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1 | ;;; rect.el --- rectangle functions for GNU Emacs. |
2 | ||
9750e079 ER |
3 | ;; Copyright (C) 1985 Free Software Foundation, Inc. |
4 | ||
4821e2af | 5 | ;; Maintainer: FSF |
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 | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
22 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
4821e2af | 24 | ;;; Code: |
a2535589 JA |
25 | |
26 | (defun operate-on-rectangle (function start end coerce-tabs) | |
27 | "Call FUNCTION for each line of rectangle with corners at START, END. | |
28 | If COERCE-TABS is non-nil, convert multi-column characters | |
29 | that span the starting or ending columns on any line | |
30 | to multiple spaces before calling FUNCTION. | |
31 | FUNCTION is called with three arguments: | |
32 | position of start of segment of this line within the rectangle, | |
33 | number of columns that belong to rectangle but are before that position, | |
34 | number of columns that belong to rectangle but are after point. | |
35 | Point is at the end of the segment of this line within the rectangle." | |
36 | (let (startcol startlinepos endcol endlinepos) | |
37 | (save-excursion | |
38 | (goto-char start) | |
39 | (setq startcol (current-column)) | |
40 | (beginning-of-line) | |
41 | (setq startlinepos (point))) | |
42 | (save-excursion | |
43 | (goto-char end) | |
44 | (setq endcol (current-column)) | |
45 | (forward-line 1) | |
46 | (setq endlinepos (point-marker))) | |
47 | (if (< endcol startcol) | |
48 | (let ((tem startcol)) | |
49 | (setq startcol endcol endcol tem))) | |
50 | (if (/= endcol startcol) | |
51 | (save-excursion | |
52 | (goto-char startlinepos) | |
53 | (while (< (point) endlinepos) | |
54 | (let (startpos begextra endextra) | |
55 | (move-to-column startcol) | |
56 | (and coerce-tabs | |
57 | (> (current-column) startcol) | |
58 | (rectangle-coerce-tab startcol)) | |
59 | (setq begextra (- (current-column) startcol)) | |
60 | (setq startpos (point)) | |
61 | (move-to-column endcol) | |
62 | (if (> (current-column) endcol) | |
63 | (if coerce-tabs | |
64 | (rectangle-coerce-tab endcol) | |
65 | (forward-char -1))) | |
66 | (setq endextra (- endcol (current-column))) | |
67 | (if (< begextra 0) | |
68 | (setq endextra (+ endextra begextra) | |
69 | begextra 0)) | |
70 | (funcall function startpos begextra endextra)) | |
71 | (forward-line 1)))) | |
72 | (- endcol startcol))) | |
73 | ||
74 | (defun delete-rectangle-line (startdelpos ignore ignore) | |
75 | (delete-region startdelpos (point))) | |
76 | ||
77 | (defun delete-extract-rectangle-line (startdelpos begextra endextra) | |
78 | (save-excursion | |
79 | (extract-rectangle-line startdelpos begextra endextra)) | |
80 | (delete-region startdelpos (point))) | |
81 | ||
82 | (defun extract-rectangle-line (startdelpos begextra endextra) | |
83 | (let ((line (buffer-substring startdelpos (point))) | |
84 | (end (point))) | |
85 | (goto-char startdelpos) | |
86 | (while (search-forward "\t" end t) | |
87 | (let ((width (- (current-column) | |
88 | (save-excursion (forward-char -1) | |
89 | (current-column))))) | |
90 | (setq line (concat (substring line 0 (- (point) end 1)) | |
91 | (spaces-string width) | |
92 | (substring line (+ (length line) (- (point) end))))))) | |
93 | (if (or (> begextra 0) (> endextra 0)) | |
94 | (setq line (concat (spaces-string begextra) | |
95 | line | |
96 | (spaces-string endextra)))) | |
97 | (setq lines (cons line lines)))) | |
98 | ||
99 | (defconst spaces-strings | |
100 | '["" " " " " " " " " " " " " " " " "]) | |
101 | ||
102 | (defun spaces-string (n) | |
103 | (if (<= n 8) (aref spaces-strings n) | |
104 | (let ((val "")) | |
105 | (while (> n 8) | |
106 | (setq val (concat " " val) | |
107 | n (- n 8))) | |
108 | (concat val (aref spaces-strings n))))) | |
109 | ||
f9f9507e | 110 | ;;;###autoload |
a2535589 JA |
111 | (defun delete-rectangle (start end) |
112 | "Delete (don't save) text in rectangle with point and mark as corners. | |
573f9b32 RS |
113 | The same range of columns is deleted in each line starting with the line |
114 | where the region begins and ending with the line where the region ends." | |
a2535589 JA |
115 | (interactive "r") |
116 | (operate-on-rectangle 'delete-rectangle-line start end t)) | |
117 | ||
f9f9507e | 118 | ;;;###autoload |
a2535589 JA |
