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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.
This commit is contained in:
Ludovic Courtès 2019-03-28 15:46:18 +01:00
parent e8cfce439a
commit f2bf0407de
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1 changed files with 25 additions and 0 deletions
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gnu/packages.scm
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@ -32,6 +32,7 @@
mkdir-p)) mkdir-p))
#:autoload (guix profiles) (packages->manifest) #:autoload (guix profiles) (packages->manifest)
#:use-module (guix describe) #:use-module (guix describe)
#:use-module (guix deprecation)
#:use-module (ice-9 vlist) #:use-module (ice-9 vlist)
#:use-module (ice-9 match) #:use-module (ice-9 match)
#:autoload (ice-9 binary-ports) (put-bytevector) #:autoload (ice-9 binary-ports) (put-bytevector)
@ -55,6 +56,7 @@
fold-packages fold-packages
fold-available-packages fold-available-packages
find-newest-available-packages
find-packages-by-name find-packages-by-name
find-package-locations find-package-locations
find-best-packages-by-name find-best-packages-by-name
@ -186,6 +188,29 @@ flags."
directory)) directory))
%load-path))) %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) (define (fold-available-packages proc init)
"Fold PROC over the list of available packages. For each available package, "Fold PROC over the list of available packages. For each available package,
PROC is called along these lines: PROC is called along these lines: