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120 lines
3.8 KiB
EmacsLisp
120 lines
3.8 KiB
EmacsLisp
;;; zone-mode.el --- major mode for editing DNS zone files
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;; Copyright (C) 1998 Free Software Foundation, Inc.
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;; Author: John Heidemann <johnh@isi.edu>
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;; Keywords: DNS, languages
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;;
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;;; See the comments in ``define-derived-mode zone-mode''
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;;; (the last function in this file)
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;;; for what this mode is and how to use it automatically.
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;;;
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;;;
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;;; Credits:
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;;; Zone-mode was written by John Heidemann <johnh@isi.edu>,
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;;; with bug fixes from Simon Leinen <simon@limmat.switch.ch>.
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;;;
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;;; Code:
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(defun zone-mode-update-serial ()
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"Update the serial number in a zone."
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(interactive)
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(save-excursion
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(goto-char (point-min))
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(while (re-search-forward "\\b\\([0-9]+\\)\\([0-9][0-9]\\)\\([ \t]+;[ \t]+[Ss]erial\\)" (point-max) t)
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(let* ((old-date (match-string 1))
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(old-seq (match-string 2))
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(old-seq-num (string-to-number (match-string 2)))
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(old-flag (match-string 3))
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(cur-date (format-time-string "%Y%m%d"))
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(new-seq
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(cond
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((not (string= old-date cur-date))
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"00") ;; reset sequence number
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((>= old-seq-num 99)
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(error "Serial number's sequence cannot increment beyond 99"))
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(t
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(format "%02d" (1+ old-seq-num)))))
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(old-serial (concat old-date old-seq))
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(new-serial (concat cur-date new-seq)))
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(if (string-lessp new-serial old-serial)
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(error (format "Serial numbers want to move backwards from %s to %s" old-serial new-serial))
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(replace-match (concat cur-date new-seq old-flag) t t))))))
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;;;###autoload
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(defun zone-mode-update-serial-hook ()
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"Update the serial number in a zone if the file was modified."
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(interactive)
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(if (buffer-modified-p (current-buffer))
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(zone-mode-update-serial))
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nil ;; so we can run from write-file-hooks
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)
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(defvar zone-mode-syntax-table nil
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"Zone-mode's syntax table.")
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(defun zone-mode-load-time-setup ()
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"Initialise `zone-mode' stuff."
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(setq zone-mode-syntax-table (make-syntax-table))
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(modify-syntax-entry ?\; "<" zone-mode-syntax-table)
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(modify-syntax-entry ?\n ">" zone-mode-syntax-table))
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;;;###autoload
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(define-derived-mode zone-mode fundamental-mode "zone"
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"A mode for editing DNS zone files.
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Zone-mode does two things:
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- automatically update the serial number for a zone
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when saving the file
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- fontification"
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(add-hook 'write-file-hooks 'zone-mode-update-serial-hook nil t)
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(if (null zone-mode-syntax-table)
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(zone-mode-load-time-setup)) ;; should have been run at load-time
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;; font-lock support:
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(set-syntax-table zone-mode-syntax-table)
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(make-local-variable 'comment-start)
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(setq comment-start ";")
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(make-local-variable 'comment-start-skip)
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;; Look within the line for a ; following an even number of backslashes
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;; after either a non-backslash or the line beginning.
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(setq comment-start-skip "\\(\\(^\\|[^\\\\\n]\\)\\(\\\\\\\\\\)*\\);+[ \t]*")
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(make-local-variable 'comment-column)
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(setq comment-column 40)
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(make-local-variable 'font-lock-defaults)
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(setq font-lock-defaults
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'(nil nil nil nil beginning-of-line)))
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(zone-mode-load-time-setup)
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(provide 'zone-mode)
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;;; arch-tag: 6a2940ef-fd4f-4de7-b979-b027b09821fe
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;;; zone-mode.el ends here
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