* Suggested new transpose-rectangle command
@ 2006-08-13 6:44 Gustav Hållberg
2006-08-13 20:49 ` Gustav Hållberg
0 siblings, 1 reply; 2+ messages in thread
From: Gustav Hållberg @ 2006-08-13 6:44 UTC (permalink / raw)
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I somewhat often find myself wanting to mirror or transpose a
rectangle (optionally transposing the lines and/or the columns within
the rectangle).
Attaching a proposed patch that adds such a command.
- Gustav
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[-- Attachment #2: transpose-rect.patch --]
[-- Type: text/x-patch; name="transpose-rect.patch", Size: 2423 bytes --]
Index: lisp/rect.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/rect.el,v
retrieving revision 1.52
diff -u -r1.52 rect.el
--- lisp/rect.el 8 Apr 2006 10:30:19 -0000 1.52
+++ lisp/rect.el 13 Aug 2006 06:40:26 -0000
@@ -392,6 +392,57 @@
(delete-region pt (point))
(indent-to endcol)))))
+(defun transpose-array (array)
+ "Returns a new array which is a transposed copy of
+ARRAY (vector, string, or bool-vector)."
+ (let* ((length (length array))
+ (result (apply (cond ((vectorp array) 'make-vector)
+ ((stringp array) 'make-string)
+ ((bool-vector-p array) 'make-bool-vector)
+ (t (signal 'wrong-type-argument '(arrayp array))))
+ (list length 0)))
+ (index length))
+ (while (> index 0)
+ (setq index (1- index))
+ (aset result index (aref array (- length 1 index))))
+ result))
+
+(defun ntranspose-array (array)
+ "Transposes the characters in ARRAY. Returns ARRAY."
+ (let* ((length (length array))
+ (index (/ length 2)))
+ (while (> index 0)
+ (setq index (1- index))
+ (let ((tmp (aref array index)))
+ (aset array index (aref array (- length 1 index)))
+ (aset array (- length 1 index) tmp)))
+ array))
+
+;;;###autoload
+(defun transpose-rectangle (start end &optional horizontal vertical)
+ "Replace the region-rectangle with its mirror image.
+
+By default, only horizontal transposition is done. With a prefix
+argument, ask whether to transpose horizontally and/or vertically.
+
+If HORIZONTAL is non-nil, each line in the rectangle is transposed.
+If VERTICAL is non-nil, all lines in the rectangle are transposed.
+
+When called from a program, the rectangle's corners are START and END."
+ (interactive
+ (append (list (region-beginning) (region-end))
+ (if current-prefix-arg
+ (list (y-or-n-p "Transpose horizontally? ")
+ (y-or-n-p "Transpose vertically? "))
+ '(t nil))))
+ (let ((rect (delete-extract-rectangle start end)))
+ (when vertical
+ (setq rect (nreverse rect)))
+ (when horizontal
+ (setq rect (mapcar (function ntranspose-array) rect)))
+ (goto-char start)
+ (insert-rectangle rect)))
+
(provide 'rect)
;;; arch-tag: 178847b3-1f50-4b03-83de-a6e911cc1d16
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Suggested new transpose-rectangle command
2006-08-13 6:44 Suggested new transpose-rectangle command Gustav Hållberg
@ 2006-08-13 20:49 ` Gustav Hållberg
0 siblings, 0 replies; 2+ messages in thread
From: Gustav Hållberg @ 2006-08-13 20:49 UTC (permalink / raw)
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On 8/12/06, Gustav Hållberg <gustav@gmail.com> wrote:
> Attaching a proposed patch that adds such a command.
Erh, that patch was broken, sorry about that.
Attaching a better one!
- Gustav
PS. Maybe a better command name would be (mirror-rectangle)
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[-- Attachment #2: transpose-rect.patch --]
[-- Type: text/x-patch; name="transpose-rect.patch", Size: 2050 bytes --]
Index: lisp/rect.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/rect.el,v
retrieving revision 1.52
diff -u -r1.52 rect.el
--- lisp/rect.el 8 Apr 2006 10:30:19 -0000 1.52
+++ lisp/rect.el 13 Aug 2006 20:44:44 -0000
@@ -392,6 +392,46 @@
(delete-region pt (point))
(indent-to endcol)))))
+(defun transpose-array (array)
+ "Returns a new array which is a transposed copy of
+ARRAY (vector, string, or bool-vector)."
+ (let* ((length (length array))
+ (result (apply (cond ((vectorp array) 'make-vector)
+ ((stringp array) 'make-string)
+ ((bool-vector-p array) 'make-bool-vector)
+ (t (signal 'wrong-type-argument '(arrayp array))))
+ (list length 0)))
+ (index length))
+ (while (> index 0)
+ (setq index (1- index))
+ (aset result index (aref array (- length 1 index))))
+ result))
+
+;;;###autoload
+(defun transpose-rectangle (start end &optional horizontal vertical)
+ "Replace the region-rectangle with its mirror image.
+
+By default, only horizontal transposition is done. With a prefix
+argument, ask whether to transpose horizontally and/or vertically.
+
+If HORIZONTAL is non-nil, each line in the rectangle is transposed.
+If VERTICAL is non-nil, all lines in the rectangle are transposed.
+
+When called from a program, the rectangle's corners are START and END."
+ (interactive
+ (append (list (region-beginning) (region-end))
+ (if current-prefix-arg
+ (list (y-or-n-p "Transpose horizontally? ")
+ (y-or-n-p "Transpose vertically? "))
+ '(t nil))))
+ (let ((rect (delete-extract-rectangle start end)))
+ (when vertical
+ (setq rect (reverse rect)))
+ (when horizontal
+ (setq rect (mapcar (function transpose-array) rect)))
+ (goto-char start)
+ (insert-rectangle rect)))
+
(provide 'rect)
;;; arch-tag: 178847b3-1f50-4b03-83de-a6e911cc1d16
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