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From: Decebal <CLDWesterhof@gmail.com>
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Subject: Re: Writing a function for a indented copy of a region
Date: Wed, 17 Dec 2008 15:37:37 -0800 (PST)
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On 17 dec, 20:47, Andreas Politz <poli...@fh-trier.de> wrote:
> Why not work with a string, instead of messing with your buffers undo his=
tory.
>
> (defun kill-save-indent-region (indent start end)
> =A0 =A0(interactive "p\nr")
> =A0 =A0(kill-new (replace-regexp-in-string
> =A0 =A0 =A0 =A0 =A0 =A0 =A0"^" =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0;or "^\\s-*"
> =A0 =A0 =A0 =A0 =A0 =A0 =A0(format (format "%%%ds" (case indent
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0(0 1)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0(1 4)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0(t indent)))
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0"")
> =A0 =A0 =A0 =A0 =A0 =A0 =A0(buffer-substring start end)))
> =A0 =A0(deactivate-mark))

Looking at your code I should replace:
        (indent-rigidly (region-beginning) (region-end) indent)
        (if do-kill
            (kill-region (region-beginning) (region-end))
          (copy-region-as-kill (region-beginning) (region-end))
          (undo)
          )
with:
        (kill-new (replace-regexp-in-string
                   "^"
                   (format (format "%%%ds" indent) "")
                   (filter-buffer-substring (region-beginning) (region-
end) do-kill)
                   )
                  )

but then I get that filter-buffer-substring is void. What am I doing
wrong?