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company-etags.el
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company-etags.el
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;;; company-etags.el --- company-mode completion backend for etags -*- lexical-binding: t -*-
;; Copyright (C) 2009-2011, 2013-2015, 2018-2019, 2023 Free Software Foundation, Inc.
;; Author: Nikolaj Schumacher
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(require 'company)
(require 'cl-lib)
(require 'etags)
(defgroup company-etags nil
"Completion backend for etags."
:group 'company)
(defcustom company-etags-use-main-table-list t
"Always search `tags-table-list' if set.
If this is disabled, `company-etags' will try to find the one table for each
buffer automatically."
:type '(choice (const :tag "off" nil)
(const :tag "on" t)))
(defcustom company-etags-ignore-case nil
"Non-nil to ignore case in completion candidates."
:type 'boolean
:package-version '(company . "0.7.3"))
(defcustom company-etags-everywhere nil
"Non-nil to offer completions in comments and strings.
Set it to t or to a list of major modes."
:type '(choice (const :tag "Off" nil)
(const :tag "Any supported mode" t)
(repeat :tag "Some major modes"
(symbol :tag "Major mode")))
:package-version '(company . "0.9.0"))
(defvar company-etags-modes '(prog-mode c-mode objc-mode c++-mode java-mode
jde-mode pascal-mode perl-mode python-mode))
(defvar-local company-etags-buffer-table 'unknown)
(defun company-etags-find-table ()
(let ((file (expand-file-name
"TAGS"
(locate-dominating-file (or buffer-file-name
default-directory)
"TAGS"))))
(when (and file (file-regular-p file))
(list file))))
(defun company-etags-buffer-table ()
(or (and company-etags-use-main-table-list tags-table-list)
(if (eq company-etags-buffer-table 'unknown)
(setq company-etags-buffer-table (company-etags-find-table))
company-etags-buffer-table)))
(defun company-etags--candidates (prefix)
(let ((tags-table-list (company-etags-buffer-table))
(tags-file-name tags-file-name)
(completion-ignore-case company-etags-ignore-case))
(and (or tags-file-name tags-table-list)
(fboundp 'tags-completion-table)
(save-excursion
(visit-tags-table-buffer)
(all-completions prefix (tags-completion-table))))))
;;;###autoload
(defun company-etags (command &optional arg &rest _ignored)
"`company-mode' completion backend for etags."
(interactive (list 'interactive))
(cl-case command
(interactive (company-begin-backend 'company-etags))
(prefix (and (cl-some #'derived-mode-p company-etags-modes)
(or (eq t company-etags-everywhere)
(cl-some #'derived-mode-p company-etags-everywhere)
(not (company-in-string-or-comment)))
(company-etags-buffer-table)
(or (company-grab-symbol) 'stop)))
(candidates (company-etags--candidates arg))
(location (let ((tags-table-list (company-etags-buffer-table)))
(when (fboundp 'find-tag-noselect)
(save-excursion
(let ((buffer (find-tag-noselect arg)))
(cons buffer (with-current-buffer buffer (point))))))))
(ignore-case company-etags-ignore-case)))
(provide 'company-etags)
;;; company-etags.el ends here