-signature)
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"The function for citing message in replies and forwards.
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This is the mu4e-specific version of
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`message-cite-function'."
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:type 'function
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:group 'mu4e-compose)
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(defcustom mu4e-compose-signature
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(or message-signature "Sent with my mu4e")
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"The message signature.
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\(i.e. the blob at the bottom of messages). This is the
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mu4e-specific version of `message-signature'."
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:type '(choice string
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(const :tag "None" nil)
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(const :tag "Contents of signature file" t)
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function sexp)
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:risky t
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:group 'mu4e-compose)
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(defcustom mu4e-compose-signature-auto-include t
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"Whether to automatically include a message-signature."
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:type 'boolean
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:group 'mu4e-compose)
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(make-obsolete-variable 'mu4e-compose-auto-include-date
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"This is done unconditionally now" "1.3.5")
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(defcustom mu4e-compose-in-new-frame nil
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"Whether to compose messages in a new frame."
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:type 'boolean
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:group 'mu4e-compose)
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(defvar mu4e-user-agent-string
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(format "mu4e %s; emacs %s" mu4e-mu-version emacs-version)
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"The User-Agent string for mu4e, or nil.")
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(defvar mu4e-view-date-format)
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(defun mu4e~draft-cite-original (msg)
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"Return a cited version of the original message MSG as a plist.
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This function uses `mu4e-compose-cite-function', and as such all
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its settings apply."
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(with-temp-buffer
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(when (fboundp 'mu4e-view-message-text) ;; keep bytecompiler happy
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(let ((mu4e-view-date-format "%Y-%m-%dT%T%z"))
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(insert (mu4e-view-message-text msg)))
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(message-yank-original)
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(goto-char (point-min))
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(push-mark (point-max))
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;; set the the signature separator to 'loose', since in the real world,
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;; many message don't follow the standard...
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(let ((message-signature-separator "^-- *$")
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(message-signature-insert-empty-line t))
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(funcall mu4e-compose-cite-function))
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(pop-mark)
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(goto-char (point-min))
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(buffer-string))))
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(defun mu4e~draft-header (hdr val)
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"Return a header line of the form \"HDR: VAL\".
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If VAL is nil, return nil."
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;; note: the propertize here is currently useless, since gnus sets its own
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;; later.
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(when val (format "%s: %s\n"
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(propertize hdr 'face 'mu4e-header-key-face)
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(propertize val 'face 'mu4e-header-value-face))))
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(defconst mu4e~max-reference-num 21
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"Specifies the maximum number of References:.
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As suggested by `message-shorten-references'.")
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(defun mu4e~shorten-1 (list cut surplus)
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"Cut SURPLUS elements out of LIST.
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Beginning with CUTth
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one. Code borrowed from `message-shorten-1'."
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(setcdr (nthcdr (- cut 2) list)
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(nthcdr (+ (- cut 2) surplus 1) list)))
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(defun mu4e~draft-references-construct (msg)
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"Construct the value of the References: header based on MSG.
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This assumes a comma-separated string. Normally, this the concatenation of the
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existing References + In-Reply-To (which may be empty, an note
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that :references includes the old in-reply-to as well) and the
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message-id. If the message-id is empty, returns the old
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References. If both are empty, return nil."
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(let* ( ;; these are the ones from the message being replied to / forwarded
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(refs (mu4e-message-field msg :references))
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(msgid (mu4e-message-field msg :message-id))
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;; now, append in
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(refs (if (and msgid (not (string= msgid "")))
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(append refs (list msgid)) refs))
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;; no doubles
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(refs (cl-delete-duplicates refs :test #'equal))
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(refnum (length refs))
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(cut 2))
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;; remove some refs when there are too many
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(when (> refnum mu4e~max-reference-num)
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(let ((surplus (- refnum mu4e~max-reference-num)))
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(mu4e~shorten-1 refs cut surplus)))
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(mapconcat (lambda (id) (format "<%s>" id)) refs " ")))
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;;; Determine the recipient fields for new messages
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(defun mu4e~draft-recipients-list-to-string (lst)
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"Convert a lst LST of address cells into a string.
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This is specified as a comma-separated list of e-mail addresses.
