git.notmuchmail.org Git - notmuch/blob - emacs/notmuch-company.el

   1 ;;; notmuch-company.el --- Mail address completion for notmuch via company-mode  -*- lexical-binding: t -*-
   2
   3 ;; Authors: Trevor Jim <tjim@mac.com>
   4 ;;          Michal Sojka <sojkam1@fel.cvut.cz>
   5 ;;
   6 ;; Keywords: mail, completion
   7
   8 ;; This program is free software; you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation, either version 3 of the License, or
  11 ;; (at your option) any later version.
  12
  13 ;; This program is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
  20
  21 ;;; Commentary:
  22
  23 ;; To enable this, install company mode (https://company-mode.github.io/)
  24 ;;
  25 ;; NB company-minimum-prefix-length defaults to 3 so you don't get
  26 ;; completion unless you type 3 characters
  27
  28 ;;; Code:
  29
  30 (eval-when-compile (require 'cl))
  31
  32 (defvar notmuch-company-last-prefix nil)
  33 (make-variable-buffer-local 'notmuch-company-last-prefix)
  34 (declare-function company-begin-backend "company")
  35 (declare-function company-grab "company")
  36 (declare-function company-mode "company")
  37 (declare-function company-manual-begin "company")
  38 (defvar company-backends)
  39
  40 (declare-function notmuch-address-harvest "notmuch-address")
  41 (declare-function notmuch-address-harvest-trigger "notmuch-address")
  42 (declare-function notmuch-address-matching "notmuch-address")
  43 (defvar notmuch-address-full-harvest-finished)
  44 (defvar notmuch-address-completion-headers-regexp)
  45
  46 ;;;###autoload
  47 (defun notmuch-company-setup ()
  48   (company-mode)
  49   (make-local-variable 'company-backends)
  50   (setq company-backends '(notmuch-company))
  51   ;; Disable automatic company completion unless an internal
  52   ;; completion method is configured. Company completion (using
  53   ;; internal completion) can still be accessed via standard company
  54   ;; functions, e.g., company-complete.
  55   (unless (eq notmuch-address-command 'internal)
  56     (setq-local company-idle-delay nil)))
  57
  58 ;;;###autoload
  59 (defun notmuch-company (command &optional arg &rest _ignore)
  60   "`company-mode' completion back-end for `notmuch'."
  61   (interactive (list 'interactive))
  62   (require 'company)
  63   (let ((case-fold-search t)
  64         (completion-ignore-case t))
  65     (case command
  66       (interactive (company-begin-backend 'notmuch-company))
  67       (prefix (and (derived-mode-p 'message-mode)
  68                    (looking-back (concat notmuch-address-completion-headers-regexp ".*")
  69                                  (line-beginning-position))
  70                    (setq notmuch-company-last-prefix (company-grab "[:,][ \t]*\\(.*\\)" 1 (point-at-bol)))))
  71       (candidates (cond
  72                    (notmuch-address-full-harvest-finished
  73                     ;; Update harvested addressed from time to time
  74                     (notmuch-address-harvest-trigger)
  75                     (notmuch-address-matching arg))
  76                    (t
  77                     (cons :async
  78                           (lambda (callback)
  79                             ;; First run quick asynchronous harvest based on what the user entered so far
  80                             (notmuch-address-harvest
  81                              arg nil
  82                              (lambda (_proc _event)
  83                                (funcall callback (notmuch-address-matching arg))
  84                                ;; Then start the (potentially long-running) full asynchronous harvest if necessary
  85                                (notmuch-address-harvest-trigger))))))))
  86       (match (if (string-match notmuch-company-last-prefix arg)
  87                  (match-end 0)
  88                0))
  89       (no-cache t))))
  90
  91
  92 (provide 'notmuch-company)
  93
  94 ;;; notmuch-company.el ends here