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1 ;;; indent.el --- indentation commands for XEmacs
2
3 ;; Copyright (C) 1985, 1992, 1993, 1995, 1997 Free Software Foundation, Inc.
4
5 ;; Maintainer: FSF
6 ;; Keywords: lisp, languages, tools, dumped
7
8 ;; This file is part of XEmacs.
9
10 ;; XEmacs is free software; you can redistribute it and/or modify it
11 ;; under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; any later version.
14
15 ;; XEmacs is distributed in the hope that it will be useful, but
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ;; General Public License for more details.
19
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
23 ;; 02111-1307, USA.
24
25 ;;; Synched up with: FSF 19.30.
26
27 ;;; Commentary:
28
29 ;; This file is dumped with XEmacs.
30
31 ;; Commands for making and changing indentation in text. These are
32 ;; described in the XEmacs Reference Manual.
33
34 ;; 06/11/1997 - Convert (preceding|following)-char to char-(before|after) -slb
35
36 ;;; Code:
37
38 (defvar standard-indent 4 "\
39 Default number of columns for margin-changing functions to indent.")
40
41 (defvar indent-line-function 'indent-to-left-margin
42 "Function to indent current line.")
43
44 (defun indent-according-to-mode ()
45 "Indent line in proper way for current major mode."
46 (interactive)
47 (funcall indent-line-function))
48
49 (defun indent-for-tab-command (&optional prefix-arg)
50 "Indent line in proper way for current major mode."
51 (interactive "P")
52 (if (eq indent-line-function 'indent-to-left-margin)
53 (insert-tab prefix-arg)
54 (if prefix-arg
55 (funcall indent-line-function prefix-arg)
56 (funcall indent-line-function))))
57
58 (defun insert-tab (&optional prefix-arg)
59 (let ((count (prefix-numeric-value prefix-arg)))
60 (if abbrev-mode
61 (expand-abbrev))
62 (if indent-tabs-mode
63 (insert-char ?\t count)
64 ;; XEmacs: (Need the `1+')
65 (indent-to (* tab-width (1+ (/ (current-column) tab-width)))))))
66
67 (defun indent-rigidly (start end arg)
68 "Indent all lines starting in the region sideways by ARG columns.
69 Called from a program, takes three arguments, START, END and ARG."
70 (interactive "r\np")
71 (save-excursion
72 (goto-char end)
73 (setq end (point-marker))
74 (goto-char start)
75 (or (bolp) (forward-line 1))
76 (while (< (point) end)
77 (let ((indent (current-indentation))
78 eol-flag)
79 (save-excursion
80 (skip-chars-forward " \t")
81 (setq eol-flag (eolp)))
82 (or eol-flag
83 (indent-to (max 0 (+ indent arg)) 0))
84 (delete-region (point) (progn (skip-chars-forward " \t") (point))))
85 (forward-line 1))
86 (move-marker end nil)
87 (setq zmacs-region-stays nil))) ; XEmacs
88
89 (defun indent-line-to (column)
90 "Indent current line to COLUMN.
91 This function removes or adds spaces and tabs at beginning of line
92 only if necessary. It leaves point at end of indentation."
93 (back-to-indentation)
94 (let ((cur-col (current-column)))
95 (cond ((< cur-col column)
96 (if (> (- column (* (/ cur-col tab-width) tab-width)) tab-width)
97 (delete-region (point)
98 (progn (skip-chars-backward " ") (point))))
99 (indent-to column))
100 ((> cur-col column) ; too far right (after tab?)
101 (delete-region (progn (move-to-column column t) (point))
102 (progn (back-to-indentation) (point)))))))
103
104 (defun current-left-margin ()
105 "Return the left margin to use for this line.
106 This is the value of the buffer-local variable `left-margin' plus the value
107 of the `left-margin' text-property at the start of the line."
