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1 ;;; text-mode.el --- text mode, and its idiosyncratic commands.
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2
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3 ;; Copyright (C) 1985, 1992, 1994 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;; Synched up with: FSF 19.30.
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24
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25 ;;; Commentary:
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26
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27 ;; This package provides the fundamental text mode documented in the
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28 ;; Emacs user's manual.
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29
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30 ;;; Code:
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31
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32 (defvar text-mode-syntax-table nil
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33 "Syntax table used while in text mode.")
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34
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35 (defvar text-mode-abbrev-table nil
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36 "Abbrev table used while in text mode.")
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37 (define-abbrev-table 'text-mode-abbrev-table ())
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38
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39 (if text-mode-syntax-table
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40 ()
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41 (setq text-mode-syntax-table (make-syntax-table))
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42 (modify-syntax-entry ?\" ". " text-mode-syntax-table)
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43 (modify-syntax-entry ?\\ ". " text-mode-syntax-table)
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44 (modify-syntax-entry ?' "w " text-mode-syntax-table))
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45
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46 (defvar text-mode-map nil
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47 "Keymap for Text mode.
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48 Many other modes, such as Mail mode, Outline mode and Indented Text mode,
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49 inherit all the commands defined in this map.")
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50
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51 (if text-mode-map
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52 ()
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53 (setq text-mode-map (make-sparse-keymap))
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54 (set-keymap-name text-mode-map 'text-mode-map)
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55 (define-key text-mode-map "\t" 'tab-to-tab-stop)
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56 (define-key text-mode-map "\es" 'center-line)
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57 (define-key text-mode-map "\eS" 'center-paragraph))
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58
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59
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60 ;(defun non-saved-text-mode ()
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61 ; "Like text-mode, but delete auto save file when file is saved for real."
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62 ; (text-mode)
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63 ; (make-local-variable 'delete-auto-save-files)
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64 ; (setq delete-auto-save-files t))
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65
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66 (defun text-mode ()
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67 "Major mode for editing text intended for humans to read.
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68 Special commands:\\{text-mode-map}
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69 Turning on Text mode calls the value of the variable `text-mode-hook',
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70 if that value is non-nil."
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71 (interactive)
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72 (kill-all-local-variables)
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73 (use-local-map text-mode-map)
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74 (setq mode-name "Text")
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75 (setq major-mode 'text-mode)
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76 (setq local-abbrev-table text-mode-abbrev-table)
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77 (set-syntax-table text-mode-syntax-table)
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78 (run-hooks 'text-mode-hook))
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79
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80 (defvar indented-text-mode-map ()
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81 "Keymap for Indented Text mode.
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82 All the commands defined in Text mode are inherited unless overridden.")
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83
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84 (if indented-text-mode-map
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85 ()
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86 ;; Make different definition for TAB before the one in text-mode-map, but
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87 ;; share the rest.
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88 (setq indented-text-mode-map (make-sparse-keymap))
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89 (set-keymap-name indented-text-mode-map 'indented-text-mode-map)
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90 (set-keymap-parents indented-text-mode-map (list text-mode-map))
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91 (define-key indented-text-mode-map "\t" 'indent-relative))
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92
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93 (defun indented-text-mode ()
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94 "Major mode for editing text with indented paragraphs.
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95 In this mode, paragraphs are delimited only by blank lines.
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96 You can thus get the benefit of adaptive filling
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97 (see the variable `adaptive-fill-mode').
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98 \\{indented-text-mode-map}
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99 Turning on `indented-text-mode' calls the value of the variable
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100 `text-mode-hook', if that value is non-nil."
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101 (interactive)
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102 (kill-all-local-variables)
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103 (use-local-map text-mode-map)
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104 (define-abbrev-table 'text-mode-abbrev-table ())
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105 (setq local-abbrev-table text-mode-abbrev-table)
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106 (set-syntax-table text-mode-syntax-table)
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107 (make-local-variable 'indent-line-function)
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108 (setq indent-line-function 'indent-relative-maybe)
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109 (make-local-variable 'paragraph-start)
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110 (setq paragraph-start (concat "$\\|" page-delimiter))
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111 (make-local-variable 'paragraph-separate)
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112 (setq paragraph-separate paragraph-start)
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113 (use-local-map indented-text-mode-map)
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114 (setq mode-name "Indented Text")
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115 (setq major-mode 'indented-text-mode)
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116 (run-hooks 'text-mode-hook 'indented-text-mode-hook))
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117
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118 (defun center-paragraph ()
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119 "Center each nonblank line in the paragraph at or after point.
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120 See `center-line' for more info."
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121 (interactive)
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122 (save-excursion
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123 (forward-paragraph)
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124 (or (bolp) (newline 1))
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125 (let ((end (point)))
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126 (backward-paragraph)
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127 (center-region (point) end))))
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128
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129 (defun center-region (from to)
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130 "Center each nonblank line starting in the region.
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131 See `center-line' for more info."
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132 (interactive "r")
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133 (if (> from to)
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134 (let ((tem to))
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135 (setq to from from tem)))
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136 (save-excursion
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137 (save-restriction
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138 (narrow-to-region from to)
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139 (goto-char from)
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140 (while (not (eobp))
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141 (or (save-excursion (skip-chars-forward " \t") (eolp))
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142 (center-line))
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143 (forward-line 1)))))
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144
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145 (defun center-line (&optional nlines)
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146 "Center the line point is on, within the width specified by `fill-column'.
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147 This means adjusting the indentation so that it equals
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148 the distance between the end of the text and `fill-column'.
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149 The argument NLINES says how many lines to center."
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150 (interactive "P")
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151 (if nlines (setq nlines (prefix-numeric-value nlines)))
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152 (while (not (eq nlines 0))
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153 (save-excursion
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154 (let ((lm (current-left-margin))
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155 line-length)
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156 (beginning-of-line)
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157 (delete-horizontal-space)
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158 (end-of-line)
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159 (delete-horizontal-space)
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160 (setq line-length (current-column))
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161 (if (> (- fill-column lm line-length) 0)
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162 (indent-line-to
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163 (+ lm (/ (- fill-column lm line-length) 2))))))
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164 (cond ((null nlines)
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165 (setq nlines 0))
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166 ((> nlines 0)
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167 (setq nlines (1- nlines))
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168 (forward-line 1))
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169 ((< nlines 0)
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170 (setq nlines (1+ nlines))
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171 (forward-line -1)))))
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172
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173 ;;; text-mode.el ends here
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