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+;;; autoconf.el --- Mode for editing Autoconf configure.in files.
+
+;; Copyright (C) 2000 Free Software Foundation, Inc.
+
+;; Author: Dave Love <fx@gnu.org>
+;; Keywords: languages
+;; $Revision: $
+
+;; 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 2, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Provides fairly minimal font-lock, imenu and indentation support
+;; for editing configure.in 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.in 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.in files.
+
+;;; Code:
+
+(defvar autoconf-mode-map (make-sparse-keymap))
+
+(defvar autoconf-mode-hook nil
+  "Hook run by `autoconf-mode'.")
+
+(defconst autoconf-font-lock-syntactic-keywords
+  '(("\\<dnl\\>" 0 '(11))))
+
+(defconst autoconf-definition-regexp
+  "AC_\\(SUBST\\|DEFINE\\(_UNQUOTED\\)?\\)(\\(\\sw+\\)")
+
+(defvar autoconf-font-lock-keywords
+  `(("A[CM]_\\sw+" . font-lock-keyword-face)
+    (,autoconf-definition-regexp
+     3 font-lock-function-name-face)
+    ;; Are any other M4 keywords really appropriate for configure.in,
+    ;; 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 3)))
+
+;; 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
+    (with-syntax-table autoconf-mode-syntax-table
+      (modify-syntax-entry ?_ "w")
+      (if (re-search-backward autoconf-definition-regexp
+                             (save-excursion (beginning-of-defun) (point))
+                             t)
+         (match-string-no-properties 3)))))
+
+;;;###autoload
+(defun autoconf-mode ()
+  "Major mode for editing Autoconf configure.in files."
+  (interactive)
+  (kill-all-local-variables)
+  (use-local-map autoconf-mode-map)
+  (setq major-mode 'autoconf-mode)
+  (setq mode-name "Autoconf")
+  (set-syntax-table autoconf-mode-syntax-table)
+  (set (make-local-variable 'parens-require-spaces) nil) ; for M4 arg lists
+  (set (make-local-variable 'defun-prompt-regexp)
+       "^[ \t]*A[CM]_\\(\\sw\\|\\s_\\)+")
+  (set (make-local-variable 'comment-start) "dnl ")
+  (set (make-local-variable 'comment-start-skip) "\\(\\<dnl\\|#\\) +")
+  (set (make-local-variable 'font-lock-syntactic-keywords)
+       autoconf-font-lock-syntactic-keywords)
+  (set (make-local-variable 'font-lock-defaults)
+       `(autoconf-font-lock-keywords nil nil (("_" . "w"))))
+  (set (make-local-variable 'imenu-generic-expression)
+       autoconf-imenu-generic-expression)
+  (set (make-local-variable 'imenu-syntax-alist) '(("_" . "w")))
+  (set (make-local-variable 'indent-line-function) #'indent-relative)
+  (set (make-local-variable 'add-log-current-defun-function)
+       #'autoconf-current-defun-function)
+  (run-hooks 'autoconf-mode-hook))
+
+(provide 'autoconf-mode)
+
+;;; autoconf.el ends here