108 (save-excursion
109 (back-to-indentation)
110 (max 0
111 (+ left-margin (or (get-text-property
112 (if (and (eobp) (not (bobp)))
113 (1- (point)) (point))
114 'left-margin) 0)))))
115
116 (defun move-to-left-margin (&optional n force)
117 "Move to the left margin of the current line.
118 With optional argument, move forward N-1 lines first.
119 The column moved to is the one given by the `current-left-margin' function.
120 If the line's indentation appears to be wrong, and this command is called
121 interactively or with optional argument FORCE, it will be fixed."
122 (interactive (list (prefix-numeric-value current-prefix-arg) t))
123 (beginning-of-line n)
124 (skip-chars-forward " \t")
125 (let ((lm (current-left-margin))
126 (cc (current-column)))
127 (cond ((> cc lm)
128 (if (> (move-to-column lm force) lm)
129 ;; If lm is in a tab and we are not forcing, move before tab
130 (backward-char 1)))
131 ((and force (< cc lm))
132 (indent-to-left-margin)))))
133
134 ;; This is the default indent-line-function,
135 ;; used in Fundamental Mode, Text Mode, etc.
136 (defun indent-to-left-margin ()
137 "Indent current line to the column given by `current-left-margin'."
138 (indent-line-to (current-left-margin)))
139
140 (defun delete-to-left-margin (&optional from to)
141 "Remove left margin indentation from a region.
142 This deletes to the column given by `current-left-margin'.
143 In no case will it delete non-whitespace.
144 Args FROM and TO are optional; default is the whole buffer."
145 (save-excursion
146 (goto-char (or to (point-max)))
147 (setq to (point-marker))
148 (goto-char (or from (point-min)))
149 (or (bolp) (forward-line 1))
150 (while (< (point) to)
151 (delete-region (point) (progn (move-to-left-margin nil t) (point)))
152 (forward-line 1))
153 (move-marker to nil)))
154
155 (defun set-left-margin (from to lm)
156 "Set the left margin of the region to WIDTH.
157 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
158 (interactive "r\nNSet left margin to column: ")
159 (if (interactive-p) (setq lm (prefix-numeric-value lm)))
160 (save-excursion
161 ;; If inside indentation, start from BOL.
162 (goto-char from)
163 (skip-chars-backward " \t")
164 (if (bolp) (setq from (point)))
165 ;; Place end after whitespace
166 (goto-char to)
167 (skip-chars-forward " \t")
168 (setq to (point-marker)))
169 ;; Delete margin indentation first, but keep paragraph indentation.
170 (delete-to-left-margin from to)
171 (put-text-property from to 'left-margin lm)
172 (indent-rigidly from to lm)
173 (if auto-fill-function (save-excursion (fill-region from to nil t t)))
174 (move-marker to nil))
175
176 (defun set-right-margin (from to lm)
177 "Set the right margin of the region to WIDTH.
178 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
179 (interactive "r\nNSet right margin to width: ")
180 (if (interactive-p) (setq lm (prefix-numeric-value lm)))
181 (save-excursion
182 (goto-char from)
183 (skip-chars-backward " \t")
184 (if (bolp) (setq from (point))))
185 (put-text-property from to 'right-margin lm)
186 (if auto-fill-function (save-excursion (fill-region from to nil t t))))
187
188 (defun alter-text-property (from to prop func &optional object)
189 "Programmatically change value of a text-property.
190 For each region between FROM and TO that has a single value for PROPERTY,
191 apply FUNCTION to that value and sets the property to the function's result.
192 Optional fifth argument OBJECT specifies the string or buffer to operate on."
193 (let ((begin from)
194 end val)
195 (while (setq val (get-text-property begin prop object)
196 end (text-property-not-all begin to prop val object))
197 (put-text-property begin end prop (funcall func val) object)
198 (setq begin end))
199 (if (< begin to)
200 (put-text-property begin to prop (funcall func val) object))))
201
202 (defun increase-left-margin (from to inc)
203 "Increase or decrease the left-margin of the region.