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If LST is nil, returns nil."
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(when lst
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(mapconcat
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(lambda (addrcell)
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(let ((name (car addrcell))
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(email (cdr addrcell)))
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(if name
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(format "%s <%s>" (mu4e~rfc822-quoteit name) email)
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(format "%s" email))))
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lst ", ")))
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(defun mu4e~draft-address-cell-equal (cell1 cell2)
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"Return t if CELL1 and CELL2 have the same e-mail address.
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The comparison is done case-insensitively. If the cells done
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match return nil. CELL1 and CELL2 are cons cells of the
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form (NAME . EMAIL)."
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(string=
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(downcase (or (cdr cell1) ""))
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(downcase (or (cdr cell2) ""))))
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(defun mu4e~draft-create-to-lst (origmsg)
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"Create a list of address for the To: in a new message.
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This is based on the original message ORIGMSG. If the Reply-To
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address is set, use that, otherwise use the From address. Note,
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whatever was in the To: field before, goes to the Cc:-list (if
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we're doing a reply-to-all). Special case: if we were the sender
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of the original, we simple copy the list form the original."
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(let ((reply-to
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(or (plist-get origmsg :reply-to) (plist-get origmsg :from))))
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(cl-delete-duplicates reply-to :test #'mu4e~draft-address-cell-equal)
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(if mu4e-compose-dont-reply-to-self
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(cl-delete-if
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(lambda (to-cell)
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(mu4e-personal-address-p (cdr to-cell)))
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reply-to)
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reply-to)))
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(defun mu4e~strip-ignored-addresses (addrs)
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"Return all addresses that are not to be ignored.
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I.e. return all the addresses in ADDRS not matching
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`mu4e-compose-reply-ignore-address'."
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(cond
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((null mu4e-compose-reply-ignore-address)
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addrs)
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((functionp mu4e-compose-reply-ignore-address)
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(cl-remove-if
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(lambda (elt)
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(funcall mu4e-compose-reply-ignore-address (cdr elt)))
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addrs))
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(t
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;; regexp or list of regexps
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(let* ((regexp mu4e-compose-reply-ignore-address)
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(regexp (if (listp regexp)
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(mapconcat (lambda (elt) (concat "\\(" elt "\\)"))
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regexp "\\|")
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regexp)))
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(cl-remove-if
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(lambda (elt)
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(string-match regexp (cdr elt)))
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addrs)))))
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(defun mu4e~draft-create-cc-lst (origmsg &optional reply-all include-from)
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"Create a list of address for the Cc: in a new message.
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This is based on the original message ORIGMSG, and whether it's a
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REPLY-ALL."
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(when reply-all
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(let* ((cc-lst ;; get the cc-field from the original, remove dups
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(cl-delete-duplicates
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(append
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(plist-get origmsg :to)
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(plist-get origmsg :cc)
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(when include-from(plist-get origmsg :from))
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(plist-get origmsg :list-post))
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:test #'mu4e~draft-address-cell-equal))
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;; now we have the basic list, but we must remove
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;; addresses also in the To: list
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(cc-lst
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(cl-delete-if
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(lambda (cc-cell)
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(cl-find-if
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(lambda (to-cell)
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(mu4e~draft-address-cell-equal cc-cell to-cell))
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(mu4e~draft-create-to-lst origmsg)))
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cc-lst))
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;; remove ignored addresses
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(cc-lst (mu4e~strip-ignored-addresses cc-lst))
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;; finally, we need to remove ourselves from the cc-list
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;; unless mu4e-compose-keep-self-cc is non-nil
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(cc-lst
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(if (or mu4e-compose-keep-self-cc (null user-mail-address))
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cc-lst
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(cl-delete-if
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(lambda (cc-cell)
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(mu4e-personal-address-p (cdr cc-cell)))
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cc-lst))))
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cc-lst)))
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(defun mu4e~draft-recipients-construct (field origmsg &optional reply-all include-from)
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"Create value (a string) for the recipient FIELD.
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\(which is a symbol, :to or :cc), based on the original message ORIGMSG,
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and (optionally) REPLY-ALL which indicates this is a reply-to-all
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message. Return nil if there are no recipients for the particular field."
