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authorLudovic Courtès <ludo@gnu.org>2015-06-17 10:49:29 +0200
committerLudovic Courtès <ludo@gnu.org>2015-06-18 00:25:48 +0200
commit84189ebc66266f03b9ca7e8b912d529886436851 (patch)
treeed8ab7fcbbca66cb2fe876bf48d8f93c89aaf364 /gnu
parent08fa76131e71dc12f5d669480d74e9183008d71a (diff)
downloadguix-84189ebc66266f03b9ca7e8b912d529886436851.tar.gz
guix-84189ebc66266f03b9ca7e8b912d529886436851.zip
Move 'specification->package+output' to (gnu packages).
* guix/scripts/package.scm (specification->package+output): Move to... * gnu/packages.scm (specification->package+output): ... here * guix/scripts/archive.scm (guix): Adjust accordingly.
Diffstat (limited to 'gnu')
-rw-r--r--gnu/packages.scm36
1 files changed, 35 insertions, 1 deletions
diff --git a/gnu/packages.scm b/gnu/packages.scm
index 9eb4877be8..6e46a890bb 100644
--- a/gnu/packages.scm
+++ b/gnu/packages.scm
@@ -51,7 +51,8 @@
check-package-freshness
- specification->package))
+ specification->package
+ specification->package+output))
;;; Commentary:
;;;
@@ -418,3 +419,36 @@ present, return the preferred newest version."
(leave (_ "~A: package not found for version ~a~%")
name version)
(leave (_ "~A: unknown package~%") name))))))
+
+(define* (specification->package+output spec #:optional (output "out"))
+ "Return the package and output specified by SPEC, or #f and #f; SPEC may
+optionally contain a version number and an output name, as in these examples:
+
+ guile
+ guile-2.0.9
+ guile:debug
+ guile-2.0.9:debug
+
+If SPEC does not specify a version number, return the preferred newest
+version; if SPEC does not specify an output, return OUTPUT."
+ (define (ensure-output p sub-drv)
+ (if (member sub-drv (package-outputs p))
+ sub-drv
+ (leave (_ "package `~a' lacks output `~a'~%")
+ (package-full-name p)
+ sub-drv)))
+
+ (let-values (((name version sub-drv)
+ (package-specification->name+version+output spec output)))
+ (match (find-best-packages-by-name name version)
+ ((p)
+ (values p (ensure-output p sub-drv)))
+ ((p p* ...)
+ (warning (_ "ambiguous package specification `~a'~%")
+ spec)
+ (warning (_ "choosing ~a from ~a~%")
+ (package-full-name p)
+ (location->string (package-location p)))
+ (values p (ensure-output p sub-drv)))
+ (()
+ (leave (_ "~a: package not found~%") spec)))))