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+;; Text mode, and its ideosyncratic commands.
+;; Copyright (C) 1985 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+(defvar text-mode-syntax-table nil
+ "Syntax table used while in text mode.")
+
+(defvar text-mode-abbrev-table nil
+ "Abbrev table used while in text mode.")
+(define-abbrev-table 'text-mode-abbrev-table ())
+
+(if text-mode-syntax-table
+ ()
+ (setq text-mode-syntax-table (make-syntax-table))
+ (modify-syntax-entry ?\" ". " text-mode-syntax-table)
+ (modify-syntax-entry ?\\ ". " text-mode-syntax-table)
+ (modify-syntax-entry ?' "w " text-mode-syntax-table))
+
+(defvar text-mode-map nil
+ "Keymap for Text mode.
+Many other modes, such as Mail mode, Outline mode and Indented Text mode,
+inherit all the commands defined in this map.")
+
+(if text-mode-map
+ ()
+ (setq text-mode-map (make-sparse-keymap))
+ (define-key text-mode-map "\t" 'tab-to-tab-stop)
+ (define-key text-mode-map "\es" 'center-line)
+ (define-key text-mode-map "\eS" 'center-paragraph))
+
+
+;(defun non-saved-text-mode ()
+; "Like text-mode, but delete auto save file when file is saved for real."
+; (text-mode)
+; (make-local-variable 'delete-auto-save-files)
+; (setq delete-auto-save-files t))
+
+(defun text-mode ()
+ "Major mode for editing text intended for humans to read. Special commands:\\{text-mode-map}
+Turning on text-mode calls the value of the variable `text-mode-hook',
+if that value is non-nil."
+ (interactive)
+ (kill-all-local-variables)
+ (use-local-map text-mode-map)
+ (setq mode-name "Text")
+ (setq major-mode 'text-mode)
+ (setq local-abbrev-table text-mode-abbrev-table)
+ (set-syntax-table text-mode-syntax-table)
+ (run-hooks 'text-mode-hook))
+
+(defvar indented-text-mode-map ()
+ "Keymap for Indented Text mode.
+All the commands defined in Text mode are inherited unless overridden.")
+
+(if indented-text-mode-map
+ ()
+ (setq indented-text-mode-map (nconc (make-sparse-keymap) text-mode-map))
+ (define-key indented-text-mode-map "\t" 'indent-relative))
+
+(defun indented-text-mode ()
+ "Major mode for editing indented text intended for humans to read.\\{indented-text-mode-map}
+Turning on indented-text-mode calls the value of the variable `text-mode-hook',
+if that value is non-nil."
+ (interactive)
+ (kill-all-local-variables)
+ (use-local-map text-mode-map)
+ (define-abbrev-table 'text-mode-abbrev-table ())
+ (setq local-abbrev-table text-mode-abbrev-table)
+ (set-syntax-table text-mode-syntax-table)
+ (make-local-variable 'indent-line-function)
+ (setq indent-line-function 'indent-relative-maybe)
+ (use-local-map indented-text-mode-map)
+ (setq mode-name "Indented Text")
+ (setq major-mode 'indented-text-mode)
+ (run-hooks 'text-mode-hook))
+
+(defun change-log-mode ()
+ "Major mode for editing ChangeLog files. See M-x add-change-log-entry.
+Almost the same as Indented Text mode, but prevents numeric backups
+and sets `left-margin' to 8 and `fill-column' to 74."
+ (interactive)
+ (indented-text-mode)
+ (setq left-margin 8)
+ (setq fill-column 74)
+ (make-local-variable 'version-control)
+ (setq version-control 'never)
+ (run-hooks 'change-log-mode-hook))
+
+(defun center-paragraph ()
+ "Center each nonblank line in the paragraph at or after point.
+See center-line for more info."
+ (interactive)
+ (save-excursion
+ (forward-paragraph)
+ (or (bolp) (newline 1))
+ (let ((end (point)))
+ (backward-paragraph)
+ (center-region (point) end))))
+
+(defun center-region (from to)
+ "Center each nonblank line starting in the region.
+See center-line for more info."
+ (interactive "r")
+ (if (> from to)
+ (let ((tem to))
+ (setq to from from tem)))
+ (save-excursion
+ (save-restriction
+ (narrow-to-region from to)
+ (goto-char from)
+ (while (not (eobp))
+ (or (save-excursion (skip-chars-forward " \t") (eolp))
+ (center-line))
+ (forward-line 1)))))
+
+(defun center-line ()
+ "Center the line point is on, within the width specified by `fill-column'.
+This means adjusting the indentation so that it equals
+the distance between the end of the text and `fill-column'."
+ (interactive)
+ (save-excursion
+ (let (line-length)
+ (beginning-of-line)
+ (delete-horizontal-space)
+ (end-of-line)
+ (delete-horizontal-space)
+ (setq line-length (current-column))
+ (beginning-of-line)
+ (indent-to
+ (+ left-margin
+ (/ (- fill-column left-margin line-length) 2))))))