From bedba064267490f2d9f7ee44e5ec103aacc82611 Mon Sep 17 00:00:00 2001
From: Mark H Weaver <mhw@netris.org>
Date: Tue, 2 May 2017 03:39:23 -0400
Subject: [PATCH] Add package/inherit.
* guix/packages.scm (package/inherit): New public macro.
---
guix/packages.scm | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/guix/packages.scm b/guix/packages.scm
index 44f2c32fb7d..8ead950739e 100644
--- a/guix/packages.scm
+++ b/guix/packages.scm
@@ -1,6 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
-;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2014, 2015, 2017 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2015 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2016 Alex Kost <alezost@gmail.com>
;;;
@@ -105,6 +105,7 @@ (define-module (guix packages)
package-cross-derivation
package-output
package-grafts
+ package/inherit
transitive-input-references
@@ -789,6 +790,16 @@ (define (rewrite p)
(package-mapping rewrite (cut assq <> replacements)))
+(define-syntax-rule (package/inherit p overrides ...)
+ "Like (package (inherit P) OVERRIDES ...), except that the same
+transformation is done to the package replacement, if any. P must be a bare
+identifier, and will be bound to either P or its replacement when evaluating
+OVERRIDES."
+ (let loop ((p p))
+ (package (inherit p)
+ overrides ...
+ (replacement (and=> (package-replacement p) loop)))))
+
;;;
;;; Package derivations.
--
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