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e8af40ee | 1 | ;;; rect.el --- rectangle functions for GNU Emacs |
6594deb0 | 2 | |
35f901fa | 3 | ;; Copyright (C) 1985, 1999, 2000, 2001 Free Software Foundation, Inc. |
9750e079 | 4 | |
aa01bed1 | 5 | ;; Maintainer: Didier Verna <didier@xemacs.org> |
d7b4d18f | 6 | ;; Keywords: internal |
4821e2af | 7 | |
a2535589 JA |
8 | ;; This file is part of GNU Emacs. |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 12 | ;; the Free Software Foundation; either version 2, or (at your option) |
a2535589 JA |
13 | ;; any later version. |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
a2535589 | 24 | |
edbd2f74 ER |
25 | ;;; Commentary: |
26 | ||
e037c34c | 27 | ;; This package provides the operations on rectangles that are documented |
edbd2f74 ER |
28 | ;; in the Emacs manual. |
29 | ||
e417c66f | 30 | ;; ### NOTE: this file has been almost completely rewritten by Didier Verna |
aa01bed1 | 31 | ;; <didier@xemacs.org> in July 1999. The purpose of this rewrite is to be less |
e417c66f RS |
32 | ;; intrusive and fill lines with whitespaces only when needed. A few functions |
33 | ;; are untouched though, as noted above their definition. | |
34 | ||
35 | ||
4821e2af | 36 | ;;; Code: |
a2535589 | 37 | |
e40261d0 | 38 | ;;;###autoload |
e417c66f | 39 | (defun move-to-column-force (column &optional flag) |
92e30637 | 40 | "If COLUMN is within a multi-column character, replace it by spaces and tab. |
e417c66f RS |
41 | As for `move-to-column', passing anything but nil or t in FLAG will move to |
42 | the desired column only if the line is long enough." | |
b9e81d0a | 43 | (move-to-column column (or flag t))) |
df2801ec JB |
44 | |
45 | ;;;###autoload | |
92e30637 | 46 | (make-obsolete 'move-to-column-force 'move-to-column "21.2") |
e40261d0 | 47 | |
e417c66f | 48 | ;; not used any more --dv |
3d1b9783 RS |
49 | ;; extract-rectangle-line stores lines into this list |
50 | ;; to accumulate them for extract-rectangle and delete-extract-rectangle. | |
51 | (defvar operate-on-rectangle-lines) | |
52 | ||
74be0ade | 53 | ;; ### NOTE: this function is untouched, but not used anymore apart from |
e417c66f | 54 | ;; `delete-whitespace-rectangle'. `apply-on-rectangle' is used instead. --dv |
a2535589 JA |
55 | (defun operate-on-rectangle (function start end coerce-tabs) |
56 | "Call FUNCTION for each line of rectangle with corners at START, END. | |
57 | If COERCE-TABS is non-nil, convert multi-column characters | |
58 | that span the starting or ending columns on any line | |
59 | to multiple spaces before calling FUNCTION. | |
60 | FUNCTION is called with three arguments: | |
61 | position of start of segment of this line within the rectangle, | |
62 | number of columns that belong to rectangle but are before that position, | |
63 | number of columns that belong to rectangle but are after point. | |
64 | Point is at the end of the segment of this line within the rectangle." | |
65 | (let (startcol startlinepos endcol endlinepos) | |
66 | (save-excursion | |
67 | (goto-char start) | |
68 | (setq startcol (current-column)) | |
69 | (beginning-of-line) | |
70 | (setq startlinepos (point))) | |
71 | (save-excursion | |
72 | (goto-char end) | |
73 | (setq endcol (current-column)) | |
74 | (forward-line 1) | |
75 | (setq endlinepos (point-marker))) | |
76 | (if (< endcol startcol) | |
08ce70d1 | 77 | (setq startcol (prog1 endcol (setq endcol startcol)))) |
bc8ea543 RS |
78 | (save-excursion |
79 | (goto-char startlinepos) | |
80 | (while (< (point) endlinepos) | |
81 | (let (startpos begextra endextra) | |