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(mu4e~draft-recipients-list-to-string
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(cl-case field
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(:to
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(mu4e~draft-create-to-lst origmsg))
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(:cc
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(mu4e~draft-create-cc-lst origmsg reply-all include-from))
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(otherwise
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(mu4e-error "Unsupported field")))))
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;;; RFC2822 handling of phrases in mail-addresses
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;;
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;; The optional display-name contains a phrase, it sits before the
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;; angle-addr as specified in RFC2822 for email-addresses in header
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;; fields. Contributed by jhelberg.
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(defun mu4e~rfc822-phrase-type (ph)
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"Return an atom or quoted-string for the phrase PH.
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This checks for empty string first. Then quotes around the phrase
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\(returning 'rfc822-quoted-string). Then whether there is a quote
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inside the phrase (returning 'rfc822-containing-quote).
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The reverse of the RFC atext definition is then tested.
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If it matches, nil is returned, if not, it is an 'rfc822-atom, which
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is returned."
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(cond
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((= (length ph) 0) 'rfc822-empty)
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((= (aref ph 0) ?\")
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(if (string-match "\"\\([^\"\\\n]\\|\\\\.\\|\\\\\n\\)*\"" ph)
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'rfc822-quoted-string
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'rfc822-containing-quote)) ; starts with quote, but doesn't end with one
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((string-match-p "[\"]" ph) 'rfc822-containing-quote)
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((string-match-p "[\000-\037()\*<>@,;:\\\.]+" ph) nil)
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(t 'rfc822-atom)))
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(defun mu4e~rfc822-quoteit (ph)
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"Quote an RFC822 phrase PH only if necessary.
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Atoms and quoted strings don't need quotes. The rest do. In
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case a phrase contains a quote, it will be escaped."
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(let ((type (mu4e~rfc822-phrase-type ph)))
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(cond
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((eq type 'rfc822-atom) ph)
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((eq type 'rfc822-quoted-string) ph)
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((eq type 'rfc822-containing-quote)
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(format "\"%s\""
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(replace-regexp-in-string "\"" "\\\\\"" ph)))
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(t (format "\"%s\"" ph)))))
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(defun mu4e~draft-from-construct ()
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"Construct a value for the From:-field of the reply.
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This is based on the variable `user-full-name' and
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`user-mail-address'; if the latter is nil, function returns nil."
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(when user-mail-address
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(if user-full-name
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(format "%s <%s>" (mu4e~rfc822-quoteit user-full-name) user-mail-address)
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(format "%s" user-mail-address))))
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;;; Header separators
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(defun mu4e~draft-insert-mail-header-separator ()
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"Insert `mail-header-separator' in the first empty line of the message.
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`message-mode' needs this line to know where the headers end and
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the body starts. Note, in `mu4e-compose-mode', we use
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`before-save-hook' and `after-save-hook' to ensure that this
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separator is never written to the message file. Also see
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`mu4e-remove-mail-header-separator'."
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;; we set this here explicitly, since (as it has happened) a wrong
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;; value for this (such as "") breaks address completion and other things
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(set (make-local-variable 'mail-header-separator) "--text follows this line--")
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(put 'mail-header-separator 'permanent-local t)
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(save-excursion
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;; make sure there's not one already
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(mu4e~draft-remove-mail-header-separator)
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(let ((sepa (propertize mail-header-separator
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'intangible t
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;; don't make this read-only, message-mode
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;; seems to require it being writable in some cases
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;;'read-only "Can't touch this"
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'rear-nonsticky t
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'font-lock-face 'mu4e-compose-separator-face)))
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(widen)
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;; search for the first empty line
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(goto-char (point-min))
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(if (search-forward-regexp "^$" nil t)
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(progn
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(replace-match sepa)
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;; `message-narrow-to-headers` searches for a
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;; `mail-header-separator` followed by a new line. Therefore, we
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;; must insert a newline if on the last line of the buffer.
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(when (= (point) (point-max))
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(insert "\n")))
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(progn ;; no empty line? then prepend one
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(goto-char (point-max))
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(insert "\n" sepa))))))
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(defun mu4e~draft-remove-mail-header-separator ()
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"Remove `mail-header-separator'.
