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   1 ;;; notmuch-address.el --- address completion with notmuch
   2 ;;
   3 ;; Copyright © David Edmondson
   4 ;;
   5 ;; This file is part of Notmuch.
   6 ;;
   7 ;; Notmuch is free software: you can redistribute it and/or modify it
   8 ;; under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation, either version 3 of the License, or
  10 ;; (at your option) any later version.
  11 ;;
  12 ;; Notmuch is distributed in the hope that it will be useful, but
  13 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 ;; General Public License for more details.
  16 ;;
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with Notmuch.  If not, see <https://www.gnu.org/licenses/>.
  19 ;;
  20 ;; Authors: David Edmondson <dme@dme.org>
  21
  22 ;;; Code:
  23
  24 (require 'message)
  25 (require 'notmuch-parser)
  26 (require 'notmuch-lib)
  27 (require 'notmuch-company)
  28 ;;
  29 (declare-function company-manual-begin "company")
  30
  31 (defvar notmuch-address-last-harvest 0
  32   "Time of last address harvest.")
  33
  34 (defvar notmuch-address-completions (make-hash-table :test 'equal)
  35   "Hash of email addresses for completion during email composition.
  36 This variable is set by calling `notmuch-address-harvest'.")
  37
  38 (defvar notmuch-address-full-harvest-finished nil
  39   "t indicates that full completion address harvesting has been
  40 finished. Use notmuch-address--harvest-ready to access as that
  41 will load a saved hash if necessary (and available).")
  42
  43 (defun notmuch-address--harvest-ready ()
  44   "Return t if there is a full address hash available.
  45
  46 If the hash is not present it attempts to load a saved hash."
  47   (or notmuch-address-full-harvest-finished
  48       (notmuch-address--load-address-hash)))
  49
  50 (defcustom notmuch-address-command 'internal
  51   "Determines how address completion candidates are generated.
  52
  53 If it is a string then that string should be an external program
  54 which must take a single argument (searched string) and output a
  55 list of completion candidates, one per line.
  56
  57 Alternatively, it can be the symbol 'internal, in which case
  58 internal completion is used; the variable
  59 `notmuch-address-internal-completion` can be used to customize
  60 this case.
  61
  62 Finally, if this variable is nil then address completion is
  63 disabled."
  64   :type '(radio
  65           (const :tag "Use internal address completion" internal)
  66           (const :tag "Disable address completion" nil)
  67           (string :tag "Use external completion command"))
  68   :group 'notmuch-send
  69   :group 'notmuch-address
  70   :group 'notmuch-external)
  71
  72 (defcustom notmuch-address-internal-completion '(sent nil)
  73   "Determines how internal address completion generates candidates.
  74
  75 This should be a list of the form '(DIRECTION FILTER), where
  76 DIRECTION is either sent or received and specifies whether the
  77 candidates are searched in messages sent by the user or received
  78 by the user (note received by is much faster), and FILTER is
  79 either nil or a filter-string, such as \"date:1y..\" to append
  80 to the query."
  81   :type '(list :tag "Use internal address completion"
  82                (radio
  83                 :tag "Base completion on messages you have"
  84                 :value sent
  85                 (const :tag "sent (more accurate)" sent)
  86                 (const :tag "received (faster)" received))
  87                (radio :tag "Filter messages used for completion"
  88                       (const :tag "Use all messages" nil)
  89                       (string :tag "Filter query")))
  90   ;; We override set so that we can clear the cache when this changes
  91   :set (lambda (symbol value)
  92          (set-default symbol value)
  93          (setq notmuch-address-last-harvest 0)
  94          (setq notmuch-address-completions (clrhash notmuch-address-completions))
  95          (setq notmuch-address-full-harvest-finished nil))
  96   :group 'notmuch-send
  97   :group 'notmuch-address
  98   :group 'notmuch-external)
  99
 100 (defcustom notmuch-address-save-filename nil
 101   "Filename to save the cached completion addresses.
 102
 103 All the addresses notmuch uses for address completion will be
 104 cached in this file. This has obvious privacy implications so you
 105 should make sure it is not somewhere publicly readable."
 106   :type '(choice (const :tag "Off" nil)
 107                  (file :tag "Filename"))
 108   :group 'notmuch-send
 109   :group 'notmuch-address
 110   :group 'notmuch-external)
 111
 112 (defcustom notmuch-address-selection-function 'notmuch-address-selection-function
 113   "The function to select address from given list. The function is
 114 called with PROMPT, COLLECTION, and INITIAL-INPUT as arguments
 115 (subset of what `completing-read' can be called with).
 116 While executed the value of `completion-ignore-case' is t.
 117 See documentation of function `notmuch-address-selection-function'
 118 to know how address selection is made by default."
