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packages: Reintroduce 'find-newest-available-packages'.

This is a followup to e2a903c807.

* gnu/packages.scm (find-newest-available-packages): New procedure.
version-1.0.0
Ludovic Courtès 3 years ago
parent
commit
f2bf0407de
No known key found for this signature in database GPG Key ID: 90B11993D9AEBB5
  1. 25
      gnu/packages.scm

25
gnu/packages.scm

@ -32,6 +32,7 @@
mkdir-p))
#:autoload (guix profiles) (packages->manifest)
#:use-module (guix describe)
#:use-module (guix deprecation)
#:use-module (ice-9 vlist)
#:use-module (ice-9 match)
#:autoload (ice-9 binary-ports) (put-bytevector)
@ -55,6 +56,7 @@
fold-packages
fold-available-packages
find-newest-available-packages
find-packages-by-name
find-package-locations
find-best-packages-by-name
@ -186,6 +188,29 @@ flags."
directory))
%load-path)))
;; This procedure is used by Emacs-Guix up to 0.5.1.1, so keep it for now.
;; See <https://github.com/alezost/guix.el/issues/30>.
(define-deprecated find-newest-available-packages
find-packages-by-name
(mlambda ()
"Return a vhash keyed by package names, and with
associated values of the form
(newest-version newest-package ...)
where the preferred package is listed first."
(fold-packages (lambda (p r)
(let ((name (package-name p))
(version (package-version p)))
(match (vhash-assoc name r)
((_ newest-so-far . pkgs)
(case (version-compare version newest-so-far)
((>) (vhash-cons name `(,version ,p) r))
((=) (vhash-cons name `(,version ,p ,@pkgs) r))
((<) r)))
(#f (vhash-cons name `(,version ,p) r)))))
vlist-null)))
(define (fold-available-packages proc init)
"Fold PROC over the list of available packages. For each available package,
PROC is called along these lines:

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