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17c3470ee8
emacs/lisp/textmodes/two-column.el
Richard M. Stallman 17c3470ee8 (2C-two-columns): Doc fix.
1996-10-12 02:31:48 +00:00

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;;; two-column.el --- minor mode for editing of two-column text
;; Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
;; Author: Daniel.Pfeiffer@Informatik.START.dbp.de, fax (+49 69) 7588-2389
;; Adapted-By: ESR, Daniel Pfeiffer
;; Esperanto: English:
;; ^Ci dosiero estas ero de GNU Emacs. This file is part of GNU Emacs.
;; GNU Emacs estas libera programaro; GNU Emacs is free software; you can
;; vi povas disdoni ^gin kaj/a^u modifi redistribute it and/or modify it
;; ^gin sub la kondi^coj de la GNU under the terms of the GNU General
;; ^Generala Publika Licenco kiel pub- Public License as published by the
;; likigita far la Liberprogramara Fon- Free Software Foundation; either
;; da^jo; a^u eldono 2a, a^u (la^u via version 2, or (at your option) any
;; elekto) ajna posta eldono. later version.
;; GNU Emacs estas disdonata en la GNU Emacs is distributed in the hope
;; espero ke ^gi estos utila, sed SEN that it will be useful, but WITHOUT
;; IA GARANTIO; sen e^c la implicita ANY WARRANTY; without even the
;; garantio de VENDEBLECO a^u PRETECO implied warranty of MERCHANTABILITY
;; POR DETERMINITA CELO. Vidu la GNU or FITNESS FOR A PARTICULAR PURPOSE.
;; ^Generala Publika Licenco por plenaj See the GNU General Public License
;; detaloj. for more details.
;; Vi devus ricevinti kopion de la GNU You should have received a copy of
;; ^Generala Publika Licenco kune kun the GNU General Public License along
;; GNU Emacs; vidu la dosieron COPYING. with GNU Emacs; see the file
;; Alikaze skribu al la COPYING. If not, write to the
;; Free Software Foundation, 59 Temple Place - Suite 330
;; Boston, MA 02111-1307, USA.
;;; Komentario: Commentary:
;; Tiu programaro ebligas vin redakti This package gives you the ability
;; dukolumnan tekston. to edit text in a two-column format.
;; Vi havas tri eblecojn por eki tiun You have three ways to start up this
;; mal^cefan modalon. ^Ciu donas al vi minor mode. Each gives you a
;; horizontale disigatan fenestron, si- horizontally split window similar to
;; milan al fina apareco de via teksto: the final outcome of your text:
;; f2 2 asocias novan bufron nomatan associates a new buffer called
;; C-x 6 2 same, sed kun 2C/ anta^u. the same, but with 2C/
;; prepended.
;; f2 b asocias alian bufron. Vi povas associates another buffer.
;; C-x 6 b anka^u asocii dataron, se vi This can be used to associate a
;; ^jus anta^ue faris C-x C-f. file if you just did C-x C-f.
;; f2 s disigas jam dukolumnan tekston splits a two-column text into
;; C-x 6 s en du bufroj ekde la nuna two buffers from the current
;; linio, kaj je la nuna kolumno. line and at the current column.
;; La anta^uaj signoj (ofte The preceding characters (often
;; tabeligilo a^u |) estas la tab or |) are the column
;; kolumna disiganto. Linioj kiuj separator. Lines that don't
;; ne enhavas ilin ne estas have them won't be separated.
;; disigitaj. Kiel la kvara kaj Like the fourth and fifth line
;; la kvina linio se vi disigas if you split this file from
;; ^ci dataron ekde la unua angla the first english word.
;; vorto.
;; Se vi volas meti longajn liniojn If you include long lines, i.e which
;; (ekz. programerojn) en la kunigotan will span both columns (eg. source
;; tekston, ili devas esti en la code), they should be in what will
;; estonte unua kolumno. La alia devas be the first column, with the
;; havi vakajn linion apud ili. associated buffer having empty lines
;; next to them.
