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bug#55879: 29.0.50; Missing ALL argument in find-sibling-file


From: Juri Linkov
Subject: bug#55879: 29.0.50; Missing ALL argument in find-sibling-file
Date: Fri, 10 Jun 2022 10:55:28 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (x86_64-pc-linux-gnu)

>> Also, the Info documentation could reference ff-find-related-file when
>> it gives the example of going from the source file to the header file in
>> C files.
>
> I still think we should have extended ff-find-related-file instead of
> introducing a completely new facility with an incompatible UI.

I started to use find-sibling-file and noticed that it's quite powerful
despite its simplicity.  For example, with such configuration:

dir1/.dir-locals-2.el:
  ((nil . ((find-sibling-rules . (("src/[^/]+/\\(.*\\)\\'"
                                   "src/dir2/\\1\\'"))))))
dir2/.dir-locals-2.el:
  ((nil . ((find-sibling-rules . (("src/[^/]+/\\(.*\\)\\'"
                                   "src/dir3/\\1\\'"))))))
dir3/.dir-locals-2.el:
  ((nil . ((find-sibling-rules . (("src/[^/]+/\\(.*\\)\\'"
                                   "src/dir1/\\1\\'"))))))

it allows cycling between sibling files of three source trees
in the predefined order.

Can ff-find-related-file do the same?





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