1;;; autoconf.el --- mode for editing Autoconf configure.ac files -*- lexical-binding: t; -*- 2 3;; Copyright (C) 2000-2021 Free Software Foundation, Inc. 4 5;; Author: Dave Love <fx@gnu.org> 6;; Keywords: languages 7 8;; This file is part of GNU Emacs. 9 10;; GNU Emacs is free software: you can redistribute it and/or modify 11;; it under the terms of the GNU General Public License as published by 12;; the Free Software Foundation, either version 3 of the License, or 13;; (at your option) any later version. 14 15;; GNU Emacs is distributed in the hope that it will be useful, 16;; but WITHOUT ANY WARRANTY; without even the implied warranty of 17;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18;; GNU General Public License for more details. 19 20;; You should have received a copy of the GNU General Public License 21;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. 22 23;;; Commentary: 24 25;; Provides fairly minimal font-lock, imenu and indentation support 26;; for editing configure.ac files. Only Autoconf syntax is processed. 27;; There is no attempt to deal with shell text -- probably that will 28;; always lose. 29 30;; This is specialized for configure.ac files. It doesn't inherit the 31;; general M4 stuff from M4 mode. 32 33;; There is also an autoconf-mode.el in existence. That appears to be 34;; for editing the Autoconf M4 source, rather than configure.ac files. 35 36;;; Code: 37 38(defvar autoconf-mode-map (make-sparse-keymap)) 39 40(defvar autoconf-mode-hook nil 41 "Hook run by `autoconf-mode'.") 42 43(defconst autoconf-definition-regexp 44 "A\\(?:H_TEMPLATE\\|C_\\(?:SUBST\\|DEFINE\\(?:_UNQUOTED\\)?\\)\\)(\\[*\\(\\(?:\\sw\\|\\s_\\)+\\)\\]*") 45 46(defvar autoconf-font-lock-keywords 47 `(("\\_<\\(?:A[CHMS]\\|LT\\)_\\(?:\\sw\\|\\s_\\)+" . font-lock-keyword-face) 48 (,autoconf-definition-regexp 49 1 font-lock-function-name-face) 50 ;; Are any other M4 keywords really appropriate for configure.ac, 51 ;; given that we do `dnl'? 52 ("changequote" . font-lock-keyword-face))) 53 54(defvar autoconf-mode-syntax-table 55 (let ((table (make-syntax-table))) 56 (modify-syntax-entry ?\" "." table) 57 (modify-syntax-entry ?\n ">" table) 58 (modify-syntax-entry ?# "<" table) 59 table)) 60 61(defvar autoconf-imenu-generic-expression 62 (list (list nil autoconf-definition-regexp 1))) 63 64;; It's not clear how best to implement this. 65(defun autoconf-current-defun-function () 66 "Function to use for `add-log-current-defun-function' in Autoconf mode. 67This version looks back for an AC_DEFINE or AC_SUBST. It will stop 68searching backwards at another AC_... command." 69 (save-excursion 70 (skip-syntax-forward "w_" (line-end-position)) 71 (if (re-search-backward autoconf-definition-regexp 72 (save-excursion (beginning-of-defun) (point)) 73 t) 74 (match-string-no-properties 1)))) 75 76;;;###autoload 77(define-derived-mode autoconf-mode prog-mode "Autoconf" 78 "Major mode for editing Autoconf configure.ac files." 79 (setq-local parens-require-spaces nil) ; for M4 arg lists 80 (setq-local defun-prompt-regexp "^[ \t]*A[CM]_\\(\\sw\\|\\s_\\)+") 81 (setq-local comment-start "dnl ") 82 ;; We want to avoid matching "dnl" in other text. 83 (setq-local comment-start-skip "\\(?:\\(\\W\\|^\\)dnl\\|#\\) +") 84 (setq-local syntax-propertize-function 85 (syntax-propertize-rules ("\\<dnl\\>" (0 "<")))) 86 (setq-local font-lock-defaults 87 '(autoconf-font-lock-keywords nil nil)) 88 (setq-local imenu-generic-expression autoconf-imenu-generic-expression) 89 (setq-local indent-line-function #'indent-relative) 90 (setq-local add-log-current-defun-function 91 #'autoconf-current-defun-function)) 92 93(provide 'autoconf-mode) 94(provide 'autoconf) 95 96;;; autoconf.el ends here 97