lisp/mh-e/mh-buffers.el

   1 ;;; mh-buffers.el --- MH-E buffer constants and utilities
   2
   3 ;; Copyright (C) 1993, 1995, 1997, 2000-2012  Free Software Foundation, Inc.
   4
   5 ;; Author: Bill Wohler <wohler@newt.com>
   6 ;; Maintainer: Bill Wohler <wohler@newt.com>
   7 ;; Keywords: mail
   8 ;; See: mh-e.el
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;;; Change Log:
  28
  29 ;;; Code:
  30
  31 ;; The names of ephemeral buffers have a " *mh-" prefix (so that they
  32 ;; are hidden and can be programmatically removed in mh-quit), and the
  33 ;; variable names have the form mh-temp-.*-buffer.
  34 (defconst mh-temp-buffer " *mh-temp*")  ;scratch
  35 (defconst mh-temp-checksum-buffer " *mh-checksum*")
  36 (defconst mh-temp-fetch-buffer " *mh-fetch*")  ;wget/curl/fetch output
  37 (defconst mh-temp-index-buffer " *mh-index*")
  38
  39 ;; The names of MH-E buffers that are not ephemeral and can be used by
  40 ;; the user (and deleted by the user when no longer needed) have a
  41 ;; "*MH-E " prefix (so they can be programmatically removed in
  42 ;; mh-quit), and the variable names have the form mh-.*-buffer.
  43 ;; Temporary buffers for search results
  44 (defconst mh-aliases-buffer "*MH-E Aliases*") ;alias lookups
  45 (defconst mh-folders-buffer "*MH-E Folders*") ;folder list
  46 (defconst mh-help-buffer "*MH-E Help*") ;quick help
  47 (defconst mh-info-buffer "*MH-E Info*") ;version information buffer
  48 (defconst mh-log-buffer "*MH-E Log*") ;output of MH commands and so on
  49 (defconst mh-mail-delivery-buffer "*MH-E Mail Delivery*") ;mail delivery log
  50 (defconst mh-recipients-buffer "*MH-E Recipients*") ;killed when draft sent
  51 (defconst mh-sequences-buffer "*MH-E Sequences*") ;sequences list
  52
  53 (defvar mh-log-buffer-lines 100
  54   "Number of lines to keep in `mh-log-buffer'.")
  55
  56 \f
  57
  58 (defun mh-truncate-log-buffer ()
  59   "If `mh-log-buffer' is too big then truncate it.
  60 If the number of lines in `mh-log-buffer' exceeds
  61 `mh-log-buffer-lines' then keep only the last
  62 `mh-log-buffer-lines'. As a side effect the point is set to the
  63 end of the log buffer.
  64
  65 The function returns the size of the final size of the log buffer."
  66   (with-current-buffer (get-buffer-create mh-log-buffer)
  67     (goto-char (point-max))
  68     (save-excursion
  69       (when (equal (forward-line (- mh-log-buffer-lines)) 0)
  70         (delete-region (point-min) (point))))
  71     (unless (or (bobp)
  72                 (save-excursion
  73                   (and (equal (forward-line -1) 0) (equal (char-after) ?\f))))
  74       (insert "\n\f\n"))
  75     (buffer-size)))
  76
  77 (provide 'mh-buffers)
  78
  79 ;; Local Variables:
  80 ;; indent-tabs-mode: nil
  81 ;; sentence-end-double-space: nil
  82 ;; End:
  83
  84 ;;; mh-buffers.el ends here