notmuch-draft.el (10751B)
1 ;;; notmuch-draft.el --- functions for postponing and editing drafts -*- lexical-binding: t -*- 2 ;; 3 ;; Copyright © Mark Walters 4 ;; Copyright © David Bremner 5 ;; Copyright © Leo Gaspard 6 ;; 7 ;; This file is part of Notmuch. 8 ;; 9 ;; Notmuch is free software: you can redistribute it and/or modify it 10 ;; under the terms of the GNU General Public License as published by 11 ;; the Free Software Foundation, either version 3 of the License, or 12 ;; (at your option) any later version. 13 ;; 14 ;; Notmuch is distributed in the hope that it will be useful, but 15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of 16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 ;; General Public License for more details. 18 ;; 19 ;; You should have received a copy of the GNU General Public License 20 ;; along with Notmuch. If not, see <https://www.gnu.org/licenses/>. 21 ;; 22 ;; Authors: Mark Walters <markwalters1009@gmail.com> 23 ;; David Bremner <david@tethera.net> 24 ;; Leo Gaspard <leo@gaspard.io> 25 26 ;;; Code: 27 28 (require 'cl-lib) 29 (require 'pcase) 30 (require 'subr-x) 31 32 (require 'notmuch-maildir-fcc) 33 (require 'notmuch-tag) 34 35 (declare-function notmuch-show-get-message-id "notmuch-show" (&optional bare)) 36 (declare-function notmuch-message-mode "notmuch-mua") 37 38 ;;; Options 39 40 (defgroup notmuch-draft nil 41 "Saving and editing drafts in Notmuch." 42 :group 'notmuch) 43 44 (defcustom notmuch-draft-tags '("+draft") 45 "List of tag changes to apply when saving a draft message in the database. 46 47 Tags starting with \"+\" (or not starting with either \"+\" or 48 \"-\") in the list will be added, and tags starting with \"-\" 49 will be removed from the message being stored. 50 51 For example, if you wanted to give the message a \"draft\" tag 52 but not the (normally added by default) \"inbox\" tag, you would 53 set: 54 (\"+draft\" \"-inbox\")" 55 :type '(repeat string) 56 :group 'notmuch-draft) 57 58 (defcustom notmuch-draft-folder "drafts" 59 "Folder to save draft messages in. 60 61 This should be specified relative to the root of the notmuch 62 database. It will be created if necessary." 63 :type 'string 64 :group 'notmuch-draft) 65 66 (defcustom notmuch-draft-quoted-tags '() 67 "Mml tags to quote. 68 69 This should be a list of mml tags to quote before saving. You do 70 not need to include \"secure\" as that is handled separately. 71 72 If you include \"part\" then attachments will not be saved with 73 the draft -- if not then they will be saved with the draft. The 74 former means the attachments may not still exist when you resume 75 the message, the latter means that the attachments as they were 76 when you postponed will be sent with the resumed message. 77 78 Note you may get strange results if you change this between 79 postponing and resuming a message." 80 :type '(repeat string) 81 :group 'notmuch-send) 82 83 (defcustom notmuch-draft-save-plaintext 'ask 84 "Whether to allow saving plaintext when it seems encryption is intended. 85 When a message contains mml tags, then that suggest it is 86 intended to be encrypted. If the user requests that such a 87 message is saved locally, then this option controls whether 88 that is allowed. Beside a boolean, this can also be `ask'." 89 :type '(radio 90 (const :tag "Never" nil) 91 (const :tag "Ask every time" ask) 92 (const :tag "Always" t)) 93 :group 'notmuch-draft 94 :group 'notmuch-crypto) 95 96 ;;; Internal 97 98 (defvar notmuch-draft-encryption-tag-regex 99 "<#\\(part encrypt\\|secure.*mode=.*encrypt>\\)" 100 "Regular expression matching mml tags indicating encryption of part or message.") 