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1a06eabd ER |
1 | ;;; indent.el --- indentation commands for Emacs |
2 | ||
483e630e RM |
3 | ;; Copyright (C) 1985 Free Software Foundation, Inc. |
4 | ||
9750e079 ER |
5 | ;; Maintainer: FSF |
6 | ||
483e630e RM |
7 | ;; This file is part of GNU Emacs. |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 11 | ;; the Free Software Foundation; either version 2, or (at your option) |
483e630e RM |
12 | ;; any later version. |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
21 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
e41b2db1 ER |
23 | ;;; Commentary: |
24 | ||
25 | ;; Commands for making and changing indentation in text. These are | |
26 | ;; described in the Emacs manual. | |
27 | ||
e5167999 | 28 | ;;; Code: |
483e630e | 29 | |
106b6d0e RS |
30 | (defvar standard-indent 4 "\ |
31 | Default number of columns for margin-changing functions to indent.") | |
32 | ||
6503cec3 | 33 | (defvar indent-line-function 'indent-to-left-margin "\ |
7cf2444d | 34 | Function to indent current line.") |
483e630e RM |
35 | |
36 | (defun indent-according-to-mode () | |
37 | "Indent line in proper way for current major mode." | |
38 | (interactive) | |
39 | (funcall indent-line-function)) | |
40 | ||
41 | (defun indent-for-tab-command () | |
42 | "Indent line in proper way for current major mode." | |
43 | (interactive) | |
44 | (if (eq indent-line-function 'indent-to-left-margin) | |
45 | (insert-tab) | |
46 | (funcall indent-line-function))) | |
47 | ||
48 | (defun insert-tab () | |
49 | (if abbrev-mode | |
50 | (expand-abbrev)) | |
51 | (if indent-tabs-mode | |
52 | (insert ?\t) | |
53 | (indent-to (* tab-width (1+ (/ (current-column) tab-width)))))) | |
54 | ||
55 | (defun indent-rigidly (start end arg) | |
56 | "Indent all lines starting in the region sideways by ARG columns. | |
57 | Called from a program, takes three arguments, START, END and ARG." | |
58 | (interactive "r\np") | |
59 | (save-excursion | |
60 | (goto-char end) | |
61 | (setq end (point-marker)) | |
62 | (goto-char start) | |
63 | (or (bolp) (forward-line 1)) | |
64 | (while (< (point) end) | |
c1194ae8 RS |
65 | (let ((indent (current-indentation)) |
66 | eol-flag) | |
67 | (save-excursion | |
68 | (skip-chars-forward " \t") | |
69 | (setq eol-flag (eolp))) | |
70 | (or eol-flag | |
71 | (indent-to (max 0 (+ indent arg)) 0)) | |
72 | (delete-region (point) (progn (skip-chars-forward " \t") (point)))) | |
483e630e RM |
73 | (forward-line 1)) |
74 | (move-marker end nil))) | |
75 | ||
106b6d0e RS |
76 | (defun indent-line-to (column) |
77 | "Indent current line to COLUMN. | |
78 | This function removes or adds spaces and tabs at beginning of line | |
79 | only if necessary. It leaves point at end of indentation." | |
ca2a3cb7 BG |
80 | (back-to-indentation) |
81 | (let ((cur-col (current-column))) | |
82 | (cond ((< cur-col column) | |
83 | (indent-to column)) | |
84 | ((> cur-col column) ; too far right (after tab?) | |
34c3f2b8 | 85 | (delete-region (progn (move-to-column column t) (point)) |
ca2a3cb7 | 86 | (progn (back-to-indentation) (point))))))) |
106b6d0e RS |
87 | |
88 | (defun current-left-margin () | |
89 | "Return the left margin to use for this line. | |
90 | This is the value of the buffer-local variable `left-margin' plus the value | |
91 | of the `left-margin' text-property at the start of the line." | |
92 | (save-excursion | |
93 | (back-to-indentation) | |
