;;; longlines.el --- automatically wrap long lines
-;; Copyright (C) 2000, 2001, 2004, 2005, 2006 Free Software Foundation, Inc.
+;; Copyright (C) 2000, 2001, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
;; Authors: Kai Grossjohann <Kai.Grossjohann@CS.Uni-Dortmund.DE>
;; Alex Schroeder <alex@gnu.org>
;; 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 2, or (at your option)
+;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
"Non-nil means wrapping and filling happen at the edge of the window.
Otherwise, `fill-column' is used, regardless of the window size. This
does not work well when the buffer is displayed in multiple windows
-with differing widths."
+with differing widths.
+
+If the value is an integer, that specifies the distance from the
+right edge of the window at which wrapping occurs. For any other
+non-nil value, wrapping occurs 2 characters from the right edge."
:group 'longlines
:type 'boolean)
"Non-nil means each hard newline is marked on the screen.
\(The variable `longlines-show-effect' controls what they look like.)
You can also enable the display temporarily, using the command
-`longlines-show-hard-newlines'"
+`longlines-show-hard-newlines'."
:group 'longlines
:type 'boolean)
(defvar longlines-wrap-end nil)
(defvar longlines-wrap-point nil)
(defvar longlines-showing nil)
+(defvar longlines-decoded nil)
(make-variable-buffer-local 'longlines-wrap-beg)
(make-variable-buffer-local 'longlines-wrap-end)
(make-variable-buffer-local 'longlines-wrap-point)
(make-variable-buffer-local 'longlines-showing)
+(make-variable-buffer-local 'longlines-decoded)
;; Mode
+(defvar message-indent-citation-function)
+
;;;###autoload
(define-minor-mode longlines-mode
"Toggle Long Lines mode.
(add-hook 'change-major-mode-hook 'longlines-mode-off nil t)
(add-hook 'before-revert-hook 'longlines-before-revert-hook nil t)
(make-local-variable 'buffer-substring-filters)
+ (make-local-variable 'longlines-auto-wrap)
(set (make-local-variable 'isearch-search-fun-function)
'longlines-search-function)
(add-to-list 'buffer-substring-filters 'longlines-encode-string)
(when longlines-wrap-follows-window-size
- (set (make-local-variable 'fill-column)
- (- (window-width) window-min-width))
+ (let ((dw (if (and (integerp longlines-wrap-follows-window-size)
+ (>= longlines-wrap-follows-window-size 0)
+ (< longlines-wrap-follows-window-size
+ (window-width)))
+ longlines-wrap-follows-window-size
+ 2)))
+ (set (make-local-variable 'fill-column)
+ (- (window-width) dw)))
(add-hook 'window-configuration-change-hook
'longlines-window-change-function nil t))
(let ((buffer-undo-list t)
(inhibit-read-only t)
(after-change-functions nil)
- (mod (buffer-modified-p)))
+ (mod (buffer-modified-p))
+ buffer-file-name buffer-file-truename)
;; Turning off undo is OK since (spaces + newlines) is
;; conserved, except for a corner case in
;; longlines-wrap-lines that we'll never encounter from here
(save-restriction
(widen)
- (longlines-decode-buffer)
+ (unless longlines-decoded
+ (longlines-decode-buffer)
+ (setq longlines-decoded t))
(longlines-wrap-region (point-min) (point-max)))
(set-buffer-modified-p mod))
(when (and longlines-show-hard-newlines
(add-to-list 'message-indent-citation-function
'longlines-decode-region t)))
+ (add-hook 'after-change-functions 'longlines-after-change-function nil t)
+ (add-hook 'post-command-hook 'longlines-post-command-function nil t)
(when longlines-auto-wrap
- (auto-fill-mode 0)
- (add-hook 'after-change-functions
- 'longlines-after-change-function nil t)
- (add-hook 'post-command-hook
- 'longlines-post-command-function nil t)))
+ (auto-fill-mode 0)))
;; Turn off longlines mode
(setq buffer-file-format (delete 'longlines buffer-file-format))
(if longlines-showing
(longlines-unshow-hard-newlines))
(let ((buffer-undo-list t)
(after-change-functions nil)
- (inhibit-read-only t))
- (save-restriction
- (widen)
- (longlines-encode-region (point-min) (point-max))))
+ (inhibit-read-only t)
+ buffer-file-name buffer-file-truename)
+ (if longlines-decoded
+ (save-restriction
+ (widen)
+ (longlines-encode-region (point-min) (point-max))
+ (setq longlines-decoded nil))))
(remove-hook 'change-major-mode-hook 'longlines-mode-off t)
(remove-hook 'after-change-functions 'longlines-after-change-function t)
(remove-hook 'post-command-hook 'longlines-post-command-function t)
"Make hard newlines visible by adding a face.
With optional argument ARG, make the hard newlines invisible again."
(interactive "P")
- (let ((buffer-undo-list t)
- (mod (buffer-modified-p)))
(if arg
(longlines-unshow-hard-newlines)
(setq longlines-showing t)
- (longlines-show-region (point-min) (point-max)))
- (set-buffer-modified-p mod)))
+ (longlines-show-region (point-min) (point-max))))
(defun longlines-show-region (beg end)
"Make hard newlines between BEG and END visible."