e40261d0 | 82 | (if coerce-tabs |
b9e81d0a | 83 | (move-to-column startcol t) |
e40261d0 | 84 | (move-to-column startcol)) |
bc8ea543 RS |
85 | (setq begextra (- (current-column) startcol)) |
86 | (setq startpos (point)) | |
e40261d0 | 87 | (if coerce-tabs |
b9e81d0a | 88 | (move-to-column endcol t) |
e40261d0 | 89 | (move-to-column endcol)) |
daabd795 RS |
90 | ;; If we overshot, move back one character |
91 | ;; so that endextra will be positive. | |
92 | (if (and (not coerce-tabs) (> (current-column) endcol)) | |
93 | (backward-char 1)) | |
bc8ea543 RS |
94 | (setq endextra (- endcol (current-column))) |
95 | (if (< begextra 0) | |
96 | (setq endextra (+ endextra begextra) | |
97 | begextra 0)) | |
98 | (funcall function startpos begextra endextra)) | |
99 | (forward-line 1))) | |
a2535589 JA |
100 | (- endcol startcol))) |
101 | ||
e417c66f RS |
102 | ;; The replacement for `operate-on-rectangle' -- dv |
103 | (defun apply-on-rectangle (function start end &rest args) | |
104 | "Call FUNCTION for each line of rectangle with corners at START, END. | |
105 | FUNCTION is called with two arguments: the start and end columns of the | |
e037c34c | 106 | rectangle, plus ARGS extra arguments. Point is at the beginning of line when |
e417c66f RS |
107 | the function is called." |
108 | (let (startcol startpt endcol endpt) | |
109 | (save-excursion | |
110 | (goto-char start) | |
111 | (setq startcol (current-column)) | |
112 | (beginning-of-line) | |
113 | (setq startpt (point)) | |
114 | (goto-char end) | |
115 | (setq endcol (current-column)) | |
116 | (forward-line 1) | |
117 | (setq endpt (point-marker)) | |
118 | ;; ensure the start column is the left one. | |
119 | (if (< endcol startcol) | |
120 | (let ((col startcol)) | |
121 | (setq startcol endcol endcol col))) | |
122 | ;; start looping over lines | |
123 | (goto-char startpt) | |
124 | (while (< (point) endpt) | |
125 | (apply function startcol endcol args) | |
126 | (forward-line 1))) | |
127 | )) | |
128 | ||
129 | (defun delete-rectangle-line (startcol endcol fill) | |
b9e81d0a SM |
130 | (when (= (move-to-column startcol (or fill 'coerce)) startcol) |
131 | (delete-region (point) | |
132 | (progn (move-to-column endcol 'coerce) | |
133 | (point))))) | |
e417c66f RS |
134 | |
135 | (defun delete-extract-rectangle-line (startcol endcol lines fill) | |
136 | (let ((pt (point-at-eol))) | |
b9e81d0a | 137 | (if (< (move-to-column startcol (or fill 'coerce)) startcol) |
e417c66f RS |
138 | (setcdr lines (cons (spaces-string (- endcol startcol)) |
139 | (cdr lines))) | |
140 | ;; else | |
141 | (setq pt (point)) | |
b9e81d0a | 142 | (move-to-column endcol t) |
e417c66f RS |
143 | (setcdr lines (cons (buffer-substring pt (point)) (cdr lines))) |
144 | (delete-region pt (point))) | |
145 | )) | |
146 | ||
147 | ;; ### NOTE: this is actually the only function that needs to do complicated | |
148 | ;; stuff like what's happening in `operate-on-rectangle', because the buffer | |
149 | ;; might be read-only. --dv | |
150 | (defun extract-rectangle-line (startcol endcol lines) | |
151 | (let (start end begextra endextra line) | |
152 | (move-to-column startcol) | |
153 | (setq start (point) | |
154 | begextra (- (current-column) startcol)) | |
155 | (move-to-column endcol) | |
156 | (setq end (point) | |
157 | endextra (- endcol (current-column))) | |
158 | (setq line (buffer-substring start (point))) | |
159 | (if (< begextra 0) | |
160 | (setq endextra (+ endextra begextra) | |
161 | begextra 0)) | |
162 | (if (< endextra 0) | |
163 | (setq endextra 0)) | |
164 | (goto-char start) | |
