diff options
Diffstat (limited to 'guix')
-rw-r--r-- | guix/utils.scm | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/guix/utils.scm b/guix/utils.scm index 345ed374cd..7ebc026702 100644 --- a/guix/utils.scm +++ b/guix/utils.scm @@ -58,7 +58,8 @@ source-properties->location gnu-triplet->nix-system - %current-system)) + %current-system + package-name->name+version)) ;;; @@ -571,6 +572,27 @@ returned by `config.guess'." ;; System type as expected by Nix, usually ARCHITECTURE-KERNEL. (make-parameter (gnu-triplet->nix-system %host-type))) +(define (package-name->name+version name) + "Given NAME, a package name like \"foo-0.9.1b\", return two values: +\"foo\" and \"0.9.1b\". When the version part is unavailable, NAME and +#f are returned. The first hyphen followed by a digit is considered to +introduce the version part." + ;; See also `DrvName' in Nix. + + (define number? + (cut char-set-contains? char-set:digit <>)) + + (let loop ((chars (string->list name)) + (prefix '())) + (match chars + (() + (values name #f)) + ((#\- (? number? n) rest ...) + (values (list->string (reverse prefix)) + (list->string (cons n rest)))) + ((head tail ...) + (loop tail (cons head prefix)))))) + ;;; ;;; Source location. |