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From: Christopher Dimech <dimech@gmx.com>
To: Phil Sainty <psainty@orcon.net.nz>
Cc: 57481@debbugs.gnu.org
Subject: bug#57481: elisp code utilising derived-mode-parent
Date: Wed, 31 Aug 2022 13:31:15 +0200	[thread overview]
Message-ID: <trinity-4fce17ca-5057-4af6-beac-5a38f89293ad-1661945475404@3c-app-mailcom-bs01> (raw)
In-Reply-To: <fbf558ae2cfa79fb8765a55f06c50d67@webmail.orcon.net.nz>

> Sent: Tuesday, August 30, 2022 at 6:37 PM
> From: "Phil Sainty" <psainty@orcon.net.nz>
> To: "Christopher Dimech" <dimech@gmx.com>
> Cc: 57481@debbugs.gnu.org
> Subject: Re: bug#57481: elisp code utilising derived-mode-parent
>
> You can derive (as it were) such a function from the code of
> `provided-mode-derived-p' like so:
>
>
>   (defun derived-mode-chain (mode)
>     "Return the chain of derived modes for MODE."
>     (let (chain)
>       (while (progn (push mode chain)
>                     (let* ((parent (get mode 'derived-mode-parent))
>                            (parentfn (symbol-function parent)))
>                       (setq mode (if (and parentfn (symbolp parentfn))
>                                      parentfn
>                                    parent)))))
>       (nreverse chain)))
>
>
>   (derived-mode-chain 'latex-mode)
>   => (latex-mode tex-mode text-mode)
>

Have not encountered "(while" with "(progn" in "(while (progn".  Could you be so kind to explain it?





  parent reply	other threads:[~2022-08-31 11:31 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-30  5:44 bug#57481: elisp code utilising derived-mode-parent Christopher Dimech
2022-08-30  6:37 ` Phil Sainty
2022-08-30 11:33   ` Christopher Dimech
2022-08-30 12:02     ` Phil Sainty
2022-08-30 12:08   ` Christopher Dimech
2022-08-30 12:38     ` Phil Sainty
2022-08-30 12:46       ` Christopher Dimech
2022-08-30 13:02       ` Eli Zaretskii
2022-08-30 13:16         ` Christopher Dimech
2022-08-30 22:07           ` Phil Sainty
2022-08-31  6:24             ` Christopher Dimech
2022-08-31 11:31   ` Christopher Dimech [this message]
2022-08-30 10:36 ` Lars Ingebrigtsen
2022-08-30 11:48   ` Christopher Dimech

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