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slack-company.el
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;;; slack-company.el --- -*- lexical-binding: t; -*-
;; Copyright (C) 2018 南優也
;; Author: 南優也 <yuyaminami@minamiyuuya-no-MacBook.local>
;; Keywords:
;; This program 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.
;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(require 'slack-util)
(require 'slack-buffer)
(require 'slack-usergroup)
(require 'slack-slash-commands)
(declare-function company-begin-backend "company")
(defun company-slack-backend (command &optional arg &rest ignored)
"Completion backend for slack chats. It currently understands
@USER; adding #CHANNEL should be a simple matter of programming."
(interactive (list 'interactive))
(cl-labels
((start-from-line-beginning (str)
(let ((prompt-length (length lui-prompt-string)))
(>= 0 (- (current-column) prompt-length (length str)))))
(prefix-type (str) (cond
((string-prefix-p "@" str) 'user-or-usergroup)
((string-prefix-p "#" str) 'channel)
((and (string-prefix-p "/" str)
(start-from-line-beginning str))
'slash)))
(content (str) (substring str 1 nil))
(content-match-p (content text)
(or (eq 0 (length content))
(string-prefix-p content text))))
(cl-case command
(interactive (when (fboundp 'company-begin-backend)
(company-begin-backend 'company-slack-backend)))
(prefix (when (string= "slack" (car (split-string (format "%s" major-mode) "-")))
(slack--grab-line
"\\(\\W\\|^\\)\\(\\(@\\|#\\|/\\)\\(\\w\\|.\\|-\\|_\\)*\\)"
2)))
(candidates (slack-if-let*
((content (content arg))
(team (and slack-current-buffer
(slack-buffer-team slack-current-buffer))))
(cl-case (prefix-type arg)
(user-or-usergroup
(nconc
(cl-loop for special in '("here" "channel" "everyone")
if (content-match-p content special)
collect (propertize (concat "@" special)
'slack-company-prefix 'keyword
'slack-mention-keyword special))
(cl-loop for usergroup in (oref team usergroups)
if (and (not (slack-usergroup-deleted-p usergroup))
(content-match-p content
(oref usergroup handle)))
collect (propertize (concat "@" (slack-format-usergroup usergroup))
'slack-company-prefix 'usergroup
'slack-usergroup-id (oref usergroup id)))
(cl-loop for user in (slack-team-users team)
if (and (not (eq (plist-get user :deleted) t))
(or (content-match-p content
(slack-user-real-name user))
(content-match-p content
(slack-user-display-name user))))
collect (propertize (concat "@" (slack-user--name user team))
'slack-company-prefix 'user
'slack-user-id (plist-get user :id)))))
(channel
(cl-loop for channel in (slack-team-channels team)
if (content-match-p content
(oref channel name))
collect (propertize (concat "#" (oref channel name))
'slack-company-prefix 'channel
'slack-channel-id (oref channel id))))
(slash
(cl-loop for command in (oref team commands)
if (content-match-p (concat "/" content)
(oref command name))
collect (oref command name))))))
(post-completion
(cl-case (get-text-property 0 'slack-company-prefix arg)
(user (let* ((inserted arg)
(end (point))
(user-id (get-text-property 0 'slack-user-id arg)))
(when (re-search-backward (substring-no-properties inserted)
(point-min)
t)
(let ((beg (point)))
(delete-region beg end)
(slack-insert-user-mention user-id inserted)))))
(channel (let* ((inserted arg)
(end (point))
(channel-id (get-text-property 0 'slack-channel-id arg)))
(when (re-search-backward (substring-no-properties inserted)
(point-min)
t)
(let ((beg (point)))
(delete-region beg end)
(slack-insert-channel-mention channel-id inserted)))))
(keyword (let* ((inserted arg)
(end (point))
(keyword (get-text-property 0 'slack-mention-keyword arg)))
(when (re-search-backward (substring-no-properties inserted)
(point-at-bol)
t)
(let ((beg (point)))
(delete-region beg end)
(slack-insert-keyword-mention keyword inserted)))))
(usergroup (let* ((inserted arg)
(end (point))
(id (get-text-property 0 'slack-usergroup-id arg)))
(when (re-search-backward (substring-no-properties inserted)
(point-at-bol)
t)
(let ((beg (point)))
(delete-region beg end)
(slack-insert-usergroup-mention id inserted)))))))
(doc-buffer
(cl-case (prefix-type arg)
(user-or-usergroup
(slack-if-let* ((team (and slack-current-buffer
(slack-buffer-team slack-current-buffer)))
(user-id (get-text-property 0 'slack-user-id arg))
(user (slack-user--find user-id team)))
(slack--completion-doc-buffer (slack-user--profile-to-string user team))))
(slash
(slack--completion-doc-buffer
(let* ((team (and slack-current-buffer
(slack-buffer-team slack-current-buffer)))
(command (slack-command-find arg team)))
(when command
(slack-command-company-doc-string command team))))))))))
;;;; Utils
;; Following functions are taken from company.el[1]. This way there
;; is no direct dependency to company.el and you can use something
;; like cape[2] to use this completion backend without company itself.
;;
;; [1]: https://github.com/company-mode/company-mode/blob/master/company.el
;; [2]: https://github.com/minad/cape?tab=readme-ov-file#company-adapter
(defun slack--grab (regexp &optional expression limit)
(when (looking-back regexp limit)
(or (match-string-no-properties (or expression 0)) "")))
(defun slack--grab-line (regexp &optional expression)
"Return a match string for REGEXP if it matches text before point.
If EXPRESSION is non-nil, return the match string for the respective
parenthesized expression in REGEXP.
Matching is limited to the current line."
(let ((inhibit-field-text-motion t))
(slack--grab regexp expression (line-beginning-position))))
(defun slack--completion-doc-buffer (&optional string)
(with-current-buffer (get-buffer-create " *slack-completion-documentation*")
(erase-buffer)
(fundamental-mode)
(when string
(save-excursion
(insert string)
(visual-line-mode)))
(current-buffer)))
(provide 'slack-company)
;;; slack-company.el ends here