;;; company-etags.el --- company-mode completion backend for etags
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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 'cl-lib)
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(require 'etags)
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(defgroup company-etags nil
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"Completion backend for etags."
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:group 'company)
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(defcustom company-etags-use-main-table-list t
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"Always search `tags-table-list' if set.
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If this is disabled, `company-etags' will try to find the one table for each
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buffer automatically."
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:type '(choice (const :tag "off" nil)
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(const :tag "on" t)))
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(defcustom company-etags-ignore-case nil
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"Non-nil to ignore case in completion candidates."
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:type 'boolean
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:package-version '(company . "0.7.3"))
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(defcustom company-etags-everywhere nil
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"Non-nil to offer completions in comments and strings.
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Set it to t or to a list of major modes."
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:type '(choice (const :tag "Off" nil)
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(const :tag "Any supported mode" t)
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(repeat :tag "Some major modes"
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(symbol :tag "Major mode")))
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:package-version '(company . "0.9.0"))
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(defvar company-etags-modes '(prog-mode c-mode objc-mode c++-mode java-mode
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jde-mode pascal-mode perl-mode python-mode))
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(defvar-local company-etags-buffer-table 'unknown)
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(defun company-etags-find-table ()
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(let ((file (expand-file-name
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"TAGS"
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(locate-dominating-file (or buffer-file-name
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default-directory)
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"TAGS"))))
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(when (and file (file-regular-p file))
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(list file))))
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(defun company-etags-buffer-table ()
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(or (and company-etags-use-main-table-list tags-table-list)
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(if (eq company-etags-buffer-table 'unknown)
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(setq company-etags-buffer-table (company-etags-find-table))
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company-etags-buffer-table)))
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(defun company-etags--candidates (prefix)
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(let ((tags-table-list (company-etags-buffer-table))
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(tags-file-name tags-file-name)
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(completion-ignore-case company-etags-ignore-case))
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(and (or tags-file-name tags-table-list)
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(fboundp 'tags-completion-table)
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(save-excursion
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(visit-tags-table-buffer)
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(all-completions prefix (tags-completion-table))))))
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;;;###autoload
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(defun company-etags (command &optional arg &rest ignored)
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"`company-mode' completion backend for etags."
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(interactive (list 'interactive))
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(cl-case command
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(interactive (company-begin-backend 'company-etags))
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(prefix (and (apply #'derived-mode-p company-etags-modes)
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(or (eq t company-etags-everywhere)
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(apply #'derived-mode-p company-etags-everywhere)
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(not (company-in-string-or-comment)))
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(company-etags-buffer-table)
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(or (company-grab-symbol) 'stop)))
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(candidates (company-etags--candidates arg))
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(location (let ((tags-table-list (company-etags-buffer-table)))
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(when (fboundp 'find-tag-noselect)
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(save-excursion
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(let ((buffer (find-tag-noselect arg)))
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(cons buffer (with-current-buffer buffer (point))))))))
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(ignore-case company-etags-ignore-case)))
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(provide 'company-etags)
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;;; company-etags.el ends here
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