;; Averto: en Emacs kiam vi ^san^gas la Attention: in Emacs when you change
;; ^cefan modalon, la mal^cefaj modaloj the major mode, the minor modes are
;; estas anka^u elmemorigitaj. Tiu- also purged from memory. In that
;; okaze vi devas religi la du bufrojn case you must reassociate the two
;; per iu C-x 6-ordono, ekz. C-x 6 b. buffers with any C-x 6-command, e.g.
;; C-x 6 b.
;; Kiam vi estos kontenta de la When you have edited both buffers to
;; rezulto, vi kunmetos la du kolumnojn your content, you merge them with
;; per C-x 6 1. Se vi poste vidas C-x 6 1. If you then see a problem,
;; problemon, vi neniigu la kunmeton you undo the merge with C-x u and
;; per C-x u kaj plue modifu la du continue to edit the two buffers.
;; bufrojn. Kiam vi ne plu volas tajpi When you no longer want to edit in
;; dukolumne, vi eliru el la mal^cefa two columns, you turn off the minor
;; modalo per C-x 6 d. mode with C-x 6 d.
;; Aldone al dukolumna redaktado, ek- In addition to two-column editing of
;; zemple por skribi dulingvan tekston text, for example for writing a
;; flank-al-flanke kiel ^ci tiu, aliaj bilingual text side-by-side as shown
;; interesaj uzoj trovitas por tiu mal- here, other interesting uses have
;; ^cefa modalo: been found for this minor mode:
;; Vi povas disigi la kolumnojn per {+} You can separate the columns with
;; ajna pla^ca ^ceno starigante {+} any string that pleases you, by
;; `2C-separator'. Ekzemple "{+} " {+} setting `2C-separator'. For example
;; por amuzi^gi. f2 s a^u C-x 6 s {+} "{+} " if you'd like to have fun.
;; traktas tiujn kun prefiksa {+} f2 s or C-x 6 s handles these with a
;; argumento kiu signifas la longon {+} prefix argument that means the
;; de tia ^ceno. {+} desired length of such a string.
;; Programistoj eble ^satus la eblecon Programmers might like the ability
;; forspliti la komentarian kolumnon de to split off the comment column of a
;; dosiero kiel la sekvanta. Vi povas file that looks like the following.
;; rearan^gigi la paragrafon. La pro- You can fill-paragraph the comment.
;; blemo estas ke koda^jo tuj lar- The problem is, code quickly gets
;; ^gi^gas, tiel ke vi bezonas pli rather wide, so you need to use a
;; mallar^gan komentarian kolumnon. narrower comment column. Code lines
;; Koda^jaj linioj tra `comment-column' that reach beyond `comment-column'
;; ne problemas, krom ke vi ne vidos are no problem, except that you
;; iliajn finojn dum redaktado. won't see their end during editing.
;; BEGIN -- This is just some meaningless
;; FOR i IN 1..10 LOOP -- code in Ada, that runs foobar
;; foobar( i ); -- once for each argument from one
;; END LOOP; -- to ten, and then we're already
;; END; -- through with it.
;; Pli bone ankora^u, vi povas pozici- Better yet, you can put the point
;; i^gi anta^u "This", tajpi M-3 f2 s before "This", type M-3 f2 s
;; kiu igas "-- " la separigilon inter which makes "-- " the separator
;; senkomentaria Ada bufro kaj nur- between a no-comments Ada buffer,
;; teksta komentaria bufro. Kiam vi and a plain text comment buffer.
;; denove kuni^gos ilin, ^ciu nevaka When you put them back together,
;; linio de l' dua kolumno denove every non-empty line of the 2nd
;; anta^uhavos "-- ". column will again be preceded by
;; "-- ".