a2535589 JA |
165 | (while (search-forward "\t" end t) |
166 | (let ((width (- (current-column) | |
167 | (save-excursion (forward-char -1) | |
168 | (current-column))))) | |
169 | (setq line (concat (substring line 0 (- (point) end 1)) | |
170 | (spaces-string width) | |
e417c66f RS |
171 | (substring line (+ (length line) |
172 | (- (point) end))))))) | |
a2535589 JA |
173 | (if (or (> begextra 0) (> endextra 0)) |
174 | (setq line (concat (spaces-string begextra) | |
175 | line | |
176 | (spaces-string endextra)))) | |
e417c66f | 177 | (setcdr lines (cons line (cdr lines))))) |
a2535589 JA |
178 | |
179 | (defconst spaces-strings | |
180 | '["" " " " " " " " " " " " " " " " "]) | |
181 | ||
e417c66f | 182 | ;; this one is untouched --dv |
a2535589 JA |
183 | (defun spaces-string (n) |
184 | (if (<= n 8) (aref spaces-strings n) | |
185 | (let ((val "")) | |
186 | (while (> n 8) | |
187 | (setq val (concat " " val) | |
188 | n (- n 8))) | |
189 | (concat val (aref spaces-strings n))))) | |
f1180544 | 190 | |
f9f9507e | 191 | ;;;###autoload |
e417c66f | 192 | (defun delete-rectangle (start end &optional fill) |
e037c34c DL |
193 | "Delete (don't save) text in the region-rectangle. |
194 | The same range of columns is deleted in each line starting with the | |
195 | line where the region begins and ending with the line where the region | |
196 | ends. | |
197 | ||
198 | When called from a program the rectangle's corners are START and END. | |
199 | With a prefix (or a FILL) argument, also fill lines where nothing has | |
200 | to be deleted." | |
201 | (interactive "*r\nP") | |
e417c66f | 202 | (apply-on-rectangle 'delete-rectangle-line start end fill)) |
a2535589 | 203 | |
f9f9507e | 204 | ;;;###autoload |
e417c66f | 205 | (defun delete-extract-rectangle (start end &optional fill) |
7db6139a | 206 | "Delete the contents of the rectangle with corners at START and END. |
e037c34c | 207 | Return it as a list of strings, one for each line of the rectangle. |
e417c66f | 208 | |
e037c34c | 209 | When called from a program the rectangle's corners are START and END. |
e417c66f RS |
210 | With an optional FILL argument, also fill lines where nothing has to be |
211 | deleted." | |
212 | (let ((lines (list nil))) | |
213 | (apply-on-rectangle 'delete-extract-rectangle-line start end lines fill) | |
214 | (nreverse (cdr lines)))) | |
a2535589 | 215 | |
f9f9507e | 216 | ;;;###autoload |
a2535589 | 217 | (defun extract-rectangle (start end) |
e037c34c DL |
218 | "Return the contents of the rectangle with corners at START and END. |
219 | Return it as a list of strings, one for each line of the rectangle." | |
e417c66f RS |
220 | (let ((lines (list nil))) |
221 | (apply-on-rectangle 'extract-rectangle-line start end lines) | |
222 | (nreverse (cdr lines)))) | |
a2535589 JA |
223 | |
224 | (defvar killed-rectangle nil | |
e037c34c | 225 | "Rectangle for `yank-rectangle' to insert.") |
a2535589 | 226 | |
f9f9507e | 227 | ;;;###autoload |
e417c66f | 228 | (defun kill-rectangle (start end &optional fill) |
e037c34c DL |
229 | "Delete the region-rectangle and save it as the last killed one. |
230 | ||
231 | When called from a program the rectangle's corners are START and END. | |
232 | You might prefer to use `delete-extract-rectangle' from a program. | |
e417c66f RS |
233 | |
234 | With a prefix (or a FILL) argument, also fill lines where nothing has to be | |
235 | deleted." | |
e037c34c | 236 | (interactive "*r\nP") |
e417c66f RS |
237 | (when buffer-read-only |
238 | (setq killed-rectangle (extract-rectangle start end)) | |
239 | (barf-if-buffer-read-only)) | |
