Re: Apply a transformation on a region

[jpkotta]

On Mar 3, 7:37 am, p...@informatimago.com (Pascal J. Bourguignon)
wrote:
> bdsatish <bdsat...@gmail.com> writes:
> > Hello,
>
> > I have a simple text file in the buffer with following contents,
>
> > ABC00001
> > ABC00002
> > ABC00003
> > ABC00004
> > ABC00005
>
> > and so on till  1000 lines.  The number in each line must be
> > incremented, so that after applying an "increment macro", the buffer
> > should reflect
>
> > ABC00002
> > ABC00003
> > ABC00004
> > ABC00005
> > ABC00006
>
> > till  1001
>
> > I want to know how to do it using Emacs-lisp (i dont care about shell
> > scripts or python)
>
> (defun shift-lines ()
>   (interactive)
>   (goto-line 1)
>   (kill-line)
>   (goto-line 999)
>   (let ((n (let ((bol (progn (beginning-of-line) (point))))
>               (parse-integer (buffer-substring (+ 3 bol) (+ 8 bol))))))
>     (goto-line 1000)
>     (insert (format "ABC%05d\n" (1+ n)))))
>
> --
> __Pascal Bourguignon__http://www.informatimago.com

A slower but perhaps more general way is to do a replace-regexp from \
(ABC\)\([0-9]+\) to \1\,(format "%05d" (1+ (string-to-number \2)))).