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1 | ;;; zone-mode.el -- major mode for editing DNS zone files. |
2 | ||
3 | ;; Copyright (C) 1998 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: John Heidemann <johnh@isi.edu> | |
6 | ;; Keywords: DNS, 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 2, or (at your option) | |
13 | ;; 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; see the file COPYING. If not, write to the | |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
24 | ||
25 | ;;; | |
26 | ;;; See the comments in ``define-derived-mode zone-mode'' | |
27 | ;;; (the last function in this file) | |
28 | ;;; for what this mode is and how to use it automatically. | |
29 | ;;; | |
30 | ||
31 | ;;; | |
32 | ;;; Credits: | |
33 | ;;; Zone-mode was written by John Heidemann <johnh@isi.edu>, | |
34 | ;;; with bug fixes from Simon Leinen <simon@limmat.switch.ch>. | |
35 | ;;; | |
36 | ||
37 | ;;; Code: | |
38 | ||
39 | (defun zone-mode-update-serial () | |
40 | "Update the serial number in a zone." | |
41 | (interactive) | |
42 | (save-excursion | |
43 | (goto-char (point-min)) | |
44 | (while (re-search-forward "\\b\\([0-9]+\\)\\([0-9][0-9]\\)\\([ \t]+;[ \t]+[Ss]erial\\)" (point-max) t) | |
45 | (let* ((old-date (match-string 1)) | |
46 | (old-seq (match-string 2)) | |
47 | (old-seq-num (string-to-number (match-string 2))) | |
48 | (old-flag (match-string 3)) | |
49 | (cur-date (format-time-string "%Y%m%d")) | |
50 | (new-seq | |
51 | (cond | |
52 | ((not (string= old-date cur-date)) | |
53 | "00") ;; reset sequeence number | |
54 | ((>= old-seq-num 99) | |
55 | (error "Serial number's sequenece cannot increment beyond 99.")) | |
56 | (t | |
57 | (format "%02d" (1+ old-seq-num))))) | |
58 | (old-serial (concat old-date old-seq)) | |
59 | (new-serial (concat cur-date new-seq))) | |
60 | (if (string-lessp new-serial old-serial) | |
61 | (error (format "Serial numbers want to move backwards from %s to %s!" old-serial new-serial)) | |
62 | (replace-match (concat cur-date new-seq old-flag) t t)))))) | |
63 | ||
64 | ;;;###autoload | |
65 | (defun zone-mode-update-serial-hook () | |
66 | "Update the serial number in a zone if the file was modified" | |
67 | (interactive) | |
68 | (if (buffer-modified-p (current-buffer)) | |
69 | (zone-mode-update-serial)) | |
70 | nil ;; so we can run from write-file-hooks | |
71 | ) | |
72 | ||
73 | (defvar zone-mode-syntax-table nil | |
74 | "Zone-mode's syntax table.") | |
75 | ||
76 | (defun zone-mode-load-time-setup () | |
77 | "init zone-mode stuff" | |
78 | (setq zone-mode-syntax-table (make-syntax-table)) | |
79 | (modify-syntax-entry ?\; "<" zone-mode-syntax-table) | |
80 | (modify-syntax-entry ?\n ">" zone-mode-syntax-table)) | |
81 | ||
82 | ;;;###autoload | |
83 | (define-derived-mode zone-mode fundamental-mode "zone" | |
84 | "A mode for editing DNS zone files. | |
85 | ||
86 | Zone-mode does two things: | |
87 | ||
88 | - automatically update the serial number for a zone | |
89 | when saving the file | |
90 | ||
91 | - fontification" | |
92 | ||
93 | (make-local-hook 'write-file-hooks) | |
94 | (add-hook 'write-file-hooks 'zone-mode-update-serial-hook) | |
95 | ||
96 | (if (null zone-mode-syntax-table) | |
97 | (zone-mode-load-time-setup)) ;; should have been run at load-time | |
98 | ||
99 | ;; font-lock support: | |
100 | (set-syntax-table zone-mode-syntax-table) | |
101 | (make-local-variable 'comment-start) | |
102 | (setq comment-start ";") | |
103 | (make-local-variable 'comment-start-skip) | |
104 | ;; Look within the line for a ; following an even number of backslashes | |
105 | ;; after either a non-backslash or the line beginning. | |
106 | (setq comment-start-skip "\\(\\(^\\|[^\\\\\n]\\)\\(\\\\\\\\\\)*\\);+[ \t]*") | |
107 | (make-local-variable 'comment-column) | |
108 | (setq comment-column 40) | |
109 | (make-local-variable 'font-lock-defaults) | |
110 | (setq font-lock-defaults | |
111 | '(nil nil nil nil beginning-of-line))) | |
112 | ||
113 | (zone-mode-load-time-setup) | |
114 | ||
115 | (provide 'zone-mode) | |
116 | ||
117 | ;;; zone-mode.el ends here |