101 102 (defvar-local notmuch-draft-id nil 103 "Message-id of the most recent saved draft of this message.") 104 105 (defun notmuch-draft--mark-deleted () 106 "Tag the last saved draft deleted. 107 108 Used when a new version is saved, or the message is sent." 109 (when notmuch-draft-id 110 (notmuch-tag notmuch-draft-id '("+deleted")))) 111 112 (defun notmuch-draft-quote-some-mml () 113 "Quote the mml tags in `notmuch-draft-quoted-tags'." 114 (save-excursion 115 ;; First we deal with any secure tag separately. 116 (message-goto-body) 117 (when (looking-at "<#secure[^\n]*>\n") 118 (let ((secure-tag (match-string 0))) 119 (delete-region (match-beginning 0) (match-end 0)) 120 (message-add-header (concat "X-Notmuch-Emacs-Secure: " secure-tag)))) 121 ;; This is copied from mml-quote-region but only quotes the 122 ;; specified tags. 123 (when notmuch-draft-quoted-tags 124 (let ((re (concat "<#!*/?\\(" 125 (mapconcat 'regexp-quote notmuch-draft-quoted-tags "\\|") 126 "\\)"))) 127 (message-goto-body) 128 (while (re-search-forward re nil t) 129 ;; Insert ! after the #. 130 (goto-char (+ (match-beginning 0) 2)) 131 (insert "!")))))) 132 133 (defun notmuch-draft-unquote-some-mml () 134 "Unquote the mml tags in `notmuch-draft-quoted-tags'." 135 (save-excursion 136 (when notmuch-draft-quoted-tags 137 (let ((re (concat "<#!+/?\\(" 138 (mapconcat 'regexp-quote notmuch-draft-quoted-tags "\\|") 139 "\\)"))) 140 (message-goto-body) 141 (while (re-search-forward re nil t) 142 ;; Remove one ! from after the #. 143 (goto-char (+ (match-beginning 0) 2)) 144 (delete-char 1)))) 145 (let (secure-tag) 146 (save-restriction 147 (message-narrow-to-headers) 148 (setq secure-tag (message-fetch-field "X-Notmuch-Emacs-Secure" t)) 149 (message-remove-header "X-Notmuch-Emacs-Secure")) 150 (message-goto-body) 151 (when secure-tag 152 (insert secure-tag "\n"))))) 153 154 (defun notmuch-draft--has-encryption-tag () 155 "Return non-nil if there is an mml secure tag." 156 (save-excursion 157 (message-goto-body) 158 (re-search-forward notmuch-draft-encryption-tag-regex nil t))) 159 160 (defun notmuch-draft--query-encryption () 161 "Return non-nil if we should save a message that should be encrypted. 162 163 `notmuch-draft-save-plaintext' controls the behaviour." 164 (cl-case notmuch-draft-save-plaintext 165 ((ask) 166 (unless (yes-or-no-p 167 "(Customize `notmuch-draft-save-plaintext' to avoid this warning) 168 This message contains mml tags that suggest it is intended to be encrypted. 169 Really save and index an unencrypted copy? ") 170 (error "Save aborted"))) 171 ((nil) 172 (error "Refusing to save draft with encryption tags (see `%s')" 173 'notmuch-draft-save-plaintext)) 174 ((t) 175 (ignore)))) 176 177 (defun notmuch-draft--make-message-id () 178 ;; message-make-message-id gives the id inside a "<" ">" pair, 179 ;; but notmuch doesn't want that form, so remove them. 180 (concat "draft-" (substring (message-make-message-id) 1 -1))) 181 182 ;;; Commands 183 184 (defun notmuch-draft-save () 185 "Save the current draft message in the notmuch database. 186 187 This saves the current message in the database with tags 188 `notmuch-draft-tags' (in addition to any default tags 189 applied to newly inserted messages)." 190 (interactive) 191 (when (notmuch-draft--has-encryption-tag) 192 (notmuch-draft--query-encryption)) 193 (let ((id (notmuch-draft--make-message-id))) 194 (with-temporary-notmuch-message-buffer 195 ;; We insert a Date header and a Message-ID header, the former 196 ;; so that it is easier to search for the message, and the 197 ;; latter so we have a way of accessing the saved message (for 198 ;; example to delete it at a later time). We check that the 199 ;; user has these in `message-deletable-headers' (the default) 200 ;; as otherwise they are doing something strange and we 201 ;; shouldn't interfere. Note, since we are doing this in a new 202 ;; buffer we don't change the version in the compose buffer. 