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Make transpose-regions interactive (Bug#30343)

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* doc/emacs/fixit.texi (Transpose): Mention and explain the new
command.
* editfns.c (Ftranspose_regions): Add an interactive calling
specification, and add documentation for it.
This commit is contained in:
Charles A. Roelli 2018-03-11 11:59:01 +01:00
parent 806a0c7749
commit b88e7c8bcd
2 changed files with 29 additions and 2 deletions
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11
doc/emacs/fixit.texi
View file

@ -149,6 +149,8 @@ Transpose two words (@code{transpose-words}).
Transpose two balanced expressions (@code{transpose-sexps}).
@item C-x C-t
Transpose two lines (@code{transpose-lines}).
@item M-x transpose-regions
Transpose two regions.
@end table
@kindex C-t
@ -204,6 +206,15 @@ otherwise a command with a repeat count of zero would do nothing): to
transpose the character (or word or expression or line) ending after
point with the one ending after the mark.
@findex transpose-regions
@kbd{M-x transpose-regions} transposes the text between point and
mark with the text between the last two marks pushed to the mark ring
(@pxref{Setting Mark}). With a numeric prefix argument, it transposes
the text between point and mark with the text between two successive
marks that many entries back in the mark ring. This command is best
used for transposing multiple characters (or words or sentences or
paragraphs) in one go.
@node Fixing Case
@section Case Conversion

20
src/editfns.c
View file

@ -5100,7 +5100,16 @@ transpose_markers (ptrdiff_t start1, ptrdiff_t end1,
}
}
DEFUN ("transpose-regions", Ftranspose_regions, Stranspose_regions, 4, 5, 0,
DEFUN ("transpose-regions", Ftranspose_regions, Stranspose_regions, 4, 5,
"(if (< (length mark-ring) 2)\
(error \"Other region must be marked before transposing two regions\")\
(let* ((num (if current-prefix-arg\
(prefix-numeric-value current-prefix-arg)\
0))\
(ring-length (length mark-ring))\
(eltnum (mod num ring-length))\
(eltnum2 (mod (1+ num) ring-length)))\
(list (point) (mark) (elt mark-ring eltnum) (elt mark-ring eltnum2))))",
doc: /* Transpose region STARTR1 to ENDR1 with STARTR2 to ENDR2.
The regions should not be overlapping, because the size of the buffer is
never changed in a transposition.
@ -5108,7 +5117,14 @@ never changed in a transposition.
Optional fifth arg LEAVE-MARKERS, if non-nil, means don't update
any markers that happen to be located in the regions.
Transposing beyond buffer boundaries is an error. */)
Transposing beyond buffer boundaries is an error.
Interactively, STARTR1 and ENDR1 are point and mark; STARTR2 and ENDR2
are the last two marks pushed to the mark ring; LEAVE-MARKERS is nil.
If a prefix argument N is given, STARTR2 and ENDR2 are the two
successive marks N entries back in the mark ring. A negative prefix
argument instead counts forward from the oldest mark in the mark
ring. */)
(Lisp_Object startr1, Lisp_Object endr1, Lisp_Object startr2, Lisp_Object endr2, Lisp_Object leave_markers)
{
register ptrdiff_t start1, end1, start2, end2;