Commit | Line | Data |
---|---|---|
e8af40ee | 1 | ;;; zone-mode.el --- major mode for editing DNS zone files |
8749abea GM |
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 | ||
e8af40ee PJ |
25 | ;;; Commentary: |
26 | ||
8749abea GM |
27 | ;;; |
28 | ;;; See the comments in ``define-derived-mode zone-mode'' | |
29 | ;;; (the last function in this file) | |
30 | ;;; for what this mode is and how to use it automatically. | |
31 | ;;; | |
32 | ||
33 | ;;; | |
34 | ;;; Credits: | |
35 | ;;; Zone-mode was written by John Heidemann <johnh@isi.edu>, | |
36 | ;;; with bug fixes from Simon Leinen <simon@limmat.switch.ch>. | |
37 | ;;; | |
38 | ||
39 | ;;; Code: | |
40 | ||
41 | (defun zone-mode-update-serial () | |
42 | "Update the serial number in a zone." | |
43 | (interactive) | |
44 | (save-excursion | |
45 | (goto-char (point-min)) | |
46 | (while (re-search-forward "\\b\\([0-9]+\\)\\([0-9][0-9]\\)\\([ \t]+;[ \t]+[Ss]erial\\)" (point-max) t) | |
47 | (let* ((old-date (match-string 1)) | |
48 | (old-seq (match-string 2)) | |
49 | (old-seq-num (string-to-number (match-string 2))) | |
50 | (old-flag (match-string 3)) | |
51 | (cur-date (format-time-string "%Y%m%d")) | |
52 | (new-seq | |
53 | (cond | |
54 | ((not (string= old-date cur-date)) | |
283b4456 | 55 | "00") ;; reset sequence number |
8749abea | 56 | ((>= old-seq-num 99) |
283b4456 | 57 | (error "Serial number's sequence cannot increment beyond 99")) |
8749abea GM |
58 | (t |
59 | (format "%02d" (1+ old-seq-num))))) | |
60 | (old-serial (concat old-date old-seq)) | |
61 | (new-serial (concat cur-date new-seq))) | |
62 | (if (string-lessp new-serial old-serial) | |
283b4456 | 63 | (error (format "Serial numbers want to move backwards from %s to %s" old-serial new-serial)) |
8749abea | 64 | (replace-match (concat cur-date new-seq old-flag) t t)))))) |
a1506d29 | 65 | |
8749abea GM |
66 | ;;;###autoload |
67 | (defun zone-mode-update-serial-hook () | |
283b4456 | 68 | "Update the serial number in a zone if the file was modified." |
8749abea GM |
69 | (interactive) |
70 | (if (buffer-modified-p (current-buffer)) | |
71 | (zone-mode-update-serial)) | |
72 | nil ;; so we can run from write-file-hooks | |
73 | ) | |
74 | ||
75 | (defvar zone-mode-syntax-table nil | |
76 | "Zone-mode's syntax table.") | |
77 | ||
78 | (defun zone-mode-load-time-setup () | |
283b4456 | 79 | "Initialise `zone-mode' stuff." |
8749abea GM |
80 | (setq zone-mode-syntax-table (make-syntax-table)) |
81 | (modify-syntax-entry ?\; "<" zone-mode-syntax-table) | |
82 | (modify-syntax-entry ?\n ">" zone-mode-syntax-table)) | |
83 | ||
84 | ;;;###autoload | |
85 | (define-derived-mode zone-mode fundamental-mode "zone" | |
86 | "A mode for editing DNS zone files. | |
87 | ||
88 | Zone-mode does two things: | |
89 | ||
90 | - automatically update the serial number for a zone | |
91 | when saving the file | |
92 | ||
93 | - fontification" | |
94 | ||
f1b69327 | 95 | (add-hook 'write-file-hooks 'zone-mode-update-serial-hook nil t) |
8749abea GM |
96 | |
97 | (if (null zone-mode-syntax-table) | |
98 | (zone-mode-load-time-setup)) ;; should have been run at load-time | |
99 | ||
100 | ;; font-lock support: | |
101 | (set-syntax-table zone-mode-syntax-table) | |
102 | (make-local-variable 'comment-start) | |
103 | (setq comment-start ";") | |
104 | (make-local-variable 'comment-start-skip) | |
105 | ;; Look within the line for a ; following an even number of backslashes | |
106 | ;; after either a non-backslash or the line beginning. | |
107 | (setq comment-start-skip "\\(\\(^\\|[^\\\\\n]\\)\\(\\\\\\\\\\)*\\);+[ \t]*") | |
108 | (make-local-variable 'comment-column) | |
109 | (setq comment-column 40) | |
110 | (make-local-variable 'font-lock-defaults) | |
111 | (setq font-lock-defaults | |
112 | '(nil nil nil nil beginning-of-line))) | |
113 | ||
114 | (zone-mode-load-time-setup) | |
115 | ||
116 | (provide 'zone-mode) | |
117 | ||
118 | ;;; zone-mode.el ends here |