Re: how to reverse a region of several words?

[tyler <tyler.smith@mail.mcgill.ca>]

sunway <sunwayforever@gmail.com> writes:

> e.g. the region contains words like "aaa bbb ccc ddd",I want to
> reverse it to "ddd ccc bbb aaa"
>

I think you probably want the words themselves to stay in the original
order, i.e., one two => two one? If not, if you want to completely
reverse the text, i.e., one two => owt eno, I use the following
function:

(defun reverse-string (beg1 end2)
  "Reverse the order of characters in a region.
From a program takes two point or marker arguments, BEG1 and END2."
  (interactive "r")
  (if (> beg1 end2)
      (let (mid) (setq mid end2 end2 beg1 beg1 mid)))
  (while (< beg1 (1- end2))
	(let ((end1 (1+ beg1))
		  (beg2 (1- end2)))
	  (transpose-regions beg1 end1 beg2 end2))
	(incf beg1)
	(decf end2)))

Cheers,

Tyler
-- 
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birds.                                 --Richard Feynman