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authorLudovic Courtès <ludo@gnu.org>2015-04-18 22:30:07 +0200
committerLudovic Courtès <ludo@gnu.org>2015-04-18 22:57:52 +0200
commit724311a26b5205dd5721439389ab70aab4082371 (patch)
treeed008a2e9b709cb74b3973efbaace6d984b8333c /gnu/packages.scm
parente7bf0e446553d928b2adef84a70f274f242b1b88 (diff)
downloadgnu-guix-724311a26b5205dd5721439389ab70aab4082371.tar
gnu-guix-724311a26b5205dd5721439389ab70aab4082371.tar.gz
packages: Allow package lookups with version prefixes.
* gnu/packages.scm (find-packages-by-name): Sort MATCHING according to 'version>?'. Use 'string-prefix?' instead of 'string=?' to compare against VERSION. * doc/guix.texi (Invoking guix package): Add example and explanation.
Diffstat (limited to 'gnu/packages.scm')
-rw-r--r--gnu/packages.scm12
1 files changed, 8 insertions, 4 deletions
diff --git a/gnu/packages.scm b/gnu/packages.scm
index 6ef0fb6de7..9eb4877be8 100644
--- a/gnu/packages.scm
+++ b/gnu/packages.scm
@@ -211,14 +211,18 @@ same package twice."
(let ((packages (delay
(fold-packages (lambda (p r)
(vhash-cons (package-name p) p r))
- vlist-null))))
+ vlist-null)))
+ (version>? (lambda (p1 p2)
+ (version>? (package-version p1) (package-version p2)))))
(lambda* (name #:optional version)
"Return the list of packages with the given NAME. If VERSION is not #f,
-then only return packages whose version is equal to VERSION."
- (let ((matching (vhash-fold* cons '() name (force packages))))
+then only return packages whose version is prefixed by VERSION, sorted in
+decreasing version order."
+ (let ((matching (sort (vhash-fold* cons '() name (force packages))
+ version>?)))
(if version
(filter (lambda (package)
- (string=? (package-version package) version))
+ (string-prefix? version (package-version package)))
matching)
matching)))))