(let* ((pmin (min beg end))
(pmax (max beg end))
(pos (text-property-not-all pmin pmax 'hard nil))
- (inhibit-read-only t))
+ (mod (buffer-modified-p))
+ (buffer-undo-list t)
+ (inhibit-read-only t)
+ (inhibit-modification-hooks t)
+ buffer-file-name buffer-file-truename)
(while pos
(put-text-property pos (1+ pos) 'display
- (copy-sequence longlines-show-effect))
- (setq pos (text-property-not-all (1+ pos) pmax 'hard nil)))))
+ (copy-sequence longlines-show-effect))
+ (setq pos (text-property-not-all (1+ pos) pmax 'hard nil)))
+ (restore-buffer-modified-p mod)))
(defun longlines-unshow-hard-newlines ()
"Make hard newlines invisible again."
(interactive)
(setq longlines-showing nil)
- (let ((pos (text-property-not-all (point-min) (point-max) 'hard nil)))
+ (let ((pos (text-property-not-all (point-min) (point-max) 'hard nil))
+ (mod (buffer-modified-p))
+ (buffer-undo-list t)
+ (inhibit-read-only t)
+ (inhibit-modification-hooks t)
+ buffer-file-name buffer-file-truename)
(while pos
(remove-text-properties pos (1+ pos) '(display))
- (setq pos (text-property-not-all (1+ pos) (point-max) 'hard nil)))))
+ (setq pos (text-property-not-all (1+ pos) (point-max) 'hard nil)))
+ (restore-buffer-modified-p mod)))
;; Wrapping the paragraphs.
"Wrap each successive line, starting with the line before BEG.
Stop when we reach lines after END that don't need wrapping, or the
end of the buffer."
- (setq longlines-wrap-point (point))
- (goto-char beg)
- (forward-line -1)
- ;; Two successful longlines-wrap-line's in a row mean successive
- ;; lines don't need wrapping.
- (while (null (and (longlines-wrap-line)
- (or (eobp)
- (and (>= (point) end)
- (longlines-wrap-line))))))
- (goto-char longlines-wrap-point))
+ (let ((mod (buffer-modified-p)))
+ (setq longlines-wrap-point (point))
+ (goto-char beg)
+ (forward-line -1)
+ ;; Two successful longlines-wrap-line's in a row mean successive
+ ;; lines don't need wrapping.
+ (while (null (and (longlines-wrap-line)
+ (or (eobp)
+ (and (>= (point) end)
+ (longlines-wrap-line))))))
+ (goto-char longlines-wrap-point)
+ (set-buffer-modified-p mod)))
(defun longlines-wrap-line ()
"If the current line needs to be wrapped, wrap it and return nil.
(if (> longlines-wrap-point (point))
(setq longlines-wrap-point
(1- longlines-wrap-point))))
- (insert-before-markers-and-inherit ?\ )
+ (insert-before-markers-and-inherit ?\s)
(backward-char 1)
(delete-char -1)
(forward-char 1))
;; Auto wrap
(defun longlines-auto-wrap (&optional arg)
- "Turn on automatic line wrapping, and wrap the entire buffer.
-With optional argument ARG, turn off line wrapping."
+ "Toggle automatic line wrapping.
+With optional argument ARG, turn on line wrapping if and only if ARG is positive.
+If automatic line wrapping is turned on, wrap the entire buffer."
(interactive "P")
- (remove-hook 'after-change-functions 'longlines-after-change-function t)
- (remove-hook 'post-command-hook 'longlines-post-command-function t)
+ (setq arg (if arg
+ (> (prefix-numeric-value arg) 0)
+ (not longlines-auto-wrap)))
(if arg
- (progn (setq longlines-auto-wrap nil)
- (message "Auto wrap disabled."))
- (setq longlines-auto-wrap t)
- (add-hook 'after-change-functions
- 'longlines-after-change-function nil t)
- (add-hook 'post-command-hook
- 'longlines-post-command-function nil t)
- (let ((mod (buffer-modified-p)))
- (longlines-wrap-region (point-min) (point-max))
- (set-buffer-modified-p mod))
- (message "Auto wrap enabled.")))
+ (progn
+ (setq longlines-auto-wrap t)
+ (longlines-wrap-region (point-min) (point-max))
+ (message "Auto wrap enabled."))
+ (setq longlines-auto-wrap nil)
+ (message "Auto wrap disabled.")))
(defun longlines-after-change-function (beg end len)
"Update `longlines-wrap-beg' and `longlines-wrap-end'.
This is called by `after-change-functions' to keep track of the region
that has changed."
- (unless undo-in-progress
+ (when (and longlines-auto-wrap (not undo-in-progress))
(setq longlines-wrap-beg
(if longlines-wrap-beg (min longlines-wrap-beg beg) beg))
(setq longlines-wrap-end
(defun longlines-post-command-function ()
"Perform line wrapping on the parts of the buffer that have changed.
This is called by `post-command-hook' after each command."
- (when longlines-wrap-beg
+ (when (and longlines-auto-wrap longlines-wrap-beg)
(if (or (eq this-command 'yank)
(eq this-command 'yank-pop))
(longlines-decode-region (point) (mark t)))
(defun longlines-window-change-function ()
"Re-wrap the buffer if the window width has changed.
This is called by `window-configuration-change-hook'."
- (when (/= fill-column (- (window-width) window-min-width))
- (setq fill-column (- (window-width) window-min-width))
- (let ((mod (buffer-modified-p)))
- (longlines-wrap-region (point-min) (point-max))
- (set-buffer-modified-p mod))))
+ (let ((dw (if (and (integerp longlines-wrap-follows-window-size)
+ (>= longlines-wrap-follows-window-size 0)
+ (< longlines-wrap-follows-window-size (window-width)))
+ longlines-wrap-follows-window-size
+ 2)))
+ (when (/= fill-column (- (window-width) dw))
+ (setq fill-column (- (window-width) dw))
+ (longlines-wrap-region (point-min) (point-max)))))
;; Isearch