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+;;; autoconf-mode.el --- autoconf code editing commands for Emacs
+
+;; Author: Martin Buchholz (martin@xemacs.org)
+;; Maintainer: Martin Buchholz
+;; Keywords: languages, faces, m4, configure
+
+;; This file is part of Autoconf
+
+;; Copyright (C) 2001, 2006, 2009-2012 Free Software Foundation, Inc.
+;;
+;; This program 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.
+;;
+;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;; A major mode for editing autoconf input (like configure.in).
+;; Derived from m4-mode.el by Andrew Csillag (drew@staff.prodigy.com)
+
+;;; Your should add the following to your Emacs configuration file:
+
+;;  (autoload 'autoconf-mode "autoconf-mode"
+;;            "Major mode for editing autoconf files." t)
+;;  (setq auto-mode-alist
+;;        (cons '("\\.ac\\'\\|configure\\.in\\'" . autoconf-mode)
+;;              auto-mode-alist))
+
+;;; Code:
+
+;;thank god for make-regexp.el!
+(defvar autoconf-font-lock-keywords
+  `(("\\bdnl \\(.*\\)"  1 font-lock-comment-face t)
+    ("\\$[0-9*#@]" . font-lock-variable-name-face)
+    ("\\b\\(m4_\\)?\\(builtin\\|change\\(com\\|quote\\|word\\)\\|d\\(e\\(bug\\(file\\|mode\\)\\|cr\\|f\\(ine\\|n\\)\\)\\|iv\\(ert\\|num\\)\\|nl\\|umpdef\\)\\|e\\(rrprint\\|syscmd\\|val\\)\\|f\\(ile\\|ormat\\)\\|gnu\\|i\\(f\\(def\\|else\\)\\|n\\(c\\(lude\\|r\\)\\|d\\(ex\\|ir\\)\\)\\)\\|l\\(en\\|ine\\)\\|m\\(4\\(exit\\|wrap\\)\\|aketemp\\|kstemp\\)\\|p\\(atsubst\\|opdef\\|ushdef\\)\\|regexp\\|s\\(hift\\|include\\|ubstr\\|ys\\(cmd\\|val\\)\\)\\|tra\\(ceo\\(ff\\|n\\)\\|nslit\\)\\|un\\(d\\(efine\\|ivert\\)\\|ix\\)\\)\\b" . font-lock-keyword-face)
+    ("^\\(\\(m4_\\)?define\\(_default\\)?\\|A._DEFUN\\|m4_defun\\(_once\\|_init\\)?\\)(\\[?\\([A-Za-z0-9_]+\\)" 5 font-lock-function-name-face)
+    "default font-lock-keywords")
+)
+
+(defvar autoconf-mode-syntax-table nil
+  "syntax table used in autoconf mode")
+(setq autoconf-mode-syntax-table (make-syntax-table))
+(modify-syntax-entry ?\" "\""  autoconf-mode-syntax-table)
+;;(modify-syntax-entry ?\' "\""  autoconf-mode-syntax-table)
+(modify-syntax-entry ?#  "<\n" autoconf-mode-syntax-table)
+(modify-syntax-entry ?\n ">#"  autoconf-mode-syntax-table)
+(modify-syntax-entry ?\( "()"   autoconf-mode-syntax-table)
+(modify-syntax-entry ?\) ")("   autoconf-mode-syntax-table)
+(modify-syntax-entry ?\[ "(]"  autoconf-mode-syntax-table)
+(modify-syntax-entry ?\] ")["  autoconf-mode-syntax-table)
+(modify-syntax-entry ?*  "."   autoconf-mode-syntax-table)
+(modify-syntax-entry ?_  "_"   autoconf-mode-syntax-table)
+
+(defvar autoconf-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map '[(control c) (\;)] 'comment-region)
+    map))
+
+(defun autoconf-current-defun ()
+  "Autoconf value for `add-log-current-defun-function'.
+This tells add-log.el how to find the current macro."
+  (save-excursion
+    (if (re-search-backward "^\\(m4_define\\(_default\\)?\\|m4_defun\\(_once\\|_init\\)?\\|A._DEFUN\\)(\\[*\\([A-Za-z0-9_]+\\)" nil t)
+	(buffer-substring (match-beginning 4)
+			  (match-end 4))
+      nil)))
+
+;;;###autoload
+(defun autoconf-mode ()
+  "A major-mode to edit Autoconf files like configure.ac.
+\\{autoconf-mode-map}
+"
+  (interactive)
+  (kill-all-local-variables)
+  (use-local-map autoconf-mode-map)
+
+  (make-local-variable 'add-log-current-defun-function)
+  (setq add-log-current-defun-function 'autoconf-current-defun)
+
+  (make-local-variable 'comment-start)
+  (setq comment-start "# ")
+  (make-local-variable 'parse-sexp-ignore-comments)
+  (setq parse-sexp-ignore-comments t)
+
+  (make-local-variable	'font-lock-defaults)
+  (setq major-mode 'autoconf-mode)
+  (setq mode-name "Autoconf")
+  (setq font-lock-defaults `(autoconf-font-lock-keywords nil))
+  (set-syntax-table autoconf-mode-syntax-table)
+  (run-hooks 'autoconf-mode-hook))
+
+(provide 'autoconf-mode)
+
+;;; autoconf-mode.el ends here