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We do this before saving a
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file (and restore it afterwards), to ensure that the separator
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never hits the disk. Also see
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`mu4e~draft-insert-mail-header-separator."
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(save-excursion
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(widen)
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(goto-char (point-min))
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;; remove the --text follows this line-- separator
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(when (search-forward-regexp (concat "^" mail-header-separator) nil t)
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(let ((inhibit-read-only t))
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(replace-match "")))))
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(defun mu4e~draft-reply-all-p (origmsg)
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"Ask user whether she wants to reply to *all* recipients.
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If there is just one recipient of ORIGMSG do nothing."
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(let* ((recipnum
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(+ (length (mu4e~draft-create-to-lst origmsg))
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(length (mu4e~draft-create-cc-lst origmsg t))))
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(response
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(if (< recipnum 2)
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'all ;; with less than 2 recipients, we can reply to 'all'
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(mu4e-read-option
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"Reply to "
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`( (,(format "all %d recipients" recipnum) . all)
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("sender only" . sender-only))))))
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(eq response 'all)))
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(defun mu4e~draft-message-filename-construct (&optional flagstr)
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"Construct a randomized name for a message file with flags FLAGSTR.
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It looks something like
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<time>-<random>.<hostname>:2,
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You can append flags."
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(let* ((sysname (if (fboundp 'system-name)
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(system-name)
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(with-no-warnings system-name)))
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(sysname (if (string= sysname "") "localhost" sysname))
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(hostname (downcase
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(save-match-data
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(substring sysname
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(string-match "^[^.]+" sysname)
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(match-end 0))))))
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(format "%s.%04x%04x%04x%04x.%s%s2,%s"
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(format-time-string "%s" (current-time))
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(random 65535) (random 65535) (random 65535) (random 65535)
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hostname mu4e-maildir-info-delimiter (or flagstr ""))))
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(defun mu4e~draft-common-construct ()
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"Construct the common headers for each message."
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(concat
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(when mu4e-user-agent-string
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(mu4e~draft-header "User-agent" mu4e-user-agent-string))
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(mu4e~draft-header "Date" (message-make-date))))
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(defconst mu4e~draft-reply-prefix "Re: "
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"String to prefix replies with.")
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(defun mu4e~draft-reply-construct-recipients (origmsg)
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"Determine the to/cc recipients for a reply message."
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(let* ((reply-to-self (mu4e-message-contact-field-matches-me origmsg :from))
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;; reply-to-self implies reply-all
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(reply-all (or reply-to-self
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(eq mu4e-compose-reply-recipients 'all)
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(and (not (eq mu4e-compose-reply-recipients 'sender))
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(mu4e~draft-reply-all-p origmsg)))))
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(concat
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(if reply-to-self
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;; When we're replying to ourselves, simply keep the same headers.
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(concat
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(mu4e~draft-header "To" (mu4e~draft-recipients-list-to-string
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(mu4e-message-field origmsg :to)))
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(mu4e~draft-header "Cc" (mu4e~draft-recipients-list-to-string
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(mu4e-message-field origmsg :cc))))
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;; if there's no-one in To, copy the CC-list
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(if (zerop (length (mu4e~draft-create-to-lst origmsg)))
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(mu4e~draft-header "To" (mu4e~draft-recipients-construct
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:cc origmsg reply-all))
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;; otherwise...
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(concat
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(mu4e~draft-header "To" (mu4e~draft-recipients-construct :to origmsg))
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(mu4e~draft-header "Cc" (mu4e~draft-recipients-construct :cc origmsg reply-all))))))))
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(defun mu4e~draft-reply-construct-recipients-list (origmsg)
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"Determine the to/cc recipients for a reply message to a
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mailing-list."