203 (cond 204 ((member 'Message-ID message-deletable-headers) 205 (message-remove-header "Message-ID") 206 (message-add-header (concat "Message-ID: <" id ">"))) 207 (t 208 (message "You have customized emacs so Message-ID is not a %s" 209 "deletable header, so not changing it") 210 (setq id nil))) 211 (cond 212 ((member 'Date message-deletable-headers) 213 (message-remove-header "Date") 214 (message-add-header (concat "Date: " (message-make-date)))) 215 (t 216 (message "You have customized emacs so Date is not a deletable %s" 217 "header, so not changing it"))) 218 (message-add-header "X-Notmuch-Emacs-Draft: True") 219 (notmuch-draft-quote-some-mml) 220 (notmuch-maildir-setup-message-for-saving) 221 (notmuch-maildir-notmuch-insert-current-buffer 222 notmuch-draft-folder t notmuch-draft-tags)) 223 ;; We are now back in the original compose buffer. Note the 224 ;; function notmuch-call-notmuch-process (called by 225 ;; notmuch-maildir-notmuch-insert-current-buffer) signals an error 226 ;; on failure, so to get to this point it must have 227 ;; succeeded. Also, notmuch-draft-id is still the id of the 228 ;; previous draft, so it is safe to mark it deleted. 229 (notmuch-draft--mark-deleted) 230 (setq notmuch-draft-id (concat "id:" id)) 231 (set-buffer-modified-p nil))) 232 233 (defun notmuch-draft-postpone () 234 "Save the draft message in the notmuch database and exit buffer." 235 (interactive) 236 (notmuch-draft-save) 237 (kill-buffer)) 238 239 (defun notmuch-draft-resume (id) 240 "Resume editing of message with id ID." 241 ;; Used by command `notmuch-show-resume-message'. 242 (let* ((tags (notmuch--process-lines notmuch-command "search" "--output=tags" 243 "--exclude=false" id)) 244 (draft (equal tags (notmuch-update-tags tags notmuch-draft-tags)))) 245 (when (or draft 246 (yes-or-no-p "Message does not appear to be a draft: edit as new? ")) 247 (pop-to-buffer-same-window 248 (get-buffer-create (concat "*notmuch-draft-" id "*"))) 249 (setq buffer-read-only nil) 250 (erase-buffer) 251 (let ((coding-system-for-read 'no-conversion)) 252 (notmuch--call-process notmuch-command nil t nil "show" "--format=raw" id)) 253 (mime-to-mml) 254 (goto-char (point-min)) 255 (when (re-search-forward "^$" nil t) 256 (replace-match mail-header-separator t t)) 257 ;; Remove the Date and Message-ID headers (unless the user has 258 ;; explicitly customized emacs to tell us not to) as they will 259 ;; be replaced when the message is sent. 260 (save-restriction 261 (message-narrow-to-headers) 262 (when (member 'Message-ID message-deletable-headers) 263 (message-remove-header "Message-ID")) 264 (when (member 'Date message-deletable-headers) 265 (message-remove-header "Date")) 266 (unless draft (notmuch-fcc-header-setup)) 267 ;; The X-Notmuch-Emacs-Draft header is a more reliable 268 ;; indication of whether the message really is a draft. 269 (setq draft (> (message-remove-header "X-Notmuch-Emacs-Draft") 0))) 270 ;; If the message is not a draft we should not unquote any mml. 271 (when draft 272 (notmuch-draft-unquote-some-mml)) 273 (notmuch-message-mode) 274 (message-goto-body) 275 (set-buffer-modified-p nil) 276 ;; If the resumed message was a draft then set the draft 277 ;; message-id so that we can delete the current saved draft if the 278 ;; message is resaved or sent. 279 (setq notmuch-draft-id (and draft id))))) 280 281 ;;; _ 282 283 (add-hook 'message-send-hook 'notmuch-draft--mark-deleted) 284 285 (provide 'notmuch-draft) 286 287 ;;; notmuch-draft.el ends here