94 | (max 0 | |
34c3f2b8 BG |
95 | (+ left-margin (or (get-text-property |
96 | (if (and (eobp) (not (bobp))) | |
97 | (1- (point)) (point)) | |
98 | 'left-margin) 0))))) | |
106b6d0e | 99 | |
34c3f2b8 | 100 | (defun move-to-left-margin (&optional n force) |
106b6d0e RS |
101 | "Move to the left margin of the current line. |
102 | With optional argument, move forward N-1 lines first. | |
34c3f2b8 BG |
103 | The column moved to is the one given by the `current-left-margin' function. |
104 | If the line's indentation appears to be wrong, and this command is called | |
105 | interactively or with optional argument FORCE, it will be fixed." | |
106 | (interactive (list (prefix-numeric-value current-prefix-arg) t)) | |
106b6d0e | 107 | (beginning-of-line n) |
34c3f2b8 BG |
108 | (let ((lm (current-left-margin))) |
109 | (if (memq (current-justification) '(right center)) | |
110 | (move-to-column lm) | |
111 | (skip-chars-forward " \t")) | |
112 | (let ((cc (current-column))) | |
113 | (cond ((> cc lm) | |
114 | (if (> (move-to-column lm force) lm) | |
115 | ;; If lm is in a tab and we are not forcing, move before tab | |
116 | (backward-char 1))) | |
117 | ((and force (< cc lm)) | |
118 | (indent-to-left-margin)))))) | |
106b6d0e | 119 | |
483e630e RM |
120 | ;; This is the default indent-line-function, |
121 | ;; used in Fundamental Mode, Text Mode, etc. | |
122 | (defun indent-to-left-margin () | |
34c3f2b8 | 123 | "Indent current line to the column given by `current-left-margin'." |
106b6d0e RS |
124 | (indent-line-to (current-left-margin))) |
125 | ||
34c3f2b8 BG |
126 | (defun delete-to-left-margin (&optional from to) |
127 | "Remove left margin indentation from a region. | |
128 | This deletes to the column given by `current-left-margin'. | |
129 | In no case will it delete non-whitespace. | |
130 | Args FROM and TO are optional; default is the whole buffer." | |
106b6d0e | 131 | (save-excursion |
34c3f2b8 | 132 | (goto-char (or to (point-max))) |
106b6d0e | 133 | (setq to (point-marker)) |
34c3f2b8 | 134 | (goto-char (or from (point-min))) |
106b6d0e RS |
135 | (or (bolp) (forward-line 1)) |
136 | (while (< (point) to) | |
34c3f2b8 | 137 | (delete-region (point) (progn (move-to-left-margin nil t) (point))) |
106b6d0e RS |
138 | (forward-line 1)) |
139 | (move-marker to nil))) | |
140 | ||
141 | (defun set-left-margin (from to lm) | |
142 | "Set the left margin of the region to WIDTH. | |
143 | If `auto-fill-mode' is active, re-fill the region to fit the new margin." | |
144 | (interactive "r\nNSet left margin to column: ") | |
145 | (if (interactive-p) (setq lm (prefix-numeric-value lm))) | |
146 | (save-excursion | |
147 | ;; If inside indentation, start from BOL. | |
148 | (goto-char from) | |
149 | (skip-chars-backward " \t") | |
150 | (if (bolp) (setq from (point))) | |
34c3f2b8 | 151 | ;; Place end after whitespace |
106b6d0e | 152 | (goto-char to) |
34c3f2b8 | 153 | (skip-chars-forward " \t") |
106b6d0e | 154 | (setq to (point-marker))) |
34c3f2b8 BG |
155 | ;; Delete margin indentation first, but keep paragraph indentation. |
156 | (delete-to-left-margin from to) | |
106b6d0e | 157 | (put-text-property from to 'left-margin lm) |
34c3f2b8 BG |
158 | (indent-rigidly from to lm) |
159 | (if auto-fill-function (save-excursion (fill-region from to nil t t))) | |
106b6d0e RS |
160 | (move-marker to nil)) |
161 | ||
162 | (defun set-right-margin (from to lm) | |
163 | "Set the right margin of the region to WIDTH. | |