204 With no prefix argument, this adds `standard-indent' of indentation.
205 A prefix arg (optional third arg INC noninteractively) specifies the amount
206 to change the margin by, in characters.
207 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
208 (interactive "*r\nP")
209 (setq inc (if inc (prefix-numeric-value inc) standard-indent))
210 (save-excursion
211 (goto-char from)
212 (skip-chars-backward " \t")
213 (if (bolp) (setq from (point)))
214 (goto-char to)
215 (setq to (point-marker)))
216 (alter-text-property from (marker-position to) 'left-margin ; XEmacs
217 (lambda (v) (max (- left-margin) (+ inc (or v 0)))))
218 (indent-rigidly from (marker-position to) inc) ; XEmacs
219 (if auto-fill-function
220 (save-excursion
221 (fill-region from (marker-position to) nil t t))) ; XEmacs
222 (move-marker to nil))
223
224 (defun decrease-left-margin (from to inc)
225 "Make the left margin of the region smaller.
226 With no prefix argument, decrease the indentation by `standard-indent'.
227 A prefix arg (optional third arg INC noninteractively) specifies the amount
228 to change the margin by, in characters.
229 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
230 (interactive "*r\nP")
231 (setq inc (if inc (prefix-numeric-value inc) standard-indent))
232 (increase-left-margin from to (- inc)))
233
234 (defun increase-right-margin (from to inc)
235 "Increase the right-margin of the region.
236 With no prefix argument, increase the right margin by `standard-indent'.
237 A prefix arg (optional third arg INC noninteractively) specifies the amount
238 to change the margin by, in characters. A negative argument decreases
239 the right margin width.
240 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
241 (interactive "r\nP")
242 (if (interactive-p)
243 (setq inc (if inc (prefix-numeric-value current-prefix-arg)
244 standard-indent)))
245 (save-excursion
246 (alter-text-property from to 'right-margin
247 (lambda (v) (+ inc (or v 0))))
248 (if auto-fill-function
249 (fill-region from to nil t t))))
250
251 (defun decrease-right-margin (from to inc)
252 "Make the right margin of the region smaller.
253 With no prefix argument, decrease the right margin by `standard-indent'.
254 A prefix arg (optional third arg INC noninteractively) specifies the amount
255 of width to remove, in characters. A negative argument increases
256 the right margin width.
257 If `auto-fill-mode' is active, re-fills region to fit in new margin."
258 (interactive "*r\nP")
259 (setq inc (if inc (prefix-numeric-value inc) standard-indent))
260 (increase-right-margin from to (- inc)))
261
262 (defun beginning-of-line-text (&optional n)
263 "Move to the beginning of the text on this line.
264 With optional argument, move forward N-1 lines first.
265 From the beginning of the line, moves past the left-margin indentation, the
266 fill-prefix, and any indentation used for centering or right-justifying the
267 line, but does not move past any whitespace that was explicitly inserted
268 \(such as a tab used to indent the first line of a paragraph)."
269 (interactive "p")
270 (beginning-of-line n)
271 (skip-chars-forward " \t")
272 ;; Skip over fill-prefix.
273 (if (and fill-prefix
274 (not (string-equal fill-prefix "")))
275 (if (equal fill-prefix
276 (buffer-substring
277 (point) (min (point-max) (+ (length fill-prefix) (point)))))
278 (forward-char (length fill-prefix)))
279 (if (and adaptive-fill-mode adaptive-fill-regexp
280 (looking-at adaptive-fill-regexp))
281 (goto-char (match-end 0))))
282 ;; Skip centering or flushright indentation
283 (if (memq (current-justification) '(center right))
284 (skip-chars-forward " \t")))
285
286 (defvar indent-region-function nil
287 "Short cut function to indent region using `indent-according-to-mode'.
288 A value of nil means really run `indent-according-to-mode' on each line.")
289
290 (defun indent-region (start end column)
291 "Indent each nonblank line in the region.
