upstream: Add 'description' field to 'upstream-updater'.

Suggested by Ludovic Courtès <ludo@gnu.org>.

* guix/upstream.scm (<upstream-updater>): Use 'define-record-type*'.
  [description]: New field.
  (lookup-updater): Adjust accordingly.
* guix/gnu-maintenance.scm (%gnu-updater): Likewise.
* guix/import/cran.scm (%cran-updater): Likewise.
* guix/import/elpa.scm (%elpa-updater): Likewise.
* po/guix/POTFILES.in: Add guix/scripts/import/cran.scm and
  guix/gnu-maintenance.scm.

guix/gnu-maintenance.scm

@@ -413,8 +413,10 @@ for instance, whose releases are now uploaded to elpa.gnu.org."
        (gnu-package? package)))
 
 (define %gnu-updater
-  (upstream-updater 'gnu
-                    non-emacs-gnu-package?
-                    latest-release*))
+  (upstream-updater
+   (name 'gnu)
+   (description "Updater for GNU packages")
+   (pred non-emacs-gnu-package?)
+   (latest latest-release*)))
 
 ;;; gnu-maintenance.scm ends here

guix/import/cran.scm

@@ -236,8 +236,10 @@ representation of the package page."
   (string-prefix? "r-" (package-name package)))
 
 (define %cran-updater
-  (upstream-updater 'cran
-                    cran-package?
-                    latest-release))
+  (upstream-updater
+   (name 'cran)
+   (description "Updater for CRAN packages")
+   (pred cran-package?)
+   (latest latest-release)))
 
 ;;; cran.scm ends here

guix/import/elpa.scm

@@ -272,8 +272,10 @@ as \"debbugs\"."
 (define %elpa-updater
   ;; The ELPA updater.  We restrict it to packages hosted on elpa.gnu.org
   ;; because for other repositories, we typically grab the source elsewhere.
-  (upstream-updater 'elpa
-                    package-from-gnu.org?
-                    latest-release))
+  (upstream-updater
+   (name 'elpa)
+   (description "Updater for ELPA packages")
+   (pred package-from-gnu.org?)
+   (latest latest-release)))
 
 ;;; elpa.scm ends here

guix/upstream.scm

@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2010, 2011, 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015 Alex Kost <alezost@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -45,6 +46,7 @@
             upstream-updater
             upstream-updater?
             upstream-updater-name
+            upstream-updater-description
             upstream-updater-predicate
             upstream-updater-latest
 
@@ -109,10 +111,11 @@ correspond to the same version."
 ;;; Auto-update.
 ;;;
 
-(define-record-type <upstream-updater>
-  (upstream-updater name pred latest)
+(define-record-type* <upstream-updater>
+  upstream-updater make-upstream-updater
   upstream-updater?
   (name        upstream-updater-name)
+  (description upstream-updater-description)
   (pred        upstream-updater-predicate)
   (latest      upstream-updater-latest))
 
@@ -120,7 +123,7 @@ correspond to the same version."
   "Return an updater among UPDATERS that matches PACKAGE, or #f if none of
 them matches."
   (any (match-lambda
-         (($ <upstream-updater> _ pred latest)
+         (($ <upstream-updater> _ _ pred latest)
           (and (pred package) latest)))
        updaters))
 

po/guix/POTFILES.in

@@ -12,6 +12,7 @@ guix/scripts/package.scm
 guix/scripts/gc.scm
 guix/scripts/hash.scm
 guix/scripts/import.scm
+guix/scripts/import/cran.scm
 guix/scripts/import/elpa.scm
 guix/scripts/pull.scm
 guix/scripts/substitute.scm
@@ -23,6 +24,7 @@ guix/scripts/edit.scm
 guix/scripts/size.scm
 guix/scripts/graph.scm
 guix/scripts/challenge.scm
+guix/gnu-maintenance.scm
 guix/upstream.scm
 guix/ui.scm
 guix/http-client.scm