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;;; company-gtags.el --- company-mode completion backend for GNU Global
;; Copyright (C) 2009-2011, 2014-2020 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(require 'company)
(require 'company-template)
(require 'cl-lib)
(defgroup company-gtags nil
"Completion backend for GNU Global."
:group 'company)
(define-obsolete-variable-alias
'company-gtags-gnu-global-program-name
'company-gtags-executable "earlier")
(defcustom company-gtags-executable
(executable-find "global")
"Location of GNU global executable."
:type 'string)
(defcustom company-gtags-insert-arguments t
"When non-nil, insert function arguments as a template after completion."
:type 'boolean
:package-version '(company . "0.8.1"))
(defvar-local company-gtags--tags-available-p 'unknown)
(defcustom company-gtags-modes '(prog-mode jde-mode)
"Modes that use `company-gtags'.
In all these modes (and their derivatives) `company-gtags' will perform
completion."
:type '(repeat (symbol :tag "Major mode"))
:package-version '(company . "0.8.4"))
(defun company-gtags--tags-available-p ()
(if (eq company-gtags--tags-available-p 'unknown)
(setq company-gtags--tags-available-p
(locate-dominating-file buffer-file-name "GTAGS"))
company-gtags--tags-available-p))
(defun company-gtags--fetch-tags (prefix)
(with-temp-buffer
(let (tags)
;; For some reason Global v 6.6.3 is prone to returning exit status 1
;; even on successful searches when '-T' is used.
(when (/= 3 (process-file company-gtags-executable nil
;; "-T" goes through all the tag files listed in GTAGSLIBPATH
(list (current-buffer) nil) nil "-xGqT" (concat "^" prefix)))
(goto-char (point-min))
(cl-loop while
(re-search-forward (concat
"^"
"\\([^ ]*\\)" ;; completion
"[ \t]+\\([[:digit:]]+\\)" ;; linum
"[ \t]+\\([^ \t]+\\)" ;; file
"[ \t]+\\(.*\\)" ;; definition
"$"
) nil t)
collect
(propertize (match-string 1)
'meta (match-string 4)
'location (cons (expand-file-name (match-string 3))
(string-to-number (match-string 2)))
))))))
(defun company-gtags--annotation (arg)
(let ((meta (get-text-property 0 'meta arg)))
(when (string-match (concat (regexp-quote arg) "\\((.*)\\).*") meta)
(match-string 1 meta))))
;;;###autoload
(defun company-gtags (command &optional arg &rest ignored)
"`company-mode' completion backend for GNU Global."
(interactive (list 'interactive))
(cl-case command
(interactive (company-begin-backend 'company-gtags))
(prefix (and company-gtags-executable
buffer-file-name
(apply #'derived-mode-p company-gtags-modes)
(not (company-in-string-or-comment))
(company-gtags--tags-available-p)
(or (company-grab-symbol) 'stop)))
(candidates (company-gtags--fetch-tags arg))
(sorted t)
(duplicates t)
(annotation (company-gtags--annotation arg))
(meta (get-text-property 0 'meta arg))
(location (get-text-property 0 'location arg))
(post-completion (let ((anno (company-gtags--annotation arg)))
(when (and company-gtags-insert-arguments anno)
(insert anno)
(company-template-c-like-templatify anno))))))
(provide 'company-gtags)
;;; company-gtags.el ends here
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