240 | (setq killed-rectangle (delete-extract-rectangle start end fill))) | |
241 | ||
242 | ;; this one is untouched --dv | |
f9f9507e | 243 | ;;;###autoload |
a2535589 JA |
244 | (defun yank-rectangle () |
245 | "Yank the last killed rectangle with upper left corner at point." | |
e037c34c | 246 | (interactive "*") |
a2535589 JA |
247 | (insert-rectangle killed-rectangle)) |
248 | ||
e417c66f | 249 | ;; this one is untoutched --dv |
f9f9507e | 250 | ;;;###autoload |
a2535589 JA |
251 | (defun insert-rectangle (rectangle) |
252 | "Insert text of RECTANGLE with upper left corner at point. | |
573f9b32 RS |
253 | RECTANGLE's first line is inserted at point, its second |
254 | line is inserted at a point vertically under point, etc. | |
23317eac RS |
255 | RECTANGLE should be a list of strings. |
256 | After this command, the mark is at the upper left corner | |
257 | and point is at the lower right corner." | |
a2535589 JA |
258 | (let ((lines rectangle) |
259 | (insertcolumn (current-column)) | |
260 | (first t)) | |
23317eac | 261 | (push-mark) |
a2535589 JA |
262 | (while lines |
263 | (or first | |
264 | (progn | |
265 | (forward-line 1) | |
266 | (or (bolp) (insert ?\n)) | |
b9e81d0a | 267 | (move-to-column insertcolumn t))) |
a2535589 | 268 | (setq first nil) |
afa0467f | 269 | (insert-for-yank (car lines)) |
a2535589 JA |
270 | (setq lines (cdr lines))))) |
271 | ||
f9f9507e | 272 | ;;;###autoload |
e417c66f | 273 | (defun open-rectangle (start end &optional fill) |
e037c34c DL |
274 | "Blank out the region-rectangle, shifting text right. |
275 | ||
276 | The text previously in the region is not overwritten by the blanks, | |
277 | but instead winds up to the right of the rectangle. | |
e417c66f | 278 | |
e037c34c | 279 | When called from a program the rectangle's corners are START and END. |
e417c66f RS |
280 | With a prefix (or a FILL) argument, fill with blanks even if there is no text |
281 | on the right side of the rectangle." | |
e037c34c | 282 | (interactive "*r\nP") |
e417c66f | 283 | (apply-on-rectangle 'open-rectangle-line start end fill) |
08ce70d1 | 284 | (goto-char start)) |
a2535589 | 285 | |
e417c66f | 286 | (defun open-rectangle-line (startcol endcol fill) |
b9e81d0a | 287 | (when (= (move-to-column startcol (or fill 'coerce)) startcol) |
74be0ade DL |
288 | (unless (and (not fill) |
289 | (= (point) (point-at-eol))) | |
290 | (indent-to endcol)))) | |
e417c66f RS |
291 | |
292 | (defun delete-whitespace-rectangle-line (startcol endcol fill) | |
b9e81d0a | 293 | (when (= (move-to-column startcol (or fill 'coerce)) startcol) |
e417c66f | 294 | (unless (= (point) (point-at-eol)) |
35f901fa | 295 | (delete-region (point) (progn (skip-syntax-forward " ") (point)))))) |
a2535589 | 296 | |
b3a4edce MR |
297 | ;;;###autoload |
298 | (defalias 'close-rectangle 'delete-whitespace-rectangle) ;; Old name | |
299 | ||
ecb079ed | 300 | ;;;###autoload |
e417c66f | 301 | (defun delete-whitespace-rectangle (start end &optional fill) |
ecb079ed RS |
302 | "Delete all whitespace following a specified column in each line. |
303 | The left edge of the rectangle specifies the position in each line | |
304 | at which whitespace deletion should begin. On each line in the | |
e417c66f | 305 | rectangle, all continuous whitespace starting at that column is deleted. |
ecb079ed | 306 | |
e037c34c | 307 | When called from a program the rectangle's corners are START and END. |
e417c66f | 308 | With a prefix (or a FILL) argument, also fill too short lines." |
e037c34c | 309 | (interactive "*r\nP") |
e417c66f RS |
