From 6715e1ff2e09af3208f8f2a108ca100798ca1058 Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Fri, 27 Jan 2017 23:40:04 +0100
Subject: gnu-maintenance: 'gnu-package?' ignores invalid URLs.

* guix/gnu-maintenance.scm (gnu-package?)[gnu-home-page?]: Add '>>'
threading macro and use it.
---
 guix/gnu-maintenance.scm | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/guix/gnu-maintenance.scm b/guix/gnu-maintenance.scm
index 8a37ce56e6..9c94992ab6 100644
--- a/guix/gnu-maintenance.scm
+++ b/guix/gnu-maintenance.scm
@@ -187,11 +187,17 @@ network to check in GNU's database."
                   'non-gnu)))))
 
        (define (gnu-home-page? package)
-         (and=> (package-home-page package)
-                (lambda (url)
-                  (and=> (uri-host (string->uri url))
-                         (lambda (host)
-                           (member host '("www.gnu.org" "gnu.org")))))))
+         (letrec-syntax ((>> (syntax-rules ()
+                               ((_ value proc)
+                                (and=> value proc))
+                               ((_ value proc rest ...)
+                                (and=> value
+                                       (lambda (next)
+                                         (>> (proc next) rest ...)))))))
+           (>> package package-home-page
+               string->uri uri-host
+               (lambda (host)
+                 (member host '("www.gnu.org" "gnu.org"))))))
 
        (or (gnu-home-page? package)
            (let ((url  (and=> (package-source package) origin-uri))
-- 
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