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comparison lisp/modes/text-mode.el @ 0:376386a54a3c r19-14

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Import from CVS: tag r19-14
author cvs
date Mon, 13 Aug 2007 08:45:50 +0200
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1 ;;; text-mode.el --- text mode, and its idiosyncratic commands.
2
3 ;; Copyright (C) 1985, 1992, 1994 Free Software Foundation, Inc.
4
5 ;; Maintainer: FSF
6
7 ;; This file is part of XEmacs.
8
9 ;; XEmacs is free software; you can redistribute it and/or modify it
10 ;; under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation; either version 2, or (at your option)
12 ;; any later version.
13
14 ;; XEmacs is distributed in the hope that it will be useful, but
15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 ;; General Public License for more details.
18
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
22
23 ;;; Synched up with: FSF 19.30.
24
25 ;;; Commentary:
26
27 ;; This package provides the fundamental text mode documented in the
28 ;; Emacs user's manual.
29
30 ;;; Code:
31
32 (defvar text-mode-syntax-table nil
33 "Syntax table used while in text mode.")
34
35 (defvar text-mode-abbrev-table nil
36 "Abbrev table used while in text mode.")
37 (define-abbrev-table 'text-mode-abbrev-table ())
38
39 (if text-mode-syntax-table
40 ()
41 (setq text-mode-syntax-table (make-syntax-table))
42 (modify-syntax-entry ?\" ". " text-mode-syntax-table)
43 (modify-syntax-entry ?\\ ". " text-mode-syntax-table)
44 (modify-syntax-entry ?' "w " text-mode-syntax-table))
45
46 (defvar text-mode-map nil
47 "Keymap for Text mode.
48 Many other modes, such as Mail mode, Outline mode and Indented Text mode,
49 inherit all the commands defined in this map.")
50
51 (if text-mode-map
52 ()
53 (setq text-mode-map (make-sparse-keymap))
54 (set-keymap-name text-mode-map 'text-mode-map)
55 (define-key text-mode-map "\t" 'tab-to-tab-stop)
56 (define-key text-mode-map "\es" 'center-line)
57 (define-key text-mode-map "\eS" 'center-paragraph))
58
59
60 ;(defun non-saved-text-mode ()
61 ; "Like text-mode, but delete auto save file when file is saved for real."
62 ; (text-mode)
63 ; (make-local-variable 'delete-auto-save-files)
64 ; (setq delete-auto-save-files t))
65
66 (defun text-mode ()
67 "Major mode for editing text intended for humans to read.
68 Special commands:\\{text-mode-map}
69 Turning on Text mode calls the value of the variable `text-mode-hook',
70 if that value is non-nil."
71 (interactive)
72 (kill-all-local-variables)
73 (use-local-map text-mode-map)
74 (setq mode-name "Text")
75 (setq major-mode 'text-mode)
76 (setq local-abbrev-table text-mode-abbrev-table)
77 (set-syntax-table text-mode-syntax-table)
78 (run-hooks 'text-mode-hook))
79
80 (defvar indented-text-mode-map ()
81 "Keymap for Indented Text mode.
82 All the commands defined in Text mode are inherited unless overridden.")
83
84 (if indented-text-mode-map
85 ()
86 ;; Make different definition for TAB before the one in text-mode-map, but
87 ;; share the rest.
88 (setq indented-text-mode-map (make-sparse-keymap))
89 (set-keymap-name indented-text-mode-map 'indented-text-mode-map)
90 (set-keymap-parents indented-text-mode-map (list text-mode-map))
91 (define-key indented-text-mode-map "\t" 'indent-relative))
92
93 (defun indented-text-mode ()
94 "Major mode for editing text with indented paragraphs.
95 In this mode, paragraphs are delimited only by blank lines.
96 You can thus get the benefit of adaptive filling
97 (see the variable `adaptive-fill-mode').
98 \\{indented-text-mode-map}
99 Turning on `indented-text-mode' calls the value of the variable
100 `text-mode-hook', if that value is non-nil."
101 (interactive)
102 (kill-all-local-variables)
103 (use-local-map text-mode-map)
104 (define-abbrev-table 'text-mode-abbrev-table ())
105 (setq local-abbrev-table text-mode-abbrev-table)
106 (set-syntax-table text-mode-syntax-table)
107 (make-local-variable 'indent-line-function)
108 (setq indent-line-function 'indent-relative-maybe)
109 (make-local-variable 'paragraph-start)
110 (setq paragraph-start (concat "$\\|" page-delimiter))
111 (make-local-variable 'paragraph-separate)
112 (setq paragraph-separate paragraph-start)
113 (use-local-map indented-text-mode-map)
114 (setq mode-name "Indented Text")
115 (setq major-mode 'indented-text-mode)
116 (run-hooks 'text-mode-hook 'indented-text-mode-hook))
117
118 (defun center-paragraph ()
119 "Center each nonblank line in the paragraph at or after point.
120 See `center-line' for more info."
121 (interactive)
122 (save-excursion
123 (forward-paragraph)
124 (or (bolp) (newline 1))
125 (let ((end (point)))
126 (backward-paragraph)
127 (center-region (point) end))))
128
129 (defun center-region (from to)
130 "Center each nonblank line starting in the region.
131 See `center-line' for more info."
132 (interactive "r")
133 (if (> from to)
134 (let ((tem to))
135 (setq to from from tem)))
136 (save-excursion
137 (save-restriction
138 (narrow-to-region from to)
139 (goto-char from)
140 (while (not (eobp))
141 (or (save-excursion (skip-chars-forward " \t") (eolp))
142 (center-line))
143 (forward-line 1)))))
144
145 (defun center-line (&optional nlines)
146 "Center the line point is on, within the width specified by `fill-column'.
147 This means adjusting the indentation so that it equals
148 the distance between the end of the text and `fill-column'.
149 The argument NLINES says how many lines to center."
150 (interactive "P")
151 (if nlines (setq nlines (prefix-numeric-value nlines)))
152 (while (not (eq nlines 0))
153 (save-excursion
154 (let ((lm (current-left-margin))
155 line-length)
156 (beginning-of-line)
157 (delete-horizontal-space)
158 (end-of-line)
159 (delete-horizontal-space)
160 (setq line-length (current-column))
161 (if (> (- fill-column lm line-length) 0)
162 (indent-line-to
163 (+ lm (/ (- fill-column lm line-length) 2))))))
164 (cond ((null nlines)
165 (setq nlines 0))
166 ((> nlines 0)
167 (setq nlines (1- nlines))
168 (forward-line 1))
169 ((< nlines 0)
170 (setq nlines (1+ nlines))
171 (forward-line -1)))))
172
173 ;;; text-mode.el ends here