 119   :type 'function
 120   :group 'notmuch-send
 121   :group 'notmuch-address
 122   :group 'notmuch-external)
 123
 124 (defcustom notmuch-address-post-completion-functions nil
 125   "Functions called after completing address.
 126
 127 The completed address is passed as an argument to each function.
 128 Note that this hook will be invoked for completion in headers
 129 matching `notmuch-address-completion-headers-regexp'."
 130   :type 'hook
 131   :group 'notmuch-address
 132   :group 'notmuch-hooks)
 133
 134 (defun notmuch-address-selection-function (prompt collection initial-input)
 135   "Call (`completing-read'
 136       PROMPT COLLECTION nil nil INITIAL-INPUT 'notmuch-address-history)"
 137   (completing-read
 138    prompt collection nil nil initial-input 'notmuch-address-history))
 139
 140 (defvar notmuch-address-completion-headers-regexp
 141   "^\\(Resent-\\)?\\(To\\|B?Cc\\|Reply-To\\|From\\|Mail-Followup-To\\|Mail-Copies-To\\):")
 142
 143 (defvar notmuch-address-history nil)
 144
 145 (defun notmuch-address-message-insinuate ()
 146   (message "calling notmuch-address-message-insinuate is no longer needed"))
 147
 148 (defcustom notmuch-address-use-company t
 149   "If available, use company mode for address completion."
 150   :type 'boolean
 151   :group 'notmuch-send
 152   :group 'notmuch-address)
 153
 154 (defun notmuch-address-setup ()
 155   (let* ((setup-company (and notmuch-address-use-company
 156                            (require 'company nil t)))
 157          (pair (cons notmuch-address-completion-headers-regexp
 158                        #'notmuch-address-expand-name)))
 159       (when setup-company
 160         (notmuch-company-setup))
 161       (unless (member pair message-completion-alist)
 162         (setq message-completion-alist
 163               (push pair message-completion-alist)))))
 164
 165 (defun notmuch-address-toggle-internal-completion ()
 166   "Toggle use of internal completion for current buffer.
 167
 168 This overrides the global setting for address completion and
 169 toggles the setting in this buffer."
 170   (interactive)
 171   (if (local-variable-p 'notmuch-address-command)
 172       (kill-local-variable 'notmuch-address-command)
 173     (notmuch-setq-local notmuch-address-command 'internal))
 174   (if (boundp 'company-idle-delay)
 175       (if (local-variable-p 'company-idle-delay)
 176           (kill-local-variable 'company-idle-delay)
 177         (notmuch-setq-local company-idle-delay nil))))
 178
 179 (defun notmuch-address-matching (substring)
 180   "Returns a list of completion candidates matching SUBSTRING.
 181 The candidates are taken from `notmuch-address-completions'."
 182   (let ((candidates)
 183         (re (regexp-quote substring)))
 184     (maphash (lambda (key val)
 185                (when (string-match re key)
 186                  (push key candidates)))
 187              notmuch-address-completions)
 188     candidates))
 189
 190 (defun notmuch-address-options (original)
 191   "Returns a list of completion candidates. Uses either
 192 elisp-based implementation or older implementation requiring
 193 external commands."
 194   (cond
 195    ((eq notmuch-address-command 'internal)
 196     (unless (notmuch-address--harvest-ready)
 197       ;; First, run quick synchronous harvest based on what the user
 198       ;; entered so far
 199       (notmuch-address-harvest original t))
 200     (prog1 (notmuch-address-matching original)
 201       ;; Then start the (potentially long-running) full asynchronous harvest if necessary
 202       (notmuch-address-harvest-trigger)))
 203    (t
 204     (process-lines notmuch-address-command original))))
 205
 206 (defun notmuch-address-expand-name ()
 207   (cond
 208    ((and (eq notmuch-address-command 'internal)
 209          notmuch-address-use-company
 210          (bound-and-true-p company-mode))
 211     (company-manual-begin))
 212    (notmuch-address-command
 213     (let* ((end (point))
 214            (beg (save-excursion
 215                   (re-search-backward "\\(\\`\\|[\n:,]\\)[ \t]*")
 216                   (goto-char (match-end 0))
 217                   (point)))
 218            (orig (buffer-substring-no-properties beg end))
 219            (completion-ignore-case t)
 220            (options (with-temp-message "Looking for completion candidates..."
 221                       (notmuch-address-options orig)))
 222            (num-options (length options))
 223            (chosen (cond
 224                     ((eq num-options 0)
 225                      nil)
 226                     ((eq num-options 1)
 227                      (car options))
 228                     (t
 229                      (funcall notmuch-address-selection-function
 230                               (format "Address (%s matches): " num-options)
 231                               ;; We put the first match as the initial
 232                               ;; input; we put all the matches as
 233                               ;; possible completions, moving the
 234                               ;; first match to the end of the list
 235                               ;; makes cursor up/down in the list work
 236                               ;; better.