;;; Code:
;; Lucid patch
(or (fboundp 'frame-width)
(fset 'frame-width 'screen-width))
;;;;; Set up keymap ;;;;;
(defvar 2C-mode-map
(let ((map (make-sparse-keymap)))
(define-key map "2" '2C-two-columns)
(define-key map [f2] '2C-two-columns)
(define-key map "b" '2C-associate-buffer)
(define-key map "s" '2C-split)
map)
"Keymap for commands for setting up two-column mode.")
;;;###autoload (autoload '2C-command "two-column" () t 'keymap)
(fset '2C-command 2C-mode-map)
;;;###autoload
;; This one is for historical reasons and simple keyboards, it is not
;; at all mnemonic. All usual sequences containing 2 were used, and
;; f2 could not be set up in a standard way under Emacs 18.
(global-set-key "\C-x6" '2C-command)
;;;###autoload
(global-set-key [f2] '2C-command)
(defvar 2C-minor-mode-map
(let ((map (make-sparse-keymap)))
(define-key map "1" '2C-merge)
(define-key map "d" '2C-dissociate)
(define-key map "o" '2C-associated-buffer)
(define-key map "\^m" '2C-newline)
(define-key map "|" '2C-toggle-autoscroll)
(define-key map "{" '2C-shrink-window-horizontally)
(define-key map "}" '2C-enlarge-window-horizontally)
map)
"Keymap for commands for use in two-column mode.")
(setq minor-mode-map-alist
(cons (cons '2C-mode
(let ((map (make-sparse-keymap)))
(substitute-key-definition '2C-command 2C-minor-mode-map
map (current-global-map))
(substitute-key-definition 'enlarge-window-horizontally
'2C-enlarge-window-horizontally
map (current-global-map))
(substitute-key-definition 'shrink-window-horizontally
'2C-shrink-window-horizontally
map (current-global-map))
map))
minor-mode-map-alist))
;;;;; variable declarations ;;;;;
;; Markers seem to be the only buffer-id not affected by renaming a buffer.
;; This nevertheless loses when a buffer is killed. The variable-name is
;; required by `describe-mode'.
(defvar 2C-mode nil
"Marker to the associated buffer, if non-nil.")
(make-variable-buffer-local '2C-mode)
(put '2C-mode 'permanent-local t)
(setq minor-mode-alist (cons '(2C-mode " 2C") minor-mode-alist))
;; rearranged, so that the pertinent info will show in 40 columns
(defvar 2C-mode-line-format
'("-%*- %15b --" (-3 . "%p") "--%[(" mode-name
minor-mode-alist "%n" mode-line-process ")%]%-")
"*Value of mode-line-format for a buffer in two-column minor mode.")
(defvar 2C-other-buffer-hook 'text-mode
"*Hook run in new buffer when it is associated with current one.")
(defvar 2C-separator ""
"*A string inserted between the two columns when merging.
This gets set locally by \\[2C-split].")
(put '2C-separator 'permanent-local t)
(defvar 2C-window-width 40
"*The width of the first column. (Must be at least `window-min-width')
This value is local for every buffer that sets it.")
(make-variable-buffer-local '2C-window-width)
(put '2C-window-width 'permanent-local t)
(defvar 2C-beyond-fill-column 4
"*Base for calculating `fill-column' for a buffer in two-column minor mode.
The value of `fill-column' becomes `2C-window-width' for this buffer
minus this value.")
(defvar 2C-autoscroll t
"If non-nil, Emacs attempts to keep the two column's buffers aligned.")
(defvar 2C-autoscroll-start nil)
(make-variable-buffer-local '2C-autoscroll-start)
;;;;; base functions ;;;;;
;; The access method for the other buffer. This tries to remedy against
;; lost local variables and lost buffers.
(defun 2C-other (&optional req)
(or (if 2C-mode
(or (prog1
(marker-buffer 2C-mode)
(setq mode-line-format 2C-mode-line-format))
;; The associated buffer somehow got killed.
(progn
;; The other variables may later be useful if the user
;; reestablishes the association.