164 | If `auto-fill-mode' is active, re-fill the region to fit the new margin." | |
165 | (interactive "r\nNSet left margin to column: ") | |
166 | (if (interactive-p) (setq lm (prefix-numeric-value lm))) | |
167 | (save-excursion | |
168 | (goto-char from) | |
169 | (skip-chars-backward " \t") | |
170 | (if (bolp) (setq from (point)))) | |
171 | (put-text-property from to 'right-margin lm) | |
34c3f2b8 | 172 | (if auto-fill-function (save-excursion (fill-region from to nil t t)))) |
106b6d0e RS |
173 | |
174 | (defun alter-text-property (from to prop func &optional object) | |
175 | "Programmatically change value of a text-property. | |
176 | For each region between FROM and TO that has a single value for PROPERTY, | |
177 | apply FUNCTION to that value and sets the property to the function's result. | |
178 | Optional fifth argument OBJECT specifies the string or buffer to operate on." | |
179 | (let ((begin from) | |
180 | end val) | |
181 | (while (setq val (get-text-property begin prop object) | |
182 | end (text-property-not-all begin to prop val object)) | |
183 | (put-text-property begin end prop (funcall func val) object) | |
184 | (setq begin end)) | |
185 | (if (< begin to) | |
186 | (put-text-property begin to prop (funcall func val) object)))) | |
187 | ||
188 | (defun increase-left-margin (from to inc) | |
189 | "Increase or decrease the left-margin of the region. | |
190 | With no prefix argument, this adds `standard-indent' of indentation. | |
191 | A prefix arg (optional third arg INC noninteractively) specifies the amount | |
192 | to change the margin by, in characters. | |
193 | If `auto-fill-mode' is active, re-fill the region to fit the new margin." | |
194 | (interactive "*r\nP") | |
195 | (setq inc (if inc (prefix-numeric-value inc) standard-indent)) | |
196 | (save-excursion | |
197 | (goto-char from) | |
198 | (skip-chars-backward " \t") | |
199 | (if (bolp) (setq from (point))) | |
200 | (goto-char to) | |
201 | (setq to (point-marker))) | |
106b6d0e | 202 | (alter-text-property from to 'left-margin |
34c3f2b8 BG |
203 | (lambda (v) (max (- left-margin) (+ inc (or v 0))))) |
204 | (indent-rigidly from to inc) | |
205 | (if auto-fill-function (save-excursion (fill-region from to nil t t))) | |
106b6d0e RS |
206 | (move-marker to nil)) |
207 | ||
208 | (defun decrease-left-margin (from to inc) | |
209 | "Make the left margin of the region smaller. | |
210 | With no prefix argument, decrease the indentation by `standard-indent'. | |
211 | A prefix arg (optional third arg INC noninteractively) specifies the amount | |
212 | to change the margin by, in characters. | |
213 | If `auto-fill-mode' is active, re-fill the region to fit the new margin." | |
214 | (interactive "*r\nP") | |
215 | (setq inc (if inc (prefix-numeric-value inc) standard-indent)) | |
216 | (increase-left-margin from to (- inc))) | |
217 | ||
218 | (defun increase-right-margin (from to inc) | |
219 | "Increase the right-margin of the region. | |
220 | With no prefix argument, increase the right margin by `standard-indent'. | |
221 | A prefix arg (optional third arg INC noninteractively) specifies the amount | |
222 | to change the margin by, in characters. A negative argument decreases | |
223 | the right margin width. | |
224 | If `auto-fill-mode' is active, re-fill the region to fit the new margin." | |
225 | (interactive "r\nP") | |
226 | (if (interactive-p) | |