 237                               (append (cdr options) (list (car options)))
 238                               (car options))))))
 239       (if chosen
 240           (progn
 241             (push chosen notmuch-address-history)
 242             (delete-region beg end)
 243             (insert chosen)
 244             (run-hook-with-args 'notmuch-address-post-completion-functions chosen))
 245         (message "No matches.")
 246         (ding))))
 247    (t nil)))
 248
 249 ;; Copied from `w3m-which-command'.
 250 (defun notmuch-address-locate-command (command)
 251   "Return non-nil if `command' is an executable either on
 252 `exec-path' or an absolute pathname."
 253   (when (stringp command)
 254     (if (and (file-name-absolute-p command)
 255              (file-executable-p command))
 256         command
 257       (setq command (file-name-nondirectory command))
 258       (catch 'found-command
 259         (let (bin)
 260           (dolist (dir exec-path)
 261             (setq bin (expand-file-name command dir))
 262             (when (or (and (file-executable-p bin)
 263                            (not (file-directory-p bin)))
 264                       (and (file-executable-p (setq bin (concat bin ".exe")))
 265                            (not (file-directory-p bin))))
 266               (throw 'found-command bin))))))))
 267
 268 (defun notmuch-address-harvest-addr (result)
 269   (let ((name-addr (plist-get result :name-addr)))
 270     (puthash name-addr t notmuch-address-completions)))
 271
 272 (defun notmuch-address-harvest-handle-result (obj)
 273   (notmuch-address-harvest-addr obj))
 274
 275 (defun notmuch-address-harvest-filter (proc string)
 276   (when (buffer-live-p (process-buffer proc))
 277     (with-current-buffer (process-buffer proc)
 278       (save-excursion
 279         (goto-char (point-max))
 280         (insert string))
 281       (notmuch-sexp-parse-partial-list
 282        'notmuch-address-harvest-handle-result (process-buffer proc)))))
 283
 284 (defvar notmuch-address-harvest-procs '(nil . nil)
 285   "The currently running harvests.
 286
 287 The car is a partial harvest, and the cdr is a full harvest.")
 288
 289 (defun notmuch-address-harvest (&optional addr-prefix synchronous callback)
 290   "Collect addresses completion candidates.
 291
 292 It queries the notmuch database for messages sent/received (as
 293 configured with `notmuch-address-command`) by the user, collects
 294 destination/source addresses from those messages and stores them
 295 in `notmuch-address-completions'.
 296
 297 If ADDR-PREFIX is not nil, only messages with to/from addresses
 298 matching ADDR-PREFIX*' are queried.
 299
 300 Address harvesting may take some time so the address collection runs
 301 asynchronously unless SYNCHRONOUS is t. In case of asynchronous
 302 execution, CALLBACK is called when harvesting finishes."
 303
 304   (let* ((sent (eq (car notmuch-address-internal-completion) 'sent))
 305          (config-query (cadr notmuch-address-internal-completion))
 306          (prefix-query (when addr-prefix
 307                          (format "%s:%s*" (if sent "to" "from") addr-prefix)))
 308          (from-or-to-me-query
 309           (mapconcat (lambda (x)
 310                        (concat (if sent "from:" "to:") x))
 311                      (notmuch-user-emails) " or "))
 312          (query (if (or prefix-query config-query)
 313                     (concat (format "(%s)" from-or-to-me-query)
 314                             (when prefix-query
 315                               (format " and (%s)" prefix-query))
 316                             (when config-query
 317                               (format " and (%s)" config-query)))
 318                   from-or-to-me-query))
 319          (args `("address" "--format=sexp" "--format-version=4"
 320                  ,(if sent "--output=recipients" "--output=sender")
 321                  "--deduplicate=address"
 322                  ,query)))
 323     (if synchronous
 324         (mapc #'notmuch-address-harvest-addr
 325                                    (apply 'notmuch-call-notmuch-sexp args))
 326       ;; Asynchronous
 327       (let* ((current-proc (if addr-prefix
 328                                (car notmuch-address-harvest-procs)
 329                              (cdr notmuch-address-harvest-procs)))
 330              (proc-name (format "notmuch-address-%s-harvest"
 331                                 (if addr-prefix "partial" "full")))
 332              (proc-buf (concat " *" proc-name "*")))
 333         ;; Kill any existing process
 334         (when current-proc
 335           (kill-buffer (process-buffer current-proc))) ; this also kills the process
 336
 337         (setq current-proc
 338               (apply 'notmuch-start-notmuch proc-name proc-buf
 339                      callback                           ; process sentinel
 340                      args))
 341         (set-process-filter current-proc 'notmuch-address-harvest-filter)
 342         (set-process-query-on-exit-flag current-proc nil)
 343         (if addr-prefix
 344             (setcar notmuch-address-harvest-procs current-proc)
 345           (setcdr notmuch-address-harvest-procs current-proc)))))
 346   ;; return value
 347   nil)
 348
 349 (defvar notmuch-address--save-hash-version 1
 350   "Version format of the save hash.")