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(let* ( ;; reply-to-self implies reply-all
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(list-post (plist-get origmsg :list-post))
|
||
(from (plist-get origmsg :from))
|
||
(recipnum
|
||
(+ (length (mu4e~draft-create-to-lst origmsg))
|
||
(length (mu4e~draft-create-cc-lst origmsg t t))))
|
||
(reply-type
|
||
(mu4e-read-option
|
||
"Reply to mailing-list "
|
||
`( (,(format "all %d recipient(s)" recipnum) . all)
|
||
(,(format "list-only (%s)" (cdar list-post)) . list-only)
|
||
(,(format "sender-only (%s)" (cdar from)) . sender-only)))))
|
||
(cl-case reply-type
|
||
(all
|
||
(concat
|
||
(mu4e~draft-header "To" (mu4e~draft-recipients-construct :to origmsg))
|
||
(mu4e~draft-header "Cc" (mu4e~draft-recipients-construct :cc origmsg t t))))
|
||
(list-only
|
||
(mu4e~draft-header "To"
|
||
(mu4e~draft-recipients-list-to-string list-post)))
|
||
(sender-only
|
||
(mu4e~draft-header "To"
|
||
(mu4e~draft-recipients-list-to-string from))))))
|
||
|
||
(defun mu4e~draft-reply-construct (origmsg)
|
||
"Create a draft message as a reply to ORIGMSG.
|
||
Replying-to-self is special; in that case, the To and Cc fields
|
||
will be the same as in the original."
|
||
(let* ((old-msgid (plist-get origmsg :message-id))
|
||
(subject (concat mu4e~draft-reply-prefix
|
||
(message-strip-subject-re
|
||
(or (plist-get origmsg :subject) ""))))
|
||
(list-post (plist-get origmsg :list-post)))
|
||
(concat
|
||
(mu4e~draft-header "From" (or (mu4e~draft-from-construct) ""))
|
||
(mu4e~draft-header "Reply-To" mu4e-compose-reply-to-address)
|
||
|
||
(if list-post ;; mailing-lists are a bit special.
|
||
(mu4e~draft-reply-construct-recipients-list origmsg)
|
||
(mu4e~draft-reply-construct-recipients origmsg))
|
||
|
||
(mu4e~draft-header "Subject" subject)
|
||
(mu4e~draft-header "References"
|
||
(mu4e~draft-references-construct origmsg))
|
||
(mu4e~draft-common-construct)
|
||
(when old-msgid
|
||
(mu4e~draft-header "In-reply-to" (format "<%s>" old-msgid)))
|
||
"\n\n"
|
||
(mu4e~draft-cite-original origmsg))))
|
||
|
||
(defconst mu4e~draft-forward-prefix "Fwd: "
|
||
"String to prefix replies with.")
|
||
|
||
(defun mu4e~draft-forward-construct (origmsg)
|
||
"Create a draft forward message for original message ORIGMSG."
|
||
(let ((subject
|
||
(or (plist-get origmsg :subject) "")))
|
||
(concat
|
||
(mu4e~draft-header "From" (or (mu4e~draft-from-construct) ""))
|
||
(mu4e~draft-header "Reply-To" mu4e-compose-reply-to-address)
|
||
(mu4e~draft-header "To" "")
|
||
(mu4e~draft-common-construct)
|
||
(mu4e~draft-header "References"
|
||
(mu4e~draft-references-construct origmsg))
|
||
(mu4e~draft-header "Subject"
|
||
(concat
|
||
;; if there's no Fwd: yet, prepend it
|
||
(if (string-match "^Fwd:" subject)
|
||
""
|
||
mu4e~draft-forward-prefix)
|
||
subject))
|
||
(unless mu4e-compose-forward-as-attachment
|
||
(concat
|
||
"\n\n"
|
||
(mu4e~draft-cite-original origmsg))))))
|
||
|
||
(defun mu4e~draft-newmsg-construct ()
|
||
"Create a new message."
|
||
(concat
|
||
(mu4e~draft-header "From" (or (mu4e~draft-from-construct) ""))
|
||
(mu4e~draft-header "Reply-To" mu4e-compose-reply-to-address)
|
||
(mu4e~draft-header "To" "")
|
||
(mu4e~draft-header "Subject" "")
|
||
(mu4e~draft-common-construct)))
|
||
|
||
(defvar mu4e~draft-drafts-folder nil
|
||
"The drafts-folder for this compose buffer.
|
||
This is based on `mu4e-drafts-folder', which is evaluated once.")
|
||
|
||
(defun mu4e~draft-open-file (path switch-function)
|
||
"Open the the draft file at PATH."
