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+;;; m4-mode.el --- m4 code editing commands for Emacs
+
+;;; Copyright (C) 1996 Free Software Foundation, Inc.
+
+;; Author: Andrew Csillag <drew@staff.prodigy.com>
+;; Maintainer: Andrew Csillag <drew@staff.prodigy.com>
+;; Keywords: languages, faces
+
+;; 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:
+
+;; A smart editing mode for m4 macro definitions.  It seems to have most of the 
+;; syntax right (sexp motion commands work, but function motion commands don't).
+;; It also sets the font-lock syntax stuff for colorization
+
+;; To Do's:
+
+;; * want to make m4-m4-(buffer|region) look sorta like M-x compile look&feel ?
+;; * sexp motion commands don't seem to work right
+
+;; to autoload m4 lisp code:  
+;; (autoload 'm4-mode "m4-mode" nil t)
+;;
+;; or can use (load "m4-mode") or (require 'm4-mode) to just load it 
+;;
+;; to try to "auto-detect" m4 files:
+;; (setq auto-mode-alist 
+;;       (cons '(".*\\.m4$" . m4-mode)
+;;             auto-mode-alist))
+
+;;; Thanks: 
+;;;         to Akim Demaille and Terry Jones for the bug reports
+
+;;; Code:
+
+;;path to the m4 program
+(defvar m4-program "/usr/local/bin/m4")
+
+;;thank god for make-regexp.el!
+(defvar m4-font-lock-keywords
+  `(
+    ("^\\\#.*" . font-lock-comment-face)
+    ("\\\$\\\*" . font-lock-variable-name-face)
+    ("\\\$[0-9]" . font-lock-variable-name-face)
+    ("\\\$\\\#" . font-lock-variable-name-face)
+    ("\\b\\(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\\)\\|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)
+    ("\\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\\)\\|i\\(f\\(def\\|else\\)\\|n\\(c\\(lude\\|r\\)\\|d\\(ex\\|ir\\)\\)\\)\\|l\\(en\\|ine\\)\\|m\\(4\\(_undefine\\|exit\\|wrap\\)\\|aketemp\\)\\|p\\(atsubst\\|opdef\\|ushdef\\)\\|regexp\\|s\\(hift\\|include\\|ubstr\\|ys\\(cmd\\|val\\)\\)\\|tra\\(ceo\\(ff\\|n\\)\\|nslit\\)\\|undivert\\)\\)\\b" . font-lock-keyword-face)
+    "default font-lock-keywords")
+)
+
+;;this may still need some work
+(defvar m4-mode-syntax-table nil
+  "syntax table used in m4 mode")
+(setq m4-mode-syntax-table (make-syntax-table))
+(modify-syntax-entry ?` "('" m4-mode-syntax-table)
+(modify-syntax-entry ?' ")`" m4-mode-syntax-table)
+(modify-syntax-entry ?# "<\n" m4-mode-syntax-table)
+(modify-syntax-entry ?\n ">#" m4-mode-syntax-table)
+(modify-syntax-entry ?{  "_" m4-mode-syntax-table)
+(modify-syntax-entry ?}  "_" m4-mode-syntax-table)
+(modify-syntax-entry ?*  "w" m4-mode-syntax-table)
+(modify-syntax-entry ?_  "w" m4-mode-syntax-table)
+
+(defvar m4-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map "\C-c\C-b" 'm4-m4-buffer)
+    (define-key map "\C-c\C-r" 'm4-m4-region)
+    (define-key map "\C-c\C-c" 'comment-region)
+    map))
+
+(defun m4-m4-buffer ()
+  "send contents of the current buffer to m4"
+  (interactive)
+  (start-process "m4process" "*m4 output*" m4-program "-e")
+  (process-send-region "m4process" (point-min) (point-max))
+  (process-send-eof "m4process")
+  (switch-to-buffer "*m4 output*")
+)
+
+(defun m4-m4-region ()
+  "send contents of the current region to m4"
+  (interactive)
+  (start-process "m4process" "*m4 output*" m4-program "-e")
+  (process-send-region "m4process" (point) (mark))
+  (process-send-eof "m4process")
+  (switch-to-buffer "*m4 output*")
+)
+
+(defun m4-mode ()
+  "A major-mode to edit m4 macro files
+\\{m4-mode-map}
+"
+  (interactive)
+  (kill-all-local-variables)
+  (use-local-map m4-mode-map)
+
+  (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 'm4-mode
+        mode-name "m4"
+        font-lock-defaults `(m4-font-lock-keywords nil)
+        )
+  (set-syntax-table m4-mode-syntax-table)
+  (run-hooks 'm4-mode-hook))
+
+(provide 'm4-mode)
+;;stuff to play with for debugging
+;(char-to-string (char-syntax ?`))
+
+;;;how I generate the nasty looking regexps at the top
+;;;(make-regexp '("builtin" "changecom" "changequote" "changeword" "debugfile" 
+;;;               "debugmode" "decr" "define" "defn" "divert" "divnum" "dnl" 
+;;;               "dumpdef" "errprint" "esyscmd" "eval" "file" "format" "gnu"
+;;;               "ifdef" "ifelse" "include" "incr" "index" "indir" "len" "line" 
+;;;               "m4exit" "m4wrap" "maketemp" "patsubst" "popdef" "pushdef" "regexp" 
+;;;               "shift" "sinclude" "substr" "syscmd" "sysval" "traceoff" "traceon" 
+;;;               "translit" "undefine" "undivert" "unix"))
+;;;(make-regexp '("m4_builtin" "m4_changecom" "m4_changequote" "m4_changeword" 
+;;;               "m4_debugfile" "m4_debugmode" "m4_decr" "m4_define" "m4_defn" 
+;;;               "m4_divert" "m4_divnum" "m4_dnl" "m4_dumpdef" "m4_errprint" 
+;;;               "m4_esyscmd" "m4_eval" "m4_file" "m4_format" "m4_ifdef" "m4_ifelse" 
+;;;               "m4_include" "m4_incr" "m4_index" "m4_indir" "m4_len" "m4_line" 
+;;;               "m4_m4exit" "m4_m4wrap" "m4_maketemp" "m4_patsubst" "m4_popdef" 
+;;;               "m4_pushdef" "m4_regexp" "m4_shift" "m4_sinclude" "m4_substr" 
+;;;               "m4_syscmd" "m4_sysval" "m4_traceoff" "m4_traceon" "m4_translit" 
+;;;               "m4_m4_undefine" "m4_undivert"))
+
+;;; m4.el ends here