227 | (setq inc (if inc (prefix-numeric-value current-prefix-arg) | |
228 | standard-indent))) | |
229 | (save-excursion | |
230 | (alter-text-property from to 'right-margin | |
34c3f2b8 | 231 | (lambda (v) (+ inc (or v 0)))) |
106b6d0e RS |
232 | (if auto-fill-function |
233 | (fill-region from to nil t t)))) | |
234 | ||
235 | (defun decrease-right-margin (from to inc) | |
236 | "Make the right margin of the region smaller. | |
237 | With no prefix argument, decrease the right margin by `standard-indent'. | |
238 | A prefix arg (optional third arg INC noninteractively) specifies the amount | |
239 | of width to remove, in characters. A negative argument increases | |
240 | the right margin width. | |
241 | If `auto-fill-mode' is active, re-fills region to fit in new margin." | |
242 | (interactive "*r\nP") | |
243 | (setq inc (if inc (prefix-numeric-value inc) standard-indent)) | |
244 | (increase-right-margin from to (- inc))) | |
483e630e | 245 | |
34c3f2b8 BG |
246 | (defun beginning-of-line-text (&optional n) |
247 | "Move to the beginning of the text on this line. | |
248 | With optional argument, move forward N-1 lines first. | |
249 | From the beginning of the line, moves past the left-margin indentation, the | |
250 | fill-prefix, and any indentation used for centering or right-justifying the | |
251 | line, but does not move past any whitespace that was explicitly inserted | |
252 | \(such as a tab used to indent the first line of a paragraph)." | |
253 | (interactive "p") | |
254 | (beginning-of-line n) | |
255 | (skip-chars-forward " \t") | |
256 | ;; Skip over fill-prefix. | |
257 | (if (and fill-prefix | |
258 | (not (string-equal fill-prefix ""))) | |
259 | (if (equal fill-prefix | |
260 | (buffer-substring | |
261 | (point) (min (point-max) (+ (length fill-prefix) (point))))) | |
262 | (forward-char (length fill-prefix))) | |
263 | (if (and adaptive-fill-mode | |
264 | (looking-at adaptive-fill-regexp)) | |
265 | (goto-char (match-end 0)))) | |
266 | ;; Skip centering or flushright indentation | |
267 | (if (memq (current-justification) '(center right)) | |
268 | (skip-chars-forward " \t"))) | |
269 | ||
483e630e | 270 | (defvar indent-region-function nil |
797d8537 JB |
271 | "Function which is short cut to indent region using indent-according-to-mode. |
272 | A value of nil means really run indent-according-to-mode on each line.") | |
483e630e | 273 | |
88a2603a | 274 | (defun indent-region (start end column) |
483e630e | 275 | "Indent each nonblank line in the region. |
88a2603a RS |
276 | With no argument, indent each line using `indent-according-to-mode', |
277 | or use `indent-region-function' to do the whole region if that's non-nil. | |
278 | If there is a fill prefix, make each line start with the fill prefix. | |
483e630e RM |
279 | With argument COLUMN, indent each line to that column. |
280 | Called from a program, takes three args: START, END and COLUMN." | |
281 | (interactive "r\nP") | |
88a2603a | 282 | (if (null column) |
483e630e RM |
283 | (if fill-prefix |
284 | (save-excursion | |
285 | (goto-char end) | |
286 | (setq end (point-marker)) | |
287 | (goto-char start) | |
288 | (let ((regexp (regexp-quote fill-prefix))) | |
88a2603a RS |
289 | (while (< (point) end) |
290 | (or (looking-at regexp) | |
291 | (and (bolp) (eolp)) | |
292 | (insert fill-prefix)) | |
293 | (forward-line 1)))) | |
483e630e RM |
294 | (if indent-region-function |
295 | (funcall indent-region-function start end) | |