(kill-local-variable '2C-mode)
(kill-local-variable 'mode-line-format)
nil)))
(if req (error "You must first set two-column minor mode."))))
;; function for setting up two-column minor mode in a buffer associated
;; with the buffer pointed to by the marker other.
(defun 2C-mode (other)
"Minor mode for independently editing two columns.
This is set up for two associated buffers by the three commands bound
to \\[2C-two-columns] , \\[2C-associate-buffer] and \\[2C-split].
Turning on two-column mode calls the value of the variable `2C-mode-hook',
if that value is non-nil.
These buffers can be edited separately, for example with `fill-paragraph'.
If you want to disable parallel scrolling temporarily, use \\[2C-toggle-autoscroll] .
If you include long lines, i.e which will span both columns (eg.
source code), they should be in what will be the first column, with
the associated buffer having empty lines next to them.
Potential uses are writing bilingual texts, or editing the comments of a
source code. See the file lisp/two-column.el for detailed examples.
You have the following commands at your disposal:
\\[2C-two-columns] Rearrange screen with current buffer first
\\[2C-associate-buffer] Reassociate buffer after changing major mode
\\[shrink-window-horizontally], \\[enlarge-window-horizontally] Shrink, enlarge current column
\\[2C-associated-buffer] Switch to associated buffer at same point
\\[2C-newline] Insert newline(s) in both buffers at same point
\\[2C-merge] Merge both buffers
\\[2C-dissociate] Dissociate the two buffers
These keybindings can be customized in your ~/.emacs by `2C-mode-map',
`2C-minor-mode-map' and by binding `2C-command' to some prefix.
The appearance of the screen can be customized by the variables
`2C-window-width', `2C-beyond-fill-column', `2C-mode-line-format' and
`truncate-partial-width-windows'."
(make-local-hook 'post-command-hook)
(add-hook 'post-command-hook '2C-autoscroll nil t)
(setq fill-column (- 2C-window-width
2C-beyond-fill-column)
mode-line-format 2C-mode-line-format
2C-mode other)
(run-hooks '2C-mode-hook))
;;;###autoload
(defun 2C-two-columns (&optional buffer)
"Split current window vertically for two-column editing.
When called the first time, associates a buffer with the current
buffer in two-column minor mode (see \\[describe-mode] ).
Runs `2C-other-buffer-hook' in the new buffer.
When called again, restores the screen layout with the current buffer
first and the associated buffer to its right."
(interactive "P")
;; first go to full width, so that we can certainly split into two windows
(if (< (window-width) (frame-width))
(enlarge-window 99999 t))
(split-window-horizontally
(max window-min-width (min 2C-window-width
(- (frame-width) window-min-width))))
(if (2C-other)
(progn
(other-window 1)
(switch-to-buffer (2C-other))
(other-window -1)
(if 2C-autoscroll
(2C-toggle-autoscroll t)))
(2C-mode (prog1 (point-marker)
(other-window 1)
(switch-to-buffer
(or buffer
(generate-new-buffer (concat "2C/" (buffer-name)))))
(or buffer
(run-hooks '2C-other-buffer-hook))))
(2C-mode (prog1 (point-marker)
(other-window -1)))))
;;;###autoload
(defun 2C-associate-buffer ()
"Associate another buffer with this one in two-column minor mode.
Can also be used to associate a just previously visited file, by
accepting the proposed default buffer.
\(See \\[describe-mode] .)"
(interactive)
(let ((b1 (current-buffer))
(b2 (or (2C-other)
(read-buffer "Associate buffer: " (other-buffer)))))
(save-excursion
(setq 2C-mode nil)
(set-buffer b2)
(and (2C-other)
(not (eq b1 (2C-other)))
(error "Buffer already associated with buffer `%s'."