 351
 352 (defun notmuch-address--get-address-hash ()
 353   "Returns the saved address hash as a plist.
 354
 355 Returns nil if the save file does not exist, or it does not seem
 356 to be a saved address hash."
 357   (when notmuch-address-save-filename
 358     (condition-case nil
 359         (with-temp-buffer
 360           (insert-file-contents notmuch-address-save-filename)
 361           (let ((name (read (current-buffer)))
 362                 (plist (read (current-buffer))))
 363             ;; We do two simple sanity checks on the loaded file. We just
 364             ;; check a version is specified, not that it is the current
 365             ;; version, as we are allowed to over-write and a save-file with
 366             ;; an older version.
 367             (when (and (string= name "notmuch-address-hash")
 368                        (plist-get plist :version))
 369               plist)))
 370       ;; The error case catches any of the reads failing.
 371       (error nil))))
 372
 373 (defun notmuch-address--load-address-hash ()
 374   "Read the saved address hash and set the corresponding variables."
 375   (let ((load-plist (notmuch-address--get-address-hash)))
 376     (when (and load-plist
 377                ;; If the user's setting have changed, or the version
 378                ;; has changed, return nil to make sure the new settings
 379                ;; take effect.
 380                (equal (plist-get load-plist :completion-settings)
 381                       notmuch-address-internal-completion)
 382                (equal (plist-get load-plist :version)
 383                       notmuch-address--save-hash-version))
 384       (setq notmuch-address-last-harvest (plist-get load-plist :last-harvest)
 385             notmuch-address-completions (plist-get load-plist :completions)
 386             notmuch-address-full-harvest-finished t)
 387       ;; Return t to say load was successful.
 388       t)))
 389
 390 (defun notmuch-address--save-address-hash ()
 391   (when notmuch-address-save-filename
 392     (if (or (not (file-exists-p notmuch-address-save-filename))
 393               ;; The file exists, check it is a file we saved
 394             (notmuch-address--get-address-hash))
 395         (with-temp-file notmuch-address-save-filename
 396           (let ((save-plist (list :version notmuch-address--save-hash-version
 397                                   :completion-settings notmuch-address-internal-completion
 398                                   :last-harvest notmuch-address-last-harvest
 399                                   :completions notmuch-address-completions)))
 400             (print "notmuch-address-hash" (current-buffer))
 401             (print save-plist (current-buffer))))
 402       (message "\
 403 Warning: notmuch-address-save-filename %s exists but doesn't
 404 appear to be an address savefile.  Not overwriting."
 405                notmuch-address-save-filename))))
 406
 407 (defun notmuch-address-harvest-trigger ()
 408   (let ((now (float-time)))
 409     (when (> (- now notmuch-address-last-harvest) 86400)
 410       (setq notmuch-address-last-harvest now)
 411       (notmuch-address-harvest nil nil
 412                                (lambda (proc event)
 413                                  ;; If harvest fails, we want to try
 414                                  ;; again when the trigger is next
 415                                  ;; called
 416                                  (if (string= event "finished\n")
 417                                      (progn
 418                                        (notmuch-address--save-address-hash)
 419                                        (setq notmuch-address-full-harvest-finished t))
 420                                    (setq notmuch-address-last-harvest 0)))))))
 421
 422 ;;
 423
 424 (defun notmuch-address-from-minibuffer (prompt)
 425   (if (not notmuch-address-command)
 426       (read-string prompt)
 427     (let ((rmap (copy-keymap minibuffer-local-map))
 428           (omap minibuffer-local-map))
 429       ;; Configure TAB to start completion when executing read-string.
 430       ;; "Original" minibuffer keymap is restored just before calling
 431       ;; notmuch-address-expand-name as it may also use minibuffer-local-map
 432       ;; (completing-read probably does not but if something else is used there).
 433       (define-key rmap (kbd "TAB") (lambda ()
 434                                      (interactive)
 435                                      (let ((enable-recursive-minibuffers t)
 436                                            (minibuffer-local-map omap))
 437                                        (notmuch-address-expand-name))))
 438       (let ((minibuffer-local-map rmap))
 439         (read-string prompt)))))
 440
 441 ;;
 442
 443 (provide 'notmuch-address)
 444
 445 ;;; notmuch-address.el ends here