diff options
Diffstat (limited to 'gnu/packages.scm')
| -rw-r--r-- | gnu/packages.scm | 28 |
1 files changed, 13 insertions, 15 deletions
diff --git a/gnu/packages.scm b/gnu/packages.scm index 6d128280cc..281d0d297d 100644 --- a/gnu/packages.scm +++ b/gnu/packages.scm @@ -179,22 +179,20 @@ same package twice." vlist-null (all-package-modules)))) -(define* (find-packages-by-name name #:optional version) - "Return the list of packages with the given NAME. If VERSION is not #f, +(define find-packages-by-name + (let ((packages (delay + (fold-packages (lambda (p r) + (vhash-cons (package-name p) p r)) + vlist-null)))) + (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." - (define right-package? - (if version - (lambda (p) - (and (string=? (package-name p) name) - (string=? (package-version p) version))) - (lambda (p) - (string=? (package-name p) name)))) - - (fold-packages (lambda (package result) - (if (right-package? package) - (cons package result) - result)) - '())) + (let ((matching (vhash-fold* cons '() name (force packages)))) + (if version + (filter (lambda (package) + (string=? (package-version package) version)) + matching) + matching))))) (define find-newest-available-packages (memoize |