lisp/textmodes/text-mode.el

   1 ;;; text-mode.el --- text mode, and its idiosyncratic commands.
   2
   3 ;; Maintainer: FSF
   4 ;; Last-Modified: 31 Oct 1989
   5
   6 ;; Copyright (C) 1985, 1992 Free Software Foundation, Inc.
   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
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Code:
  25
  26 (defvar text-mode-syntax-table nil
  27   "Syntax table used while in text mode.")
  28
  29 (defvar text-mode-abbrev-table nil
  30   "Abbrev table used while in text mode.")
  31 (define-abbrev-table 'text-mode-abbrev-table ())
  32
  33 (if text-mode-syntax-table
  34     ()
  35   (setq text-mode-syntax-table (make-syntax-table))
  36   (modify-syntax-entry ?\" ".   " text-mode-syntax-table)
  37   (modify-syntax-entry ?\\ ".   " text-mode-syntax-table)
  38   (modify-syntax-entry ?' "w   " text-mode-syntax-table))
  39
  40 (defvar text-mode-map nil
  41   "Keymap for Text mode.
  42 Many other modes, such as Mail mode, Outline mode and Indented Text mode,
  43 inherit all the commands defined in this map.")
  44
  45 (if text-mode-map
  46     ()
  47   (setq text-mode-map (make-sparse-keymap))
  48   (define-key text-mode-map "\t" 'tab-to-tab-stop)
  49   (define-key text-mode-map "\es" 'center-line)
  50   (define-key text-mode-map "\eS" 'center-paragraph))
  51
  52 \f
  53 ;(defun non-saved-text-mode ()
  54 ;  "Like text-mode, but delete auto save file when file is saved for real."
  55 ;  (text-mode)
  56 ;  (make-local-variable 'delete-auto-save-files)
  57 ;  (setq delete-auto-save-files t))
  58
  59 (defun text-mode ()
  60   "Major mode for editing text intended for humans to read.  Special commands:\\{text-mode-map}
  61 Turning on text-mode calls the value of the variable `text-mode-hook',
  62 if that value is non-nil."
  63   (interactive)
  64   (kill-all-local-variables)
  65   (use-local-map text-mode-map)
  66   (setq mode-name "Text")
  67   (setq major-mode 'text-mode)
  68   (setq local-abbrev-table text-mode-abbrev-table)
  69   (set-syntax-table text-mode-syntax-table)
  70   (run-hooks 'text-mode-hook))
  71
  72 (defvar indented-text-mode-map ()
  73   "Keymap for Indented Text mode.
  74 All the commands defined in Text mode are inherited unless overridden.")
  75
  76 (if indented-text-mode-map
  77     ()
  78   ;; Make different definintion for TAB before the one in text-mode-map, but
  79   ;; share the rest.
  80   (let ((newmap (make-sparse-keymap)))
  81     (define-key newmap "\t" 'indent-relative)
  82     (setq indented-text-mode-map (nconc newmap text-mode-map))))
  83
  84 (defun indented-text-mode ()
  85   "Major mode for editing indented text intended for humans to read.\\{indented-text-mode-map}
  86 Turning on indented-text-mode calls the value of the variable `text-mode-hook',
  87 if that value is non-nil."
  88   (interactive)
  89   (kill-all-local-variables)
  90   (use-local-map text-mode-map)
  91   (define-abbrev-table 'text-mode-abbrev-table ())
  92   (setq local-abbrev-table text-mode-abbrev-table)
  93   (set-syntax-table text-mode-syntax-table)
  94   (make-local-variable 'indent-line-function)
  95   (setq indent-line-function 'indent-relative-maybe)
  96   (use-local-map indented-text-mode-map)
  97   (setq mode-name "Indented Text")
  98   (setq major-mode 'indented-text-mode)
  99   (run-hooks 'text-mode-hook))
 100
 101 (defun center-paragraph ()
 102   "Center each nonblank line in the paragraph at or after point.
 103 See center-line for more info."
 104   (interactive)
 105   (save-excursion
 106     (forward-paragraph)
 107     (or (bolp) (newline 1))
 108     (let ((end (point)))
 109       (backward-paragraph)
 110       (center-region (point) end))))
 111
 112 (defun center-region (from to)
 113   "Center each nonblank line starting in the region.
 114 See center-line for more info."
 115   (interactive "r")
 116   (if (> from to)
 117       (let ((tem to))
 118         (setq to from from tem)))
 119   (save-excursion
 120     (save-restriction
 121       (narrow-to-region from to)
 122       (goto-char from)
 123       (while (not (eobp))
 124         (or (save-excursion (skip-chars-forward " \t") (eolp))
 125             (center-line))
 126         (forward-line 1)))))
 127
 128 (defun center-line ()
 129   "Center the line point is on, within the width specified by `fill-column'.
 130 This means adjusting the indentation so that it equals
 131 the distance between the end of the text and `fill-column'."
 132   (interactive)
 133   (save-excursion
 134     (let (line-length)
 135       (beginning-of-line)
 136       (delete-horizontal-space)
 137       (end-of-line)
 138       (delete-horizontal-space)
 139       (setq line-length (current-column))
 140       (beginning-of-line)
 141       (indent-to
 142         (+ left-margin
 143            (/ (- fill-column left-margin line-length) 2))))))
 144
 145 ;;; text-mode.el ends here