296 | (save-excursion | |
88a2603a RS |
297 | (goto-char end) |
298 | (setq end (point-marker)) | |
299 | (goto-char start) | |
300 | (or (bolp) (forward-line 1)) | |
301 | (while (< (point) end) | |
232acca7 | 302 | (or (and (bolp) (eolp)) |
88a2603a RS |
303 | (funcall indent-line-function)) |
304 | (forward-line 1)) | |
305 | (move-marker end nil)))) | |
306 | (setq column (prefix-numeric-value column)) | |
483e630e RM |
307 | (save-excursion |
308 | (goto-char end) | |
309 | (setq end (point-marker)) | |
310 | (goto-char start) | |
311 | (or (bolp) (forward-line 1)) | |
312 | (while (< (point) end) | |
313 | (delete-region (point) (progn (skip-chars-forward " \t") (point))) | |
314 | (or (eolp) | |
106b6d0e | 315 | (indent-to column 0)) |
483e630e RM |
316 | (forward-line 1)) |
317 | (move-marker end nil)))) | |
318 | ||
319 | (defun indent-relative-maybe () | |
320 | "Indent a new line like previous nonblank line." | |
321 | (interactive) | |
322 | (indent-relative t)) | |
323 | ||
324 | (defun indent-relative (&optional unindented-ok) | |
325 | "Space out to under next indent point in previous nonblank line. | |
326 | An indent point is a non-whitespace character following whitespace. | |
327 | If the previous nonblank line has no indent points beyond the | |
328 | column point starts at, `tab-to-tab-stop' is done instead." | |
329 | (interactive "P") | |
330 | (if abbrev-mode (expand-abbrev)) | |
331 | (let ((start-column (current-column)) | |
332 | indent) | |
333 | (save-excursion | |
334 | (beginning-of-line) | |
335 | (if (re-search-backward "^[^\n]" nil t) | |
336 | (let ((end (save-excursion (forward-line 1) (point)))) | |
337 | (move-to-column start-column) | |
338 | ;; Is start-column inside a tab on this line? | |
339 | (if (> (current-column) start-column) | |
340 | (backward-char 1)) | |
341 | (or (looking-at "[ \t]") | |
342 | unindented-ok | |
343 | (skip-chars-forward "^ \t" end)) | |
344 | (skip-chars-forward " \t" end) | |
345 | (or (= (point) end) (setq indent (current-column)))))) | |
346 | (if indent | |
347 | (let ((opoint (point-marker))) | |
348 | (delete-region (point) (progn (skip-chars-backward " \t") (point))) | |
349 | (indent-to indent 0) | |
350 | (if (> opoint (point)) | |
351 | (goto-char opoint)) | |
352 | (move-marker opoint nil)) | |
353 | (tab-to-tab-stop)))) | |
354 | ||
355 | (defvar tab-stop-list | |
356 | '(8 16 24 32 40 48 56 64 72 80 88 96 104 112 120) | |
7ad68ead RS |
357 | "*List of tab stop positions used by `tab-to-tab-stops'. |
358 | This should be a list of integers, ordered from smallest to largest.") | |
483e630e RM |
359 | |
360 | (defvar edit-tab-stops-map nil "Keymap used in `edit-tab-stops'.") | |
361 | (if edit-tab-stops-map | |
362 | nil | |
363 | (setq edit-tab-stops-map (make-sparse-keymap)) | |
364 | (define-key edit-tab-stops-map "\C-x\C-s" 'edit-tab-stops-note-changes) | |
365 | (define-key edit-tab-stops-map "\C-c\C-c" 'edit-tab-stops-note-changes)) | |
366 | ||
367 | (defvar edit-tab-stops-buffer nil | |
368 | "Buffer whose tab stops are being edited--in case | |
369 | the variable `tab-stop-list' is local in that buffer.") | |
370 | ||
371 | (defun edit-tab-stops () | |
372 | "Edit the tab stops used by `tab-to-tab-stop'. | |
373 | Creates a buffer *Tab Stops* containing text describing the tab stops. | |
374 | A colon indicates a column where there is a tab stop. | |
375 | You can add or remove colons and then do \\<edit-tab-stops-map>\\[edit-tab-stops-note-changes] to make changes take effect." | |
376 | (interactive) | |
377 | (setq edit-tab-stops-buffer (current-buffer)) | |
378 | (switch-to-buffer (get-buffer-create "*Tab Stops*")) | |
379 | (use-local-map edit-tab-stops-map) | |
380 | (make-local-variable 'indent-tabs-mode) | |
381 | (setq indent-tabs-mode nil) | |
382 | (overwrite-mode 1) | |
383 | (setq truncate-lines t) | |
384 | (erase-buffer) | |
385 | (let ((tabs tab-stop-list)) | |
386 | (while tabs | |
387 | (indent-to (car tabs) 0) | |
388 | (insert ?:) | |
389 | (setq tabs (cdr tabs)))) | |
390 | (let ((count 0)) | |
391 | (insert ?\n) | |
392 | (while (< count 8) | |
393 | (insert (+ count ?0)) | |
394 | (insert " ") | |
395 | (setq count (1+ count))) | |
396 | (insert ?\n) | |
397 | (while (> count 0) | |
398 | (insert "0123456789") | |
399 | (setq count (1- count)))) | |
400 | (insert "\nTo install changes, type C-c C-c") | |
401 | (goto-char (point-min))) | |
402 | ||
403 | (defun edit-tab-stops-note-changes () | |
404 | "Put edited tab stops into effect." | |
405 | (interactive) | |
406 | (let (tabs) | |
407 | (save-excursion | |
408 | (goto-char 1) | |
409 | (end-of-line) | |
410 | (while (search-backward ":" nil t) | |
411 | (setq tabs (cons (current-column) tabs)))) | |
412 | (bury-buffer (prog1 (current-buffer) | |
413 | (switch-to-buffer edit-tab-stops-buffer))) | |
414 | (setq tab-stop-list tabs)) | |
415 | (message "Tab stops installed")) | |
416 | ||
417 | (defun tab-to-tab-stop () | |
418 | "Insert spaces or tabs to next defined tab-stop column. | |
419 | The variable `tab-stop-list' is a list of columns at which there are tab stops. | |
420 | Use \\[edit-tab-stops] to edit them interactively." | |
421 | (interactive) | |
422 | (if abbrev-mode (expand-abbrev)) | |
423 | (let ((tabs tab-stop-list)) | |
424 | (while (and tabs (>= (current-column) (car tabs))) | |
425 | (setq tabs (cdr tabs))) | |
426 | (if tabs | |
9d840bec RS |
427 | (let ((opoint (point))) |
428 | (skip-chars-backward " \t") | |
429 | (delete-region (point) opoint) | |
430 | (indent-to (car tabs))) | |
483e630e RM |
431 | (insert ?\ )))) |
432 | ||
433 | (defun move-to-tab-stop () | |
434 | "Move point to next defined tab-stop column. | |
fbf8f564 RS |
435 | The variable `tab-stop-list' is a list of columns at which there are tab stops. |
436 | Use \\[edit-tab-stops] to edit them interactively." | |
437 | (interactive) | |
438 | (let ((tabs tab-stop-list)) | |
439 | (while (and tabs (>= (current-column) (car tabs))) | |
440 | (setq tabs (cdr tabs))) | |
441 | (if tabs | |
442 | (let ((before (point))) | |
443 | (move-to-column (car tabs) t) | |
444 | (save-excursion | |
445 | (goto-char before) | |
446 | ;; If we just added a tab, or moved over one, | |
447 | ;; delete any superfluous spaces before the old point. | |
448 | (if (and (eq (preceding-char) ?\ ) | |
449 | (eq (following-char) ?\t)) | |
450 | (let ((tabend (* (/ (current-column) tab-width) tab-width))) | |
451 | (while (and (> (current-column) tabend) | |
452 | (eq (preceding-char) ?\ )) | |
453 | (forward-char -1)) | |
454 | (delete-region (point) before)))))))) | |
455 | ||
483e630e RM |
456 | (define-key global-map "\t" 'indent-for-tab-command) |
457 | (define-key esc-map "\034" 'indent-region) | |
458 | (define-key ctl-x-map "\t" 'indent-rigidly) | |
459 | (define-key esc-map "i" 'tab-to-tab-stop) | |
1a06eabd ER |
460 | |
461 | ;;; indent.el ends here |