310 | (apply-on-rectangle 'delete-whitespace-rectangle-line start end fill)) |
311 | ||
312 | ;; not used any more --dv | |
3d1b9783 RS |
313 | ;; string-rectangle uses this variable to pass the string |
314 | ;; to string-rectangle-line. | |
315 | (defvar string-rectangle-string) | |
b9e81d0a | 316 | (defvar string-rectangle-history nil) |
197615f3 | 317 | (defun string-rectangle-line (startcol endcol string delete) |
b9e81d0a | 318 | (move-to-column startcol t) |
197615f3 DL |
319 | (if delete |
320 | (delete-rectangle-line startcol endcol nil)) | |
e417c66f | 321 | (insert string)) |
131ca136 | 322 | |
852eeeaf | 323 | ;;;###autoload |
35f901fa GM |
324 | (defun string-rectangle (start end string) |
325 | "Replace rectangle contents with STRING on each line. | |
326 | The length of STRING need not be the same as the rectangle width. | |
327 | ||
328 | Called from a program, takes three args; START, END and STRING." | |
b9e81d0a SM |
329 | (interactive |
330 | (progn (barf-if-buffer-read-only) | |
331 | (list | |
332 | (region-beginning) | |
333 | (region-end) | |
334 | (read-string (format "String rectangle (default `%s'): " | |
335 | (or (car string-rectangle-history) "")) | |
336 | nil 'string-rectangle-history | |
337 | (car string-rectangle-history))))) | |
197615f3 | 338 | (apply-on-rectangle 'string-rectangle-line start end string t)) |
852eeeaf | 339 | |
0c54cd99 | 340 | ;;;###autoload |
35f901fa GM |
341 | (defalias 'replace-rectangle 'string-rectangle) |
342 | ||
343 | ;;;###autoload | |
344 | (defun string-insert-rectangle (start end string) | |
345 | "Insert STRING on each line of region-rectangle, shifting text right. | |
346 | ||
347 | When called from a program, the rectangle's corners are START and END. | |
348 | The left edge of the rectangle specifies the column for insertion. | |
349 | This command does not delete or overwrite any existing text." | |
b9e81d0a SM |
350 | (interactive |
351 | (progn (barf-if-buffer-read-only) | |
352 | (list | |
353 | (region-beginning) | |
354 | (region-end) | |
355 | (read-string (format "String insert rectangle (default `%s'): " | |
356 | (or (car string-rectangle-history) "")) | |
357 | nil 'string-rectangle-history | |
358 | (car string-rectangle-history))))) | |
35f901fa GM |
359 | (apply-on-rectangle 'string-rectangle-line start end string nil)) |
360 | ||
f9f9507e | 361 | ;;;###autoload |
e417c66f | 362 | (defun clear-rectangle (start end &optional fill) |
e037c34c DL |
363 | "Blank out the region-rectangle. |
364 | The text previously in the region is overwritten with blanks. | |
e417c66f | 365 | |
e037c34c | 366 | When called from a program the rectangle's corners are START and END. |
e417c66f RS |
367 | With a prefix (or a FILL) argument, also fill with blanks the parts of the |
368 | rectangle which were empty." | |
e037c34c | 369 | (interactive "*r\nP") |
e417c66f RS |
370 | (apply-on-rectangle 'clear-rectangle-line start end fill)) |
371 | ||
372 | (defun clear-rectangle-line (startcol endcol fill) | |
7dfee029 | 373 | (let ((pt (point-at-eol))) |
b9e81d0a | 374 | (when (= (move-to-column startcol (or fill 'coerce)) startcol) |
e417c66f RS |
375 | (if (and (not fill) |
376 | (<= (save-excursion (goto-char pt) (current-column)) endcol)) | |
377 | (delete-region (point) pt) | |
378 | ;; else | |
379 | (setq pt (point)) | |
b9e81d0a | 380 | (move-to-column endcol t) |
7dfee029 | 381 | (setq endcol (current-column)) |
e417c66f | 382 | (delete-region pt (point)) |
7dfee029 | 383 | (indent-to endcol))))) |
a2535589 | 384 | |
08ce70d1 | 385 | (provide 'rect) |
6594deb0 ER |
386 | |
387 | ;;; rect.el ends here |