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Re: Subprojects in project.el

From: Dmitry Gutov
Subject: Re: Subprojects in project.el
Date: Sat, 26 Nov 2022 04:07:57 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2

On 26/11/22 02:46, João Távora wrote:
Dmitry Gutov<dgutov@yandex.ru>  writes:

On 26/11/22 01:47, João Távora wrote:
You can use dir-locals-set-class-variables to variable like the
hypothetical project-subproject-prefixes to the super-project's root.
This contains a list of strings or regexps that identify the subprojects
inside the superproject.  I don't see the problem.  Elements in
project-find-functions would be aware of this value and proceed
accordingly to find the subprojects.
I don't see the problem in that.

I just fail to see an advantage either, given that the list of
prefixes would be different between the "super" projects, so the
suggestion to use a class is perplexing.
The point of dir-locals-set-class-variables is to set directly-locals
"from a distance" when creating an actual .dir-locals.el file isn't
feasible or desired.

   (dir-locals-set-directory-class "~/Source/very-big-project" 
   (dir-locals-set-class-variables 'very-big-project ((nil . (project-find-prefixes "foo" 

Even if it's a one-use class, there's nothing wrong with that IMO. And
chances are you have multiple clones or Git worktrees of the same
project, so you may as well make it a two- or three-use class

   (dir-locals-set-directory-class "~/Source/worktree-2" 'very-big-project)
   (dir-locals-set-directory-class "~/Source/another-clone" 'very-big-project)

Of course if the user is able to AND wants to use .dir-locals.el or
marker files, that is fine, too.  I personally like the above scheme.

We don't have the -prefixes variable (and Stefan asked for a way to tag a project root, probably even without any VC repository around), but as a replacement for .dir-locals.el -- cool, good recommendation.

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