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Re: package.el dependencies

From: Artur Malabarba
Subject: Re: package.el dependencies
Date: Fri, 23 Jan 2015 22:50:12 -0200

> The problem is we need to feed an alist of packages explicitely
> installed with their dependencies, so of course all packages installed
> prior this change will have to be reinstalled.
> The alist would looks like this:
> (setq packages-installed-explicitely
>       '((foo . (a b c d h))
>         (bar . (b d e))
>         (baz . (e f g))))
> where a b c... are dependencies.

I don't think we need an alist for that. Simply marking which packages
were installed explicitly in a plain list should be enough. The
dependency information is already available in `package-alist`,
there's no need to replicate it in this other variable. (In fact,
maybe the "instaleed explicitly" flag could be stored in
`package-alist' too, instead of its own list.)

Thus, when `foo' is removed, we loop through it's depedencies and
remove each package which is neither `installed-explicitly' nor the
dependency of something else.

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