# 4.4BSD/usr/src/contrib/emacs-18.57/lisp/text-mode.el

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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
;; 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 "")
(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 ())
(if indented-text-mode-map
()
(setq indented-text-mode-map (make-sparse-keymap))
(define-key indented-text-mode-map "\t" 'indent-relative)
(define-key indented-text-mode-map "\es" 'center-line)
(define-key indented-text-mode-map "\eS" 'center-paragraph))

(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 center-paragraph ()
"Center each line in the paragraph at or after point.
(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 line starting in the region.
(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))
(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 to match
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))))))
```