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Re: avoid narrow-to-region (was: Re: replace-regexp)
From: |
Emanuel Berg |
Subject: |
Re: avoid narrow-to-region (was: Re: replace-regexp) |
Date: |
Sun, 09 May 2021 14:43:40 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Yuri Khan wrote:
> (defun yk-shuffle-lines (begin end)
> "Reorder lines between BEGIN and END randomly.
> If BEGIN or END is in the middle of a line, that line is included.
> Any markers inside the region may move
> to the beginning or end of their respective lines,
> and won’t follow the text they were associated with."
> (interactive "*r")
> (save-excursion
> (let ((nlines (count-lines begin end)))
> (goto-char begin)
> (while (> nlines 1)
> (let* ((begin1 (line-beginning-position))
> (line1 (let ((end1 (line-end-position)))
> (prog1 (buffer-substring begin1 end1)
> (delete-region begin1 end1))))
> (_ (forward-line (random nlines)))
> (line2 (let* ((begin2 (line-beginning-position))
> (end2 (line-end-position)))
> (prog1 (buffer-substring begin2 end2)
> (delete-region begin2 end2)))))
> (insert line1)
> (goto-char begin1)
> (insert line2))
> (forward-line)
> (setq nlines (1- nlines))))))
>
> (The structure of let*/let/let* bindings may seem
> excessively complex, but I’m taking care here to not expose
> bindings beyond their validity. E.g. as soon as
> (delete-region begin1 end1) is executed, end1 no longer
> refers to anything meaningful, so I drop that binding asap.)
Alright, that more like it. Scientific randomness at
you service!
Well, yes, `let' within a let body I think I've seen and even
done a couple of times, let inside a let varlist I believe is
a new experience but why not :)
--
underground experts united
https://dataswamp.org/~incal
- avoid narrow-to-region (was: Re: replace-regexp), (continued)
- avoid narrow-to-region (was: Re: replace-regexp), Emanuel Berg, 2021/05/08
- Re: avoid narrow-to-region (was: Re: replace-regexp), Yuri Khan, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Emanuel Berg, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Yuri Khan, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Emanuel Berg, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Jean Louis, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Emanuel Berg, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Yuri Khan, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Emanuel Berg, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Yuri Khan, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp),
Emanuel Berg <=
- Re: avoid narrow-to-region (was: Re: replace-regexp), Emanuel Berg, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Emanuel Berg, 2021/05/09
- Re: avoid narrow-to-region (was: Re: replace-regexp), Emanuel Berg, 2021/05/09
- same sound random sort everywhere (was: Re: avoid narrow-to-region (was: Re: replace-regexp)), Emanuel Berg, 2021/05/21
- Re: same sound random sort everywhere (was: Re: avoid narrow-to-region (was: Re: replace-regexp)), Jean Louis, 2021/05/21
- Re: same sound random sort everywhere (was: Re: avoid narrow-to-region (was: Re: replace-regexp)), Emanuel Berg, 2021/05/21
Re: replace-regexp, Jean Louis, 2021/05/07