292 With no argument, indent each line using `indent-according-to-mode',
293 or use `indent-region-function' to do the whole region if that's non-nil.
294 If there is a fill prefix, make each line start with the fill prefix.
295 With argument COLUMN, indent each line to that column.
296 Called from a program, takes three args: START, END and COLUMN."
297 (interactive "r\nP")
298 (if (null column)
299 (if fill-prefix
300 (save-excursion
301 (goto-char end)
302 (setq end (point-marker))
303 (goto-char start)
304 (let ((regexp (regexp-quote fill-prefix)))
305 (while (< (point) end)
306 (or (looking-at regexp)
307 (and (bolp) (eolp))
308 (insert fill-prefix))
309 (forward-line 1))))
310 (if indent-region-function
311 (funcall indent-region-function start end)
312 (save-excursion
313 (goto-char end)
314 (setq end (point-marker))
315 (goto-char start)
316 (or (bolp) (forward-line 1))
317 (while (< (point) end)
318 (or (and (bolp) (eolp))
319 (funcall indent-line-function))
320 (forward-line 1))
321 (move-marker end nil))))
322 (setq column (prefix-numeric-value column))
323 (save-excursion
324 (goto-char end)
325 (setq end (point-marker))
326 (goto-char start)
327 (or (bolp) (forward-line 1))
328 (while (< (point) end)
329 (delete-region (point) (progn (skip-chars-forward " \t") (point)))
330 (or (eolp)
331 (indent-to column 0))
332 (forward-line 1))
333 (move-marker end nil))))
334
335 (defun indent-relative-maybe ()
336 "Indent a new line like previous nonblank line."
337 (interactive)
338 (indent-relative t))
339
340 (defun indent-relative (&optional unindented-ok)
341 "Space out to under next indent point in previous nonblank line.
342 An indent point is a non-whitespace character following whitespace.
343 If the previous nonblank line has no indent points beyond the
344 column point starts at, `tab-to-tab-stop' is done instead."
345 (interactive "P")
346 (if abbrev-mode (expand-abbrev))
347 (let ((start-column (current-column))
348 indent)
349 (save-excursion
350 (beginning-of-line)
351 (if (re-search-backward "^[^\n]" nil t)
352 (let ((end (save-excursion (forward-line 1) (point))))
353 (move-to-column start-column)
354 ;; Is start-column inside a tab on this line?
355 (if (> (current-column) start-column)
356 (backward-char 1))
357 (or (looking-at "[ \t]")
358 unindented-ok
359 (skip-chars-forward "^ \t" end))
360 (skip-chars-forward " \t" end)
361 (or (= (point) end) (setq indent (current-column))))))
362 (if indent
363 (let ((opoint (point-marker)))
364 (delete-region (point) (progn (skip-chars-backward " \t") (point)))
365 (indent-to indent 0)
366 (if (> opoint (point))
367 (goto-char opoint))
368 (move-marker opoint nil))
369 (tab-to-tab-stop))))
370
371 (defvar tab-stop-list
372 '(8 16 24 32 40 48 56 64 72 80 88 96 104 112 120)
373 "*List of tab stop positions used by `tab-to-tab-stops'.
374 This should be a list of integers, ordered from smallest to largest.")
375
376 (defvar edit-tab-stops-map nil "Keymap used in `edit-tab-stops'.")
377 (if edit-tab-stops-map
378 nil
379 (setq edit-tab-stops-map (make-sparse-keymap))
380 (define-key edit-tab-stops-map "\C-x\C-s" 'edit-tab-stops-note-changes)
381 (define-key edit-tab-stops-map "\C-c\C-c" 'edit-tab-stops-note-changes))
382
383 (defvar edit-tab-stops-buffer nil
384 "Buffer whose tab stops are being edited--in case
385 the variable `tab-stop-list' is local in that buffer.")
386
387 (defun edit-tab-stops ()
388 "Edit the tab stops used by `tab-to-tab-stop'.