119 | (defun delete-extract-rectangle (start end) |
120 | "Delete contents of rectangle and return it as a list of strings. | |
121 | Arguments START and END are the corners of the rectangle. | |
122 | The value is list of strings, one for each line of the rectangle." | |
123 | (let (lines) | |
124 | (operate-on-rectangle 'delete-extract-rectangle-line | |
125 | start end t) | |
126 | (nreverse lines))) | |
127 | ||
f9f9507e | 128 | ;;;###autoload |
a2535589 JA |
129 | (defun extract-rectangle (start end) |
130 | "Return contents of rectangle with corners at START and END. | |
131 | Value is list of strings, one for each line of the rectangle." | |
132 | (let (lines) | |
133 | (operate-on-rectangle 'extract-rectangle-line start end nil) | |
134 | (nreverse lines))) | |
135 | ||
136 | (defvar killed-rectangle nil | |
137 | "Rectangle for yank-rectangle to insert.") | |
138 | ||
f9f9507e | 139 | ;;;###autoload |
a2535589 JA |
140 | (defun kill-rectangle (start end) |
141 | "Delete rectangle with corners at point and mark; save as last killed one. | |
142 | Calling from program, supply two args START and END, buffer positions. | |
573f9b32 | 143 | But in programs you might prefer to use `delete-extract-rectangle'." |
a2535589 JA |
144 | (interactive "r") |
145 | (setq killed-rectangle (delete-extract-rectangle start end))) | |
146 | ||
f9f9507e | 147 | ;;;###autoload |
a2535589 JA |
148 | (defun yank-rectangle () |
149 | "Yank the last killed rectangle with upper left corner at point." | |
150 | (interactive) | |
151 | (insert-rectangle killed-rectangle)) | |
152 | ||
f9f9507e | 153 | ;;;###autoload |
a2535589 JA |
154 | (defun insert-rectangle (rectangle) |
155 | "Insert text of RECTANGLE with upper left corner at point. | |
573f9b32 RS |
156 | RECTANGLE's first line is inserted at point, its second |
157 | line is inserted at a point vertically under point, etc. | |
a2535589 JA |
158 | RECTANGLE should be a list of strings." |
159 | (let ((lines rectangle) | |
160 | (insertcolumn (current-column)) | |
161 | (first t)) | |
162 | (while lines | |
163 | (or first | |
164 | (progn | |
165 | (forward-line 1) | |
166 | (or (bolp) (insert ?\n)) | |
167 | (move-to-column insertcolumn) | |
168 | (if (> (current-column) insertcolumn) | |
169 | (rectangle-coerce-tab insertcolumn)) | |
170 | (if (< (current-column) insertcolumn) | |
171 | (indent-to insertcolumn)))) | |
172 | (setq first nil) | |
173 | (insert (car lines)) | |
174 | (setq lines (cdr lines))))) | |
175 | ||
f9f9507e | 176 | ;;;###autoload |
a2535589 JA |
177 | (defun open-rectangle (start end) |
178 | "Blank out rectangle with corners at point and mark, shifting text right. | |
179 | The text previously in the region is not overwritten by the blanks, | |
180 | but insted winds up to the right of the rectangle." | |
181 | (interactive "r") | |
182 | (operate-on-rectangle 'open-rectangle-line start end nil)) | |
183 | ||
184 | (defun open-rectangle-line (startpos begextra endextra) | |
185 | (let ((column (+ (current-column) begextra endextra))) | |
186 | (goto-char startpos) | |
187 | (let ((ocol (current-column))) | |
188 | (skip-chars-forward " \t") | |
189 | (setq column (+ column (- (current-column) ocol)))) | |
190 | (delete-region (point) | |
191 | (progn (skip-chars-backward " \t") | |
192 | (point))) | |
193 | (indent-to column))) | |
194 | ||
f9f9507e | 195 | ;;;###autoload |
a2535589 JA |
196 | (defun clear-rectangle (start end) |
197 | "Blank out rectangle with corners at point and mark. | |
198 | The text previously in the region is overwritten by the blanks. | |
199 | When called from a program, requires two args which specify the corners." | |
200 | (interactive "r") | |
201 | (operate-on-rectangle 'clear-rectangle-line start end t)) | |
202 | ||
203 | (defun clear-rectangle-line (startpos begextra endextra) | |
204 | (skip-chars-forward " \t") | |
205 | (let ((column (+ (current-column) endextra))) | |
206 | (delete-region (point) | |
207 | (progn (goto-char startpos) | |
208 | (skip-chars-backward " \t") | |
209 | (point))) | |
210 | (indent-to column))) | |
211 | ||
212 | (defun rectangle-coerce-tab (column) | |
213 | (let ((aftercol (current-column)) | |
214 | (indent-tabs-mode nil)) | |
215 | (delete-char -1) | |
216 | (indent-to aftercol) | |
217 | (backward-char (- aftercol column)))) | |
6594deb0 ER |
218 | |
219 | ;;; rect.el ends here |