(buffer-name (2C-other))))
(setq b1 (and (assq '2C-window-width (buffer-local-variables))
2C-window-width)))
; if other buffer has a local width, adjust here too
(if b1 (setq 2C-window-width (- (frame-width) b1)))
(2C-two-columns b2)))
;;;###autoload
(defun 2C-split (arg)
"Split a two-column text at point, into two buffers in two-column minor mode.
Point becomes the local value of `2C-window-width'. Only lines that
have the ARG same preceding characters at that column get split. The
ARG preceding characters without any leading whitespace become the local
value for `2C-separator'. This way lines that continue across both
columns remain untouched in the first buffer.
This function can be used with a prototype line, to set up things. You
write the first line of each column and then split that line. E.g.:
First column's text sSs Second column's text
\\___/\\
/ \\
5 character Separator You type M-5 \\[2C-split] with the point here.
\(See \\[describe-mode] .)"
(interactive "*p")
(and (2C-other)
(if (y-or-n-p (concat "Overwrite associated buffer `"
(buffer-name (2C-other))
"'? "))
(save-excursion
(set-buffer (2C-other))
(erase-buffer))
(signal 'quit nil)))
(let ((point (point))
; make next-line always come back to same column
(goal-column (current-column))
; a counter for empty lines in other buffer
(n (1- (count-lines (point-min) (point))))
chars other)
(save-excursion
(backward-char arg)
(setq chars (buffer-substring (point) point))
(skip-chars-forward " \t" point)
(make-local-variable '2C-separator)
(setq 2C-separator (buffer-substring (point) point)
2C-window-width (current-column)))
(2C-two-columns)
(setq other (2C-other))
; now we're ready to actually split
(save-excursion
(while (not (eobp))
(if (not (and (= (current-column) goal-column)
(string= chars
(buffer-substring (point)
(save-excursion
(backward-char arg)
(point))))))
(setq n (1+ n))
(setq point (point))
(backward-char arg)
(skip-chars-backward " \t")
(delete-region point (point))
(setq point (point))
(insert-char ?\n n)
(append-to-buffer other point (progn (end-of-line)
(if (eobp)
(point)
(1+ (point)))))
(delete-region point (point))
(setq n 0))
(next-line 1)))))
(defun 2C-dissociate ()
"Turn off two-column minor mode in current and associated buffer.
If the associated buffer is unmodified and empty, it is killed."
(interactive)
(let ((buffer (current-buffer)))
(save-excursion
(and (2C-other)
(set-buffer (2C-other))
(or (not (2C-other))
(eq buffer (2C-other)))
(if (and (not (buffer-modified-p))
(eobp) (bobp))
(kill-buffer nil)
(kill-local-variable '2C-mode)
(kill-local-variable '2C-window-width)
(kill-local-variable '2C-separator)
(kill-local-variable 'mode-line-format)
(kill-local-variable 'fill-column))))
(kill-local-variable '2C-mode)
(kill-local-variable '2C-window-width)
(kill-local-variable '2C-separator)
(kill-local-variable 'mode-line-format)
(kill-local-variable 'fill-column)))
;; this doesn't use yank-rectangle, so that the first column can
;; contain long lines
(defun 2C-merge ()
"Merges the associated buffer with the current buffer.
They get merged at the column, which is the value of `2C-window-width',
i.e. usually at the vertical window separator. This separator gets
replaced with white space. Beyond that the value of `2C-separator' gets
inserted on merged lines. The two columns are thus pasted side by side,
in a single text. If the other buffer is not displayed to the left of
this one, then this one becomes the left column.
