From: Samuel Wales <samologist@gmail.com>
To: "João Pedro de Amorim Paula" <jpedrodeamorim@gmail.com>
Cc: Tim Cross <theophilusx@gmail.com>, emacs-orgmode@gnu.org
Subject: Re: Suggestion: convert dispatchers to use transient
Date: Sat, 5 Feb 2022 18:49:00 -0700 [thread overview]
Message-ID: <CAJcAo8vDb2gXV-i4te7pn0LYk8XrR2zD-MyBpG+-iyqXNCmv0g@mail.gmail.com> (raw)
In-Reply-To: <87iltt6p94.fsf@gmail.com>
jus want to state the obvious here in case it is useful [but everybody
probbly lready knows] --- not everybody uses packages or maybe trusts
them has internet etc.
On 2/5/22, João Pedro de Amorim Paula <jpedrodeamorim@gmail.com> wrote:
> On 04 February 2022 08:30, Tim Cross <theophilusx@gmail.com> wrote:
>
>> I'm assuming it is, but I have to admit I'm still not 100% clear on
>> how Emacs handles the situation where you use a library that is both
>> built-in and available in ELPA. Does Emacs use the latest version
>> available or does it use the built-in version until you explicitly
>> select the ELPA versions?
>
> Welp, I happened to ponder the same question after trying to implement a
> function to install packages that are not installed already (I'm not
> using any helper configuration such as use-package, which would already
> handle this). From what I gathered empirically, it appears that if
> something is built-in, Emacs' package.el won't try to install -- it
> checks with package-installed-p on any call to package-install, which
> checks if the package is built-in with package-built-in-p as a fallback
> on cond --, but you can force installation from the archives by passing
> a package description object (defined as package-desc on package.el)
> instead of a symbol
>
> (let ((pkg-desc (assq 'org package-archive-contents)))
> (package-install pkg-desc))
>
> and Emacs seems to be loading the newest version when it is a dependency
> of something else. Though I'm not really sure, as most of the packages I
> have from ELPA have the same version as the ones built-in on Emacs
> 28.0.91. I'll try and install Emacs 27 to check this out.
>
> In the mean time, I guess this would be a good opportunity to share a
> couple of functions I have with the purpose of installing packages.
>
> (defun pkg-description (package)
> "Return the description for PACKAGE.
> If PACKAGE is installed, the will be present on `package-alist',
> otherwise look for it in `package-archive-contents'."
> (or (cadr (assoc package package-alist))
> (cadr (assoc package package-archive-contents))))
>
> (defun pkg-ensure-archive (package)
> "Install PACKAGE from the archives, if not already installed."
> (when-let ((pkg-desc (pkg-description package)))
> (unless (package-installed-p pkg-desc)
> (package-install-from-archive pkg-desc))))
>
> (defun require-package (package &optional force)
> "Ensure that PACKAGE is installed.
> If FORCE is non-nil, force installation regardless if PACKAGE is
> built-in or not.
>
> First, use `package-installed-p' to check if PACKAGE was
> installed via the Emacs package manager, otherwise, try to
> `require' PACKAGE; this ensures that we don't require PACKAGE if
> it was installed using the package manager. If both of those
> fail, run `package-refresh-contents' and install PACKAGE."
> (unless (and (not force)
> (or (package-installed-p package)
> (require package nil 'no-error)))
> (unless (assoc package package-archive-contents)
> (package-refresh-contents))
> (if force
> (pkg-ensure-archive package)
> (package-install package))))
>
> On the last one, the main function that I use, if FORCE is non-nil it
> will download and install the package from the archives even if it is
> built-in.
>
> Best regards,
>
> --
> João Pedro de Amorim Paula
> IT undergraduate at Universidade Federal do Rio Grande do Norte (UFRN)
>
--
The Kafka Pandemic
A blog about science, health, human rights, and misopathy:
https://thekafkapandemic.blogspot.com
next prev parent reply other threads:[~2022-02-06 1:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-02 11:59 Suggestion: convert dispatchers to use transient Hugo Heagren
2022-02-03 8:54 ` Tom Gillespie
2022-02-03 10:07 ` Tim Cross
2022-02-03 17:51 ` Jim Porter
2022-02-03 21:30 ` Tim Cross
2022-02-04 1:13 ` Jim Porter
2022-02-04 5:37 ` Christopher M. Miles
2022-02-05 20:18 ` João Pedro de Amorim Paula
2022-02-06 1:49 ` Samuel Wales [this message]
2022-02-06 3:28 ` João Pedro de Amorim Paula
2022-02-07 15:37 ` Anders Johansson
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