|
||
(let ((buf (find-file-noselect path)))
|
||
(funcall (or
|
||
switch-function
|
||
(and mu4e-compose-in-new-frame 'switch-to-buffer-other-frame)
|
||
'switch-to-buffer)
|
||
buf)))
|
||
|
||
|
||
(defun mu4e~draft-determine-path (draft-dir)
|
||
"Determines the path for a new draft file in DRAFT-DIR."
|
||
(format "%s/%s/cur/%s"
|
||
(mu4e-root-maildir) draft-dir (mu4e~draft-message-filename-construct "DS")))
|
||
|
||
|
||
(defun mu4e-draft-open (compose-type &optional msg switch-function)
|
||
"Open a draft file for a message MSG.
|
||
In case of a new message (when COMPOSE-TYPE is `reply', `forward'
|
||
or `new'), open an existing draft (when COMPOSE-TYPE is `edit'),
|
||
or re-send an existing message (when COMPOSE-TYPE is `resend').
|
||
|
||
The name of the draft folder is constructed from the
|
||
concatenation of `(mu4e-root-maildir)' and `mu4e-drafts-folder' (the
|
||
latter will be evaluated). The message file name is a unique name
|
||
determined by `mu4e-send-draft-file-name'. The initial contents
|
||
will be created from either `mu4e~draft-reply-construct', or
|
||
`mu4e~draft-forward-construct' or `mu4e~draft-newmsg-construct'."
|
||
(let ((draft-dir nil))
|
||
(cl-case compose-type
|
||
|
||
(edit
|
||
;; case-1: re-editing a draft messages. in this case, we do know the
|
||
;; full path, but we cannot really know 'drafts folder'... we make a
|
||
;; guess
|
||
(setq draft-dir (mu4e~guess-maildir (mu4e-message-field msg :path)))
|
||
(mu4e~draft-open-file (mu4e-message-field msg :path) switch-function))
|
||
|
||
(resend
|
||
;; case-2: copy some exisisting message to a draft message, then edit
|
||
;; that.
|
||
(setq draft-dir (mu4e~guess-maildir (mu4e-message-field msg :path)))
|
||
(let ((draft-path (mu4e~draft-determine-path draft-dir)))
|
||
(copy-file (mu4e-message-field msg :path) draft-path)
|
||
(mu4e~draft-open-file draft-path switch-function)))
|
||
|
||
((reply forward new)
|
||
;; case-3: creating a new message; in this case, we can determine
|
||
;; mu4e-get-drafts-folder
|
||
(setq draft-dir (mu4e-get-drafts-folder msg))
|
||
(let ((draft-path (mu4e~draft-determine-path draft-dir))
|
||
(initial-contents
|
||
(cl-case compose-type
|
||
(reply (mu4e~draft-reply-construct msg))
|
||
(forward (mu4e~draft-forward-construct msg))
|
||
(new (mu4e~draft-newmsg-construct)))))
|
||
(mu4e~draft-open-file draft-path switch-function)
|
||
(insert initial-contents)
|
||
(newline)
|
||
;; include the message signature (if it's set)
|
||
(if (and mu4e-compose-signature-auto-include mu4e-compose-signature)
|
||
(let ((message-signature mu4e-compose-signature))
|
||
(save-excursion
|
||
(message-insert-signature)
|
||
(mu4e~fontify-signature))))))
|
||
(t (mu4e-error "Unsupported compose-type %S" compose-type)))
|
||
;; if we didn't find a draft folder yet, try some default
|
||
(unless draft-dir
|
||
(setq draft-dir (mu4e-get-drafts-folder msg)))
|
||
;; evaluate mu4e~drafts-drafts-folder once, here, and use that value
|
||
;; throughout.
|
||
(set (make-local-variable 'mu4e~draft-drafts-folder) draft-dir)
|
||
(put 'mu4e~draft-drafts-folder 'permanent-local t)
|
||
(unless mu4e~draft-drafts-folder
|
||
(mu4e-error "Failed to determine drafts folder"))))
|
||
|
||
;;; _
|
||
(provide 'mu4e-draft)
|
||
;;; mu4e-draft.el ends here
|