If you want `2C-separator' on empty lines in the second column,
you should put just one space in them. In the final result, you can strip
off trailing spaces with \\[beginning-of-buffer] \\[replace-regexp] [ SPC TAB ] + $ RET RET"
(interactive)
(and (> (car (window-edges)) 0) ; not touching left edge of screen
(eq (window-buffer (previous-window))
(2C-other t))
(other-window -1))
(save-excursion
(let ((b1 (current-buffer))
(b2 (2C-other t))
string)
(goto-char (point-min))
(set-buffer b2)
(goto-char (point-min))
(while (not (eobp))
(setq string (buffer-substring (point)
(progn (end-of-line) (point))))
(or (eobp)
(forward-char)) ; next line
(set-buffer b1)
(if (string= string "")
()
(end-of-line)
(indent-to-column 2C-window-width)
(insert 2C-separator string))
(next-line 1) ; add one if necessary
(set-buffer b2))))
(if (< (window-width) (frame-width))
(enlarge-window 99999 t)))
;;;;; utility functions ;;;;;
(defun 2C-associated-buffer ()
"Switch to associated buffer."
(interactive)
(let ((line (+ (count-lines (point-min) (point))
(if (bolp) 1 0)))
(col (if (eolp) (if (bolp) 0) (current-column))))
(if (get-buffer-window (2C-other t))
(select-window (get-buffer-window (2C-other)))
(switch-to-buffer (2C-other)))
(newline (goto-line line))
(if col
(move-to-column col)
(end-of-line 1))))
(defun 2C-newline (arg)
"Insert ARG newlines in both buffers."
(interactive "P")
(save-window-excursion
(2C-associated-buffer)
(newline arg))
(newline arg))
(defun 2C-toggle-autoscroll (arg)
"Toggle autoscrolling, or set it iff prefix ARG is non-nil and positive.
When autoscrolling is turned on, this also realigns the two buffers."
(interactive "P")
;(sit-for 0)
(setq 2C-autoscroll-start (window-start))
(if (setq 2C-autoscroll (if arg
(>= (prefix-numeric-value arg) 0)
(not 2C-autoscroll)))
(select-window
(prog1 (selected-window)
(message "Autoscrolling is on.")
(setq arg (count-lines (point-min) (window-start)))
(if (get-buffer-window (2C-other t))
(progn
(select-window (get-buffer-window (2C-other)))
(setq arg (- arg (count-lines (point-min) (window-start))))
;; make sure that other buffer has enough lines
(save-excursion
(insert-char ?\n
(- arg (count-lines (window-start)
(goto-char (point-max)))
-1)))
(scroll-up arg)))))
(message "Autoscrolling is off.")))
(defun 2C-autoscroll ()
(if 2C-autoscroll
;; catch a mouse scroll on non-selected scrollbar
(select-window
(prog1 (selected-window)
(and (consp last-command-char)
(not (eq (selected-window)
(car (car (cdr last-command-char)))))
(select-window (car (car (cdr last-command-char)))))
;; In some cases scrolling causes an error, but post-command-hook
;; shouldn't, and should always stay in the original window
(condition-case ()
(and (or 2C-autoscroll-start (2C-toggle-autoscroll t) nil)
(/= (window-start) 2C-autoscroll-start)
(2C-other)
(get-buffer-window (2C-other))
(let ((lines (count-lines (window-start)
2C-autoscroll-start)))
(if (< (window-start) 2C-autoscroll-start)
(setq lines (- lines)))
(setq 2C-autoscroll-start (window-start))
(select-window (get-buffer-window (2C-other)))
;; make sure that other buffer has enough lines
(save-excursion
(insert-char
?\n (- lines (count-lines (window-start)
(goto-char (point-max)))
-1)))
(scroll-up lines)
(setq 2C-autoscroll-start (window-start))))
(error))))))
(defun 2C-enlarge-window-horizontally (arg)
"Make current window ARG columns wider."
(interactive "p")
(enlarge-window arg t)
(and (2C-other)
(setq 2C-window-width (+ 2C-window-width arg))
(set-buffer (2C-other))
(setq 2C-window-width (- 2C-window-width arg))))
(defun 2C-shrink-window-horizontally (arg)
"Make current window ARG columns narrower."
(interactive "p")
(2C-enlarge-window-horizontally (- arg)))
(provide 'two-column)
;;; two-column.el ends here
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