Subject: bug#47493: 27.1; auto-save-file-name-transforms with uniquify should not create invalid filenames

From: Glenn Morris <[email-masked]>
Date: Tue, 06 Apr 2021 16:57:54 -0400

Michael Albinus wrote:

> Nobody has commented. 

You asked for an example of why this was needed; I was waiting to hear
the answer.

> + If the optional element UNIQUIFY is a symbol returned by function
> + `secure-hash-algorithms', the auto-save file name is constructed
> + by taking the directory part of the replaced file-name,
> + concatenated with the buffer file name run through `secure-hash'
> + instead.  This returns a valid name for your filesystem any way.

Grammar tweaks:

If UNIQUIFY is one of the members of `secure-hash-algorithms',
Emacs constructs the nondirectory part of the auto-save file name by
applying that `secure-hash' to the buffer file name. This avoids any
risk of excessively long file names.