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Re: Cleaning up and structuring user-emacs-directory

From: Stefan Monnier
Subject: Re: Cleaning up and structuring user-emacs-directory
Date: Sun, 23 Aug 2020 11:15:48 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

> The doc string of ecomplete-database-file suggests that the file is
> really a kind of cache.  Is that so?

Not exactly, it's more like a history (of email addresses we've bumped into).

> Would deleting the file be harmless?

It doesn't contain data the user painstakingly created, but deleting it
would cause the suggested completions to be much less useful for a while.

So it's somewhat like a cache, except that a cache is expected to affect
only the performance but not the actual behavior.

> I have a feeling that recentf-save-file is also a cache file.  Is that so?

Same: it's a history (of files we visited).

> We should take care to distinguish which files are cache files
> and put them into ~/.cache.

Agreed.  I think package.el's `archive-contents` file do qualify as
caches, as do the <pkg>-readme.txt files.


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