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;;; autoconf.el --- mode for editing Autoconf configure.ac files
;; Copyright (C) 2000-2019 Free Software Foundation, Inc.
;; Author: Dave Love <fx@gnu.org>
;; Keywords: languages
;; 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:
;; Provides fairly minimal font-lock, imenu and indentation support
;; for editing configure.ac files. Only Autoconf syntax is processed.
;; There is no attempt to deal with shell text -- probably that will
;; always lose.
;; This is specialized for configure.ac files. It doesn't inherit the
;; general M4 stuff from M4 mode.
;; There is also an autoconf-mode.el in existence. That appears to be
;; for editing the Autoconf M4 source, rather than configure.ac files.
;;; Code:
(defvar autoconf-mode-map (make-sparse-keymap))
(defvar autoconf-mode-hook nil
"Hook run by `autoconf-mode'.")
(defconst autoconf-definition-regexp
"A\\(?:H_TEMPLATE\\|C_\\(?:SUBST\\|DEFINE\\(?:_UNQUOTED\\)?\\)\\)(\\[*\\(\\(?:\\sw\\|\\s_\\)+\\)\\]*")
(defvar autoconf-font-lock-keywords
`(("\\_<A[CHMS]_\\(?:\\sw\\|\\s_\\)+" . font-lock-keyword-face)
(,autoconf-definition-regexp
1 font-lock-function-name-face)
;; Are any other M4 keywords really appropriate for configure.ac,
;; given that we do `dnl'?
("changequote" . font-lock-keyword-face)))
(defvar autoconf-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?\" "." table)
(modify-syntax-entry ?\n ">" table)
(modify-syntax-entry ?# "<" table)
table))
(defvar autoconf-imenu-generic-expression
(list (list nil autoconf-definition-regexp 1)))
;; It's not clear how best to implement this.
(defun autoconf-current-defun-function ()
"Function to use for `add-log-current-defun-function' in Autoconf mode.
This version looks back for an AC_DEFINE or AC_SUBST. It will stop
searching backwards at another AC_... command."
(save-excursion
(skip-syntax-forward "w_" (line-end-position))
(if (re-search-backward autoconf-definition-regexp
(save-excursion (beginning-of-defun) (point))
t)
(match-string-no-properties 1))))
;;;###autoload
(define-derived-mode autoconf-mode prog-mode "Autoconf"
"Major mode for editing Autoconf configure.ac files."
(setq-local parens-require-spaces nil) ; for M4 arg lists
(setq-local defun-prompt-regexp "^[ \t]*A[CM]_\\(\\sw\\|\\s_\\)+")
(setq-local comment-start "dnl ")
;; We want to avoid matching "dnl" in other text.
(setq-local comment-start-skip "\\(?:\\(\\W\\|^\\)dnl\\|#\\) +")
(setq-local syntax-propertize-function
(syntax-propertize-rules ("\\<dnl\\>" (0 "<"))))
(setq-local font-lock-defaults
'(autoconf-font-lock-keywords nil nil))
(setq-local imenu-generic-expression autoconf-imenu-generic-expression)
(setq-local indent-line-function #'indent-relative)
(setq-local add-log-current-defun-function
#'autoconf-current-defun-function))
(provide 'autoconf-mode)
(provide 'autoconf)
;;; autoconf.el ends here
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