389 Creates a buffer *Tab Stops* containing text describing the tab stops.
390 A colon indicates a column where there is a tab stop.
391 You can add or remove colons and then do \\<edit-tab-stops-map>\\[edit-tab-stops-note-changes] to make changes take effect."
392 (interactive)
393 (setq edit-tab-stops-buffer (current-buffer))
394 (switch-to-buffer (get-buffer-create "*Tab Stops*"))
395 ;; #### I18N3 should mark buffer as output-translating
396 (use-local-map edit-tab-stops-map)
397 (make-local-variable 'indent-tabs-mode)
398 (setq indent-tabs-mode nil)
399 (overwrite-mode 1)
400 (setq truncate-lines t)
401 (erase-buffer)
402 (let ((tabs tab-stop-list))
403 (while tabs
404 (indent-to (car tabs) 0)
405 (insert ?:)
406 (setq tabs (cdr tabs))))
407 (let ((count 0))
408 (insert ?\n)
409 (while (< count 8)
410 (insert (+ count ?0))
411 (insert " ")
412 (setq count (1+ count)))
413 (insert ?\n)
414 (while (> count 0)
415 (insert "0123456789")
416 (setq count (1- count))))
417 ;; XEmacs
418 (insert (substitute-command-keys "\nTo install changes, type \\<edit-tab-stops-map>\\[edit-tab-stops-note-changes]"))
419 (goto-char (point-min)))
420
421 (defun edit-tab-stops-note-changes ()
422 "Put edited tab stops into effect."
423 (interactive)
424 (let (tabs)
425 (save-excursion
426 (goto-char 1)
427 (end-of-line)
428 (while (search-backward ":" nil t)
429 (setq tabs (cons (current-column) tabs))))
430 (bury-buffer (prog1 (current-buffer)
431 (switch-to-buffer edit-tab-stops-buffer)))
432 (setq tab-stop-list tabs))
433 (message "Tab stops installed"))
434
435 (defun tab-to-tab-stop ()
436 "Insert spaces or tabs to next defined tab-stop column.
437 The variable `tab-stop-list' is a list of columns at which there are tab stops.
438 Use \\[edit-tab-stops] to edit them interactively."
439 (interactive)
440 (and abbrev-mode (eq (char-syntax (char-before (point))) ?w)
441 (expand-abbrev))
442 (let ((tabs tab-stop-list))
443 (while (and tabs (>= (current-column) (car tabs)))
444 (setq tabs (cdr tabs)))
445 (if tabs
446 (let ((opoint (point)))
447 (skip-chars-backward " \t")
448 (delete-region (point) opoint)
449 (indent-to (car tabs)))
450 (insert ?\ ))))
451
452 (defun move-to-tab-stop ()
453 "Move point to next defined tab-stop column.
454 The variable `tab-stop-list' is a list of columns at which there are tab stops.
455 Use \\[edit-tab-stops] to edit them interactively."
456 (interactive)
457 (let ((tabs tab-stop-list))
458 (while (and tabs (>= (current-column) (car tabs)))
459 (setq tabs (cdr tabs)))
460 (if tabs
461 (let ((before (point)))
462 (move-to-column (car tabs) t)
463 (save-excursion
464 (goto-char before)
465 ;; If we just added a tab, or moved over one,
466 ;; delete any superfluous spaces before the old point.
467 (if (and (eq (char-before (point)) ?\ )
468 (eq (char-after (point)) ?\t))
469 (let ((tabend (* (/ (current-column) tab-width) tab-width)))
470 (while (and (> (current-column) tabend)
471 (eq (char-before (point)) ?\ ))
472 (forward-char -1))
473 (delete-region (point) before))))))))
474
475 ;(define-key global-map "\t" 'indent-for-tab-command)
476 ;(define-key esc-map "\034" 'indent-region)
477 ;(define-key ctl-x-map "\t" 'indent-rigidly)
478 ;(define-key esc-map "i" 'tab-to-tab-stop)
479
480 ;;; indent.el ends here