;;; company-gtags.el --- company-mode completion backend for GNU Global
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;; Copyright (C) 2009-2011, 2014 Free Software Foundation, Inc.
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;; Author: Nikolaj Schumacher
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;;; Code:
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(require 'company)
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(require 'company-template)
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(require 'cl-lib)
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(defgroup company-gtags nil
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"Completion backend for GNU Global."
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:group 'company)
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(define-obsolete-variable-alias
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'company-gtags-gnu-global-program-name
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'company-gtags-executable "earlier")
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(defcustom company-gtags-executable
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(executable-find "global")
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"Location of GNU global executable."
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:type 'string)
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(defcustom company-gtags-insert-arguments t
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"When non-nil, insert function arguments as a template after completion."
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:type 'boolean
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:package-version '(company . "0.8.1"))
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(defvar-local company-gtags--tags-available-p 'unknown)
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(defcustom company-gtags-modes '(prog-mode jde-mode)
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"Modes that use `company-gtags'.
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In all these modes (and their derivatives) `company-gtags' will perform
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completion."
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:type '(repeat (symbol :tag "Major mode"))
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:package-version '(company . "0.8.4"))
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(defun company-gtags--tags-available-p ()
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(if (eq company-gtags--tags-available-p 'unknown)
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(setq company-gtags--tags-available-p
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(locate-dominating-file buffer-file-name "GTAGS"))
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company-gtags--tags-available-p))
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(defun company-gtags--fetch-tags (prefix)
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(with-temp-buffer
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(let (tags)
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(when (= 0 (process-file company-gtags-executable nil
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;; "-T" goes through all the tag files listed in GTAGSLIBPATH
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(list (current-buffer) nil) nil "-xGqT" (concat "^" prefix)))
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(goto-char (point-min))
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(cl-loop while
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(re-search-forward (concat
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"^"
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"\\([^ ]*\\)" ;; completion
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"[ \t]+\\([[:digit:]]+\\)" ;; linum
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"[ \t]+\\([^ \t]+\\)" ;; file
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"[ \t]+\\(.*\\)" ;; definition
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"$"
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) nil t)
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collect
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(propertize (match-string 1)
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'meta (match-string 4)
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'location (cons (expand-file-name (match-string 3))
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(string-to-number (match-string 2)))
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))))))
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(defun company-gtags--annotation (arg)
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(let ((meta (get-text-property 0 'meta arg)))
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(when (string-match (concat arg "\\((.*)\\).*") meta)
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(match-string 1 meta))))
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;;;###autoload
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(defun company-gtags (command &optional arg &rest ignored)
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"`company-mode' completion backend for GNU Global."
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(interactive (list 'interactive))
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(cl-case command
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(interactive (company-begin-backend 'company-gtags))
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(prefix (and company-gtags-executable
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buffer-file-name
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(apply #'derived-mode-p company-gtags-modes)
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(not (company-in-string-or-comment))
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(company-gtags--tags-available-p)
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(or (company-grab-symbol) 'stop)))
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(candidates (company-gtags--fetch-tags arg))
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(sorted t)
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(duplicates t)
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(annotation (company-gtags--annotation arg))
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(meta (get-text-property 0 'meta arg))
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(location (get-text-property 0 'location arg))
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(post-completion (let ((anno (company-gtags--annotation arg)))
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(when (and company-gtags-insert-arguments anno)
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(insert anno)
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(company-template-c-like-templatify anno))))))
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(provide 'company-gtags)
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;;; company-gtags.el ends here
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